/* ========================================
   Insight Translate - Landing Page v2
   Modern, Premium Design
   ======================================== */

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --color-primary: #0f172a;
  --color-primary-dark: #020617;
  --color-accent: #3b82f6;
  --color-accent-light: #60a5fa;
  --color-accent-glow: rgba(59, 130, 246, 0.15);
  --color-accent-2: #8b5cf6;
  --color-accent-3: #06b6d4;
  --color-surface: #f8fafc;
  --color-surface-2: #f1f5f9;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-white: #ffffff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  --gradient-accent: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --gradient-accent-2: linear-gradient(135deg, #06b6d4, #3b82f6);
  --gradient-card: linear-gradient(135deg, rgba(59,130,246,0.05), rgba(139,92,246,0.05));
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --shadow-glow: 0 0 40px rgba(59,130,246,0.2);
  --font: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); color: var(--color-text); background: var(--color-white); line-height: 1.8; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; overflow-x: hidden; }
img { max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
em { font-style: normal; background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 32px; }

.section-title { font-size: 2.4rem; font-weight: 900; text-align: center; margin-bottom: 16px; letter-spacing: -0.03em; line-height: 1.3; }
.section-subtitle { text-align: center; color: var(--color-text-muted); font-size: 1.05rem; margin-bottom: 56px; line-height: 1.9; max-width: 640px; margin-left: auto; margin-right: auto; }

/* --- Buttons --- */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 32px; border-radius: 100px; font-weight: 700; font-size: 0.95rem; border: 2px solid transparent; cursor: pointer; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); white-space: nowrap; position: relative; overflow: hidden; }
.btn--primary { background: var(--gradient-accent); color: var(--color-white); border: none; box-shadow: 0 4px 16px rgba(59,130,246,0.3); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(59,130,246,0.4); }
.btn--outline { background: transparent; color: var(--color-accent); border-color: var(--color-accent); }
.btn--outline:hover { background: var(--color-accent); color: var(--color-white); transform: translateY(-2px); }
.btn--ghost { background: rgba(255,255,255,0.1); color: var(--color-white); border-color: rgba(255,255,255,0.2); backdrop-filter: blur(10px); }
.btn--ghost:hover { background: rgba(255,255,255,0.2); border-color: rgba(255,255,255,0.4); }
.btn--white { background: var(--color-white); color: var(--color-primary); border-color: var(--color-white); box-shadow: var(--shadow-md); }
.btn--white:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn--ghost-white { background: transparent; color: var(--color-white); border-color: rgba(255,255,255,0.3); }
.btn--ghost-white:hover { border-color: var(--color-white); background: rgba(255,255,255,0.1); }
.btn--lg { padding: 18px 40px; font-size: 1.05rem; }
.btn--full { width: 100%; }

/* --- Header --- */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.8); backdrop-filter: blur(20px) saturate(180%); border-bottom: 1px solid transparent; transition: all 0.3s ease; }
.header--scrolled { border-bottom-color: var(--color-border); box-shadow: 0 1px 12px rgba(0,0,0,0.05); }
.header__inner { display: flex; align-items: center; height: 72px; gap: 32px; }
.header__logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.header__logo-mark { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; background: var(--gradient-accent); color: var(--color-white); font-weight: 900; font-size: 1.1rem; border-radius: 10px; }
.header__logo-text { font-weight: 800; font-size: 1rem; color: var(--color-primary); letter-spacing: -0.02em; }
.header__logo-sub { font-weight: 400; color: var(--color-text-muted); }
.header__nav { display: flex; gap: 32px; margin-left: auto; }
.header__nav a { font-size: 0.9rem; font-weight: 500; color: var(--color-text-muted); transition: color 0.2s; position: relative; }
.header__nav a:hover { color: var(--color-accent); }
.header__nav a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--gradient-accent); transition: width 0.3s; border-radius: 1px; }
.header__nav a:hover::after { width: 100%; }
.header__actions { display: flex; gap: 12px; margin-left: 16px; }
.header__mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.header__mobile-toggle span { display: block; width: 20px; height: 2px; background: var(--color-text); margin: 4px 0; transition: 0.3s; border-radius: 1px; }

