/* ========== Reset & Base ========== */
    *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
      font-family: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
      background: #0c0a07;
      color: #fff;
      overflow-x: hidden;
      line-height: 1.6;
    }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; display: block; }
    button { cursor: pointer; border: none; font-family: inherit; }

    /* ========== Utility ========== */
    .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
    .gradient-text {
      background: linear-gradient(135deg, #F59E0B, #F97316, #EF4444);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px; font-weight: 700;
      letter-spacing: 2px; text-transform: uppercase;
      color: #F59E0B;
      border: 1px solid rgba(245,158,11,0.3);
      border-radius: 20px;
      padding: 6px 16px;
      margin-bottom: 16px;
    }
    .section-title {
      font-size: clamp(32px, 5vw, 52px);
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 18px;
      color: rgba(255,255,255,0.6);
      max-width: 600px;
      line-height: 1.7;
    }

    /* ========== Ambient glow ========== */
    .glow {
      position: absolute;
      border-radius: 50%;
      filter: blur(120px);
      pointer-events: none;
      opacity: 0.35;
    }
    .glow-amber { background: #F59E0B; }
    .glow-orange { background: #F97316; }
    .glow-red { background: #EF4444; }

    /* ========== NAV ========== */
    nav {
      position: fixed; top: 0; left: 0; right: 0;
      z-index: 100;
      padding: 16px 0;
      transition: background 0.3s, backdrop-filter 0.3s;
    }
    nav.scrolled {
      background: rgba(12,10,7,0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    nav .container {
      display: flex; align-items: center; justify-content: space-between;
    }
    .nav-logo {
      font-size: 24px; font-weight: 900;
      letter-spacing: -0.5px;
    }
    .nav-links { display: flex; align-items: center; gap: 32px; }
    .nav-links a {
      font-size: 14px; font-weight: 500;
      color: rgba(255,255,255,0.6);
      transition: color 0.2s;
    }
    .nav-links a:hover { color: #F59E0B; }
    .nav-cta {
      background: #F59E0B;
      color: #0c0a07;
      font-size: 14px; font-weight: 700;
      padding: 10px 24px;
      border-radius: 10px;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .nav-cta:hover {
      transform: translateY(-1px);
      box-shadow: 0 8px 24px rgba(245,158,11,0.3);
    }
    .lang-switch {
      display: flex; align-items: center; gap: 8px;
      font-size: 12px; font-weight: 600;
      border-left: 1px solid rgba(255,255,255,0.1);
      padding-left: 16px; margin-left: 8px;
    }
    .lang-switch a {
      color: rgba(255,255,255,0.4) !important;
      padding: 4px 8px; border-radius: 6px;
      transition: background 0.2s, color 0.2s;
    }
    .lang-switch a:hover { color: #F59E0B !important; background: rgba(245,158,11,0.1); }
    .lang-active {
      color: #F59E0B;
      background: rgba(245,158,11,0.12);
      padding: 4px 8px; border-radius: 6px;
    }
    .nav-mobile-btn { display: none; background: none; color: #fff; font-size: 24px; }

    /* ========== HERO ========== */
    .hero {
      position: relative;
      min-height: 100vh;
      display: flex; align-items: center;
      padding: 120px 0 80px;
      overflow: hidden;
    }
    .hero .glow-1 { width: 600px; height: 600px; top: -200px; right: -100px; }
    .hero .glow-2 { width: 400px; height: 400px; bottom: -100px; left: -100px; }
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-badge {
      display: inline-flex; align-items: center; gap: 8px;
      background: rgba(245,158,11,0.1);
      border: 1px solid rgba(245,158,11,0.2);
      border-radius: 20px;
      padding: 6px 16px;
      font-size: 13px; font-weight: 600;
      color: #F59E0B;
      margin-bottom: 24px;
    }
    .hero-badge span { animation: pulse-dot 2s infinite; }
    @keyframes pulse-dot {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.4; }
    }
    .hero h1 {
      font-size: clamp(40px, 6vw, 72px);
      font-weight: 900;
      line-height: 1.08;
      margin-bottom: 24px;
      letter-spacing: -1.5px;
    }
    .hero p {
      font-size: 18px;
      color: rgba(255,255,255,0.6);
      line-height: 1.7;
      margin-bottom: 40px;
      max-width: 500px;
    }
    .hero-actions { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
    .btn-primary {
      background: linear-gradient(135deg, #F59E0B, #F97316);
      color: #0c0a07;
      font-size: 16px; font-weight: 700;
      padding: 16px 36px;
      border-radius: 14px;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 32px rgba(245,158,11,0.35);
    }
    .btn-ghost {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.12);
      color: #fff;
      font-size: 16px; font-weight: 600;
      padding: 16px 36px;
      border-radius: 14px;
      transition: background 0.2s, border-color 0.2s;
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.1);
      border-color: rgba(255,255,255,0.2);
    }

