/* ================================================
   Timingle Corporate Site — Main Stylesheet
   Brand: Deep Teal #0D9488 + Warm Amber #E8910C (v5)
   Typography: Outfit (en) + Pretendard (ko)
   ================================================ */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* Brand Palette */
  --color-primary: #0D9488;
  --color-primary-dark: #0B7A70;
  --color-primary-light: #14B8A6;
  --color-accent: #E8910C;
  --color-accent-dark: #C97A05;

  /* Neutral */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFB;
  --color-bg-elev: #FFFFFF;
  --color-border: #E5E7EB;
  --color-text: #111827;
  --color-text-muted: #4B5563;
  --color-text-subtle: #6B7280;
  --color-text-inverse: #FFFFFF;

  /* Semantic — link uses primary-dark for AA contrast on white */
  --color-link: var(--color-primary-dark);
  --color-link-hover: #064E48;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.04);
  --shadow-md: 0 4px 12px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 12px 32px rgba(13, 148, 136, 0.16);

  /* Layout */
  --container-max: 1180px;
  --container-prose: 760px;

  /* Font Stacks */
  --font-sans: "Outfit", "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Apple SD Gothic Neo", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0B1116;
    --color-bg-alt: #111B22;
    --color-bg-elev: #16222B;
    --color-border: #1F2D38;
    --color-text: #F1F5F9;
    --color-text-muted: #CBD5E1;
    --color-text-subtle: #94A3B8;
    --color-text-inverse: #0B1116;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  }
}

/* ---------- 2. Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--color-link); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--color-link-hover); text-decoration: underline; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; margin: 0 0 var(--space-4); font-weight: 700; }
h1 { font-size: 2.25rem; letter-spacing: -0.02em; }
h2 { font-size: 1.625rem; letter-spacing: -0.015em; }
h3 { font-size: 1.25rem; }
p { margin: 0 0 var(--space-4); }
ul, ol { padding-left: 1.5rem; margin: 0 0 var(--space-4); }
li { margin-bottom: var(--space-2); }
hr { border: 0; border-top: 1px solid var(--color-border); margin: var(--space-7) 0; }
code { font-family: var(--font-mono); font-size: 0.9em; background: var(--color-bg-alt); padding: 2px 6px; border-radius: var(--radius-sm); }

/* ---------- 3. Layout ---------- */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-5); }
.container-prose { max-width: var(--container-prose); margin: 0 auto; padding: 0 var(--space-5); }

.section { padding: var(--space-8) 0; }
.section-tight { padding: var(--space-7) 0; }
.section-alt { background: var(--color-bg-alt); }

/* ---------- 4. Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: saturate(180%) blur(8px);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.01em;
}
.nav-brand:hover { color: var(--color-text); text-decoration: none; }
.nav-brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 900;
  font-size: 1rem;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}
.nav-links a:hover { color: var(--color-primary); text-decoration: none; }

@media (max-width: 720px) {
  .nav-links { gap: var(--space-3); font-size: 0.85rem; }
  .nav-links li:nth-child(n+4) { display: none; }
}

/* ---------- 5. Hero ---------- */
.hero {
  padding: var(--space-9) 0 var(--space-8);
  background:
    radial-gradient(ellipse at top left, rgba(13, 148, 136, 0.08), transparent 60%),
    radial-gradient(ellipse at bottom right, rgba(232, 145, 12, 0.06), transparent 60%);
}
.hero-eyebrow {
  display: inline-block;
  background: rgba(13, 148, 136, 0.1);
  color: var(--color-primary-dark);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
}
@media (prefers-color-scheme: dark) {
  .hero-eyebrow { background: rgba(20, 184, 166, 0.18); color: var(--color-primary-light); }
}
.hero-title {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-4);
  line-height: 1.15;
}
.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: var(--space-6);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--color-primary); color: #FFFFFF; box-shadow: var(--shadow-md); }
.btn-primary:hover { background: var(--color-primary-dark); color: #FFFFFF; box-shadow: var(--shadow-lg); }
.btn-secondary { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-secondary:hover { background: rgba(13, 148, 136, 0.08); color: var(--color-primary-dark); }
.btn-ghost { background: var(--color-bg-alt); color: var(--color-text); }
.btn-ghost:hover { background: var(--color-border); color: var(--color-text); }
.btn-disabled { opacity: 0.55; pointer-events: none; }

/* ---------- 7. Feature Grid ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-5);
}
.feature-card {
  background: var(--color-bg-elev);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(13, 148, 136, 0.1);
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  font-size: 1.25rem;
  font-weight: 800;
}
.feature-card h3 { font-size: 1.125rem; margin-bottom: var(--space-2); }
.feature-card p { color: var(--color-text-muted); margin-bottom: 0; font-size: 0.95rem; }

