/* NovelCaster Marketing Site — Design System */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700;800&family=Noto+Sans+JP:wght@400;500;700&family=Noto+Sans+KR:wght@400;500;700&family=Noto+Sans+Arabic:wght@400;500;700&display=swap');

/* ── Light Theme (default) ── */
:root {
  --color-primary: #667eea;
  --color-primary-dark: #5a6fd6;
  --color-accent: #764ba2;
  --color-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --color-gradient-soft: linear-gradient(135deg, rgba(102,126,234,.12) 0%, rgba(118,75,162,.12) 100%);

  --bg-body: #fafbfe;
  --bg-surface: #ffffff;
  --bg-surface-2: #f3f5fb;
  --bg-glass: rgba(255,255,255,.72);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --border-color: rgba(15,23,42,.08);
  --shadow-sm: 0 1px 3px rgba(15,23,42,.06);
  --shadow-md: 0 4px 24px rgba(15,23,42,.08);
  --shadow-lg: 0 12px 48px rgba(15,23,42,.12);
  --shadow-glow: 0 0 60px rgba(102,126,234,.18);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --header-height: 72px;
  --container-max: 1200px;
  --section-padding: clamp(64px, 8vw, 120px);

  --transition: .25s cubic-bezier(.4,0,.2,1);
  --font-sans: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'Noto Sans Arabic', system-ui, sans-serif;
}

/* ── Dark Theme ── */
[data-theme="dark"] {
  --bg-body: #0b0f1a;
  --bg-surface: #131825;
  --bg-surface-2: #1a2035;
  --bg-glass: rgba(19,24,37,.78);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --border-color: rgba(255,255,255,.08);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.3);
  --shadow-md: 0 4px 24px rgba(0,0,0,.4);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.5);
  --shadow-glow: 0 0 80px rgba(102,126,234,.25);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }

.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }

/* ── Typography helpers ── */
.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8125rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  color: var(--color-primary); margin-bottom: 16px;
}
.section-label::before { content: ''; width: 24px; height: 2px; background: var(--color-gradient); border-radius: 2px; }

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem); font-weight: 800; line-height: 1.15;
  letter-spacing: -.02em; margin-bottom: 16px;
}

.section-subtitle {
  font-size: clamp(1rem, 2vw, 1.125rem); color: var(--text-secondary); max-width: 640px; line-height: 1.7;
}

.text-gradient {
  background: var(--color-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; font-size: .9375rem; font-weight: 600;
  border-radius: var(--radius-full); transition: all var(--transition); white-space: nowrap;
}
.btn-primary { background: var(--color-gradient); color: var(--text-inverse); box-shadow: 0 4px 16px rgba(102,126,234,.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(102,126,234,.45); }
.btn-secondary { background: var(--bg-surface); color: var(--text-primary); border: 1.5px solid var(--border-color); }
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-2px); }
.btn-lg { padding: 16px 36px; font-size: 1rem; }

/* ── Header ── */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-height); transition: all var(--transition);
}
.header.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(1.4); -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--border-color); box-shadow: var(--shadow-sm);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-height); }

.logo { display: flex; align-items: center; gap: 12px; font-weight: 800; font-size: 1.25rem; letter-spacing: -.02em; }
.logo img { width: 40px; height: 40px; object-fit: contain; }

.nav-desktop { display: flex; align-items: center; gap: 32px; }
.nav-desktop a { font-size: .9375rem; font-weight: 500; color: var(--text-secondary); transition: color var(--transition); }
.nav-desktop a:hover { color: var(--color-primary); }

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

.icon-btn {
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full); background: var(--bg-surface-2);
  border: 1px solid var(--border-color); transition: all var(--transition);
}
.icon-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.icon-btn svg { width: 18px; height: 18px; }

.lang-select {
  appearance: none; padding: 8px 32px 8px 12px; font-size: .8125rem; font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--bg-surface-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center;
  border: 1px solid var(--border-color); color: var(--text-primary); cursor: pointer;
}
.lang-select:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }

.mobile-toggle { display: none; }

/* Mobile Nav */
.mobile-nav {
  display: none; position: fixed; inset: 0; z-index: 999;
  background: var(--bg-glass); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  padding: calc(var(--header-height) + 24px) 24px 24px; flex-direction: column; gap: 8px;
  transform: translateX(100%); transition: transform .35s cubic-bezier(.4,0,.2,1);
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav a { display: block; padding: 16px; font-size: 1.125rem; font-weight: 600; border-radius: var(--radius-md); transition: background var(--transition); }
.mobile-nav a:hover { background: var(--bg-surface-2); }

/* ── Hero ── */
.hero { position: relative; padding: calc(var(--header-height) + 80px) 0 var(--section-padding); overflow: hidden; }
.hero-bg { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.hero-bg::before {
  content: ''; position: absolute; top: -40%; right: -20%; width: 70%; height: 120%;
  background: radial-gradient(ellipse, rgba(102,126,234,.15) 0%, transparent 70%);
}
.hero-bg::after {
  content: ''; position: absolute; bottom: -30%; left: -10%; width: 50%; height: 80%;
  background: radial-gradient(ellipse, rgba(118,75,162,.1) 0%, transparent 70%);
}
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; position: relative; }
.hero-content { max-width: 560px; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px 6px 12px;
  background: var(--color-gradient-soft); border: 1px solid rgba(102,126,234,.2);
  border-radius: var(--radius-full); font-size: .8125rem; font-weight: 600; color: var(--color-primary); margin-bottom: 24px;
}
.hero-badge-dot { width: 8px; height: 8px; background: var(--color-primary); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: .5; transform: scale(1.3); } }