    /* Phone mockup */
    .hero-visual {
      position: relative;
      display: flex; justify-content: center;
    }
    .phone-frame {
      width: 300px;
      height: 620px;
      background: linear-gradient(145deg, #1a1510, #241e14);
      border-radius: 40px;
      border: 2px solid rgba(245,158,11,0.15);
      padding: 12px;
      position: relative;
      box-shadow: 0 40px 80px rgba(0,0,0,0.5), 0 0 60px rgba(245,158,11,0.08);
    }
    .phone-screen {
      width: 100%;
      height: 100%;
      background: #1a1510;
      border-radius: 30px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .phone-notch {
      width: 120px; height: 28px;
      background: #0c0a07;
      border-radius: 0 0 16px 16px;
      margin: 0 auto;
    }
    .phone-chat {
      flex: 1;
      padding: 16px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      overflow: hidden;
    }
    .chat-header {
      text-align: center;
      padding-bottom: 12px;
      border-bottom: 1px solid rgba(255,255,255,0.06);
      margin-bottom: 4px;
    }
    .chat-header-name { font-size: 15px; font-weight: 700; color: #F59E0B; }
    .chat-header-desc { font-size: 11px; color: rgba(255,255,255,0.4); margin-top: 2px; }
    .chat-bubble {
      padding: 10px 14px;
      border-radius: 16px;
      font-size: 13px;
      line-height: 1.5;
      max-width: 85%;
      animation: bubble-in 0.5s ease-out both;
    }
    .chat-bubble.ai {
      background: rgba(255,255,255,0.06);
      border-bottom-left-radius: 4px;
      align-self: flex-start;
      color: rgba(255,255,255,0.85);
    }
    .chat-bubble.user {
      background: rgba(245,158,11,0.12);
      border-bottom-right-radius: 4px;
      align-self: flex-end;
      color: #F59E0B;
    }
    .chat-bubble:nth-child(2) { animation-delay: 0.3s; }
    .chat-bubble:nth-child(3) { animation-delay: 0.8s; }
    .chat-bubble:nth-child(4) { animation-delay: 1.3s; }
    .chat-bubble:nth-child(5) { animation-delay: 1.8s; }
    .chat-bubble:nth-child(6) { animation-delay: 2.3s; }
    @keyframes bubble-in {
      from { opacity: 0; transform: translateY(12px); }
      to   { opacity: 1; transform: translateY(0); }
    }
    .phone-input-bar {
      display: flex; align-items: center; gap: 8px;
      padding: 10px 16px;
      border-top: 1px solid rgba(255,255,255,0.06);
    }
    .phone-input-field {
      flex: 1;
      background: rgba(255,255,255,0.06);
      border-radius: 18px;
      padding: 8px 14px;
      font-size: 12px;
      color: rgba(255,255,255,0.3);
    }
    .phone-send-btn {
      width: 32px; height: 32px;
      background: #F59E0B;
      border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
      font-size: 14px; font-weight: 800;
      color: #0c0a07;
    }
    /* Floating orbits */
    .orbit-ring {
      position: absolute;
      border: 1px solid rgba(245,158,11,0.08);
      border-radius: 50%;
      animation: orbit-spin 30s linear infinite;
    }
    .orbit-ring-1 { width: 500px; height: 500px; top: 50%; left: 50%; transform: translate(-50%,-50%); }
    .orbit-ring-2 { width: 640px; height: 640px; top: 50%; left: 50%; transform: translate(-50%,-50%); animation-direction: reverse; animation-duration: 45s; }
    @keyframes orbit-spin { to { transform: translate(-50%,-50%) rotate(360deg); } }
    .orbit-dot {
      position: absolute;
      width: 8px; height: 8px;
      background: #F59E0B;
      border-radius: 50%;
      box-shadow: 0 0 12px rgba(245,158,11,0.6);
    }

    /* ========== STATS BAR ========== */
    .stats-bar {
      padding: 48px 0;
      border-top: 1px solid rgba(255,255,255,0.06);
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .stats-bar .container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-item h3 {
      font-size: 42px; font-weight: 900;
      letter-spacing: -1px;
    }
    .stat-item p {
      font-size: 14px; font-weight: 500;
      color: rgba(255,255,255,0.4);
      margin-top: 4px;
    }

