/* ==========================================================================
   SwapNest Design System
   Premium peer-to-peer marketplace — pure CSS, mobile-first
   ========================================================================== */

/* --------------------------------------------------------------------------
   Shared Design Tokens (theme-independent)
   -------------------------------------------------------------------------- */
:root {
  --header-height: 4rem;
  --container-max: 75rem;
  --sidebar-width: 16rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px var(--color-shadow);
  --shadow-md: 0 4px 12px var(--color-shadow);
  --shadow-lg: 0 8px 24px var(--color-shadow-strong);
  --shadow-xl: 0 16px 48px var(--color-shadow-strong);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  --font-family: "Inter", system-ui, -apple-system, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --line-height-tight: 1.25;
  --line-height-base: 1.5;
  --line-height-relaxed: 1.625;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  --z-dropdown: 100;
  --z-header: 200;
  --z-modal: 300;
  --z-fab: 150;
  --z-flash: 250;
}

/* --------------------------------------------------------------------------
   Design Tokens — Light Theme
   -------------------------------------------------------------------------- */
[data-theme="light"] {
  color-scheme: light;
  --color-primary: #5B7C99;
  --color-primary-hover: #4A6680;
  --color-primary-light: #EEF3F7;
  --color-secondary: #5C6370;
  --color-secondary-hover: #4A5059;

  --color-bg: #fafafa;
  --color-bg-alt: #f4f6f8;
  --color-surface: #ffffff;
  --color-surface-hover: #f9fafb;
  --color-surface-elevated: #ffffff;
  --color-border: #e4e4e7;
  --color-border-light: #f4f4f5;

  --color-text: #18181b;
  --color-text-secondary: #52525b;
  --color-text-muted: #a1a1aa;
  --color-text-inverse: #ffffff;

  --color-success: #10b981;
  --color-success-bg: #ecfdf5;
  --color-error: #ef4444;
  --color-error-bg: #fef2f2;
  --color-warning: #f59e0b;
  --color-warning-bg: #fffbeb;
  --color-info: #3b82f6;
  --color-info-bg: #eff6ff;

  --color-glass-bg: rgba(255, 255, 255, 0.72);
  --color-glass-border: rgba(255, 255, 255, 0.5);
  --color-overlay: rgba(0, 0, 0, 0.45);
  --color-shadow: rgba(0, 0, 0, 0.08);
  --color-shadow-strong: rgba(0, 0, 0, 0.14);

  --gradient-primary: linear-gradient(135deg, #6B8CAE 0%, #4A6680 100%);
  --gradient-hero: linear-gradient(135deg, #EEF3F7 0%, #f4f6f8 50%, #fafafa 100%);
  --gradient-text: linear-gradient(135deg, #6B8CAE, #4A6680);
}

/* --------------------------------------------------------------------------
   Design Tokens — Dark Theme
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  color-scheme: dark;
  --color-primary: #8BA4BC;
  --color-primary-hover: #A8BFD4;
  --color-primary-light: rgba(139, 164, 188, 0.15);
  --color-secondary: #9CA3AF;
  --color-secondary-hover: #6B7280;

  --color-bg: #09090b;
  --color-bg-alt: #141f33;
  --color-surface: #18181b;
  --color-surface-hover: #27272a;
  --color-surface-elevated: #27272a;
  --color-border: #3f3f46;
  --color-border-light: #27272a;

  --color-text: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-text-inverse: #18181b;

  --color-success: #34d399;
  --color-success-bg: rgba(16, 185, 129, 0.12);
  --color-error: #f87171;
  --color-error-bg: rgba(239, 68, 68, 0.12);
  --color-warning: #fbbf24;
  --color-warning-bg: rgba(245, 158, 11, 0.12);
  --color-info: #60a5fa;
  --color-info-bg: rgba(59, 130, 246, 0.12);

