/* PolySkill — Browse page theme */

:root {
  /* Colors (light) */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F4F4F5;
  --bg-tertiary: #EFEFEF;
  --bg-tag: rgba(255, 255, 255, 0.8);
  --text-primary: #111111;
  --text-secondary: #5F6368;
  --text-muted: #C0C0C0;
  --accent: #1A73E8;
  --border: #eee;
  --border-subtle: rgba(0, 0, 0, 0.04);
  --border-card-footer: rgba(0, 0, 0, 0.05);
  --bg-sidebar: rgba(255, 255, 255, 0.8);
  --bg-header: rgba(255, 255, 255, 0.9);
  --bg-search-focus: #EEEEEE;
  --bg-suggestions: #fff;
  --shadow-suggestions: rgba(0, 0, 0, 0.08);
  --bg-category-active: #EBF2FD;
  --bg-category-active-hover: #D6E4FA;
  --badge-verified-bg: #E8F5E9;
  --verified: #2E7D32;
  --danger: #D32F2F;
  --bg-add-btn: rgba(255, 255, 255, 0.6);
  --bg-add-btn-hover: #fff;
  --shadow-add-btn: rgba(0, 0, 0, 0.05);
  --bg-avatar: #ddd;
  --search-placeholder: #999;
  --bg-pagination-btn: #fff;
  --bg-hamburger: #fff;
  --shadow-hamburger: rgba(0, 0, 0, 0.06);
  --overlay-bg: rgba(0, 0, 0, 0.3);
  --icon-btn-hover-border: #ccc;
  --sidebar-mobile-bg: #fff;

  /* Layout tokens */
  --border-radius-lg: 28px;
  --border-radius-md: 16px;
  --border-radius-pill: 999px;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0D1117;
  --bg-secondary: #161B22;
  --bg-tertiary: #1C2128;
  --bg-tag: rgba(30, 35, 44, 0.85);
  --text-primary: #E6EDF3;
  --text-secondary: #8B949E;
  --text-muted: #484F58;
  --accent: #58A6FF;
  --border: rgba(255, 255, 255, 0.06);
  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-card-footer: rgba(255, 255, 255, 0.06);
  --bg-sidebar: rgba(13, 17, 23, 0.9);
  --bg-header: rgba(13, 17, 23, 0.9);
  --bg-search-focus: #1C2128;
  --bg-suggestions: #161B22;
  --shadow-suggestions: rgba(0, 0, 0, 0.4);
  --bg-category-active: rgba(88, 166, 255, 0.1);
  --bg-category-active-hover: rgba(88, 166, 255, 0.15);
  --badge-verified-bg: rgba(63, 185, 80, 0.15);
  --verified: #3FB950;
  --danger: #F85149;
  --bg-add-btn: rgba(255, 255, 255, 0.08);
  --bg-add-btn-hover: rgba(255, 255, 255, 0.15);
  --shadow-add-btn: rgba(0, 0, 0, 0.3);
  --bg-avatar: #30363D;
  --search-placeholder: #484F58;
  --bg-pagination-btn: #161B22;
  --bg-hamburger: #161B22;
  --shadow-hamburger: rgba(0, 0, 0, 0.3);
  --overlay-bg: rgba(0, 0, 0, 0.6);
  --icon-btn-hover-border: rgba(255, 255, 255, 0.15);
  --sidebar-mobile-bg: #0D1117;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  overflow: hidden;
  font-size: 16px;
  line-height: 1.5;
}

h1 {
  font-weight: 400;
  font-size: 42px;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

h2 {
  font-weight: 500;
  font-size: 24px;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

h3 {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 4px;
}

p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Page layout */
.page-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  width: 100%;
  height: 100%;
}

/* Sidebar */
.sidebar {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-subtle);
  background: var(--bg-sidebar);
  backdrop-filter: blur(20px);
  z-index: 10;
  overflow-y: auto;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  margin-bottom: 60px;
}