/* --- Hero --- */
.hero { padding: 120px 0 100px; background: var(--gradient-hero); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; right: -20%; width: 800px; height: 800px; background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, transparent 70%); pointer-events: none; }
.hero::after { content: ''; position: absolute; bottom: -30%; left: -10%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(139,92,246,0.1) 0%, transparent 70%); pointer-events: none; }
.hero__inner { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; position: relative; z-index: 1; }
.hero__label { display: inline-flex; align-items: center; gap: 8px; font-size: 0.85rem; font-weight: 600; color: var(--color-accent-light); background: rgba(59,130,246,0.1); padding: 8px 20px; border-radius: 100px; border: 1px solid rgba(59,130,246,0.2); margin-bottom: 24px; }
.hero__title { font-size: 3rem; font-weight: 900; line-height: 1.25; margin-bottom: 24px; letter-spacing: -0.03em; color: var(--color-white); }
.hero__title em { background: var(--gradient-accent-2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero__subtitle { font-size: 1.1rem; color: var(--color-text-light); margin-bottom: 36px; line-height: 1.9; }
.hero__subtitle strong { color: var(--color-accent-light); }
.hero__cta { display: flex; gap: 16px; margin-bottom: 20px; }
.hero__note { font-size: 0.8rem; color: var(--color-text-light); opacity: 0.7; }

/* Mockup */
.hero__mockup { perspective: 1200px; }
.mockup__window { background: rgba(30, 41, 59, 0.8); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow-xl), var(--shadow-glow); border: 1px solid rgba(255,255,255,0.08); backdrop-filter: blur(20px); }
.mockup__titlebar { display: flex; align-items: center; gap: 8px; padding: 14px 18px; background: rgba(15, 23, 42, 0.6); border-bottom: 1px solid rgba(255,255,255,0.05); }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot--red { background: #ff5f57; }
.dot--yellow { background: #ffbd2e; }
.dot--green { background: #28c840; }
.mockup__title { margin-left: 12px; color: rgba(255,255,255,0.4); font-size: 0.8rem; }
.mockup__body { display: flex; align-items: center; justify-content: center; gap: 24px; padding: 48px 36px; }
.mockup__step { text-align: center; }
.mockup__icon { font-size: 2.5rem; margin-bottom: 10px; filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2)); }
.mockup__label { color: rgba(255,255,255,0.6); font-size: 0.85rem; font-weight: 500; }
.mockup__arrow { color: var(--color-accent); font-size: 1.5rem; font-weight: 700; }

/* --- Social Proof --- */
.social-proof { padding: 56px 0; background: var(--color-white); border-bottom: 1px solid var(--color-border); }
.social-proof__text { text-align: center; font-size: 0.9rem; color: var(--color-text-muted); margin-bottom: 36px; }
.social-proof__stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat { padding: 16px; }
.stat__number { display: block; font-size: 3rem; font-weight: 900; background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1.2; }
.stat__number small { font-size: 1.4rem; }
.stat__label { font-size: 0.85rem; color: var(--color-text-muted); margin-top: 4px; }

/* --- Regulation Banner --- */
.regulation { padding: 80px 0; background: var(--gradient-hero); color: var(--color-white); position: relative; overflow: hidden; }
.regulation::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); }
.regulation__inner { text-align: center; position: relative; z-index: 1; }
.regulation__badge { display: inline-flex; align-items: center; gap: 6px; background: var(--color-danger); color: white; padding: 8px 24px; border-radius: 100px; font-weight: 700; font-size: 0.85rem; margin-bottom: 20px; box-shadow: 0 4px 16px rgba(239,68,68,0.3); }
.regulation__title { font-size: 2rem; font-weight: 900; margin-bottom: 16px; letter-spacing: -0.02em; }
.regulation__text { font-size: 1rem; opacity: 0.8; line-height: 1.8; margin-bottom: 40px; max-width: 700px; margin-left: auto; margin-right: auto; }
.regulation__stats { display: flex; justify-content: center; gap: 60px; }
.regulation__stat { text-align: center; padding: 24px 32px; background: rgba(255,255,255,0.05); border-radius: var(--radius-lg); border: 1px solid rgba(255,255,255,0.08); backdrop-filter: blur(10px); }
.regulation__stat strong { display: block; font-size: 2rem; background: var(--gradient-accent-2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; font-weight: 900; }
.regulation__stat span { font-size: 0.85rem; opacity: 0.7; }