  --color-glass-bg: rgba(20, 31, 51, 0.82);
  --color-glass-border: rgba(139, 164, 188, 0.2);
  --color-overlay: rgba(0, 0, 0, 0.65);
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-shadow-strong: rgba(0, 0, 0, 0.5);

  --gradient-primary: linear-gradient(135deg, #8BA4BC 0%, #6B8CAE 100%);
  --gradient-hero: linear-gradient(135deg, #0f1729 0%, #1a2744 50%, #09090b 100%);
  --gradient-text: linear-gradient(135deg, #A8C0D6, #8BA4BC);
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
video,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
}

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  font-weight: 700;
  color: var(--color-text);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

ul, ol { list-style: none; }

hr {
  border: none;
  border-top: 1px solid var(--color-border);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

::selection {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.main-content {
  min-height: calc(100dvh - var(--header-height) - 12rem);
  padding-block: var(--space-6);
}

.page-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-8);
  margin-bottom: var(--space-8);
}

.page-header h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-2);
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-muted {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.prose {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.prose p + p {
  margin-top: var(--space-4);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes animate-in {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(0.5rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes pulse-soft {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-in {
  animation: animate-in 0.6s ease both;
}

.animate-in--delay-1 { animation-delay: 0.1s; }
.animate-in--delay-2 { animation-delay: 0.2s; }
.animate-in--delay-3 { animation-delay: 0.3s; }

[data-animate] {
  opacity: 0;
  transform: translateY(0.75rem);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-animate] {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  white-space: nowrap;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--gradient-primary);
  color: var(--color-text-inverse);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.btn--primary:hover {
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
  color: var(--color-text-inverse);
}

.btn--outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.btn--white {
  background: #ffffff;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.btn--white:hover {
  background: #f4f4f5;
  color: var(--color-primary-hover);
}

.btn--sm {
  padding: 0.4375rem 0.875rem;
  font-size: var(--font-size-xs);
}

.btn--lg {
  padding: 0.875rem 1.75rem;
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
}

.btn--full {
  width: 100%;
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
.form-group {
  margin-bottom: var(--space-5);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-group input,
.form-group select,
.form-group textarea,
.filters-form input,
.filters-form select,
.chat-input input[type="text"],
.chat-input textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus,
.filters-form input:focus,
.filters-form select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

.form-group textarea {
  resize: vertical;
  min-height: 6rem;
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.form-row--2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-row--3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.form-link {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-primary);
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.input-otp {
  text-align: center;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: 0.5em;
  font-variant-numeric: tabular-nums;
}

.form-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.form-section h2 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-light);
}

.form-page {
  max-width: 42rem;
  padding-bottom: var(--space-12);
}

.listing-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  background: var(--color-bg-alt);
  transition: border-color var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
}

.upload-zone:hover,
.upload-zone.is-dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.upload-zone__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-secondary);
}

.upload-zone__content svg {
  color: var(--color-text-muted);
}

.upload-link {
  color: var(--color-primary);
  font-weight: 600;
  cursor: pointer;
}

.upload-link:hover {
  text-decoration: underline;
}

.upload-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.upload-preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(5rem, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

/* --------------------------------------------------------------------------
   Header — Glassmorphism
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: var(--color-glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-glass-border);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  flex-shrink: 0;
  line-height: 1.1;
  text-decoration: none;
}

.header__logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  flex-shrink: 0;
  border-radius: 50%;
  overflow: hidden;
  background: transparent;
  box-shadow: 0 0 0 1px rgba(139, 164, 188, 0.35);
}

.header__logo-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.header__logo-wordmark {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  min-width: 0;
}

.header__logo-text {
  font-weight: 800;
  font-size: var(--font-size-lg);
  letter-spacing: -0.03em;
  white-space: nowrap;
}

.header__logo-tagline {
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  line-height: 1;
  white-space: nowrap;
}

