:root {
  --brand: #4A90E2;
  --brand-dark: #2E6AB3;
  --accent: #50C878;
  --bg: #ffffff;
  --text: #1a1a2e;
  --muted: #64748b;
  --surface: #ffffff;
  --ring: rgba(74, 144, 226, 0.15);
  --card-blue: #4A90E2;
  --card-yellow: #FFC83C;
  --card-green: #50C878;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --surface: #1a1d26;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f8fafc, #f1f5f9);
  line-height: 1.6;
}
@media (prefers-color-scheme: dark) {
  body {
    background: radial-gradient(1200px 600px at 20% -10%, rgba(74,144,226,0.2), transparent),
                radial-gradient(900px 500px at 120% -20%, rgba(80,200,120,0.15), transparent),
                #0f1117;
  }
}

/* Navigation */
header.nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(180%) blur(12px);
  background: rgba(255,255,255,0.85);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
@media (prefers-color-scheme: dark) {
  header.nav { background: rgba(15,17,23,0.85); border-bottom-color: rgba(255,255,255,0.08); }
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.row { display: flex; gap: 16px; align-items: center; justify-content: space-between; min-height: 64px; flex-wrap: wrap; }
.logo { display: flex; gap: 10px; align-items: center; }
.logo img { width: 32px; height: 32px; border-radius: 8px; }
.logo span { font-weight: 700; font-size: 18px; }
.nav-actions { display: flex; gap: 20px; align-items: center; }
.nav-actions a { color: var(--text); text-decoration: none; font-size: 14px; opacity: 0.8; transition: opacity 0.2s; }
.nav-actions a:hover { opacity: 1; }
.btn-nav { background: var(--brand); color: #fff !important; padding: 8px 16px; border-radius: 8px; opacity: 1 !important; }
.lang-link, .lang-switch a {
  font-size: 13px;
  padding: 6px 12px;
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 6px;
  opacity: 1 !important;
}
@media (prefers-color-scheme: dark) {
  .lang-link, .lang-switch a { border-color: rgba(255,255,255,0.15); }
}
.lang-switch { margin-left: auto; }

/* Hero */
.hero {
  padding: 80px 0 60px;
}
.hero .grid {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center;
}
@media (max-width: 800px) {
  .hero .grid { grid-template-columns: 1fr; text-align: center; }
  .cta { justify-content: center; }
}

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 500; padding: 8px 14px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(74,144,226,0.12), rgba(80,200,120,0.08));
  color: var(--brand-dark);
  border: 1px solid rgba(74,144,226,0.2);
}
.title {
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.15;
  margin: 16px 0;
  letter-spacing: -0.5px;
  font-weight: 800;
}
.lead { font-size: clamp(16px, 2.5vw, 19px); color: var(--muted); margin-bottom: 28px; }
.cta { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.btn {
  appearance: none; border: 0; cursor: pointer;
  border-radius: 12px; padding: 14px 24px;
  font-weight: 600; font-size: 15px;
  text-decoration: none; display: inline-block;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff;
  box-shadow: 0 8px 24px -8px var(--brand);
}
.btn.secondary {
  background: rgba(0,0,0,0.04);
  color: var(--text);
  border: 1px solid rgba(0,0,0,0.08);
}
@media (prefers-color-scheme: dark) {
  .btn.secondary { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.1); }
}
.shadow-ring { box-shadow: 0 0 0 6px var(--ring), 0 8px 24px -8px var(--brand); }
.note { font-size: 13px; color: var(--muted); margin-top: 12px; }

/* Mock Card Stack */
.mock {
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(74,144,226,0.08), rgba(80,200,120,0.05));
  border: 1px solid rgba(74,144,226,0.15);
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
@media (prefers-color-scheme: dark) {
  .mock { background: linear-gradient(145deg, rgba(74,144,226,0.12), rgba(80,200,120,0.08)); border-color: rgba(255,255,255,0.1); }
}

.mock-cards {
  position: relative;
  width: 240px;
  height: 300px;
}
.mock-card {
  position: absolute;
  width: 220px;
  height: 140px;
  border-radius: 16px;
  left: 50%;
  transform: translateX(-50%);
}
.card-green {
  background: linear-gradient(135deg, #50C878, #3DA35D);
  bottom: 0;
  transform: translateX(-50%) rotate(-8deg);
}
.card-yellow {
  background: linear-gradient(135deg, #FFC83C, #F5A623);
  bottom: 50px;
  transform: translateX(-50%) rotate(5deg);
}
.card-blue {
  background: linear-gradient(135deg, #4A90E2, #2E6AB3);
  bottom: 100px;
  transform: translateX(-50%) rotate(-2deg);
  box-shadow: 0 10px 40px -10px rgba(74,144,226,0.5);
}
.card-blue::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 20px;
  width: 45px;
  height: 35px;
  background: linear-gradient(135deg, #FFD700, #FFA500);
  border-radius: 6px;
}
.card-blue::after {
  content: "✓";
  position: absolute;
  bottom: 16px;
  right: 20px;
  width: 28px;
  height: 28px;
  background: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand);
  font-size: 16px;
  font-weight: bold;
}

/* Sections */
.section { padding: 80px 0; }
.section h2 { font-size: clamp(24px, 4vw, 32px); margin: 0 0 12px; font-weight: 700; }
.section .desc { color: var(--muted); margin: 0 0 40px; font-size: 17px; }
.alt-bg { background: rgba(0,0,0,0.02); }
@media (prefers-color-scheme: dark) {
  .alt-bg { background: rgba(255,255,255,0.02); }
}

/* Feature Cards */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 900px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .features { grid-template-columns: 1fr; } }

.card {
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 20px;
  padding: 24px;
  background: var(--surface);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px -12px rgba(0,0,0,0.1);
}
@media (prefers-color-scheme: dark) {
  .card { border-color: rgba(255,255,255,0.08); }
  .card:hover { box-shadow: 0 12px 40px -12px rgba(0,0,0,0.4); }
}
.card .emoji { font-size: 28px; margin-bottom: 8px; }
.card h3 { margin: 8px 0 10px; font-size: 18px; font-weight: 600; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.5; }

/* Card Types */
.card-types {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 900px) { .card-types { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 600px) { .card-types { grid-template-columns: repeat(2, 1fr); } }

.card-type {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
}
@media (prefers-color-scheme: dark) {
  .card-type { border-color: rgba(255,255,255,0.08); }
}
.type-icon { font-size: 20px; }

/* CTA Section */
.cta-section { text-align: center; }
.center { text-align: center; }
.center .cta { justify-content: center; }

/* Footer */
footer {
  padding: 40px 0;
  border-top: 1px solid rgba(0,0,0,0.06);
  color: var(--muted);
  font-size: 14px;
}
@media (prefers-color-scheme: dark) { footer { border-top-color: rgba(255,255,255,0.08); } }
footer .links { display: flex; gap: 24px; flex-wrap: wrap; }
footer a { color: var(--muted); text-decoration: none; transition: color 0.2s; }
footer a:hover { color: var(--text); }
.copyright { margin-top: 24px; font-size: 13px; }

/* Animations */
[data-animate] { opacity: 0; transform: translateY(12px); animation: fadeIn 0.6s ease forwards; }
@keyframes fadeIn { to { opacity: 1; transform: none; } }