    /* ========== FEATURES ========== */
    .features {
      padding: 120px 0;
      position: relative;
    }
    .features-header { text-align: center; margin-bottom: 64px; }
    .features-header .section-desc { margin: 0 auto; }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .feature-card {
      background: rgba(255,255,255,0.03);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 20px;
      padding: 36px 28px;
      transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
      position: relative;
      overflow: hidden;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      border-color: rgba(245,158,11,0.2);
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .feature-card::before {
      content: '';
      position: absolute; top: 0; left: 0; right: 0;
      height: 2px;
      background: linear-gradient(90deg, transparent, #F59E0B, transparent);
      opacity: 0;
      transition: opacity 0.3s;
    }
    .feature-card:hover::before { opacity: 1; }
    .feature-icon {
      width: 52px; height: 52px;
      border-radius: 14px;
      display: flex; align-items: center; justify-content: center;
      font-size: 24px;
      margin-bottom: 20px;
    }
    .feature-icon.amber { background: rgba(245,158,11,0.12); }
    .feature-icon.orange { background: rgba(249,115,22,0.12); }
    .feature-icon.red { background: rgba(239,68,68,0.12); }
    .feature-icon.blue { background: rgba(59,130,246,0.12); }
    .feature-icon.green { background: rgba(34,197,94,0.12); }
    .feature-icon.purple { background: rgba(168,85,247,0.12); }
    .feature-card h3 {
      font-size: 20px; font-weight: 700;
      margin-bottom: 10px;
    }
    .feature-card p {
      font-size: 14px; line-height: 1.7;
      color: rgba(255,255,255,0.5);
    }

    /* ========== AI PARTNERS ========== */
    .partners {
      padding: 120px 0;
      position: relative;
      background: linear-gradient(180deg, transparent, rgba(245,158,11,0.02), transparent);
    }
    .partners-header { text-align: center; margin-bottom: 64px; }
    .partners-header .section-desc { margin: 0 auto; }
    .partners-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .partner-card {
      background: rgba(255,255,255,0.03);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 24px;
      padding: 32px 24px;
      text-align: center;
      transition: transform 0.3s, border-color 0.3s;
    }
    .partner-card:hover {
      transform: translateY(-4px);
      border-color: var(--partner-color, rgba(245,158,11,0.3));
    }
    .partner-avatar {
      width: 72px; height: 72px;
      border-radius: 50%;
      margin: 0 auto 16px;
      display: flex; align-items: center; justify-content: center;
      font-size: 32px; font-weight: 900;
      color: #0c0a07;
    }
    .partner-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
    .partner-card .partner-role {
      font-size: 13px; font-weight: 600; margin-bottom: 12px;
    }
    .partner-card p {
      font-size: 13px; color: rgba(255,255,255,0.45);
      line-height: 1.6;
    }
    .partner-tags {
      display: flex; gap: 6px; justify-content: center;
      flex-wrap: wrap;
      margin-top: 16px;
    }
    .partner-tag {
      font-size: 11px; font-weight: 600;
      padding: 4px 10px;
      border-radius: 6px;
      background: rgba(255,255,255,0.05);
      color: rgba(255,255,255,0.5);
    }

    /* ========== HOW IT WORKS ========== */
    .how-it-works {
      padding: 120px 0;
      position: relative;
    }
    .how-header { text-align: center; margin-bottom: 80px; }
    .how-header .section-desc { margin: 0 auto; }
    .steps {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
      position: relative;
    }
    .steps::before {
      content: '';
      position: absolute;
      top: 48px; left: 16%;
      width: 68%; height: 2px;
      background: linear-gradient(90deg, #F59E0B, #F97316, #EF4444);
      opacity: 0.2;
    }
    .step {
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 96px; height: 96px;
      border-radius: 50%;
      margin: 0 auto 24px;
      display: flex; align-items: center; justify-content: center;
      font-size: 36px; font-weight: 900;
      position: relative;
      z-index: 1;
    }
    .step-num::before {
      content: '';
      position: absolute; inset: -4px;
      border-radius: 50%;
      border: 2px solid;
      opacity: 0.15;
    }
    .step h3 { font-size: 22px; font-weight: 700; margin-bottom: 10px; }
    .step p { font-size: 15px; color: rgba(255,255,255,0.5); line-height: 1.7; max-width: 280px; margin: 0 auto; }