.header__logo:hover {
  color: var(--color-text);
}

.header__logo:hover .header__logo-text {
  color: var(--color-primary);
}

@media (max-width: 480px) {
  .header__logo-tagline {
    display: none;
  }

  .header__logo-mark {
    width: 2.125rem;
    height: 2.125rem;
  }
}

/* Skip link — hidden until keyboard focus */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.header__search {
  position: relative;
  flex: 1;
  max-width: 28rem;
  display: none;
}

.header__search-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.header__search-input {
  width: 100%;
  padding: 0.5rem 0.875rem 0.5rem 2.5rem;
  font-size: var(--font-size-sm);
  background: var(--color-bg-alt);
  border: 1.5px solid transparent;
  border-radius: var(--radius-full);
  color: var(--color-text);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.header__search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
}

.search-suggestions {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: var(--z-dropdown);
  animation: slide-up 0.2s ease;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.header__nav-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  position: relative;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.header__nav-link:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.header__nav-link--badge .badge {
  position: absolute;
  top: 0.125rem;
  right: 0.125rem;
  min-width: 1.125rem;
  height: 1.125rem;
  padding: 0 0.25rem;
  font-size: 0.625rem;
  font-weight: 700;
  line-height: 1.125rem;
  text-align: center;
  background: var(--color-error);
  color: #fff;
  border-radius: var(--radius-full);
}

.header__user-menu {
  position: relative;
}

.header__avatar-btn {
  display: flex;
  border-radius: var(--radius-full);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.header__avatar-btn:hover {
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.header__avatar {
  border-radius: var(--radius-full);
  object-fit: cover;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  min-width: 12rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  z-index: var(--z-dropdown);
  animation: scale-in 0.15s ease;
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  text-align: left;
  transition: background var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.dropdown-item--danger {
  color: var(--color-error);
}

.dropdown-item--danger:hover {
  background: var(--color-error-bg);
}

.dropdown-divider {
  margin: var(--space-2) 0;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

.header__mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  color: var(--color-text);
}

.header__mobile-toggle:hover {
  background: var(--color-surface-hover);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12) var(--space-6);
  margin-top: var(--space-12);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.footer__logo:hover {
  color: var(--color-text);
}

.footer__logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(139, 164, 188, 0.35);
}

.footer__logo-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.footer__tagline {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  max-width: 20rem;
}

.footer__links h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footer__links a {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding-block: var(--space-1);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer__bottom p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: var(--space-20) var(--space-12);
  overflow: hidden;
  min-height: 28rem;
}

.hero--image {
  color: #fff;
}

.hero--image .hero__title,
.hero--image .hero__stat strong {
  color: #fff;
}

.hero--image .hero__subtitle,
.hero--image .hero__stat span {
  color: rgba(255, 255, 255, 0.85);
}

.hero--image .text-gradient {
  background: linear-gradient(135deg, #A8C0D6, #8BA4BC);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(9, 9, 11, 0.55) 0%, rgba(9, 9, 11, 0.75) 100%);
  z-index: 0;
}

.hero--image .hero__overlay {
  display: block;
}

.hero:not(.hero--image) .hero__overlay {
  display: none;
}

.hero__eyebrow {
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-3);
}

.hero__bg::after {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 120%;
  background: radial-gradient(ellipse, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 32rem;
  margin-inline: auto;
  margin-bottom: var(--space-8);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-bottom: var(--space-10);
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-8);
}

.hero__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}

.hero__stat strong {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-text);
}

.hero__stat span {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */
.section {
  padding-block: var(--space-10);
}

.section--alt {
  background: var(--color-bg-alt);
}

.section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
}

.section__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
}

.section__link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.section__link:hover {
  color: var(--color-primary-hover);
}

/* --------------------------------------------------------------------------
   Category Grid
   -------------------------------------------------------------------------- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  text-align: center;
  color: var(--color-text);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.category-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}

