@import url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css");

:root {
  --color-surface-background: #fff;
  --color-surface-elevated: #f9f9f9;
  --color-surface-muted: #ececec;
  --color-surface-sidebar: #f9f9f9;
  --color-surface-sidebar-hover: #ececec;
  --color-surface-sidebar-active: #e3e3e3;
  --color-surface-composer: #fff;
  --color-surface-user-message: #e9e9e980;
  --color-text-primary: #0d0d0d;
  --color-text-secondary: #5d5d5d;
  --color-text-tertiary: #8f8f8f;
  --color-text-placeholder: #000000b3;
  --color-text-link: #2964aa;
  --color-text-link-hover: #749ac8;
  --color-border-light: #0d0d0d0d;
  --color-border-default: #0d0d0d1a;
  --color-border-medium: #00000026;
  --color-border-heavy: #0d0d0d26;
  --color-icon-primary: #0d0d0d;
  --color-icon-secondary: #5d5d5d;
  --color-action-primary-bg: #000;
  --color-action-primary-fg: #fff;
  --color-action-primary-bg-hover: #0d0d0dcc;
  --color-action-secondary-bg: #ececec;
  --color-action-secondary-fg: #0d0d0d;
  --color-action-accent: #0169cc;
  --color-action-brand-purple: #ab68ff;
  --radius-xs: .125rem;
  --radius-sm: .25rem;
  --radius-md: .375rem;
  --radius-lg: .5rem;
  --radius-xl: .75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-4xl: 2rem;
  --radius-pill: 9999px;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-2xl: 24px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --font-sans: "-apple-system-body", "ui-sans-serif", "-apple-system", "system-ui", "Segoe UI", "Helvetica", "Arial", "sans-serif";
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  background: var(--color-surface-background);
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--color-text-link); text-decoration: none; }
a:hover { color: var(--color-text-link-hover); }

/* ── TOPBAR ── */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: var(--color-surface-background);
  border-bottom: 1px solid var(--color-border-default);
  z-index: 100;
  display: flex;
  align-items: center;
}

.topbar-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-svg { width: 28px; height: 28px; color: var(--color-text-primary); }
.logo-text { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); letter-spacing: -0.02em; }

nav { display: flex; align-items: center; flex: 1; }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  flex: 1;
}

.nav-links > li > a {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-lg);
  transition: color .15s, background .15s;
}
.nav-links > li > a:hover { color: var(--color-text-primary); background: var(--color-surface-muted); }
.nav-links > li > a.active { color: var(--color-text-primary); }

.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}
.lang-switcher a { color: var(--color-text-secondary); padding: 2px 6px; border-radius: var(--radius-md); }
.lang-switcher a:hover, .lang-switcher a.active { color: var(--color-text-primary); background: var(--color-surface-muted); }
.lang-sep { color: var(--color-border-medium); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) 14px;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: background .15s, opacity .15s;
  white-space: nowrap;
}
.btn-primary { background: var(--color-action-primary-bg); color: var(--color-action-primary-fg); }
.btn-primary:hover { background: var(--color-action-primary-bg-hover); color: var(--color-action-primary-fg); }
.btn-secondary { background: var(--color-action-secondary-bg); color: var(--color-action-secondary-fg); border: 1px solid var(--color-border-heavy); }
.btn-secondary:hover { background: var(--color-surface-muted); color: var(--color-text-primary); }
.btn-large { padding: 12px 24px; font-size: var(--font-size-md); }
.btn-ghost { background: transparent; color: var(--color-text-primary); border: 1px solid var(--color-border-heavy); }
.btn-ghost:hover { background: var(--color-surface-muted); }

/* ── HAMBURGER ── */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--color-text-primary);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  margin-left: auto;
}

/* ── PAGE WRAPPER ── */
.page-wrapper { padding-top: 56px; }

/* ── HERO ── */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 56px);
  text-align: center;
  padding: var(--space-12) var(--space-5);
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.hero-heading {
  font-size: clamp(32px, 6vw, 64px);
  font-weight: var(--font-weight-semibold);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  max-width: 800px;
  margin: 0 auto var(--space-5);
}

.hero-sub {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.6;
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: var(--space-10);
}

/* Composer pill (ChatGPT style) */
.composer-wrap {
  width: 100%;
  max-width: 672px;
  margin-bottom: var(--space-5);
}

.composer {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface-composer);
  border: 1px solid var(--color-border-heavy);
  border-radius: var(--radius-4xl);
  padding: 14px var(--space-5);
  box-shadow: 0 4px 80px 8px rgba(0,0,0,.04), 0 3px 6px rgba(0,0,0,.04), 0 0 1px rgba(0,0,0,.62);
  transition: box-shadow .15s;
}
.composer:focus-within { box-shadow: 0 4px 80px 8px rgba(0,0,0,.08), 0 3px 6px rgba(0,0,0,.06), 0 0 1px rgba(0,0,0,.62); }

