/* ============================================
   AI PPTX Analyzer — Mobile-first Styles
   ============================================ */

:root {
  --bg: #0a0f1e;
  --bg-soft: #111827;
  --card: #1a2035;
  --card-2: #1e2642;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --text: #f1f5f9;
  --text-dim: #94a3b8;
  --accent: #6366f1;
  --accent-2: #a78bfa;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --success: #34d399;
  --warning: #fbbf24;
  --danger: #f87171;
  --blue: #60a5fa;
  --cyan: #22d3ee;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
}

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

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100dvh;
  background-image:
    radial-gradient(ellipse at 15% 0%, rgba(99, 102, 241, 0.15), transparent 50%),
    radial-gradient(ellipse at 85% 10%, rgba(167, 139, 250, 0.1), transparent 45%),
    radial-gradient(ellipse at 50% 100%, rgba(34, 211, 238, 0.08), transparent 50%);
  background-attachment: fixed;
}

.container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 30, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
}

.logo {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  letter-spacing: 0.05em;
}

/* ===== HERO ===== */
.hero {
  text-align: center;
  padding: 48px 16px 32px;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  pointer-events: none;
  opacity: 0.5;
}

.hero-kicker {
  color: var(--cyan);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.hero-title {
  font-size: clamp(1.8rem, 7vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
  position: relative;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-sub {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto 28px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ===== FILTER BAR ===== */
.filter-bar {
  display: flex;
  gap: 8px;
  padding: 16px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.filter-bar::-webkit-scrollbar {
  display: none;
}

.filter-btn {
  font-family: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

.filter-btn:hover,
.filter-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px var(--accent-glow);
}

/* ===== TOOLS GRID ===== */
.tools-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 8px 0 32px;
}

.tool-card {
  background: linear-gradient(160deg, var(--card), var(--card-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
  animation: card-in 0.4s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.tool-card.hidden {
  display: none;
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.tool-rank {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font-mono);
}

.tool-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tool-badge.best { background: rgba(251, 191, 36, 0.15); color: var(--warning); }
.tool-badge.pro { background: rgba(99, 102, 241, 0.15); color: var(--accent-2); }
.tool-badge.design { background: rgba(34, 211, 238, 0.15); color: var(--cyan); }
.tool-badge.allround { background: rgba(52, 211, 153, 0.15); color: var(--success); }
.tool-badge.ms { background: rgba(96, 165, 250, 0.15); color: var(--blue); }
.tool-badge.fast { background: rgba(251, 191, 36, 0.15); color: var(--warning); }
.tool-badge.chat { background: rgba(52, 211, 153, 0.15); color: var(--success); }
.tool-badge.story { background: rgba(167, 139, 250, 0.15); color: var(--accent-2); }
.tool-badge.gs { background: rgba(96, 165, 250, 0.15); color: var(--blue); }

.tool-name {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.tool-tagline {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 18px;
}

/* Features */
.tool-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
}

.feature {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.feature-icon {
  font-size: 0.85rem;
  flex-shrink: 0;
}

/* Pros & Cons */
.tool-pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 18px;
}

.pros, .cons {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.pros h4, .cons h4 {
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pros h4 { color: var(--success); }
.cons h4 { color: var(--danger); }

.pros ul, .cons ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pros li, .cons li {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
  padding-left: 14px;
  position: relative;
}

.pros li::before {
  content: "+";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

.cons li::before {
  content: "−";
  position: absolute;
  left: 0;
  color: var(--danger);
  font-weight: 700;
}

/* Pricing */
.tool-pricing {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.price-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
}

.price-tag.free { background: rgba(52, 211, 153, 0.15); color: var(--success); }
.price-tag.trial { background: rgba(96, 165, 250, 0.15); color: var(--blue); }
.price-tag.paid { background: rgba(248, 113, 113, 0.15); color: var(--danger); }
.price-tag.limited { background: rgba(251, 191, 36, 0.15); color: var(--warning); }

.price-detail {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Link */
.tool-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-2);
  text-decoration: none;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

.tool-link:hover {
  background: rgba(167, 139, 250, 0.1);
  border-color: var(--accent-2);
}

/* ===== COMPARISON TABLE ===== */
.comparison-section {
  padding: 32px 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  text-align: center;
}

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.comparison-table th {
  background: var(--card-2);
  padding: 14px 16px;
  text-align: left;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

.comparison-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-dim);
  white-space: nowrap;
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table td strong {
  color: var(--text);
}

.comparison-table tr:hover td {
  background: rgba(99, 102, 241, 0.05);
}

/* ===== RECOMMENDATIONS ===== */
.reco-section {
  padding: 32px 0;
}

.reco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.reco-card {
  background: linear-gradient(160deg, var(--card), var(--card-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 18px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.reco-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.reco-icon {
  font-size: 1.8rem;
  display: block;
  margin-bottom: 10px;
}

.reco-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.reco-card p {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.reco-card strong {
  color: var(--accent-2);
}

/* ===== FAQ ===== */
.faq-section {
  padding: 32px 0;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--border-hover);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.2s ease;
}

.faq-question:hover {
  color: var(--accent-2);
}

.faq-icon {
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--accent-2);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.open .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 18px 16px;
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 48px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.footer-note {
  margin-top: 6px;
  font-size: 0.78rem;
  opacity: 0.7;
}

/* ===== ANIMATIONS ===== */
@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== RESPONSIVE ===== */
@media (min-width: 480px) {
  .tool-features {
    gap: 10px;
  }

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

@media (min-width: 768px) {
  .hero {
    padding: 64px 24px 40px;
  }

  .tool-card {
    padding: 28px 26px;
  }

  .tools-grid {
    gap: 20px;
  }

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

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

@supports (padding: max(0px)) {
  .site-header .header-inner {
    padding-top: max(14px, env(safe-area-inset-top));
  }

  main {
    padding-bottom: max(48px, env(safe-area-inset-bottom));
  }
}