.category-card__icon {
  font-size: var(--font-size-3xl);
  line-height: 1;
}

.category-card__name {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.category-card__count {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Listing Cards & Grid
   -------------------------------------------------------------------------- */
.listing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.listing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.listing-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.listing-card__link {
  display: block;
  color: inherit;
}

.listing-card__link:hover {
  color: inherit;
}

.listing-card__image-wrap {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.listing-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.listing-card:hover .listing-card__image {
  transform: scale(1.04);
}

.listing-card__badge {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  padding: 0.125rem 0.5rem;
  font-size: var(--font-size-xs);
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.listing-card__badge--boost {
  background: var(--gradient-primary);
  color: #fff;
}

.listing-card__badge--sale {
  background: var(--color-error);
  color: #fff;
  top: auto;
  bottom: var(--space-2);
}

.listing-card__wishlist {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--transition-fast), transform var(--transition-fast), color var(--transition-fast);
}

.listing-card:hover .listing-card__wishlist {
  opacity: 1;
  transform: scale(1);
}

.listing-card__wishlist:hover,
.listing-card__wishlist.is-active {
  color: var(--color-error);
}

.listing-card__body {
  padding: var(--space-3) var(--space-4) var(--space-4);
}

.listing-card__title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.listing-card__meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.listing-card__price {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text);
}

.listing-card__original-price {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-decoration: line-through;
}

.listing-card__size {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-left: auto;
}

.listing-card__seller {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.listing-card__seller-avatar {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: var(--radius-full);
  object-fit: cover;
}

.verified-badge {
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Seller Cards
   -------------------------------------------------------------------------- */
.seller-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.seller-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.seller-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}

.seller-card__avatar {
  border-radius: var(--radius-full);
  object-fit: cover;
  flex-shrink: 0;
}

.seller-card__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.seller-card__name {
  font-weight: 600;
  font-size: var(--font-size-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.seller-card__rating {
  font-size: var(--font-size-xs);
  color: var(--color-warning);
}

.seller-card__count {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   CTA Section
   -------------------------------------------------------------------------- */
.cta-section {
  background: var(--gradient-primary);
  padding-block: var(--space-12);
  margin-top: var(--space-4);
}

.cta-section__inner {
  text-align: center;
  color: #fff;
}

.cta-section__inner h2 {
  color: #fff;
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-3);
}

.cta-section__inner p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  margin-bottom: var(--space-6);
  max-width: 32rem;
  margin-inline: auto;
}

/* --------------------------------------------------------------------------
   Auth Pages
   -------------------------------------------------------------------------- */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100dvh - var(--header-height) - 8rem);
  padding: var(--space-6);
}

.auth-card {
  width: 100%;
  max-width: 26rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
}

.auth-card__header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.auth-card__header h1 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-2);
}

.auth-card__header p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.auth-card__footer {
  text-align: center;
  margin-top: var(--space-6);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.auth-form .btn {
  margin-top: var(--space-2);
}

/* --------------------------------------------------------------------------
   Search Page
   -------------------------------------------------------------------------- */
.search-page {
  padding-bottom: var(--space-12);
}

.search-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.search-filters {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.search-filters h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-5);
}

.filters-form .form-group:last-of-type {
  margin-bottom: var(--space-6);
}

.search-results__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.search-results__header h1 {
  font-size: var(--font-size-xl);
}

.search-results__count {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Listing Detail
   -------------------------------------------------------------------------- */
.listing-detail {
  padding-bottom: var(--space-12);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.listing-detail__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.listing-gallery__main {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-alt);
}

.listing-gallery__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.listing-gallery__boost {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-3);
  background: var(--gradient-primary);
  color: #fff;
  font-size: var(--font-size-xs);
  font-weight: 700;
  border-radius: var(--radius-full);
}

.listing-gallery__thumbs {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
  overflow-x: auto;
}

.listing-gallery__thumb {
  flex-shrink: 0;
  width: 4rem;
  height: 4rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid transparent;
  opacity: 0.6;
  transition: opacity var(--transition-fast), border-color var(--transition-fast);
}