.composer-input {
  flex: 1;
  border: none;
  outline: none;
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  background: transparent;
  min-width: 0;
}
.composer-input::placeholder { color: var(--color-text-placeholder); }

.composer-send {
  width: 36px; height: 36px;
  border-radius: var(--radius-pill);
  background: var(--color-action-primary-bg);
  color: var(--color-action-primary-fg);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  transition: opacity .15s;
  text-decoration: none;
}
.composer-send:hover { opacity: 0.8; color: var(--color-action-primary-fg); }

.composer-note {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  text-align: center;
}
.composer-note a { color: var(--color-text-link); }

/* ── SECTION ── */
.section { padding: 80px var(--space-5); }
.section-alt { background: var(--color-surface-elevated); }
.section-center { text-align: center; }

.section-tag {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-action-accent);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: clamp(24px, 4vw, 40px);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

.section-sub {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-10);
  line-height: 1.6;
}

.container { max-width: 1100px; margin: 0 auto; }
.container-narrow { max-width: 768px; margin: 0 auto; }

/* ── GRID ── */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }

/* ── CARD ── */
.card {
  background: var(--color-surface-background);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  transition: box-shadow .15s;
}
.card:hover { box-shadow: 0 4px 24px rgba(0,0,0,.07); }
.card-icon { font-size: 24px; margin-bottom: var(--space-4); color: var(--color-text-primary); }
.card-title { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); margin-bottom: var(--space-3); }
.card-text { font-size: var(--font-size-base); color: var(--color-text-secondary); line-height: 1.6; }

/* ── FEATURE ROW ── */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 80px var(--space-5);
  max-width: 1100px;
  margin: 0 auto;
}
.feature-row.reverse { direction: rtl; }
.feature-row.reverse > * { direction: ltr; }

.feature-text {}
.feature-eyebrow { font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); color: var(--color-action-accent); text-transform: uppercase; letter-spacing: .08em; margin-bottom: var(--space-3); }
.feature-title { font-size: clamp(22px, 3vw, 32px); font-weight: var(--font-weight-semibold); letter-spacing: -0.02em; line-height: 1.2; margin-bottom: var(--space-4); }
.feature-desc { font-size: var(--font-size-base); color: var(--color-text-secondary); line-height: 1.7; margin-bottom: var(--space-5); }
.feature-list { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.feature-list li { display: flex; align-items: flex-start; gap: var(--space-3); font-size: var(--font-size-base); color: var(--color-text-secondary); line-height: 1.5; }
.feature-list li::before { content: "✓"; color: var(--color-action-accent); font-weight: var(--font-weight-semibold); flex-shrink: 0; margin-top: 2px; }

.feature-visual {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  aspect-ratio: 4/3;
}
.feature-visual img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ── IMAGE STRIP ── */
.img-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
.img-strip img { width: 100%; aspect-ratio: 16/9; object-fit: cover; border-radius: var(--radius-xl); }

/* ── STATS ── */
.stats-row { display: flex; gap: var(--space-8); justify-content: center; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { font-size: clamp(28px, 5vw, 48px); font-weight: var(--font-weight-semibold); letter-spacing: -0.03em; }
.stat-label { font-size: var(--font-size-sm); color: var(--color-text-secondary); margin-top: var(--space-1); }

/* ── FAQ ── */
.faq-list { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.faq-item {
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  color: var(--color-text-primary);
  gap: var(--space-3);
}
.faq-q:hover { background: var(--color-surface-elevated); }
.faq-icon { flex-shrink: 0; transition: transform .2s; font-size: var(--font-size-sm); color: var(--color-text-tertiary); }
.faq-a {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  padding: 0 var(--space-5) var(--space-5);
  display: none;
}
.faq-item.open .faq-a { display: block; }
.faq-item.open .faq-icon { transform: rotate(180deg); }

/* ── CTA BANNER ── */
.cta-banner {
  background: var(--color-text-primary);
  color: var(--color-action-primary-fg);
  padding: 80px var(--space-5);
  text-align: center;
}
.cta-banner .section-title { color: #fff; }
.cta-banner .section-sub { color: rgba(255,255,255,.7); }
.cta-banner .btn-primary { background: #fff; color: #000; }
.cta-banner .btn-primary:hover { background: rgba(255,255,255,.9); }
.cta-banner .btn-secondary { border-color: rgba(255,255,255,.3); color: #fff; background: transparent; }
.cta-banner .btn-secondary:hover { background: rgba(255,255,255,.1); }

