/* =============================================
   GEO-Flash-TH Landing Page — Styles
   Per BRAND-VI-GUIDE.md v1.0 (approved)
   ============================================= */

/* --- Design Tokens (from BRAND-VI-GUIDE.md §6.5) --- */
:root {
  /* Primary */
  --color-primary:       #0B4F6C;
  --color-primary-light: #1A7F9E;
  --color-primary-dark:  #072D3F;

  /* Accent */
  --color-accent:        #F49E1A;
  --color-success:       #2E8B57;
  --color-danger:        #D64545;

  /* Neutral */
  --color-ink:           #0F172A;
  --color-slate:         #334155;
  --color-steel:         #64748B;
  --color-cloud:         #E2E8F0;
  --color-mist:          #F1F5F9;
  --color-frost:         #F8FAFC;
  --color-white:         #FFFFFF;

  /* Typography */
  --font-sans:  'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-thai:  'IBM Plex Sans Thai', 'Noto Sans Thai', 'Sarabun', sans-serif;
  --font-mono:  'IBM Plex Mono', 'Fira Code', 'JetBrains Mono', monospace;

  /* Type Scale */
  --text-display-xl: 3.5rem;
  --text-display-l:  2.5rem;
  --text-display-m:  2rem;
  --text-heading-l:  1.5rem;
  --text-heading-m:  1.25rem;
  --text-body-l:     1.125rem;
  --text-body:       1rem;
  --text-body-s:     0.875rem;
  --text-caption:    0.75rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.5rem;
  --space-6:  2rem;
  --space-8:  3rem;
  --space-10: 4rem;
  --space-12: 6rem;

  /* Radius */
  --radius-sm:   0.25rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

  /* Motion */
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;
  --easing-default: cubic-bezier(0.4, 0, 0.2, 1);
  --easing-enter:   cubic-bezier(0, 0, 0.2, 1);
  --easing-exit:    cubic-bezier(0.4, 0, 1, 1);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --duration-fast: 0ms;
    --duration-base: 0ms;
    --duration-slow: 0ms;
  }
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-thai);
  background: var(--color-frost);
  color: var(--color-ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--duration-fast) var(--easing-default); }
a:hover { color: var(--color-primary-light); }
img { max-width: 100%; display: block; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 600; border-radius: var(--radius-sm); cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
  border: 2px solid transparent; white-space: nowrap; font-family: inherit;
}
.btn--sm  { padding: var(--space-2) var(--space-4); font-size: var(--text-body-s); }
.btn--lg  { padding: var(--space-3) var(--space-6); font-size: var(--text-body); }
.btn--primary {
  background: var(--color-accent); color: var(--color-ink);
  border-color: var(--color-accent);
}
.btn--primary:hover { background: #e6920f; border-color: #e6920f; }
.btn--ghost  { background: transparent; border-color: var(--color-cloud); color: var(--color-slate); }
.btn--ghost:hover  { border-color: var(--color-steel); color: var(--color-ink); }
.btn--full  { width: 100%; }

/* --- Navigation --- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(248, 250, 252, 0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-cloud);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav__logo {
  display: flex; align-items: center; gap: var(--space-2);
  font-weight: 700; font-size: var(--text-body); color: var(--color-ink);
}
.nav__logo-icon {
  color: var(--color-primary); display: flex; align-items: center;
}
.nav__links { display: flex; align-items: center; gap: var(--space-2); list-style: none; }
.nav__links a { color: var(--color-slate); padding: 6px 12px; border-radius: var(--radius-sm); font-size: var(--text-body-s); }
.nav__links a:hover { color: var(--color-ink); }
.nav__links .btn--primary { color: var(--color-ink); }