.listing-gallery__thumb.active,
.listing-gallery__thumb:hover {
  opacity: 1;
  border-color: var(--color-primary);
}

.listing-gallery__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.listing-gallery__video {
  margin-top: var(--space-4);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.listing-video {
  width: 100%;
  border-radius: var(--radius-xl);
}

.listing-info__title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-4);
}

.listing-info__price-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.listing-info__price {
  font-size: var(--font-size-3xl);
  font-weight: 800;
}

.listing-info__negotiable {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-success);
  background: var(--color-success-bg);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
}

.listing-info__original {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  text-decoration: line-through;
}

.listing-info__details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-5);
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.detail-item span {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.detail-item strong {
  font-size: var(--font-size-sm);
}

.listing-seller {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-5);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}

.listing-seller:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
}

.listing-seller__avatar {
  border-radius: var(--radius-full);
  object-fit: cover;
}

.listing-seller__name {
  display: block;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.listing-seller__rating {
  font-size: var(--font-size-xs);
  color: var(--color-warning);
}

.listing-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.listing-info__description h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
}

/* Trade modal items */
.trade-items-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  max-height: 16rem;
  overflow-y: auto;
}

.trade-item-select {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: border-color var(--transition-fast);
}

.trade-item-select:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.trade-item-select input {
  accent-color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Profile
   -------------------------------------------------------------------------- */
.profile-page {
  padding-bottom: var(--space-12);
}

.profile-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-8);
  margin-bottom: var(--space-8);
}

.profile-header__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-4);
}

.profile-header__avatar {
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 3px solid var(--color-border);
}

.profile-header__username {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.profile-header__bio {
  color: var(--color-text-secondary);
  max-width: 28rem;
  margin-top: var(--space-2);
}

.profile-header__location {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.profile-header__stats {
  display: flex;
  gap: var(--space-6);
  margin-top: var(--space-4);
  font-size: var(--font-size-sm);
}

.profile-header__stats span {
  color: var(--color-text-muted);
}

.profile-header__stats strong {
  color: var(--color-text);
}

.profile-header__actions {
  margin-top: var(--space-4);
}

.reviews-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.review-card {
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.review-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
}

.review-card__stars {
  color: var(--color-warning);
}

.review-card__date {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

/* --------------------------------------------------------------------------
   Settings
   -------------------------------------------------------------------------- */
.settings-page {
  padding-bottom: var(--space-12);
}

.settings-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.settings-nav {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: var(--space-2);
}

.settings-nav a {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.settings-nav a:hover,
.settings-nav a.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.settings-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
  display: none;
}

.settings-section--active {
  display: block;
}

.settings-section__desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
  font-size: var(--font-size-sm);
}

.settings-checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.settings-section h2 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-5);
}

/* --------------------------------------------------------------------------
   Messages & Chat
   -------------------------------------------------------------------------- */
.messages-page {
  padding-bottom: var(--space-12);
}

.conversation-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.conversation-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.conversation-item:hover,
.conversation-item.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-text);
}

.conversation-item.unread {
  border-left: 3px solid var(--color-primary);
}

.conversation-item__avatar {
  border-radius: var(--radius-full);
  object-fit: cover;
  flex-shrink: 0;
}

.conversation-item__body {
  flex: 1;
  min-width: 0;
}

.conversation-item__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}

.conversation-item__header strong {
  font-size: var(--font-size-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-item__time {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.conversation-item__listing {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  display: block;
  margin-bottom: var(--space-1);
}

.conversation-item__preview {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-item.unread .conversation-item__preview {
  color: var(--color-text);
  font-weight: 500;
}

.conversation-item__badge {
  min-width: 1.25rem;
  height: 1.25rem;
  padding: 0 0.375rem;
  font-size: var(--font-size-xs);
  font-weight: 700;
  line-height: 1.25rem;
  text-align: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* Chat layout */
.chat-page {
  height: calc(100dvh - var(--header-height));
  margin-top: calc(-1 * var(--space-6));
}