.sidebar-logo .logo-img {
  height: 96px;
  width: auto;
}

[data-theme="light"] .sidebar-logo .logo-img {
  filter: invert(1);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 24px;
  flex: 1;
}

.nav-item {
  font-size: 20px;
  font-weight: 400;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: -0.5px;
  position: relative;
  display: flex;
  align-items: center;
  border: none;
  background: none;
  padding: 0;
  font-family: inherit;
  text-align: left;
}

.nav-item:hover {
  color: var(--text-secondary);
}

.nav-item.active {
  color: var(--text-primary);
}

.sidebar-footer {
  margin-top: auto;
  padding-top: 40px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
}

.sidebar-footer a {
  font-size: 14px;
  color: var(--text-muted);
  transition: var(--transition);
}

.sidebar-footer a:hover {
  color: var(--text-secondary);
}

.sidebar-github {
  display: inline-block;
  color: var(--text-muted);
  transition: var(--transition);
}

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

/* Main content */
.main-content {
  overflow-y: auto;
  padding: 0;
  position: relative;
}

/* Header strip */
.header-strip {
  position: sticky;
  top: 0;
  padding: 24px 40px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 16px;
  background: var(--bg-header);
  backdrop-filter: blur(10px);
  z-index: 5;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-secondary);
}

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

.icon-btn svg {
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

/* Email subscription modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  z-index: 50;
  align-items: center;
  justify-content: center;
}

.modal-overlay.open {
  display: flex;
}

.modal-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 40px;
  width: 100%;
  max-width: 420px;
  position: relative;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-secondary);
  cursor: pointer;
  line-height: 1;
  padding: 4px;
}

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

.modal-heading {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
}

.modal-sub {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.modal-form {
  display: flex;
  gap: 8px;
}

.modal-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--border-radius-pill);
  font-family: inherit;
  font-size: 15px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
}

.modal-input:focus {
  border-color: var(--accent);
}

.modal-submit {
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--border-radius-pill);
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.modal-submit:hover {
  opacity: 0.9;
}

.modal-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.modal-msg {
  margin-top: 12px;
  font-size: 14px;
  min-height: 20px;
}

.modal-msg.success {
  color: var(--verified);
}

.modal-msg.error {
  color: var(--danger);
}

/* Content scroll area */
.content-scroll {
  padding: 20px 60px 80px;
  max-width: 1400px;
  margin: 0 auto;
}

/* Hero section */
.hero-section {
  text-align: center;
  margin: 0 auto 60px;
  max-width: 600px;
}

.hero-sub {
  font-size: 20px;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Search bar */
.search-wrapper {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 32px auto 0;
}

.hero-search {
  background: var(--bg-secondary);
  padding: 16px 24px;
  border-radius: var(--border-radius-pill);
  width: 100%;
  border: none;
  font-family: inherit;
  font-size: 16px;
  outline: none;
  color: var(--text-primary);
  transition: var(--transition);
}

.hero-search:focus {
  background: var(--bg-search-focus);
}

.hero-search::placeholder {
  color: var(--search-placeholder);
}

/* Suggestions dropdown */
.suggestions-box {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-suggestions);
  border: 1px solid var(--border);
  border-radius: 16px;
  margin-top: 8px;
  z-index: 100;
  box-shadow: 0 8px 24px var(--shadow-suggestions);
  max-height: 320px;
  overflow-y: auto;
  display: none;
}

.suggestion-item {
  padding: 12px 24px;
  cursor: pointer;
  font-size: 15px;
  color: var(--text-primary);
  transition: background 0.15s;
}

.suggestion-item:hover {
  background: var(--bg-secondary);
}

.suggestion-item:first-child {
  border-radius: 16px 16px 0 0;
}

.suggestion-item:last-child {
  border-radius: 0 0 16px 16px;
}

/* Collapsible sections (trending + categories) */
#trending-section,
#category-section {
  transition: opacity 0.2s ease, max-height 0.3s ease;
  overflow: hidden;
  max-height: 1200px; /* generous upper bound — must fit 5-row mobile category grid */
}