/* --- Problems --- */
.problems { padding: 100px 0; background: var(--color-surface); }
.problems__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.problem-card { background: var(--color-white); border-radius: var(--radius-lg); padding: 36px; border: 1px solid var(--color-border); transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); position: relative; overflow: hidden; }
.problem-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-accent); opacity: 0; transition: opacity 0.3s; }
.problem-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.problem-card:hover::before { opacity: 1; }
.problem-card__icon { width: 56px; height: 56px; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; margin-bottom: 20px; }
.icon-circle { display: inline-flex; align-items: center; justify-content: center; width: 48px; height: 48px; background: var(--gradient-accent); color: var(--color-white); font-weight: 900; font-size: 1.1rem; border-radius: 14px; box-shadow: 0 4px 16px rgba(59,130,246,0.25); }
.problem-card h3 { font-size: 1.15rem; font-weight: 800; margin-bottom: 12px; line-height: 1.5; letter-spacing: -0.01em; }
.problem-card p { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.8; }

/* --- Solution Intro --- */
.solution-intro { padding: 80px 0 40px; }

/* --- Features --- */
.features { padding: 40px 0 100px; }
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; margin-bottom: 80px; }
.feature-row:last-child { margin-bottom: 0; }
.feature-row--reverse { direction: rtl; }
.feature-row--reverse > * { direction: ltr; }
.feature-row__badge { display: inline-block; background: var(--gradient-accent); color: white; padding: 6px 16px; border-radius: 100px; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em; margin-bottom: 20px; }
.feature-row__title { font-size: 1.7rem; font-weight: 900; margin-bottom: 16px; line-height: 1.35; letter-spacing: -0.02em; }
.feature-row__content p { color: var(--color-text-muted); line-height: 1.9; }
.feature-demo { background: var(--color-primary); border-radius: var(--radius-lg); padding: 36px; border: 1px solid rgba(255,255,255,0.06); box-shadow: var(--shadow-lg); }
.feature-demo__file, .feature-demo__result { background: rgba(255,255,255,0.06); padding: 14px 18px; border-radius: var(--radius); color: rgba(255,255,255,0.6); font-size: 0.9rem; border: 1px solid rgba(255,255,255,0.04); }
.feature-demo__result { color: var(--color-accent-light); border-color: rgba(59,130,246,0.15); background: rgba(59,130,246,0.08); }
.feature-demo__arrow { text-align: center; padding: 10px; color: var(--color-accent); font-size: 1.2rem; }
.feature-demo__time { text-align: center; margin-top: 14px; color: var(--color-success); font-size: 0.8rem; font-weight: 700; }
.feature-demo__langs { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.lang-tag { background: rgba(255,255,255,0.06); padding: 10px 18px; border-radius: 100px; color: rgba(255,255,255,0.7); font-size: 0.85rem; border: 1px solid rgba(255,255,255,0.06); transition: all 0.3s; }
.lang-tag:hover { background: rgba(59,130,246,0.1); border-color: rgba(59,130,246,0.2); color: var(--color-accent-light); }
.lang-tag--more { border-style: dashed; border-color: rgba(255,255,255,0.15); color: rgba(255,255,255,0.4); }
.feature-demo__batch { display: flex; flex-direction: column; gap: 10px; }
.batch-item { background: rgba(255,255,255,0.06); padding: 12px 18px; border-radius: var(--radius); color: rgba(255,255,255,0.6); font-size: 0.85rem; border: 1px solid rgba(255,255,255,0.04); transition: all 0.3s; }
.batch-item:hover { background: rgba(255,255,255,0.08); }
.batch-item--processing { color: var(--color-warning); border-left: 3px solid var(--color-warning); }
.batch-item--pending { color: rgba(255,255,255,0.3); }

