/* ===== CSS Variables ===== */
:root {
  --bg-page: #08090a;
  --bg-panel: #0f1011;
  --bg-surface: #191a1b;
  --bg-hover: #23252a;
  --bg-elevated: #28282c;
  --text-primary: #f7f8f8;
  --text-secondary: #d0d6e0;
  --text-tertiary: #8a8f98;
  --text-quaternary: #62666d;
  --brand-indigo: #5e6ad2;
  --brand-violet: #7170ff;
  --brand-hover: #828fff;
  --border-subtle: rgba(255,255,255,0.05);
  --border-standard: rgba(255,255,255,0.08);
  --border-prominent: rgba(255,255,255,0.12);
  --focus-ring: rgba(113, 112, 255, 0.4);
  --success: #10b981;
  --warning: #f59e0b;
  --font-primary: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;

  /* Easing curves */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-primary);
  font-feature-settings: "cv01", "ss03";
  background: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  overscroll-behavior: none;
  -webkit-overflow-scrolling: touch;
}
body::before {
  content: '';
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px;
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }

/* ===== Navbar ===== */
.navbar {
  position: sticky; top: 0;
  background: rgba(15, 16, 17, 0.85);
  backdrop-filter: blur(12px) saturate(1.2);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 24px; height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  z-index: 100;
}
.logo {
  font: 600 18px/1 var(--font-primary); letter-spacing: -0.3px;
  color: var(--text-primary);
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; transition: opacity 0.15s;
}
.logo:hover { opacity: 0.85; }
.logo-icon {
  width: 28px; height: 28px;
  background: var(--brand-indigo); border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
}
.nav-status {
  font: 500 13px/1 var(--font-primary); color: var(--text-tertiary);
  display: flex; align-items: center; gap: 8px;
  cursor: pointer; padding: 4px 10px; border-radius: 6px;
  transition: all 0.15s; text-decoration: none;
}
.nav-status:hover { background: rgba(255,255,255,0.04); color: var(--text-secondary); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; }
.status-dot.active { background: var(--success); box-shadow: 0 0 8px rgba(16, 185, 129, 0.4); }
.status-dot.inactive { background: var(--text-quaternary); }

/* ===== Hero ===== */
.hero {
  padding: 72px 24px 40px; text-align: center;
  max-width: 720px; margin: 0 auto;
}
.hero h1 {
  font: 600 48px/1.05 var(--font-primary); letter-spacing: -1.4px;
  color: var(--text-primary); margin-bottom: 16px;
}
.hero p {
  font: 400 18px/1.6 var(--font-primary);
  color: var(--text-tertiary); margin-bottom: 36px;
}

/* ===== Search Box ===== */
.search-container { position: relative; max-width: 640px; margin: 0 auto; }
.search-box-wrapper {
  position: relative; background: var(--bg-surface);
  border: 1px solid var(--border-standard); border-radius: 12px;
  padding: 4px; transition: all 0.25s var(--ease-out-quart);
}
.search-box-wrapper:focus-within {
  border-color: var(--brand-violet);
  box-shadow: 0 0 0 1px rgba(113,112,255,0.1), 0 0 20px rgba(113,112,255,0.15), 0 0 0 3px var(--focus-ring);
}
.search-inner { display: flex; align-items: center; gap: 12px; padding: 12px 16px; }
.search-icon { color: var(--text-quaternary); flex-shrink: 0; }
.search-input {
  flex: 1; background: transparent; border: none; outline: none;
  font: 400 16px/1.5 var(--font-primary); color: var(--text-primary);
  caret-color: var(--brand-violet);
}
.search-input::placeholder { color: var(--text-quaternary); }
.search-kbd {
  font: 500 12px/1 var(--font-mono); color: var(--text-quaternary);
  background: var(--bg-hover); border: 1px solid var(--border-standard);
  border-radius: 6px; padding: 4px 8px; flex-shrink: 0; letter-spacing: 0.5px;
}
.search-clear {
  display: none; align-items: center; justify-content: center;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--text-quaternary); color: var(--bg-page);
  border: none; cursor: pointer; font-size: 12px; line-height: 1;
  transition: background 0.15s; flex-shrink: 0;
}
.search-clear:hover { background: var(--text-tertiary); }
.search-clear.show { display: flex; }

/* Result count */
.result-count {
  text-align: center; font: 400 13px/1 var(--font-primary);
  color: var(--text-quaternary); margin-top: 12px; min-height: 18px;
  transition: opacity 0.2s;
}
.result-count:empty { opacity: 0; }

