/* ===========================
   RESET & BASE
=========================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --clr-bg:        #0b0f1a;
  --clr-surface:   #111827;
  --clr-border:    #1f2937;
  --clr-primary:   #6366f1;
  --clr-primary-h: #818cf8;
  --clr-accent:    #22d3ee;
  --clr-text:      #f1f5f9;
  --clr-muted:     #94a3b8;
  --radius:        12px;
  --radius-lg:     20px;
  --shadow:        0 4px 32px rgba(0,0,0,.4);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }

/* ===========================
   BUTTONS
=========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .55rem 1.25rem;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all .2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--clr-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--clr-primary-h); transform: translateY(-1px); }
.btn-ghost { color: var(--clr-muted); }
.btn-ghost:hover { color: var(--clr-text); }
.btn-outline {
  border-color: var(--clr-border);
  color: var(--clr-text);
}
.btn-outline:hover { border-color: var(--clr-primary); color: var(--clr-primary); }
.btn-lg { padding: .8rem 1.8rem; font-size: 1.05rem; border-radius: var(--radius-lg); }

/* ===========================
   NAVBAR
=========================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,15,26,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: 1.2rem;
  font-weight: 700;
  flex-shrink: 0;
}
.logo-icon { font-size: 1.4rem; color: var(--clr-primary); }
.nav-links {
  display: flex;
  gap: 1.8rem;
  margin-right: auto;
}
.nav-links a { color: var(--clr-muted); font-size: .95rem; transition: color .2s; }
.nav-links a:hover { color: var(--clr-text); }
.nav-actions { display: flex; gap: .75rem; }
.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--clr-text);
  font-size: 1.4rem;
  cursor: pointer;
  margin-left: auto;
}
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem 1.5rem 1.5rem;
  border-top: 1px solid var(--clr-border);
}
.mobile-menu.open { display: flex; }
.mobile-menu a { color: var(--clr-muted); font-size: 1rem; }

/* ===========================
   HERO
=========================== */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 6rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.badge {
  display: inline-block;
  padding: .3rem .9rem;
  background: rgba(99,102,241,.15);
  border: 1px solid rgba(99,102,241,.35);
  border-radius: 999px;
  font-size: .82rem;
  color: var(--clr-primary-h);
  margin-bottom: 1.2rem;
}
.hero-content h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.1rem;
}
.gradient-text {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--clr-muted);
  margin-bottom: 2rem;
  max-width: 460px;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.hero-note { font-size: .85rem; color: var(--clr-muted); }

/* Upload card */
.upload-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
}
.drop-zone {
  border: 2px dashed var(--clr-border);
  border-radius: var(--radius);
  padding: 2.5rem 1rem;
  text-align: center;
  transition: border-color .2s, background .2s;
  cursor: pointer;
}
.drop-zone.drag-over {
  border-color: var(--clr-primary);
  background: rgba(99,102,241,.06);
}
.drop-icon { font-size: 2.8rem; margin-bottom: .5rem; }
.drop-title { font-weight: 600; margin-bottom: .25rem; }
.drop-sub { color: var(--clr-muted); font-size: .9rem; margin-bottom: 1rem; }

.upload-list { margin-top: 1rem; display: flex; flex-direction: column; gap: .5rem; }
.upload-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  background: rgba(255,255,255,.04);
  border-radius: var(--radius);
  padding: .6rem .9rem;
  font-size: .88rem;
}
.upload-item .file-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.upload-item .file-size { color: var(--clr-muted); flex-shrink: 0; }
.upload-item .remove-btn {
  background: none; border: none; color: var(--clr-muted);
  cursor: pointer; font-size: 1rem; line-height: 1;
  transition: color .2s;
}
.upload-item .remove-btn:hover { color: #f87171; }

.upload-footer {
  margin-top: 1.2rem;
  display: flex;
  justify-content: space-between;
  font-size: .8rem;
  color: var(--clr-muted);
  border-top: 1px solid var(--clr-border);
  padding-top: .9rem;
}

/* ===========================
   STATS
=========================== */
.stats {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}
.stats-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}
.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--clr-primary-h);
}
.stat-unit { font-size: 2rem; font-weight: 800; color: var(--clr-primary-h); }
.stat-label { display: block; color: var(--clr-muted); font-size: .9rem; margin-top: .25rem; }

/* ===========================
   SECTIONS SHARED
=========================== */
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}
.section-header h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; margin-bottom: .6rem; }
.section-header p { color: var(--clr-muted); font-size: 1.05rem; }

