/* ==========================================================================
   OTP Indonesia — Design tokens & global rules
   Concept: "Activation Stub" — a virtual OTP number behaves like a
   perforated, single-use ticket: issued fresh, used once, torn off.
   Every card in this system borrows that physical vocabulary.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;1,400&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  /* Color — indigo night-signal field, warm ticket-stock paper, marigold stub accent */
  --indigo-950: #14162B;
  --indigo-900: #1B1E3C;
  --indigo-800: #262A52;
  --indigo-700: #363B70;
  --indigo-line: #3C4070;

  --paper: #FBF3DE;
  --paper-dim: #F1E7C9;
  --paper-line: #E3D6AC;

  --marigold: #F2A93B;
  --marigold-dark: #D68A1F;
  --marigold-ink: #4A2E05;

  --signal: #3FB68B;
  --signal-dark: #2C8C69;

  --ink: #1E1B14;
  --ink-soft: #55503F;
  --cloud: #FBF3DE;
  --mist: rgba(251, 243, 222, 0.72);
  --mist-dim: rgba(251, 243, 222, 0.5);

  --max-width: 1160px;
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 26px;

  --shadow-card: 0 18px 40px -20px rgba(9, 10, 24, 0.55);
  --shadow-pop: 0 24px 60px -18px rgba(9, 10, 24, 0.65);

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'IBM Plex Sans', 'Segoe UI', Tahoma, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--indigo-950);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--paper);
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.1rem, 4.4vw, 3.4rem); letter-spacing: -0.025em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.35rem); letter-spacing: -0.015em; }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1em; }
a { color: inherit; }

.on-paper { color: var(--ink); }
.on-paper h2, .on-paper h3 { color: var(--ink); }
.on-paper p, .on-paper li { color: var(--ink-soft); }

img { max-width: 100%; display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

section { padding: clamp(3rem, 6vw, 5.5rem) 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--marigold);
  margin-bottom: 0.9em;
}
.eyebrow::before {
  content: '';
  width: 18px;
  height: 2px;
  background: var(--marigold);
  display: inline-block;
}
.on-paper .eyebrow { color: var(--marigold-dark); }

.section-head { max-width: 640px; margin-bottom: 2.25rem; }
.section-head p { color: var(--mist); font-size: 1.05rem; }
.on-paper .section-head p { color: var(--ink-soft); }

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--indigo-950);
  border-bottom: 1px solid var(--indigo-line);
}
.site-header .container {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--paper);
}
.site-logo__mark { flex-shrink: 0; }
.site-logo__word span { color: var(--marigold); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.9rem;
}
.site-nav a {
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--mist);
  transition: color 0.15s ease;
}
.site-nav a:hover, .site-nav a.active { color: var(--marigold); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--paper);
  cursor: pointer;
  padding: 0.4rem;
}
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 767px) {
  .site-nav {
    position: fixed;
    inset: 72px 0 0 0;
    background: var(--indigo-950);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem 1.25rem;
    gap: 1.1rem;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  }
  .site-nav.is-open { opacity: 1; transform: translateY(0); visibility: visible; }
  .site-nav a { font-size: 1.05rem; }
  .site-nav .btn { margin-top: 0.5rem; align-self: stretch; text-align: center; }
  .nav-toggle { display: inline-flex; }
}

/* ---- Buttons ---- */
.btn {
  --stub-notch: var(--indigo-950);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 0.85em 1.6em;
  border-radius: 999px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
}
.btn-primary {
  background: var(--marigold);
  color: var(--marigold-ink);
  box-shadow: 0 12px 30px -12px rgba(242, 169, 59, 0.55);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 36px -12px rgba(242, 169, 59, 0.65); }
.btn-ghost {
  background: transparent;
  color: var(--paper);
  border: 1.5px solid var(--indigo-line);
}
.btn-ghost:hover { border-color: var(--marigold); color: var(--marigold); }
.on-paper .btn-ghost { color: var(--ink); border-color: var(--paper-line); }
.on-paper .btn-ghost:hover { border-color: var(--marigold-dark); color: var(--marigold-dark); }

.btn-row { display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }

/* ==========================================================================
   THE STUB — signature component.
   A ticket card: paper surface, rounded body, two circular notches cut into
   the left/right edge (color-matched to whatever sits behind it via
   --stub-notch), plus an optional perforated tear-line.
   ========================================================================== */
.stub {
  --stub-notch: var(--indigo-950);
  position: relative;
  background: var(--paper);
  border-radius: var(--radius);
  padding: 1.6rem 1.7rem;
  box-shadow: var(--shadow-card);
  isolation: isolate;
}
.stub::before,
.stub::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 22px;
  height: 22px;
  background: var(--stub-notch);
  border-radius: 50%;
  transform: translateY(-50%);
  z-index: 2;
}
.stub::before { left: -11px; }
.stub::after { right: -11px; }

.stub--tear {
  border-top: 2px dashed var(--paper-line);
}

.stub--dark {
  --stub-notch: var(--indigo-950);
  background: var(--indigo-800);
  box-shadow: none;
  border: 1px solid var(--indigo-line);
}
.stub--dark::before, .stub--dark::after { background: var(--indigo-950); }

.stub-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--marigold-dark);
}
.stub--dark .stub-label { color: var(--marigold); }

.stub-figure {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.1;
}
.stub--dark .stub-figure { color: var(--paper); }

.stub-caption {
  font-size: 0.92rem;
  color: var(--ink-soft);
  margin-top: 0.35rem;
}
.stub--dark .stub-caption { color: var(--mist); }

/* ---- Footer ---- */
.site-footer {
  background: var(--indigo-900);
  border-top: 1px solid var(--indigo-line);
  padding: 3.2rem 0 2rem;
  font-size: 0.92rem;
  color: var(--mist-dim);
}
.footer-grid {
  display: grid;
  gap: 2.2rem;
  grid-template-columns: 1.2fr 0.9fr 0.9fr 0.9fr;
  margin-bottom: 2.4rem;
}
.footer-grid--home { grid-template-columns: 1.4fr 1fr; max-width: 640px; }
.footer-grid h4 {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper);
  margin-bottom: 0.9rem;
}
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.55rem; }
.footer-grid a { text-decoration: none; color: var(--mist-dim); }
.footer-grid a:hover { color: var(--marigold); }
.footer-bottom {
  border-top: 1px solid var(--indigo-line);
  padding-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.6rem;
  justify-content: space-between;
  font-size: 0.82rem;
}
.footer-disclosure { max-width: 640px; color: var(--mist-dim); }

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---- Misc utility ---- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

:focus-visible { outline: 3px solid var(--signal); outline-offset: 2px; }