/* ===== Tags Bar ===== */
.tags-bar {
  display: flex; gap: 8px; padding: 0 24px 24px;
  max-width: 720px; margin: 0 auto;
  overflow-x: auto; scrollbar-width: none;
  position: relative;
}
.tags-bar::-webkit-scrollbar { display: none; }
.tag {
  background: transparent; color: var(--text-tertiary);
  border: 1px solid var(--border-standard); border-radius: 9999px;
  padding: 6px 14px; font: 500 13px/1 var(--font-primary);
  cursor: pointer; white-space: nowrap; transition: all 0.2s var(--ease-out-quart);
}
.tag:hover { background: rgba(255,255,255,0.04); color: var(--text-secondary); border-color: var(--border-prominent); }
.tag.active { background: var(--brand-indigo); color: #fff; border-color: var(--brand-indigo); }

/* ===== Results Grid ===== */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px; padding: 0 24px 48px;
  max-width: 1200px; margin: 0 auto;
}

/* ===== Skill Card ===== */
.skill-card {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-standard);
  border-radius: 10px; padding: 20px 20px 20px 24px;
  cursor: pointer; transition: all 0.25s var(--ease-out-quart);
  position: relative; overflow: hidden;
  opacity: 0; transform: translateY(12px);
}
.skill-card.visible {
  opacity: 1; transform: translateY(0);
}
.skill-card::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; }
.skill-card:hover {
  background: rgba(255,255,255,0.04);
  border-color: var(--border-prominent);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}
.cat-职场::before  { background: #5e6ad2; }
.cat-编程::before  { background: #0a72ef; }
.cat-写作::before  { background: #f59e0b; }
.cat-学习::before  { background: #06b6d4; }
.cat-生活::before  { background: #10b981; }
.cat-创意::before  { background: #ec4899; }
.cat-商业::before  { background: #f97316; }
.cat-营销::before  { background: #8b5cf6; }
.cat-健康::before  { background: #14b8a6; }
.cat-AI工具::before { background: #6366f1; }
.skill-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 10px; gap: 12px; }
.skill-title { font: 600 18px/1.3 var(--font-primary); letter-spacing: -0.2px; color: var(--text-primary); }
.skill-stars { font: 500 12px/1 var(--font-mono); color: var(--text-tertiary); display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
.skill-desc { font: 400 15px/1.6 var(--font-primary); color: var(--text-tertiary); margin-bottom: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.skill-footer { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.skill-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.skill-tag { font: 500 11px/1 var(--font-primary); color: var(--text-quaternary); background: var(--bg-hover); padding: 4px 9px; border-radius: 4px; }
.skill-source { font: 400 12px/1 var(--font-mono); color: var(--text-quaternary); flex-shrink: 0; max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Highlight in search */
mark.highlight {
  background: rgba(113, 112, 255, 0.18);
  color: var(--brand-violet);
  border-radius: 3px;
  padding: 0 2px;
  font-weight: 500;
}

/* ===== Modal ===== */
.modal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.75); backdrop-filter: blur(6px);
  z-index: 200; align-items: center; justify-content: center; padding: 24px;
  opacity: 0; transition: opacity 0.2s ease;
}
.modal-overlay.active { display: flex; opacity: 1; }
.modal-content {
  background: var(--bg-surface); border: 1px solid var(--border-standard);
  border-radius: 16px; max-width: 680px; width: 100%; max-height: 85vh;
  overflow-y: auto; padding: 28px;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.05), 0 24px 64px rgba(0,0,0,0.6);
  transform: scale(0.96) translateY(12px);
  transition: transform 0.25s var(--ease-out-expo);
}
.modal-overlay.active .modal-content { transform: scale(1) translateY(0); }
.modal-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 20px; gap: 16px; }
.modal-title { font: 600 24px/1.3 var(--font-primary); letter-spacing: -0.4px; color: var(--text-primary); }
.modal-close {
  background: rgba(255,255,255,0.03); border: 1px solid var(--border-standard);
  border-radius: 50%; width: 32px; height: 32px; display: flex;
  align-items: center; justify-content: center; color: var(--text-tertiary);
  cursor: pointer; font-size: 18px; line-height: 1; transition: all 0.15s;
  flex-shrink: 0;
}
.modal-close:hover { background: rgba(255,255,255,0.06); color: var(--text-primary); }
.modal-meta { display: flex; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.modal-meta-item { font: 400 13px/1 var(--font-mono); color: var(--text-quaternary); }
.modal-section { margin-bottom: 20px; }
.modal-section-label { font: 600 12px/1 var(--font-primary); color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 10px; }
.modal-section-body { font: 400 15px/1.7 var(--font-primary); color: var(--text-secondary); }
.code-block {
  background: var(--bg-page); border: 1px solid var(--border-standard);
  border-radius: 10px; padding: 16px; font: 400 14px/1.7 var(--font-mono);
  color: var(--text-secondary); overflow-x: auto; position: relative;
  white-space: pre-wrap; word-break: break-word;
}
.copy-btn {
  position: absolute; top: 12px; right: 12px;
  background: var(--bg-hover); border: 1px solid var(--border-standard);
  border-radius: 6px; padding: 6px 12px; font: 500 12px/1 var(--font-primary);
  color: var(--text-secondary); cursor: pointer; transition: all 0.15s;
}
.copy-btn:hover { background: var(--bg-elevated); color: var(--text-primary); }
.copy-btn.copied { background: rgba(16,185,129,0.15); color: var(--success); border-color: rgba(16,185,129,0.3); }

