/* ========================================
   serl.ink — Design System
   ======================================== */

:root {
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  /* Transitions */
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme (default) */
[data-theme="dark"] {
  --bg-primary: #0a0a0b;
  --bg-secondary: #111113;
  --bg-tertiary: #18181b;
  --bg-elevated: #1e1e22;
  --bg-hover: #252529;
  --border: #27272a;
  --border-focus: #3f3f46;
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent: #6d5dfc;
  --accent-hover: #7c6efd;
  --accent-muted: rgba(109, 93, 252, 0.15);
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #22c55e;
  --warn: #eab308;
  --code-bg: #0d0d0f;
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --bg-elevated: #ffffff;
  --bg-hover: #f3f4f6;
  --border: #e5e7eb;
  --border-focus: #d1d5db;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --accent: #6d5dfc;
  --accent-hover: #5b4de8;
  --accent-muted: rgba(109, 93, 252, 0.1);
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #16a34a;
  --warn: #ca8a04;
  --code-bg: #f8f9fa;
}

/* ========================================
   Reset & Base
   ======================================== */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  width: 100%;
}

/* ========================================
   Navbar
   ======================================== */

.navbar {
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

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

.logo-icon {
  color: var(--accent);
  font-size: 1.2rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-links a {
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.mobile-menu {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  transition: all var(--transition);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
}

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

/* ========================================
   Hero
   ======================================== */

.hero {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ========================================
   Paste Form
   ======================================== */

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

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

.form-actions-row {
  display: flex;
  gap: var(--space-sm);
}

.title-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  transition: border-color var(--transition);
}

.title-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}

.title-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

.select-input {
  padding: 10px var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color var(--transition);
  flex: 1;
}

.select-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}

/* Editor */
.editor-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

.editor-wrap:focus-within {
  border-color: var(--accent);
}

.editor {
  width: 100%;
  min-height: 400px;
  padding: var(--space-md);
  background: var(--code-bg);
  border: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  resize: vertical;
  tab-size: 4;
}

.editor:focus {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.editor::placeholder {
  color: var(--text-muted);
}

.editor-footer {
  display: flex;
  justify-content: flex-end;
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.char-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Form options */
.form-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.option-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.option-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.text-input {
  padding: 10px var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  transition: border-color var(--transition);
}

.text-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}

.text-input::placeholder {
  color: var(--text-muted);
}

/* Toggle */
.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Visually hidden but accessible to screen readers */
.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;
}

.toggle-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-switch {
  width: 36px;
  height: 20px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 10px;
  position: relative;
  transition: all var(--transition);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition);
}

.toggle-input:checked + .toggle-switch {
  background: var(--accent-muted);
  border-color: var(--accent);
}

.toggle-input:checked + .toggle-switch::after {
  left: 18px;
  background: var(--accent);
}

/* Radio */
.radio-group {
  display: flex;
  gap: var(--space-md);
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 10px var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

.btn-secondary {
  background: transparent;
}

.btn-danger {
  color: var(--danger);
  border-color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
}

.btn-full {
  width: 100%;
  justify-content: center;
  padding: 14px;
  font-size: 1rem;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-shortcut {
  opacity: 0.5;
  font-size: 0.75rem;
}

/* ========================================
   Paste View
   ======================================== */

.paste-view {
  padding: var(--space-xl) 0;
}

.paste-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.paste-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  overflow-wrap: break-word;
  word-wrap: break-word;
  hyphens: auto;
}

.paste-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.meta-icon {
  font-size: 0.7rem;
}

.meta-warn {
  color: var(--warn);
}

.meta-burn {
  color: var(--danger);
}

.paste-actions {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

/* Code block */
.code-block {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-lg);
}

.code-block pre {
  margin: 0;
  padding: var(--space-md);
  background: var(--code-bg) !important;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.7;
}

.code-block code {
  font-family: var(--font-mono) !important;
  font-size: 0.85rem !important;
  background: transparent !important;
}

/* Paste links */
.paste-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.link-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.link-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  min-width: 40px;
}

.link-copy {
  display: flex;
  flex: 1;
  gap: var(--space-xs);
}

.link-input {
  flex: 1;
  padding: 8px var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Keys notice */
.keys-notice {
  padding: var(--space-md);
  background: var(--accent-muted);
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.key-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
}

.key-label {
  font-weight: 600;
  color: var(--text-secondary);
}

.key-value {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg-primary);
  padding: 2px 8px;
  border-radius: 4px;
  user-select: all;
}

/* ========================================
   Paste List (Recent / Search)
   ======================================== */

.page-header {
  padding: var(--space-xl) 0 var(--space-lg);
}

.page-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.paste-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-bottom: var(--space-2xl);
}

.paste-card {
  display: block;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  text-decoration: none;
  overflow: hidden;
}

.paste-card:hover {
  border-color: var(--accent);
  background: var(--bg-elevated);
  transform: translateY(-1px);
}

.paste-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xs);
}

.paste-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.paste-card-lang {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-muted);
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.paste-card-meta {
  display: flex;
  gap: var(--space-md);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-lg) 0 var(--space-2xl);
}

.page-info {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
}

/* ========================================
   Search
   ======================================== */

.search-form {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.search-input {
  flex: 1;
  padding: 12px var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: border-color var(--transition);
}

.search-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-results-count {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

/* ========================================
   Auth (Password)
   ======================================== */

.auth-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
}

.auth-card {
  text-align: center;
  max-width: 380px;
  width: 100%;
}

.auth-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.auth-back {
  display: inline-block;
  margin-top: var(--space-lg);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.alert {
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-top: var(--space-md);
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--danger);
  color: var(--danger);
}

/* ========================================
   Error Pages
   ======================================== */

.error-page {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.error-code {
  font-size: 6rem;
  font-weight: 800;
  color: var(--border);
  line-height: 1;
  margin-bottom: var(--space-md);
}

/* ========================================
   Footer
   ======================================== */

.footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: var(--space-md) 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-md);
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--text-primary);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.6rem;
  }

  .paste-header {
    flex-direction: column;
  }

  .paste-actions {
    width: 100%;
  }

  .paste-actions .btn {
    flex: 1;
    justify-content: center;
  }

  .form-actions-row {
    flex-direction: column;
  }

  .form-options {
    flex-direction: column;
  }

  .link-item {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: var(--space-sm);
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  .search-form {
    flex-direction: column;
  }

  .paste-card-meta {
    flex-wrap: wrap;
  }
}

/* ========================================
   Syntax highlighting overrides
   ======================================== */

pre[class*="language-"],
code[class*="language-"] {
  font-family: var(--font-mono) !important;
  font-size: 0.85rem !important;
  text-shadow: none !important;
}

/* Prism theme overrides for dark */
[data-theme="dark"] pre[class*="language-"] {
  background: var(--code-bg) !important;
}

[data-theme="light"] pre[class*="language-"] {
  background: #f6f8fa !important;
}

/* Smooth page transitions */
main {
  animation: fadeIn 200ms ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Selection */
::selection {
  background: var(--accent-muted);
  color: var(--text-primary);
}

/* Focus visible for keyboard nav */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Reduced motion */
@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;
  }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-focus);
}