.chat-layout {
  display: grid;
  grid-template-columns: 1fr;
  height: 100%;
}

.chat-sidebar {
  display: none;
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
}

.chat-sidebar__header {
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.chat-main {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--color-bg);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.chat-message {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  max-width: 75%;
}

.chat-message--own {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat-message__avatar {
  border-radius: var(--radius-full);
  object-fit: cover;
  flex-shrink: 0;
}

.chat-message__bubble {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) var(--radius-sm);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.chat-message--own .chat-message__bubble {
  background: var(--color-primary);
  color: #fff;
  border-color: transparent;
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-sm) var(--radius-lg);
}

.chat-message__image {
  max-width: 16rem;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
}

.chat-message__time {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.chat-message--own .chat-message__time {
  color: rgba(255, 255, 255, 0.7);
  text-align: right;
}

.chat-typing {
  padding: 0 var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-style: italic;
  animation: pulse-soft 1.5s ease infinite;
}

.chat-input {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.chat-input input[type="text"],
.chat-input textarea {
  flex: 1;
  border: none;
  background: var(--color-bg-alt);
  border-radius: var(--radius-full);
  padding: 0.625rem 1rem;
}

.chat-input input:focus,
.chat-input textarea:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.chat-input__attach {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.chat-input__attach:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.chat-input__attach input {
  display: none;
}

/* --------------------------------------------------------------------------
   Modals
   -------------------------------------------------------------------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal[hidden] {
  display: none;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
  animation: fade-in 0.2s ease;
}

.modal__content {
  position: relative;
  width: 100%;
  max-width: 28rem;
  max-height: 90dvh;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-xl);
  animation: scale-in 0.2s ease;
}

.modal__content--lg {
  max-width: 36rem;
}

.modal__content h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-5);
}

.modal__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

/* --------------------------------------------------------------------------
   Admin Panel
   -------------------------------------------------------------------------- */
.admin-layout {
  display: grid;
  grid-template-columns: 1fr;
  min-height: calc(100dvh - var(--header-height));
}

.admin-sidebar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.admin-sidebar__brand {
  width: 100%;
  font-weight: 700;
  font-size: var(--font-size-lg);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.admin-sidebar__link {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.admin-sidebar__link:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.admin-sidebar__link--back {
  margin-left: auto;
  color: var(--color-primary);
}

.admin-content {
  padding: var(--space-6);
}

.admin-content h1 {
  margin-bottom: var(--space-6);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: box-shadow var(--transition-fast);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
}

.stat-card--highlight {
  background: var(--gradient-primary);
  border-color: transparent;
  color: #fff;
}

.stat-card--highlight .stat-card__label {
  color: rgba(255, 255, 255, 0.8);
}

.stat-card__value {
  font-size: var(--font-size-2xl);
  font-weight: 800;
}

.stat-card__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.admin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-header__note {
  margin-top: var(--space-2);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.form-hint {
  display: block;
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  line-height: 1.5;
}

.form-hint code {
  font-size: 0.875em;
}

.admin-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  overflow-x: auto;
  margin-bottom: var(--space-6);
}

.admin-panel__hint {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-5);
}

.admin-settings-form textarea {
  width: 100%;
  min-height: 6rem;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font: inherit;
  resize: vertical;
}

.admin-settings-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.admin-panel h2 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-4);
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.admin-table th,
.admin-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}

.admin-table th {
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.admin-table tbody tr:hover {
  background: var(--color-surface-hover);
}

/* --------------------------------------------------------------------------
   Pagination
   -------------------------------------------------------------------------- */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
  flex-wrap: wrap;
}

.pagination__link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  height: 2.5rem;
  padding: 0 var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.pagination__link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pagination__link.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* --------------------------------------------------------------------------
   Empty States
   -------------------------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--color-text-muted);
}