/* ===== Activation Modal ===== */
.act-modal { max-width: 400px; }
.act-input {
  width: 100%; background: var(--bg-page); border: 1px solid var(--border-standard);
  border-radius: 8px; padding: 12px 16px; font: 500 16px/1.5 var(--font-mono);
  color: var(--text-primary); caret-color: var(--brand-violet);
  letter-spacing: 2px; text-transform: uppercase; outline: none;
  transition: border-color 0.2s;
}
.act-input:focus { border-color: var(--brand-violet); box-shadow: 0 0 0 3px var(--focus-ring); }
.act-input::placeholder { color: var(--text-quaternary); letter-spacing: normal; text-transform: none; }
.btn-primary {
  background: var(--brand-indigo); color: #fff; border: none;
  border-radius: 6px; padding: 10px 20px; font: 500 14px/1.43 var(--font-primary);
  cursor: pointer; transition: all 0.2s var(--ease-out-quart); width: 100%; margin-top: 12px;
}
.btn-primary:hover { background: var(--brand-hover); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.act-error { font: 400 13px/1.5 var(--font-primary); color: #ef4444; margin-top: 8px; display: none; }

/* Modal CTA row */
.modal-cta {
  display: flex; gap: 10px; margin-top: 20px;
}
.btn-ghost {
  background: rgba(255,255,255,0.02); color: var(--text-secondary);
  border: 1px solid var(--border-standard); border-radius: 6px;
  padding: 8px 16px; font: 500 14px/1.43 var(--font-primary);
  cursor: pointer; transition: all 0.15s; text-decoration: none; display: inline-flex; align-items: center; justify-content: center;
}
.btn-ghost:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }

/* ===== Toast ===== */
.toast-container {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  z-index: 300; display: flex; flex-direction: column; gap: 8px;
  pointer-events: none;
}
.toast {
  background: var(--bg-elevated); color: var(--text-primary);
  border: 1px solid var(--border-standard); border-radius: 10px;
  padding: 12px 20px; font: 500 14px/1.5 var(--font-primary);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  display: flex; align-items: center; gap: 8px;
  opacity: 0; transform: translateY(12px) scale(0.96);
  transition: all 0.35s var(--ease-out-expo);
  pointer-events: auto;
}
.toast.show { opacity: 1; transform: translateY(0) scale(1); }
.toast.success { border-color: rgba(16,185,129,0.3); }
.toast.success::before { content: '✓'; color: var(--success); font-weight: 600; }
.toast.error { border-color: rgba(239,68,68,0.3); }
.toast.error::before { content: '!'; color: #ef4444; font-weight: 600; }

/* ===== Loading / Empty ===== */
.skeleton {
  background: linear-gradient(90deg, rgba(255,255,255,0.02) 25%, rgba(255,255,255,0.05) 50%, rgba(255,255,255,0.02) 75%);
  background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: 6px;
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.empty-state { text-align: center; padding: 80px 24px; color: var(--text-quaternary); display: none; }
.empty-state.show { display: block; animation: fadeInUp 0.4s var(--ease-out-expo); }
.empty-state-icon { font-size: 48px; margin-bottom: 16px; opacity: 0.5; }
.empty-state h3 { font: 500 18px/1.4 var(--font-primary); color: var(--text-tertiary); margin-bottom: 8px; }
.empty-state p { font: 400 14px/1.5 var(--font-primary); }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Footer ===== */
.footer { text-align: center; padding: 40px 24px; border-top: 1px solid var(--border-subtle); font: 400 13px/1.5 var(--font-primary); color: var(--text-quaternary); }
.footer a { color: var(--text-tertiary); text-decoration: none; transition: color 0.15s; }
.footer a:hover { color: var(--text-secondary); }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero { padding: 48px 20px 32px; }
  .hero h1 { font-size: 32px; letter-spacing: -0.8px; }
  .hero p { font-size: 16px; }
  .results-grid { grid-template-columns: 1fr; padding: 0 16px 32px; }
  .search-kbd { display: none; }

  /* Mobile sheet modal */
  .modal-overlay { align-items: flex-end; padding: 0; }
  .modal-overlay.active { display: flex; }
  .modal-content {
    max-width: 100%; border-radius: 16px 16px 0 0;
    max-height: 88vh; transform: translateY(100%);
    transition: transform 0.35s var(--ease-out-expo);
  }
  .modal-overlay.active .modal-content { transform: translateY(0); }
  .modal-close { width: 36px; height: 36px; }
}