.hero-title { font-size: clamp(2.25rem, 5.5vw, 3.75rem); font-weight: 800; line-height: 1.08; letter-spacing: -.03em; margin-bottom: 24px; }
.hero-desc { font-size: clamp(1rem, 2vw, 1.25rem); color: var(--text-secondary); line-height: 1.7; margin-bottom: 36px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; }

.hero-visual { position: relative; }
.hero-visual img { width: 100%; border-radius: var(--radius-xl); box-shadow: var(--shadow-lg), var(--shadow-glow); }
.hero-visual::before {
  content: ''; position: absolute; inset: -2px; border-radius: calc(var(--radius-xl) + 2px);
  background: var(--color-gradient); z-index: -1; opacity: .3;
}

/* Stats Bar */
.stats-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding: 32px 0; border-top: 1px solid var(--border-color); margin-top: 48px; }
.stat-item { text-align: center; }
.stat-value {
  font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 800;
  background: var(--color-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-label { font-size: .875rem; color: var(--text-muted); margin-top: 4px; }

/* ── Section common ── */
.section { padding: var(--section-padding) 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header .section-subtitle { margin: 0 auto; }

/* ── Features Grid ── */
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card {
  background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-lg);
  padding: 32px 24px; transition: all var(--transition); position: relative; overflow: hidden;
}
.feature-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--color-gradient); opacity: 0; transition: opacity var(--transition); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(102,126,234,.25); }
.feature-card:hover::before { opacity: 1; }
.feature-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: var(--color-gradient-soft); border-radius: var(--radius-md); margin-bottom: 20px; color: var(--color-primary); }
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 { font-size: 1.0625rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: .875rem; color: var(--text-secondary); line-height: 1.6; }

/* ── Workflow ── */
.workflow { background: var(--bg-surface-2); }
.workflow-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; position: relative; }
.workflow-steps::before { content: ''; position: absolute; top: 36px; left: 10%; right: 10%; height: 2px; background: var(--color-gradient); opacity: .3; }
.workflow-step { text-align: center; position: relative; }
.step-number {
  width: 72px; height: 72px; margin: 0 auto 20px; display: flex; align-items: center; justify-content: center;
  background: var(--bg-surface); border: 2px solid var(--color-primary); border-radius: 50%;
  font-size: 1.5rem; font-weight: 800; color: var(--color-primary); position: relative; z-index: 1; box-shadow: var(--shadow-md);
}
.workflow-step h3 { font-size: .9375rem; font-weight: 700; margin-bottom: 8px; }
.workflow-step p { font-size: .8125rem; color: var(--text-secondary); line-height: 1.5; }
.workflow-visual { margin-top: 64px; border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-lg); }
.workflow-visual img { width: 100%; }

/* ── Showcase ── */
.showcase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.showcase-item { position: relative; border-radius: var(--radius-lg); overflow: hidden; aspect-ratio: 16/10; cursor: pointer; }
.showcase-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s cubic-bezier(.4,0,.2,1); }
.showcase-item:hover img { transform: scale(1.06); }
.showcase-overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.7) 0%, transparent 50%); display: flex; align-items: flex-end; padding: 24px; opacity: 0; transition: opacity var(--transition); }
.showcase-item:hover .showcase-overlay { opacity: 1; }
.showcase-overlay span { color: #fff; font-weight: 600; font-size: .9375rem; }

/* ── Advantages ── */
.advantages-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.advantage-card { padding: 40px 32px; background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-lg); text-align: center; transition: all var(--transition); }
.advantage-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.advantage-metric { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; background: var(--color-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 8px; }
.advantage-card h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 12px; }
.advantage-card p { font-size: .875rem; color: var(--text-secondary); line-height: 1.6; }

/* ── Use Cases ── */
.usecases-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.usecase-card { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 28px 20px; text-align: center; transition: all var(--transition); }
.usecase-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.usecase-icon { width: 56px; height: 56px; margin: 0 auto 16px; display: flex; align-items: center; justify-content: center; background: var(--color-gradient-soft); border-radius: var(--radius-md); color: var(--color-primary); }
.usecase-icon svg { width: 28px; height: 28px; }
.usecase-card h3 { font-size: .9375rem; font-weight: 700; margin-bottom: 8px; }
.usecase-card p { font-size: .8125rem; color: var(--text-secondary); line-height: 1.5; }