/* --- Steps --- */
.steps { padding: 100px 0; background: var(--color-surface); }
.steps__grid { display: flex; align-items: flex-start; justify-content: center; gap: 0; }
.step-card { background: var(--color-white); border-radius: var(--radius-lg); padding: 40px 32px; text-align: center; flex: 1; max-width: 320px; border: 1px solid var(--color-border); transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); }
.step-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.step-card__num { display: inline-flex; align-items: center; justify-content: center; width: 52px; height: 52px; background: var(--gradient-accent); color: white; border-radius: 16px; font-size: 1.2rem; font-weight: 900; margin-bottom: 20px; box-shadow: 0 4px 16px rgba(59,130,246,0.25); }
.step-card h3 { font-size: 1.15rem; font-weight: 800; margin-bottom: 12px; }
.step-card p { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.8; }
.step-card__connector { width: 60px; height: 2px; background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2)); margin-top: 64px; flex-shrink: 0; border-radius: 1px; opacity: 0.4; }

/* --- Use Cases --- */
.usecases { padding: 100px 0; }
.usecases__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.usecase-card { background: var(--color-white); border-radius: var(--radius-lg); padding: 36px 28px; text-align: center; border: 1px solid var(--color-border); transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); position: relative; overflow: hidden; }
.usecase-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.usecase-card__icon { width: 64px; height: 64px; display: flex; align-items: center; justify-content: center; font-size: 2rem; background: var(--gradient-card); border-radius: var(--radius-lg); margin: 0 auto 20px; }
.usecase-card h3 { font-size: 1.05rem; font-weight: 800; margin-bottom: 12px; }
.usecase-card p { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.8; }

/* --- Comparison --- */
.comparison { padding: 100px 0; background: var(--color-surface); }
.comparison__table-wrap { overflow-x: auto; max-width: 800px; margin: 0 auto; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); }
.comparison__table { width: 100%; border-collapse: collapse; background: var(--color-white); overflow: hidden; }
.comparison__table th, .comparison__table td { padding: 18px 24px; text-align: center; border-bottom: 1px solid var(--color-border-light); font-size: 0.9rem; }
.comparison__table thead th { background: var(--color-primary); color: white; font-weight: 700; font-size: 0.9rem; }
.comparison__th--self { background: var(--color-accent) !important; }
.comparison__feature { text-align: left !important; font-weight: 600; }
.comparison__self { background: rgba(59, 130, 246, 0.04); color: var(--color-accent); }
.comparison__self strong { font-weight: 800; }

/* --- Pricing (hidden) --- */
.pricing { display: none; }

/* --- CTA --- */
.cta-section { padding: 100px 0; background: var(--gradient-hero); color: var(--color-white); text-align: center; position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, transparent 70%); }
.cta-section__inner { position: relative; z-index: 1; }
.cta-section h2 { font-size: 2.4rem; font-weight: 900; margin-bottom: 16px; letter-spacing: -0.03em; }
.cta-section h2 em { background: var(--gradient-accent-2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.cta-section p { font-size: 1.05rem; opacity: 0.8; margin-bottom: 40px; line-height: 1.9; }
.cta-section__buttons { display: flex; justify-content: center; gap: 16px; }

/* --- FAQ --- */
.faq { padding: 100px 0; background: var(--color-white); }
.faq__list { max-width: 760px; margin: 0 auto; }
.faq-item { background: var(--color-surface); border-radius: var(--radius); margin-bottom: 10px; border: 1px solid var(--color-border); transition: all 0.3s; overflow: hidden; }
.faq-item:hover { border-color: rgba(59,130,246,0.2); }
.faq-item[open] { border-color: rgba(59,130,246,0.3); box-shadow: 0 4px 16px rgba(59,130,246,0.06); }
.faq-item summary { padding: 22px 28px; font-weight: 700; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; font-size: 0.95rem; transition: color 0.2s; }
.faq-item summary:hover { color: var(--color-accent); }
.faq-item summary::after { content: "+"; font-size: 1.4rem; color: var(--color-accent); transition: transform 0.3s; font-weight: 300; }
.faq-item[open] summary::after { content: "\2212"; transform: rotate(180deg); }
.faq-item p { padding: 0 28px 22px; color: var(--color-text-muted); line-height: 1.9; font-size: 0.9rem; }

