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

:root {
  --bg: #0a1628;
  --bg-secondary: #0e1422;
  --card: rgba(19, 26, 42, 0.6);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(255, 255, 255, 0.15);
  --text: #e8f0ff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);
  --accent-fire: #FF6A3D;
  --accent-mep: #4ECDC4;
  --accent-santiye: #60A5FA;
  --radius: 16px;
  --radius-sm: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --font: 'Geist Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background: var(--bg);
  font-family: var(--font);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ── Layout ────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navigation ────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background var(--transition), backdrop-filter var(--transition);
}

.nav.scrolled {
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

.nav-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Hero ──────────────────────────────────── */
.hero {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 60px;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 106, 61, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero .subtitle {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 8px;
}

.hero .tagline {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ── App Cards Grid ────────────────────────── */
.apps-section {
  padding: 40px 0 100px;
}

.apps-section h2 {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 48px;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ── Glass Card ────────────────────────────── */
.glass-card {
  position: relative;
  background: var(--card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.12), transparent);
}

.glass-card:hover {
  transform: translateY(-8px);
  border-color: var(--card-border-hover);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.glass-card[data-accent="fire"]:hover { border-color: rgba(255, 106, 61, 0.3); }
.glass-card[data-accent="mep"]:hover { border-color: rgba(78, 205, 196, 0.3); }
.glass-card[data-accent="santiye"]:hover { border-color: rgba(96, 165, 250, 0.3); }

/* Card Icon */
.card-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.card-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.card-icon[data-accent="fire"] {
  background: linear-gradient(135deg, rgba(255,106,61,0.2), rgba(255,106,61,0.05));
  border: 1px solid rgba(255,106,61,0.2);
}
.card-icon[data-accent="mep"] {
  background: linear-gradient(135deg, rgba(78,205,196,0.2), rgba(78,205,196,0.05));
  border: 1px solid rgba(78,205,196,0.2);
}
.card-icon[data-accent="santiye"] {
  background: linear-gradient(135deg, rgba(96,165,250,0.2), rgba(96,165,250,0.05));
  border: 1px solid rgba(96,165,250,0.2);
}

/* Detail Page Logo */
.detail-logo {
  width: 80px;
  height: 80px;
  min-width: 80px;
  max-width: 80px;
  border-radius: 18px;
  margin: 0 auto 20px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  flex-shrink: 0;
  display: block;
}

.detail-logo img {
  width: 80px;
  max-width: 80px;
  height: 80px;
  object-fit: cover;
  display: block;
}

.card-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  font-size: 0.6rem;
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-badge.web { background: var(--accent-fire); color: #fff; }
.card-badge.ios { background: var(--accent-mep); color: #0a1628; }
.card-badge.ios-blue { background: var(--accent-santiye); color: #0a1628; }

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
  flex: 1;
}

.card-features {
  list-style: none;
  margin-bottom: 28px;
}

.card-features li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-features li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.glass-card[data-accent="fire"] .card-features li::before { background: var(--accent-fire); }
.glass-card[data-accent="mep"] .card-features li::before { background: var(--accent-mep); }
.glass-card[data-accent="santiye"] .card-features li::before { background: var(--accent-santiye); }

/* ── Buttons ───────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 10px;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-fire {
  background: linear-gradient(135deg, var(--accent-fire), #ff8a5c);
  color: #fff;
}
.btn-fire:hover { box-shadow: 0 8px 30px rgba(255,106,61,0.3); }

.btn-mep {
  background: linear-gradient(135deg, var(--accent-mep), #7ae5df);
  color: #0a1628;
}
.btn-mep:hover { box-shadow: 0 8px 30px rgba(78,205,196,0.3); }

.btn-santiye {
  background: linear-gradient(135deg, var(--accent-santiye), #93c5fd);
  color: #0a1628;
}
.btn-santiye:hover { box-shadow: 0 8px 30px rgba(96,165,250,0.3); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text);
}
.btn-outline:hover {
  border-color: var(--card-border-hover);
  background: rgba(255,255,255,0.03);
}

/* ── Detail Page Sections ──────────────────── */
.detail-hero {
  padding: 120px 24px 60px;
  text-align: center;
}

.detail-hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.detail-hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 32px;
}

.detail-hero .hero-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-badge {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
}

/* Features Grid */
.features-section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 48px;
  font-size: 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 28px 24px;
  transition: border-color var(--transition), transform var(--transition);
}

.feature-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* How It Works */
.how-section {
  padding: 80px 0;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.step {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 32px 24px;
  position: relative;
  counter-increment: step;
}

.step::before {
  content: counter(step);
  position: absolute;
  top: -14px;
  left: 24px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
}

.page-fire .step::before { background: var(--accent-fire); color: #fff; }
.page-mep .step::before { background: var(--accent-mep); color: #0a1628; }
.page-santiye .step::before { background: var(--accent-santiye); color: #0a1628; }

.step h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  margin-top: 4px;
}

.step p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Categories Grid (MEP Calc) */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.category-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  font-size: 0.9rem;
  transition: border-color var(--transition);
}

.category-chip:hover { border-color: var(--card-border-hover); }

.category-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 60px 0;
}

.stat {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-fire .stat-number { color: var(--accent-fire); }
.page-mep .stat-number { color: var(--accent-mep); }
.page-santiye .stat-number { color: var(--accent-santiye); }

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Footer ────────────────────────────────── */
.footer {
  border-top: 1px solid var(--card-border);
  padding: 40px 0;
  text-align: center;
}

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

.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 16px;
  list-style: none;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition);
}

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

/* ── Screenshot & Promo Grids ──────────────── */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.screenshot-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.screenshot-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
}

.screenshot-card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  background: var(--bg-secondary);
}

.screenshot-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  padding: 16px 20px 4px;
}

.screenshot-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 0 20px 20px;
  line-height: 1.5;
}

.card-screenshot {
  margin: 0 -8px 20px;
  border-radius: 10px;
  overflow: hidden;
  max-height: 280px;
}

.card-screenshot img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  object-position: top center;
  background: var(--bg-secondary);
  border-radius: 10px;
}

.promo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.promo-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--card-border);
  transition: border-color var(--transition), transform var(--transition);
}

.promo-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
}

.promo-card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  background: var(--bg-secondary);
}

/* ── Scroll Animations ─────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ────────────────────────────── */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .apps-grid { grid-template-columns: 1fr; max-width: 440px; margin: 0 auto; }
  .features-grid { grid-template-columns: 1fr; }
  .screenshot-grid { grid-template-columns: 1fr; max-width: 340px; margin: 0 auto; }
  .promo-grid { grid-template-columns: 1fr; max-width: 340px; margin: 0 auto; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .categories-grid { grid-template-columns: 1fr; }

  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--card-border);
  }
  .hamburger { display: flex; }

  .hero { min-height: 50vh; padding: 100px 24px 40px; }
  .detail-hero { padding: 100px 24px 40px; }
  .glass-card { padding: 32px 24px; }
}

@media (max-width: 480px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat-number { font-size: 2rem; }
  .container { padding: 0 16px; }
}