#trending-section.hidden,
#category-section.hidden {
  opacity: 0;
  max-height: 0;
  margin: 0;
  pointer-events: none;
}

/* Section headers */
.section-header {
  font-size: 20px;
  margin-bottom: 24px;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Trending grid */
.trending-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.trending-card {
  background: var(--bg-secondary);
  border-radius: var(--border-radius-md);
  padding: 24px;
  cursor: pointer;
  transition: var(--transition);
  display: block;
  color: inherit;
}

.trending-card:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

.trending-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  font-weight: 500;
}

.trending-card p {
  font-size: 14px;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Category grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 48px;
  min-height: 300px;
}

.category-card {
  background: var(--bg-secondary);
  border-radius: var(--border-radius-md);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.category-card:hover {
  transform: translateY(-2px);
}

.category-icon {
  width: 64px;
  height: 64px;
  object-fit: contain;
  margin-bottom: 8px;
}

.cat-automation .category-icon {
  transform: scale(1.44);
}

.category-card h3 {
  font-size: 15px;
  font-weight: 500;
}

.category-card .category-count {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Per-category accent colors */
.cat-productivity       { --cat-rgb: 74, 222, 128; }
.cat-automation         { --cat-rgb: 96, 165, 250; }
.cat-coding-data        { --cat-rgb: 74, 222, 128; }
.cat-creative-media     { --cat-rgb: 251, 146, 60; }
.cat-security           { --cat-rgb: 96, 165, 250; }
.cat-marketing-sales    { --cat-rgb: 251, 191, 36; }
.cat-research-learning  { --cat-rgb: 148, 163, 184; }
.cat-crypto-web3        { --cat-rgb: 167, 139, 250; }
.cat-finance            { --cat-rgb: 20, 184, 166; }
.cat-legal              { --cat-rgb: 205, 170, 145; }

/* Liquid glass gradients (light theme) */
.category-card[class*="cat-"] {
  border-color: rgba(var(--cat-rgb), 0.15);
  background: radial-gradient(ellipse at 50% 20%, rgba(var(--cat-rgb), 0.08) 0%, rgba(var(--cat-rgb), 0.02) 60%, transparent 100%);
}

.category-card[class*="cat-"]:hover {
  background: radial-gradient(ellipse at 50% 20%, rgba(var(--cat-rgb), 0.11) 0%, rgba(var(--cat-rgb), 0.03) 60%, transparent 100%);
}

/* Liquid glass gradients (dark theme) */
[data-theme="dark"] .category-card {
  border-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .category-card[class*="cat-"] {
  border-color: rgba(var(--cat-rgb), 0.20);
  background: radial-gradient(ellipse at 50% 20%, rgba(var(--cat-rgb), 0.18) 0%, rgba(var(--cat-rgb), 0.04) 60%, transparent 100%);
}

[data-theme="dark"] .category-card[class*="cat-"]:hover {
  background: radial-gradient(ellipse at 50% 20%, rgba(var(--cat-rgb), 0.22) 0%, rgba(var(--cat-rgb), 0.06) 60%, transparent 100%);
}

/* Active category card — specificity must beat [class*="cat-"](:hover) selectors */
.category-card.active,
.category-card.active:hover {
  border-color: var(--accent);
  background: var(--bg-category-active);
}

[data-theme="dark"] .category-card.active,
[data-theme="dark"] .category-card.active:hover {
  border-color: var(--accent);
  background: var(--bg-category-active);
}

/* Filter toolbar */
.filter-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 24px;
}