/* ===========================
   FEATURES
=========================== */
.features {
  max-width: 1200px;
  margin: 0 auto;
  padding: 6rem 1.5rem;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.feature-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color .2s, transform .2s;
}
.feature-card:hover { border-color: var(--clr-primary); transform: translateY(-3px); }
.feature-icon { font-size: 2rem; margin-bottom: 1rem; }
.feature-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: .5rem; }
.feature-card p { color: var(--clr-muted); font-size: .93rem; }

/* ===========================
   PRICING
=========================== */
.pricing {
  padding: 6rem 1.5rem;
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}
.pricing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .9rem;
  margin-bottom: 3rem;
  font-weight: 600;
}
.pricing-toggle span { color: var(--clr-muted); transition: color .2s; }
.pricing-toggle span.active { color: var(--clr-text); }
.badge-save {
  font-style: normal;
  font-size: .78rem;
  background: rgba(34,211,238,.15);
  color: var(--clr-accent);
  border-radius: 999px;
  padding: .1rem .55rem;
  margin-left: .3rem;
}
/* toggle switch */
.toggle-switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; inset: 0;
  background: var(--clr-border);
  border-radius: 999px;
  cursor: pointer;
  transition: background .2s;
}
.slider::before {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  left: 3px; top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform .2s;
}
.toggle-switch input:checked + .slider { background: var(--clr-primary); }
.toggle-switch input:checked + .slider::before { transform: translateX(20px); }

.pricing-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  align-items: start;
}
.pricing-card {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
}
.pricing-card.featured {
  border-color: var(--clr-primary);
  background: linear-gradient(135deg, rgba(99,102,241,.08), rgba(34,211,238,.04));
}
.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--clr-primary);
  color: #fff;
  font-size: .75rem;
  font-weight: 700;
  padding: .2rem .9rem;
  border-radius: 999px;
  white-space: nowrap;
}
.pricing-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; }
.price { margin-bottom: 1.5rem; }
.amount { font-size: 2.5rem; font-weight: 800; }
.period { color: var(--clr-muted); font-size: .95rem; }
.pricing-features { display: flex; flex-direction: column; gap: .6rem; margin-bottom: 1.8rem; }
.pricing-features li { font-size: .92rem; color: var(--clr-muted); }
.pricing-features li::first-letter { color: var(--clr-accent); }
.pricing-card .btn { width: 100%; }

/* ===========================
   FAQ
=========================== */
.faq {
  max-width: 760px;
  margin: 0 auto;
  padding: 6rem 1.5rem;
}
.faq-list { display: flex; flex-direction: column; gap: .75rem; }
.faq-item {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--clr-text);
  font-size: 1rem;
  font-weight: 600;
  padding: 1.1rem 1.3rem;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq-arrow {
  font-size: 1.3rem;
  color: var(--clr-muted);
  transition: transform .25s;
  flex-shrink: 0;
}
.faq-item.open .faq-arrow { transform: rotate(90deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease, padding .3s ease;
  color: var(--clr-muted);
  font-size: .95rem;
  padding: 0 1.3rem;
}
.faq-item.open .faq-answer {
  max-height: 200px;
  padding: 0 1.3rem 1.2rem;
}

/* ===========================
   CTA BANNER
=========================== */
.cta {
  text-align: center;
  padding: 6rem 1.5rem;
  background: radial-gradient(ellipse at center, rgba(99,102,241,.12) 0%, transparent 70%);
}
.cta h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); font-weight: 800; margin-bottom: .8rem; }
.cta p { color: var(--clr-muted); margin-bottom: 2rem; font-size: 1.05rem; }

/* ===========================
   FOOTER
=========================== */
.footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 1.5rem 2.5rem;
  display: flex;
  gap: 4rem;
  flex-wrap: wrap;
}
.footer-brand { max-width: 220px; }
.footer-brand p { color: var(--clr-muted); font-size: .9rem; margin-top: .5rem; }
.footer-links {
  display: flex;
  gap: 4rem;
  flex-wrap: wrap;
  flex: 1;
}
.footer-links div { display: flex; flex-direction: column; gap: .6rem; }
.footer-links h4 { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--clr-muted); margin-bottom: .2rem; }
.footer-links a { color: var(--clr-muted); font-size: .9rem; transition: color .2s; }
.footer-links a:hover { color: var(--clr-text); }
.footer-bottom {
  border-top: 1px solid var(--clr-border);
  text-align: center;
  padding: 1.5rem;
  color: var(--clr-muted);
  font-size: .85rem;
}

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

@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; padding-top: 3rem; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; }
  .nav-links, .nav-actions { display: none; }
  .hamburger { display: block; }
}

@media (max-width: 480px) {
  .stats-inner { grid-template-columns: 1fr 1fr; }
  .footer-inner { flex-direction: column; gap: 2rem; }
  .footer-links { gap: 2rem; }
}