/* --- Hero --- */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: 120px 0 var(--space-10); overflow: hidden;
  background: var(--color-frost);
}
.hero__bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% -5%, rgba(11, 79, 108, 0.06), transparent),
    radial-gradient(ellipse 40% 40% at 85% 75%, rgba(244, 158, 26, 0.04), transparent);
}
.hero__bg::after {
  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'%3E%3Cg fill='%230B4F6C' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='1.5'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero__content { position: relative; z-index: 1; text-align: center; }
.hero__badge { margin-bottom: var(--space-5); }
.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-4); border-radius: var(--radius-full);
  background: rgba(11, 79, 108, 0.08); color: var(--color-primary);
  font-size: var(--text-body-s); font-weight: 600;
  border: 1px solid rgba(11, 79, 108, 0.15);
}
.hero__title {
  font-size: clamp(2.5rem, 6vw, var(--text-display-xl));
  font-weight: 700; line-height: 1.1; letter-spacing: -0.02em;
  color: var(--color-ink); margin-bottom: var(--space-5);
}
.hero__title-highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__subtitle {
  max-width: 680px; margin: 0 auto var(--space-8);
  font-size: var(--text-body-l); color: var(--color-slate); line-height: 1.7;
}
.hero__actions { display: flex; gap: var(--space-4); justify-content: center; flex-wrap: wrap; margin-bottom: var(--space-10); }
.hero__stats {
  display: flex; gap: var(--space-8); justify-content: center; flex-wrap: wrap;
}
.stat { text-align: center; }
.stat__value {
  display: block;
  font-size: var(--text-display-m); font-weight: 300; color: var(--color-primary);
  letter-spacing: -0.01em;
}
.stat__label { font-size: var(--text-caption); color: var(--color-steel); text-transform: uppercase; letter-spacing: 0.05em; }

/* --- Sections --- */
section { padding: var(--space-12) 0; }

.section-header { text-align: center; margin-bottom: var(--space-10); }
.section-title {
  font-size: var(--text-display-m); font-weight: 600; color: var(--color-ink);
  margin-bottom: var(--space-4); letter-spacing: -0.01em;
}
.section-desc {
  max-width: 600px; margin: 0 auto;
  color: var(--color-slate); font-size: var(--text-body-l);
}

/* --- Cards --- */
.cards-3 {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5); margin-bottom: var(--space-10);
}
.card {
  background: var(--color-white); border: 1px solid var(--color-cloud);
  border-radius: var(--radius-md); padding: var(--space-6);
  box-shadow: var(--shadow-sm); transition: box-shadow var(--duration-fast) var(--easing-default);
}
.card:hover { box-shadow: var(--shadow-md); }
.card__icon {
  width: 56px; height: 56px; display: flex; align-items: center; justify-content: center;
  background: rgba(11, 79, 108, 0.08); color: var(--color-primary);
  border-radius: var(--radius-sm); margin-bottom: var(--space-5);
}
.card__title { font-size: var(--text-heading-m); font-weight: 600; margin-bottom: var(--space-2); color: var(--color-ink); }
.card__desc { color: var(--color-slate); font-size: var(--text-body); line-height: 1.65; }

/* --- Use Cases --- */
.usecases {
  background: var(--color-white); border: 1px solid var(--color-cloud);
  border-radius: var(--radius-md); padding: var(--space-8);
  box-shadow: var(--shadow-sm);
}
.usecases__title { font-size: var(--text-heading-l); font-weight: 600; margin-bottom: var(--space-6); text-align: center; }
.usecases__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}
.usecase {
  display: flex; flex-direction: column; gap: var(--space-2);
  padding: var(--space-5); border-radius: var(--radius-sm);
  background: var(--color-frost); border: 1px solid var(--color-cloud);
}
.usecase__tag {
  display: inline-block; align-self: flex-start;
  font-size: var(--text-caption); font-weight: 600; text-transform: uppercase;
  padding: 2px 10px; border-radius: var(--radius-sm);
  background: rgba(11, 79, 108, 0.08); color: var(--color-primary);
  letter-spacing: 0.04em;
}
.usecase p { color: var(--color-slate); font-size: var(--text-body-s); }

/* --- Trust --- */
.trust { background: var(--color-white); }

.trust__logos {
  display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-6);
  margin-bottom: var(--space-10);
}
.trust__logo-placeholder {
  width: 140px; height: 60px; display: flex; align-items: center; justify-content: center;
  background: var(--color-frost); border: 1px dashed var(--color-cloud);
  border-radius: var(--radius-sm); color: var(--color-steel);
  font-size: var(--text-caption); font-weight: 500;
}

.trust__signals {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-4); margin-bottom: var(--space-10);
}
.signal {
  display: flex; gap: var(--space-3); padding: var(--space-5);
  background: var(--color-frost); border-radius: var(--radius-sm);
  border: 1px solid var(--color-cloud);
}
.signal__check { color: var(--color-success); font-size: 1.15rem; flex-shrink: 0; margin-top: 2px; }
.signal strong { display: block; margin-bottom: 2px; font-size: var(--text-body-s); color: var(--color-ink); }
.signal p { color: var(--color-steel); font-size: var(--text-caption); }