.filter-toolbar select,
.filter-toolbar .checkbox-label {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-pill);
  padding: 8px 16px;
  font-family: inherit;
  font-size: 14px;
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
  transition: var(--transition);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%235F6368'%3E%3Cpath d='M6 8.5L1 3.5h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.filter-toolbar select:focus {
  border-color: var(--accent);
}

[data-theme="dark"] .filter-toolbar select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238B949E'%3E%3Cpath d='M6 8.5L1 3.5h10z'/%3E%3C/svg%3E");
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  background-image: none !important;
  padding-right: 16px !important;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

.active-filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-category-active);
  color: var(--accent);
  border-radius: var(--border-radius-pill);
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.active-filter-pill:hover {
  background: var(--bg-category-active-hover);
}

.active-filter-pill .clear-x {
  font-size: 16px;
  line-height: 1;
}

/* Skill cards grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
  min-height: 400px;
}

/* Skill card */
.skill-card {
  background: var(--bg-secondary);
  border-radius: var(--border-radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 300px;
  position: relative;
  transition: var(--transition);
  cursor: pointer;
  overflow: hidden;
  border: 1px solid transparent;
  color: inherit;
}

.skill-card:hover {
  transform: translateY(-4px);
  background: var(--bg-tertiary);
}

.card-tag {
  position: absolute;
  top: 24px;
  left: 24px;
  padding: 6px 14px;
  background: var(--bg-tag);
  border: 1px solid var(--border-card-footer);
  border-radius: var(--border-radius-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  backdrop-filter: blur(4px);
}

.card-type-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 40px;
  margin-bottom: 24px;
  color: var(--accent);
}

.card-type-icon svg {
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.card-content {
  flex-grow: 1;
}

.card-title {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text-primary);
  font-weight: 500;
  overflow-wrap: break-word;
}

.card-desc {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid var(--border-card-footer);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

.user-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-avatar);
}

.add-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-add-btn);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-size: 18px;
  transition: var(--transition);
  cursor: pointer;
}

.skill-card:hover .add-btn {
  background: var(--bg-add-btn-hover);
  box-shadow: 0 2px 8px var(--shadow-add-btn);
}

/* Verified badge */
.verified-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--badge-verified-bg);
  color: var(--verified);
  border-radius: var(--border-radius-pill);
  font-size: 11px;
  font-weight: 600;
  position: absolute;
  top: 24px;
  right: 24px;
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  padding: 16px 0;
}

.pagination-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--border-radius-pill);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-pagination-btn);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.pagination-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination-info {
  color: var(--text-secondary);
  font-size: 14px;
}

/* Loading / error / empty states */
.loading-state,
.error-state,
.empty-state {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-secondary);
  font-size: 16px;
}

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

/* Visually hidden (screen-reader only) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Body scroll lock when mobile sidebar is open */
body.sidebar-open {
  overflow: hidden;
}

/* Mobile hamburger */
.hamburger-btn {
  display: none;
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 20;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-hamburger);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px var(--shadow-hamburger);
  color: var(--text-primary);
}

.hamburger-btn svg {
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  z-index: 9;
}

/* Responsive: tablet */
@media (max-width: 1024px) {
  .page-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 10;
    background: var(--sidebar-mobile-bg);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.open {
    display: block;
  }

  .hamburger-btn {
    display: flex;
  }

  .header-strip {
    padding-left: 72px;
  }

  .content-scroll {
    padding: 20px 32px 80px;
  }
}

/* Responsive: phone */
@media (max-width: 768px) {
  h1 {
    font-size: 28px;
  }

  .hero-sub {
    font-size: 16px;
  }

  .content-scroll {
    padding: 16px 20px 60px;
  }

  .skills-grid {
    grid-template-columns: 1fr;
    min-height: 600px;
  }

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

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    min-height: 680px;
  }

  .filter-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .skill-card {
    min-height: auto;
    padding: 24px;
  }

  .modal-card {
    margin: 16px;
    padding: 24px;
  }

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

@media (max-width: 480px) {
  .category-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
}