/* ── Pricing ── */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: start; }
.pricing-card { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-xl); padding: 40px 32px; transition: all var(--transition); position: relative; }
.pricing-card.featured { border-color: var(--color-primary); box-shadow: var(--shadow-lg), var(--shadow-glow); transform: scale(1.04); }
.pricing-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); padding: 4px 16px; background: var(--color-gradient); color: #fff; font-size: .75rem; font-weight: 700; border-radius: var(--radius-full); letter-spacing: .04em; text-transform: uppercase; }
.pricing-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 8px; }
.pricing-desc { font-size: .875rem; color: var(--text-muted); margin-bottom: 24px; }
.pricing-price { font-size: 2.5rem; font-weight: 800; margin-bottom: 4px; }
.pricing-price span { font-size: 1rem; font-weight: 500; color: var(--text-muted); }
.pricing-features { margin: 32px 0; display: flex; flex-direction: column; gap: 12px; }
.pricing-features li { display: flex; align-items: flex-start; gap: 10px; font-size: .875rem; color: var(--text-secondary); }
.pricing-features li svg { width: 18px; height: 18px; color: var(--color-primary); flex-shrink: 0; margin-top: 2px; }
.pricing-card .btn { width: 100%; }

/* ── FAQ ── */
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-md); overflow: hidden; transition: border-color var(--transition); }
.faq-item.open { border-color: rgba(102,126,234,.3); }
.faq-question { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 24px; font-size: 1rem; font-weight: 600; text-align: start; transition: color var(--transition); }
.faq-question:hover { color: var(--color-primary); }
.faq-question svg { width: 20px; height: 20px; flex-shrink: 0; transition: transform var(--transition); color: var(--text-muted); }
.faq-item.open .faq-question svg { transform: rotate(180deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .35s ease; }
.faq-item.open .faq-answer { max-height: 320px; padding: 0 24px 20px; }
.faq-answer p { font-size: .9375rem; color: var(--text-secondary); line-height: 1.7; }

/* ── CTA Banner ── */
.cta-banner { padding: var(--section-padding) 0; }
.cta-inner { background: var(--color-gradient); border-radius: var(--radius-xl); padding: clamp(48px, 6vw, 80px) clamp(32px, 5vw, 64px); text-align: center; position: relative; overflow: hidden; }
.cta-inner::before {
  content: ''; position: absolute; inset: 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='0.05'%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");
}
.cta-inner h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 800; color: #fff; margin-bottom: 16px; position: relative; }
.cta-inner p { font-size: 1.125rem; color: rgba(255,255,255,.85); margin: 0 auto 32px; max-width: 560px; position: relative; }
.cta-inner .btn { position: relative; background: #fff; color: var(--color-primary); box-shadow: 0 4px 20px rgba(0,0,0,.15); }
.cta-inner .btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,.2); }

/* ── Footer ── */
.footer { background: var(--bg-surface); border-top: 1px solid var(--border-color); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { font-size: .875rem; color: var(--text-muted); margin-top: 16px; line-height: 1.7; max-width: 320px; }
.footer-col h4 { font-size: .8125rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); margin-bottom: 20px; }
.footer-col a { display: block; font-size: .875rem; color: var(--text-secondary); padding: 6px 0; transition: color var(--transition); }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; padding-top: 32px; border-top: 1px solid var(--border-color); font-size: .8125rem; color: var(--text-muted); }
.footer-beian { text-align: center; margin-top: 24px; font-size: .75rem; line-height: 1.8; color: var(--text-muted); }
.footer-beian p { margin: 4px 0; }
.footer-beian .beian-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 16px; }
.footer-beian .beian-report { display: inline-flex; align-items: center; gap: 6px; }
.footer-beian img { width: 14px; height: 14px; flex: 0 0 auto; vertical-align: middle; }
.footer-beian a { color: inherit; text-decoration: none; transition: color var(--transition); }
.footer-beian a:hover { color: var(--color-primary); }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; border-radius: var(--radius-full); background: var(--bg-surface-2); border: 1px solid var(--border-color); transition: all var(--transition); }
.footer-social a:hover { border-color: var(--color-primary); color: var(--color-primary); }
.footer-social svg { width: 16px; height: 16px; }

/* ── Scroll Animations ── */
.reveal { opacity: 0; transform: translateY(32px); transition: opacity .7s cubic-bezier(.4,0,.2,1), transform .7s cubic-bezier(.4,0,.2,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }

/* ── RTL Support ── */
[dir="rtl"] .lang-select { background-position: left 10px center; padding: 8px 12px 8px 32px; }
[dir="rtl"] .pricing-features li { flex-direction: row-reverse; text-align: right; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .workflow-steps { grid-template-columns: repeat(3, 1fr); gap: 32px; }
  .workflow-steps::before { display: none; }
  .usecases-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-desktop { display: none; }
  .header-actions .btn-primary { display: none; }
  .mobile-toggle { display: flex; }
  .mobile-nav { display: flex; }

  .hero-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .hero-content { max-width: 100%; margin: 0 auto; }
  .hero-cta { justify-content: center; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); gap: 16px; }

  .features-grid { grid-template-columns: 1fr; }
  .workflow-steps { grid-template-columns: 1fr; }
  .showcase-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr; }
  .usecases-grid { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
  .pricing-card.featured { transform: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

@media (max-width: 480px) {
  .usecases-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
}