.testimonial {
  max-width: 720px; margin: 0 auto; text-align: center;
  padding: var(--space-8); border-radius: var(--radius-md);
  background: var(--color-frost); border: 1px solid var(--color-cloud);
}
.testimonial blockquote {
  font-size: var(--text-body-l); font-style: italic; color: var(--color-ink);
  margin-bottom: var(--space-5); line-height: 1.7;
}
.testimonial cite { font-style: normal; }
.testimonial cite strong { display: block; margin-bottom: 2px; }
.testimonial cite span { color: var(--color-steel); font-size: var(--text-body-s); }

/* --- CTA --- */
.cta { background: var(--color-frost); }
.cta__grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-10); align-items: start;
}
.cta__title { font-size: var(--text-display-m); font-weight: 600; margin-bottom: var(--space-4); letter-spacing: -0.01em; }
.cta__desc { color: var(--color-slate); font-size: var(--text-body-l); margin-bottom: var(--space-5); }
.cta__benefits {
  list-style: none; display: flex; flex-direction: column; gap: var(--space-3);
}
.cta__benefits li {
  padding-left: 28px; position: relative; color: var(--color-slate);
  font-size: var(--text-body);
}
.cta__benefits li::before {
  content: '\2713'; position: absolute; left: 0; color: var(--color-success); font-weight: 700;
}

.cta__form {
  background: var(--color-white); border: 1px solid var(--color-cloud);
  border-radius: var(--radius-md); padding: var(--space-8);
  box-shadow: var(--shadow-md);
}
.cta__form-title { font-size: var(--text-heading-l); font-weight: 600; margin-bottom: var(--space-5); }
.form-group { margin-bottom: var(--space-4); }
.form-group label {
  display: block; font-size: var(--text-body-s); font-weight: 500;
  margin-bottom: var(--space-1); color: var(--color-ink);
}
.required { color: var(--color-danger); }
.form-group input,
.form-group select {
  width: 100%; padding: var(--space-3) var(--space-4);
  background: var(--color-white); border: 1px solid var(--color-cloud);
  border-radius: var(--radius-sm); color: var(--color-ink);
  font-size: var(--text-body); font-family: inherit;
  transition: border-color var(--duration-fast) var(--easing-default);
}
.form-group input:focus,
.form-group select:focus {
  outline: none; border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(11, 79, 108, 0.12);
}
.form-group input::placeholder { color: var(--color-steel); }
.cta__form-note { font-size: var(--text-caption); color: var(--color-steel); margin-top: var(--space-3); text-align: center; }

/* --- Footer --- */
.footer {
  background: var(--color-primary-dark); color: var(--color-white);
  padding: var(--space-8) 0;
}
.footer__inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-4); }
.footer__brand { display: flex; align-items: center; gap: var(--space-2); font-weight: 600; }
.footer__brand p { font-weight: 400; opacity: 0.7; font-size: var(--text-body-s); }
.footer__links { display: flex; gap: var(--space-5); }
.footer__links a { color: rgba(255, 255, 255, 0.7); font-size: var(--text-body-s); }
.footer__links a:hover { color: var(--color-white); }

/* --- Toast --- */
.toast {
  position: fixed; bottom: var(--space-6); right: var(--space-6);
  background: var(--color-success); color: var(--color-white);
  padding: var(--space-4) var(--space-5); border-radius: var(--radius-sm);
  font-weight: 600; font-size: var(--text-body); z-index: 200;
  box-shadow: var(--shadow-xl);
  animation: toastIn var(--duration-fast) var(--easing-enter),
             toastOut var(--duration-fast) var(--easing-exit) 3.7s forwards;
}
@keyframes toastIn  { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes toastOut { from { opacity: 1; transform: translateY(0); } to { opacity: 0; transform: translateY(12px); } }

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --text-display-xl: 2.5rem;
    --text-display-m: 1.75rem;
  }
  .nav__links li:not(:last-child) { display: none; }
  .hero { padding: var(--space-10) 0 var(--space-8); }
  .hero__stats { gap: var(--space-5); }
  .usecases { padding: var(--space-6) var(--space-5); }
  .cta__grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .trust__logos { gap: var(--space-4); }
  .trust__logo-placeholder { width: 110px; height: 48px; }
  .footer__inner { flex-direction: column; text-align: center; }
}