:root {
  --bg: #0a0a0b;
  --bg-secondary: #111113;
  --bg-card: #161618;
  --bg-card-hover: #1a1a1d;
  --border: #1e1e22;
  --text: #e8e8ed;
  --text-secondary: #888891;
  --text-muted: #5c5c66;
  --accent: #6366f1;
  --accent-hover: #5558e6;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ───── Header ───── */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.3px;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* ───── Hero ───── */

.hero {
  padding: 100px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  width: 800px;
  height: 800px;
  transform: translate(-50%, 0);
  background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
  letter-spacing: 0.2px;
}

.hero-subtitle {
  display: block;
  font-size: 16px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 64px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  max-width: 620px;
  margin: 0 auto 32px;
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 56px;
}

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

.stat-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -1px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ───── Buttons ───── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 24px rgba(99, 102, 241, 0.3);
}

.btn-large {
  padding: 16px 32px;
  font-size: 17px;
}

/* ───── Sections ───── */

.section {
  padding: 96px 0;
  text-align: center;
}

.section-dark {
  background: var(--bg-secondary);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 100px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 16px;
  color: var(--text);
}

.section-desc {
  max-width: 580px;
  margin: 0 auto 56px;
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ───── Steps ───── */

.steps-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: left;
  transition: border-color 0.2s, background 0.2s;
}

.step-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  background: var(--bg-card-hover);
}

.step-number {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.step-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.3px;
}

.step-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.step-icons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.icon-badge {
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  font-size: 12px;
  color: var(--accent);
  font-weight: 500;
}

.step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  opacity: 0.5;
}

.step-animation {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.download-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* ───── Features ───── */

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.2s, background 0.2s;
}

.feature-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  background: var(--bg-card-hover);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ───── Tools ───── */

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

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.2s, background 0.2s;
}

.tool-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  background: var(--bg-card-hover);
}

.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.tool-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.tool-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.tool-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s;
}

.tool-link:hover {
  opacity: 0.8;
}

/* ───── Slide Types ───── */

.slides-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: left;
}

.slide-type-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.2s;
}

.slide-type-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.slide-type-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.2px;
}

.slide-type-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.slide-type-visual {
  width: 100%;
  height: 120px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  overflow: hidden;
}

/* Pros & Cons preview */
.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  width: 100%;
  height: 100%;
}

.split-title {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.split-pros .split-title { color: #22c55e; }
.split-cons .split-title { color: #ef4444; }
.split-pros, .split-cons {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.split-item {
  font-size: 9px;
  color: var(--text-muted);
}
.split-pros .split-item { color: #86efac; }
.split-cons .split-item { color: #fca5a5; }

/* Bullet + Image preview */
.bullet-preview {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}
.bullet-item {
  font-size: 9px;
  color: var(--text-muted);
}
.image-placeholder {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.image-placeholder svg { width: 18px; height: 18px; opacity: 0.3; }
.bullet-image {
  display: flex;
  gap: 10px;
  align-items: center;
}

/* Timeline preview */
.timeline-bar {
  display: flex;
  align-items: center;
  gap: 0;
  width: 100%;
}
.timeline-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
}
.timeline-dot.active { background: var(--accent); }
.timeline-line {
  flex: 1;
  height: 2px;
  background: var(--border);
}
.timeline-labels {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-top: 6px;
}
.timeline-labels span {
  font-size: 8px;
  color: var(--text-muted);
}

/* SWOT preview */
.swot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  width: 100%;
}
.swot-cell {
  padding: 6px;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 8px;
}
.swot-label {
  font-size: 14px;
  font-weight: 800;
}
.swot-cell.strengths { background: rgba(34, 197, 94, 0.1); color: #86efac; }
.swot-cell.weaknesses { background: rgba(239, 68, 68, 0.1); color: #fca5a5; }
.swot-cell.opportunities { background: rgba(59, 130, 246, 0.1); color: #93c5fd; }
.swot-cell.threats { background: rgba(234, 179, 8, 0.1); color: #fde68a; }

/* ───── Languages ───── */

.languages-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  max-width: 720px;
  margin: 0 auto;
}

.lang-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: border-color 0.2s;
}

.lang-item:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.lang-flag {
  font-size: 18px;
  line-height: 1;
}

/* ───── FAQ ───── */

.faq-list {
  max-width: 700px;
  margin: 0 auto;
  text-align: left;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:first-child {
  border-top: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  background: none;
  border: none;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: color 0.2s;
}

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

.faq-arrow {
  transition: transform 0.2s;
  flex-shrink: 0;
}

.faq-item.active .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 200px;
  padding-bottom: 20px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ───── CTA ───── */

.cta-section {
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.cta-title {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 12px;
}

.cta-desc {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* ───── Footer ───── */

.footer {
  padding: 64px 0 32px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  text-align: left;
  margin-bottom: 48px;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 12px;
  line-height: 1.6;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: 10px;
  transition: color 0.2s;
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

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

/* ───── Responsive ───── */

@media (max-width: 1024px) {
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .step-arrow {
    display: none;
  }
  .features-grid,
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .slides-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 38px;
  }
  .hero-desc {
    font-size: 16px;
  }
  .hero-stats {
    gap: 28px;
    flex-wrap: wrap;
  }
  .stat-value {
    font-size: 26px;
  }
  .section-title {
    font-size: 30px;
  }
  .section-desc {
    font-size: 15px;
  }
  .features-grid,
  .tools-grid {
    grid-template-columns: 1fr;
  }
  .slides-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
  .section {
    padding: 64px 0;
  }
  .cta-title {
    font-size: 28px;
  }
}