.empty-state svg {
  margin-bottom: var(--space-4);
  opacity: 0.4;
}

.empty-state h2 {
  font-size: var(--font-size-xl);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.empty-state p {
  margin-bottom: var(--space-6);
  max-width: 20rem;
}

/* --------------------------------------------------------------------------
   Flash Messages
   -------------------------------------------------------------------------- */
.flash-container {
  position: fixed;
  top: calc(var(--header-height) + var(--space-3));
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-flash);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: calc(100% - var(--space-8));
  max-width: 28rem;
  pointer-events: none;
}

.flash {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: slide-up 0.3s ease;
  pointer-events: auto;
}

.flash--success {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.flash--error {
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

.flash--warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
  border: 1px solid var(--color-warning);
}

.flash--info {
  background: var(--color-info-bg);
  color: var(--color-info);
  border: 1px solid var(--color-info);
}

/* --------------------------------------------------------------------------
   FAB (Floating Action Button)
   -------------------------------------------------------------------------- */
.fab {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-fab);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.fab:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.5);
  color: #fff;
}

.fab:active {
  transform: scale(0.96);
}

/* --------------------------------------------------------------------------
   Skeleton Loaders
   -------------------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-alt) 25%,
    var(--color-border-light) 50%,
    var(--color-bg-alt) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease infinite;
  border-radius: var(--radius-md);
}

.skeleton--text {
  height: 0.875rem;
  margin-bottom: var(--space-2);
}

.skeleton--title {
  height: 1.25rem;
  width: 70%;
  margin-bottom: var(--space-3);
}

.skeleton--avatar {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-full);
}

.skeleton--image {
  aspect-ratio: 3 / 4;
  width: 100%;
  border-radius: var(--radius-xl);
}

.skeleton--card {
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

/* --------------------------------------------------------------------------
   Error Pages
   -------------------------------------------------------------------------- */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100dvh - var(--header-height) - 8rem);
  padding: var(--space-6);
}

.error-page__content {
  text-align: center;
}

.error-page__content h1 {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-4);
}

.error-page__content p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
  font-size: var(--font-size-lg);
}

/* --------------------------------------------------------------------------
   Responsive — Tablet (768px+)
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-6);
  }

  h1 { font-size: var(--font-size-4xl); }

  .hero__title {
    font-size: var(--font-size-5xl);
  }

  .header__search {
    display: block;
  }

  .header__mobile-toggle {
    display: none;
  }

  .listing-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-5);
  }

  .category-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
  }

  .seller-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__grid {
    grid-template-columns: 2fr repeat(3, 1fr);
  }

  .form-row--3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .listing-detail__grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .profile-header__inner {
    flex-direction: row;
    text-align: left;
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .admin-grid {
    grid-template-columns: 1fr 1fr;
  }

  .search-layout {
    grid-template-columns: 16rem 1fr;
    align-items: start;
  }

  .settings-layout {
    grid-template-columns: 12rem 1fr;
  }

  .settings-nav {
    flex-direction: column;
    overflow-x: visible;
  }

  .chat-layout {
    grid-template-columns: 18rem 1fr;
  }

  .chat-sidebar {
    display: block;
  }

  .skeleton-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .trade-items-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --------------------------------------------------------------------------
   Responsive — Desktop (1024px+)
   -------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  .main-content {
    padding-block: var(--space-8);
  }

  .listing-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .category-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .seller-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .admin-layout {
    grid-template-columns: var(--sidebar-width) 1fr;
  }

  .admin-sidebar {
    flex-direction: column;
    flex-wrap: nowrap;
    border-bottom: none;
    border-right: 1px solid var(--color-border);
    padding: var(--space-6);
    position: sticky;
    top: var(--header-height);
    height: calc(100dvh - var(--header-height));
    overflow-y: auto;
  }

  .admin-sidebar__link--back {
    margin-left: 0;
    margin-top: auto;
  }

  .skeleton-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}