/* --- Contact --- */
.contact { padding: 100px 0; background: var(--color-surface); }
.contact__form { max-width: 640px; margin: 0 auto; background: var(--color-white); padding: 48px; border-radius: var(--radius-xl); box-shadow: var(--shadow-md); border: 1px solid var(--color-border); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 700; margin-bottom: 8px; color: var(--color-text); }
.required { color: var(--color-danger); font-size: 0.75rem; margin-left: 4px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 14px 18px; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-family: var(--font); font-size: 0.9rem; transition: all 0.2s; background: var(--color-surface); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 4px var(--color-accent-glow); background: var(--color-white); }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--color-text-light); }

/* --- Footer --- */
.footer { padding: 72px 0 32px; background: var(--color-primary-dark); color: rgba(255,255,255,0.6); }
.footer__inner { display: flex; flex-wrap: wrap; gap: 48px; }
.footer__brand { flex: 1; min-width: 200px; }
.footer__brand .header__logo-mark { background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.06); }
.footer__brand .header__logo-text { color: white; }
.footer__copy { margin-top: 16px; font-size: 0.85rem; opacity: 0.6; line-height: 1.7; }
.footer__links { display: flex; gap: 56px; flex: 2; }
.footer__col { min-width: 140px; }
.footer__col h4 { color: var(--color-white); font-size: 0.85rem; font-weight: 700; margin-bottom: 20px; }
.footer__col a { display: block; font-size: 0.8rem; padding: 5px 0; opacity: 0.6; transition: all 0.2s; }
.footer__col a:hover { opacity: 1; color: var(--color-accent-light); }
.footer__bottom { width: 100%; text-align: center; padding-top: 32px; margin-top: 40px; border-top: 1px solid rgba(255,255,255,0.06); font-size: 0.8rem; opacity: 0.4; }

/* --- Animations --- */
.anim-fade-up { opacity: 0; transform: translateY(40px); transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1); }
.anim-fade-up.is-visible { opacity: 1; transform: translateY(0); }

/* Stagger animation for grid items */
.problems__grid .anim-fade-up:nth-child(2) { transition-delay: 0.1s; }
.problems__grid .anim-fade-up:nth-child(3) { transition-delay: 0.2s; }
.problems__grid .anim-fade-up:nth-child(4) { transition-delay: 0.3s; }
.usecases__grid .anim-fade-up:nth-child(2) { transition-delay: 0.1s; }
.usecases__grid .anim-fade-up:nth-child(3) { transition-delay: 0.2s; }
.usecases__grid .anim-fade-up:nth-child(4) { transition-delay: 0.3s; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section-title { font-size: 1.8rem; }
  .section-subtitle { font-size: 0.95rem; margin-bottom: 40px; }
  .hero { padding: 100px 0 60px; }
  .hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .hero__title { font-size: 2.2rem; }
  .hero__cta { flex-direction: column; }
  .social-proof__stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat__number { font-size: 2.2rem; }
  .problems__grid { grid-template-columns: 1fr; }
  .feature-row, .feature-row--reverse { grid-template-columns: 1fr; direction: ltr; gap: 32px; }
  .steps__grid { flex-direction: column; align-items: center; }
  .step-card__connector { width: 2px; height: 30px; }
  .usecases__grid { grid-template-columns: 1fr 1fr; }
  .comparison__table-wrap { border-radius: var(--radius); }
  .regulation__stats { flex-direction: column; gap: 16px; }
  .regulation__stat { padding: 16px 24px; }
  .cta-section h2 { font-size: 1.8rem; }
  .cta-section__buttons { flex-direction: column; align-items: center; }
  .form-row { grid-template-columns: 1fr; }
  .contact__form { padding: 32px 24px; }
  .footer__links { flex-direction: column; gap: 24px; }
  .header__nav { display: none; position: absolute; top: 72px; left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); flex-direction: column; padding: 24px 32px; box-shadow: var(--shadow-lg); border-bottom: 1px solid var(--color-border); }
  .header__nav.is-open { display: flex; }
  .header__actions { display: none; }
  .header__mobile-toggle { display: block; margin-left: auto; }
}

@media (max-width: 480px) {
  .hero__title { font-size: 1.8rem; }
  .usecases__grid { grid-template-columns: 1fr; }
  .social-proof__stats { grid-template-columns: 1fr 1fr; }
}