/* ---------- 8. Comparison Table ---------- */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-5) 0;
  background: var(--color-bg-elev);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.compare-table th, .compare-table td {
  padding: var(--space-4);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}
.compare-table th { background: var(--color-bg-alt); font-weight: 600; }
.compare-table td:first-child, .compare-table th:first-child { text-align: left; font-weight: 500; }
.compare-table tr:last-child td { border-bottom: 0; }
.compare-yes { color: var(--color-primary); font-weight: 700; }
.compare-no { color: var(--color-text-subtle); }
.compare-table th.col-highlight { background: rgba(13, 148, 136, 0.12); color: var(--color-primary-dark); }

/* ---------- 9. Prose (for legal pages) ---------- */
.prose { font-size: 1rem; line-height: 1.75; color: var(--color-text); }
.prose h1 { font-size: 2rem; margin-bottom: var(--space-3); }
.prose h2 { font-size: 1.375rem; margin-top: var(--space-7); margin-bottom: var(--space-3); padding-top: var(--space-4); border-top: 1px solid var(--color-border); }
.prose h2:first-of-type { border-top: 0; padding-top: 0; margin-top: var(--space-5); }
.prose h3 { font-size: 1.05rem; margin-top: var(--space-5); margin-bottom: var(--space-2); }
.prose p, .prose li { color: var(--color-text); }
.prose .lead { color: var(--color-text-muted); font-size: 1.05rem; margin-bottom: var(--space-5); }
.prose .meta {
  display: inline-block;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: 0.95rem;
}
.prose table th, .prose table td {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}
.prose table th { background: var(--color-bg-alt); font-weight: 600; }
.prose .lang-switch { font-size: 0.9rem; margin-bottom: var(--space-5); }
.prose .lang-switch a { margin-right: var(--space-3); }

/* ---------- 10. Forms ---------- */
.form-group { margin-bottom: var(--space-4); }
.form-group label { display: block; font-weight: 600; margin-bottom: var(--space-2); font-size: 0.95rem; }
.form-control {
  width: 100%;
  padding: 10px 14px;
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg-elev);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-control:focus {
  outline: 0;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.16);
}
textarea.form-control { min-height: 140px; resize: vertical; }

/* ---------- 11. Info / Notice Box ---------- */
.info-box {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  margin: var(--space-5) 0;
}
.info-box-amber { border-left-color: var(--color-accent); }
.info-box h3 { margin-top: 0; }
.info-box p:last-child { margin-bottom: 0; }

/* ---------- 12. Definition List (Business Info) ---------- */
.dl-grid {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-3) var(--space-4);
  margin: var(--space-5) 0;
}
.dl-grid dt { font-weight: 600; color: var(--color-text-muted); }
.dl-grid dd { margin: 0; color: var(--color-text); }
@media (max-width: 560px) {
  .dl-grid { grid-template-columns: 1fr; gap: var(--space-1) 0; }
  .dl-grid dt { margin-top: var(--space-3); }
}

/* ---------- 13. FAQ ---------- */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-3);
  background: var(--color-bg-elev);
}
.faq-item summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  color: var(--color-primary);
  font-weight: 800;
  font-size: 1.25rem;
  transition: transform 0.2s ease;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item[open] { border-color: var(--color-primary); }
.faq-item .faq-body {
  color: var(--color-text-muted);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}
.faq-item .faq-body p:last-child { margin-bottom: 0; }

/* ---------- 14. Footer ---------- */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0 var(--space-6);
  margin-top: var(--space-9);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-7);
}
.footer-col h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: var(--space-2); }
.footer-col a { color: var(--color-text-muted); }
.footer-col a:hover { color: var(--color-primary); }
.footer-business {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--color-text-subtle);
}
.footer-business strong { color: var(--color-text-muted); font-weight: 600; }
.footer-bottom {
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: 0.82rem;
  color: var(--color-text-subtle);
}

@media (max-width: 820px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-5); }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- 15. Utilities ---------- */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-subtle { color: var(--color-text-subtle); font-size: 0.9rem; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); border: 0;
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  z-index: 100;
}
.skip-link:focus { left: var(--space-3); top: var(--space-3); }

/* ---------- 16. 404 ---------- */
.error-page {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-8) var(--space-5);
}
.error-page .error-code {
  font-size: 5rem;
  font-weight: 900;
  color: var(--color-primary);
  letter-spacing: -0.04em;
  margin: 0;
  line-height: 1;
}

/* ---------- 17. Language Switcher ---------- */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 4px;
}
.lang-switcher a {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
  line-height: 1.4;
  transition: background 0.15s ease, color 0.15s ease;
}
.lang-switcher a:hover {
  background: rgba(13, 148, 136, 0.1);
  color: var(--color-primary);
  text-decoration: none;
}
.lang-switcher a[aria-current="true"] {
  background: var(--color-primary);
  color: #FFFFFF;
}
.lang-switcher a[aria-current="true"]:hover {
  background: var(--color-primary-dark);
  color: #FFFFFF;
}
@media (max-width: 720px) {
  .lang-switcher a { padding: 3px 8px; font-size: 0.75rem; }
}

/* ---------- 18. Print ---------- */
@media print {
  .site-header, .site-footer, .nav, .hero-actions { display: none !important; }
  body { color: #000; background: #fff; }
  a { color: #000; text-decoration: underline; }
}