:root {
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-card-subtle: #334155;
  --primary-gold: #f59e0b;
  --primary-gold-hover: #d97706;
  --accent-red: #ef4444;
  --accent-green: #10b981;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: rgba(255, 255, 255, 0.08);
}

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

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navbar */
.navbar {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
}

.nav-cta {
  background-color: var(--bg-card);
  color: var(--text-main);
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  transition: 0.2s ease;
}

.nav-cta:hover {
  background-color: var(--bg-card-subtle);
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}

.badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  background: rgba(245, 158, 11, 0.12);
  color: var(--primary-gold);
  border: 1px solid rgba(245, 158, 11, 0.3);
  margin-bottom: 20px;
}

.hero-text h1 {
  font-size: 54px;
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.highlight {
  background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-text p {
  font-size: 17px;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #0f172a;
  text-decoration: none;
  padding: 16px 28px;
  border-radius: 14px;
  box-shadow: 0 10px 24px rgba(245, 158, 11, 0.25);
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(245, 158, 11, 0.35);
}

.android-icon {
  flex-shrink: 0;
}

.btn-text small {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 700;
  opacity: 0.85;
}

.btn-text strong {
  font-size: 16px;
  font-weight: 800;
}

.file-info {
  font-size: 13px;
  color: var(--text-muted);
}

/* Device Mockup */
.device-mockup {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.mockup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.mockup-chip {
  background: rgba(245, 158, 11, 0.15);
  color: var(--primary-gold);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 8px;
}

.mockup-score {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-green);
}

.word-card {
  display: flex;
  align-items: center;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  padding: 14px 16px;
  border-radius: 12px;
  margin-bottom: 12px;
}

.word-status {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--accent-green);
  margin-right: 14px;
}

.word-meta h4 {
  font-size: 15px;
  font-weight: 700;
}

.word-meta p {
  font-size: 12px;
  color: var(--text-muted);
}

.audio-btn {
  margin-left: auto;
  font-size: 16px;
  opacity: 0.8;
}

.progress-box {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  margin-bottom: 8px;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background-color: var(--bg-card-subtle);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  width: 80%;
  height: 100%;
  background: linear-gradient(90deg, #f59e0b, #10b981);
  border-radius: 4px;
}

/* Features */
.features {
  padding: 80px 0;
  border-top: 1px solid var(--border-color);
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 34px;
  font-weight: 800;
  margin-bottom: 12px;
}

.section-title p {
  color: var(--text-muted);
  font-size: 16px;
}

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

.feature-card {
  background: var(--bg-card);
  padding: 30px;
  border-radius: 18px;
  border: 1px solid var(--border-color);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
}

/* Instructions */
.instructions {
  padding: 60px 0 80px;
  border-top: 1px solid var(--border-color);
}

.steps-container h2 {
  text-align: center;
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 40px;
}

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

.step-item {
  background: var(--bg-card);
  padding: 24px;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  position: relative;
}

.step-number {
  display: inline-flex;
  width: 32px;
  height: 32px;
  background-color: var(--primary-gold);
  color: #0f172a;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 14px;
}

.step-item h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 13px;
  color: var(--text-muted);
}

.step-item code {
  background: rgba(255, 255, 255, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--primary-gold);
}

/* Footer */
footer {
  padding: 30px 0;
  border-top: 1px solid var(--border-color);
  background-color: #080d19;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-content a {
  color: var(--text-main);
  text-decoration: none;
}

/* Responsive */
@media (max-width: 880px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-text h1 {
    font-size: 40px;
  }
  .feature-grid, .steps-grid {
    grid-template-columns: 1fr;
  }
  .footer-content {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
}