    /* ========== VOCAB SHOWCASE ========== */
    .vocab-section {
      padding: 120px 0;
      position: relative;
      overflow: hidden;
    }
    .vocab-section .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 80px;
      align-items: center;
    }
    .vocab-visual {
      position: relative;
    }
    .flashcard-stack {
      position: relative;
      width: 340px;
      height: 220px;
      margin: 0 auto;
    }
    .flashcard {
      position: absolute;
      width: 100%;
      background: linear-gradient(145deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 20px;
      padding: 28px;
    }
    .flashcard:nth-child(1) {
      z-index: 3;
      transform: rotate(-1deg);
    }
    .flashcard:nth-child(2) {
      z-index: 2;
      transform: rotate(2deg) translateY(12px) translateX(8px);
      opacity: 0.6;
    }
    .flashcard:nth-child(3) {
      z-index: 1;
      transform: rotate(-3deg) translateY(24px) translateX(-6px);
      opacity: 0.3;
    }
    .flashcard-word {
      font-size: 28px; font-weight: 800;
      margin-bottom: 4px;
    }
    .flashcard-phonetic {
      font-size: 14px;
      color: rgba(255,255,255,0.4);
      margin-bottom: 12px;
    }
    .flashcard-def {
      font-size: 16px;
      color: rgba(255,255,255,0.7);
      line-height: 1.5;
    }
    .flashcard-pos {
      display: inline-block;
      background: rgba(245,158,11,0.12);
      color: #F59E0B;
      font-size: 11px; font-weight: 600;
      padding: 3px 8px;
      border-radius: 6px;
      margin-bottom: 12px;
    }
    .vocab-features {
      display: flex;
      flex-direction: column;
      gap: 24px;
      margin-top: 32px;
    }
    .vocab-feat {
      display: flex; gap: 16px; align-items: flex-start;
    }
    .vocab-feat-icon {
      width: 40px; height: 40px; flex-shrink: 0;
      border-radius: 10px;
      background: rgba(245,158,11,0.1);
      display: flex; align-items: center; justify-content: center;
      font-size: 18px;
    }
    .vocab-feat h4 { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
    .vocab-feat p { font-size: 13px; color: rgba(255,255,255,0.45); line-height: 1.6; }

    /* ========== CTA ========== */
    .cta {
      padding: 120px 0;
      text-align: center;
      position: relative;
    }
    .cta-card {
      background: linear-gradient(145deg, rgba(245,158,11,0.08), rgba(249,115,22,0.04));
      border: 1px solid rgba(245,158,11,0.15);
      border-radius: 32px;
      padding: 80px 40px;
      position: relative;
      overflow: hidden;
    }
    .cta-card .glow {
      width: 400px; height: 400px;
      top: -200px; right: -100px;
    }
    .cta h2 {
      font-size: clamp(32px, 4vw, 48px);
      font-weight: 900;
      margin-bottom: 16px;
    }
    .cta p {
      font-size: 18px;
      color: rgba(255,255,255,0.55);
      max-width: 480px;
      margin: 0 auto 40px;
      line-height: 1.7;
    }
    .cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
    .download-badges { display: flex; gap: 16px; justify-content: center; margin-top: 32px; }
    .download-badge {
      display: inline-flex; align-items: center; gap: 10px;
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 12px;
      padding: 12px 20px;
      transition: border-color 0.2s;
    }
    .download-badge:hover { border-color: rgba(255,255,255,0.2); }
    .download-badge-text { text-align: left; }
    .download-badge-text small { font-size: 10px; color: rgba(255,255,255,0.4); display: block; }
    .download-badge-text span { font-size: 15px; font-weight: 700; }

    /* ========== FOOTER ========== */
    footer {
      padding: 48px 0;
      border-top: 1px solid rgba(255,255,255,0.06);
    }
    footer .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .footer-left { display: flex; align-items: center; gap: 8px; }
    .footer-logo { font-size: 20px; font-weight: 900; }
    .footer-copy { font-size: 13px; color: rgba(255,255,255,0.3); }
    .footer-links { display: flex; gap: 24px; }
    .footer-links a {
      font-size: 13px; color: rgba(255,255,255,0.4);
      transition: color 0.2s;
    }
    .footer-links a:hover { color: #F59E0B; }

    /* ========== ANIMATIONS ========== */
    .fade-in {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s, transform 0.7s;
    }
    .fade-in.visible {
      opacity: 1;
      transform: translateY(0);
    }
    .fade-in-delay-1 { transition-delay: 0.1s; }
    .fade-in-delay-2 { transition-delay: 0.2s; }
    .fade-in-delay-3 { transition-delay: 0.3s; }
    .fade-in-delay-4 { transition-delay: 0.4s; }

    /* ========== RESPONSIVE ========== */
    @media (max-width: 960px) {
      .hero .container { grid-template-columns: 1fr; text-align: center; }
      .hero p { margin: 0 auto 40px; }
      .hero-actions { justify-content: center; }
      .hero-visual { margin-top: 40px; }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .partners-grid { grid-template-columns: repeat(2, 1fr); }
      .vocab-section .container { grid-template-columns: 1fr; text-align: center; }
      .flashcard-stack { margin-bottom: 40px; }
      .vocab-feat { justify-content: center; }
      .stats-bar .container { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .nav-links { display: none; }
      .nav-mobile-btn { display: block; }
      .features-grid { grid-template-columns: 1fr; }
      .partners-grid { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr; gap: 48px; }
      .steps::before { display: none; }
      .stats-bar .container { grid-template-columns: repeat(2, 1fr); gap: 32px; }
      .phone-frame { width: 260px; height: 540px; }
      .orbit-ring { display: none; }
    }