/* ── FOOTER ── */
footer {
  background: var(--color-surface-elevated);
  border-top: 1px solid var(--color-border-default);
  padding: 48px var(--space-5) var(--space-6);
}
.footer-inner { max-width: 1100px; margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-10); margin-bottom: 48px; }
.footer-brand .logo-link { margin-bottom: var(--space-3); display: inline-flex; }
.footer-brand p { font-size: var(--font-size-sm); color: var(--color-text-secondary); line-height: 1.6; max-width: 260px; }
.footer-col h4 { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); margin-bottom: var(--space-4); }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col ul li a { font-size: var(--font-size-sm); color: var(--color-text-secondary); }
.footer-col ul li a:hover { color: var(--color-text-primary); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-3); padding-top: var(--space-6); border-top: 1px solid var(--color-border-default); }
.footer-bottom p { font-size: var(--font-size-xs); color: var(--color-text-tertiary); }

/* ── PAGE HERO (inner pages) ── */
.page-hero {
  padding: 80px var(--space-5) 60px;
  text-align: center;
  background: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border-default);
}
.page-hero .hero-heading { font-size: clamp(28px, 5vw, 52px); }

/* ── PROSE ── */
.prose { max-width: 768px; margin: 0 auto; padding: 60px var(--space-5); }
.prose h2 { font-size: clamp(20px, 3vw, 28px); font-weight: var(--font-weight-semibold); letter-spacing: -0.02em; margin: var(--space-8) 0 var(--space-4); }
.prose h3 { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); margin: var(--space-6) 0 var(--space-3); }
.prose p { font-size: var(--font-size-base); color: var(--color-text-secondary); line-height: 1.8; margin-bottom: var(--space-4); }
.prose ul, .prose ol { padding-left: var(--space-5); margin-bottom: var(--space-4); }
.prose li { font-size: var(--font-size-base); color: var(--color-text-secondary); line-height: 1.8; margin-bottom: var(--space-2); }
.prose strong { color: var(--color-text-primary); font-weight: var(--font-weight-semibold); }
.prose a { color: var(--color-text-link); }

/* ── KEYWORD CHIPS ── */
.keyword-cloud { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: var(--space-6) 0; }
.keyword-chip {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ── PRICING ── */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.pricing-card {
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  background: var(--color-surface-background);
  position: relative;
}
.pricing-card.featured { border-color: var(--color-text-primary); }
.pricing-badge {
  position: absolute;
  top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--color-text-primary); color: #fff;
  border-radius: var(--radius-pill);
  padding: 4px 14px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
}
.pricing-plan { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); text-transform: uppercase; letter-spacing: .1em; color: var(--color-text-secondary); margin-bottom: var(--space-3); }
.pricing-price { font-size: 40px; font-weight: var(--font-weight-semibold); letter-spacing: -0.03em; margin-bottom: var(--space-1); }
.pricing-price sup { font-size: var(--font-size-md); font-weight: var(--font-weight-medium); vertical-align: super; }
.pricing-period { font-size: var(--font-size-sm); color: var(--color-text-secondary); margin-bottom: var(--space-5); }
.pricing-features { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); margin-bottom: var(--space-6); }
.pricing-features li { display: flex; align-items: flex-start; gap: var(--space-2); font-size: var(--font-size-sm); color: var(--color-text-secondary); }
.pricing-features li::before { content: "✓"; color: var(--color-action-accent); font-weight: var(--font-weight-semibold); flex-shrink: 0; }

/* ── NOTICE BOX ── */
.notice {
  background: #fff7ed;
  border: 1px solid #fdba74;
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  margin: var(--space-6) 0;
  font-size: var(--font-size-base);
  color: #9a3412;
  line-height: 1.6;
}
.notice strong { color: #7c2d12; }

/* ── MOBILE ── */
@media (max-width: 767px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: fixed;
    top: 56px; left: 0; right: 0;
    background: var(--color-surface-background);
    border-bottom: 1px solid var(--color-border-default);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    gap: var(--space-1);
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links > li { width: 100%; }
  .nav-links > li > a { display: block; padding: var(--space-3) var(--space-3); border-radius: var(--radius-lg); }
  .nav-right { flex-direction: column; align-items: stretch; gap: var(--space-3); padding-top: var(--space-3); border-top: 1px solid var(--color-border-default); margin-top: var(--space-2); }
  .lang-switcher { justify-content: center; }

  .topbar-inner > .nav-actions { display: none; }

  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
  .feature-row, .feature-row.reverse { grid-template-columns: 1fr; direction: ltr; gap: var(--space-6); }
  .pricing-grid { grid-template-columns: 1fr; }
  .img-strip { grid-template-columns: 1fr; }
  .stats-row { gap: var(--space-6); }
  .hero-actions { flex-direction: column; align-items: center; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (min-width: 768px) {
  .nav-links { display: flex !important; }
  .nav-links .nav-right { display: none; }
  .topbar-inner > .nav-actions { display: flex; gap: var(--space-2); align-items: center; }
}