/* ══════════════════════════════════════════════════════════
   GhostReceipt — Shared Documentation Page Styles
   Ultra-premium dark theme for all HTML doc pages.
   ══════════════════════════════════════════════════════════ */

/* ── Keyframes ── */
@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  25%  { background-position: 100% 50%; }
  50%  { background-position: 50% 100%; }
  75%  { background-position: 0% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes haze {
  0%, 100% { opacity: 0.3; transform: scale(1) translate(0, 0) rotate(0deg); }
  25%      { opacity: 0.5; transform: scale(1.2) translate(10%, -10%) rotate(5deg); }
  50%      { opacity: 0.4; transform: scale(0.9) translate(-10%, 10%) rotate(-5deg); }
  75%      { opacity: 0.5; transform: scale(1.1) translate(5%, -5%) rotate(3deg); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

::selection {
  background: rgba(59, 130, 246, 0.35);
  color: #e0ecff;
}

::-moz-selection {
  background: rgba(59, 130, 246, 0.35);
  color: #e0ecff;
}

/* ── Premium scrollbar ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: rgba(255,255,255,0.03); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.10); border-radius: 9999px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.20); }
* { scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.10) rgba(255,255,255,0.03); }

/* ── Body — animated dark background ── */
body {
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  line-height: 1.7;
  margin: 0;
  padding: 0;
  background: linear-gradient(
    135deg,
    #04060f 0%, #080c1a 20%, #060814 40%,
    #080d1c 60%, #050810 80%, #020307 100%
  );
  background-size: 400% 400%;
  animation: gradientShift 30s ease-in-out infinite;
  color: #e8eeff;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Ambient radial glows */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 15% 20%, rgba(37, 99, 235, 0.12) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 80%, rgba(59, 130, 246, 0.09) 0%, transparent 55%),
    radial-gradient(circle at 50% 50%, rgba(96, 165, 250, 0.05) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background:
    radial-gradient(circle at 30% 40%, rgba(37, 99, 235, 0.1) 0%, transparent 30%),
    radial-gradient(circle at 70% 60%, rgba(99, 102, 241, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 50% 80%, rgba(59, 130, 246, 0.07) 0%, transparent 40%);
  filter: blur(80px);
  animation: haze 40s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

body > * {
  position: relative;
  z-index: 1;
}

/* ── Noise grain overlay ── */
.grain-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.022;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ── Page layout ── */
.doc-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem 6rem;
  animation: fadeInUp 0.5s ease both;
}

@media (max-width: 640px) {
  .doc-page {
    padding: 1.25rem 1rem 6rem;
  }
}

/* ── Back link ── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-bottom: 2rem;
  padding: 0.5rem 1rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(34, 211, 238, 0.25);
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: all 0.25s ease;
}

.back-link:hover {
  border-color: rgba(34, 211, 238, 0.55);
  background: rgba(15, 23, 42, 0.8);
  color: #fff;
  box-shadow: 0 0 16px rgba(34, 211, 238, 0.08);
  transform: translateX(-2px);
}

/* ── Glass card container ── */
.doc-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1rem;
  padding: 2rem;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  margin-bottom: 1.5rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.doc-card:hover {
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow:
    0 0 0 1px rgba(96, 165, 250, 0.04),
    0 8px 32px rgba(0, 0, 0, 0.2);
}

@media (max-width: 640px) {
  .doc-card {
    padding: 1.25rem;
    border-radius: 0.75rem;
  }
}

/* ── Typography ── */
h1 {
  color: #fff;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  text-shadow: 0 0 24px rgba(96, 165, 250, 0.15);
}

h2 {
  color: #fff;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

h2::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 1em;
  background: linear-gradient(180deg, #3b82f6, #22d3ee);
  border-radius: 2px;
  margin-right: 0.625rem;
  vertical-align: middle;
}

p {
  color: rgba(224, 232, 255, 0.75);
  margin-bottom: 0.75rem;
  font-size: 0.9375rem;
}

/* ── Links ── */
a:not(.back-link):not(.footer-link):not(.footer-social) {
  color: #60a5fa;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

a:not(.back-link):not(.footer-link):not(.footer-social):hover {
  color: #93c5fd;
  border-bottom-color: rgba(96, 165, 250, 0.4);
}

/* ── Lists ── */
ul, ol {
  margin: 0.75rem 0;
  padding-left: 1.25rem;
  color: rgba(224, 232, 255, 0.7);
}

li {
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
  line-height: 1.65;
}

li strong {
  color: rgba(255, 255, 255, 0.9);
}

/* ── Code ── */
code {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.15rem 0.4rem;
  border-radius: 0.375rem;
  font-size: 0.85em;
  font-family: 'Geist Mono', 'JetBrains Mono', ui-monospace, monospace;
  color: #93c5fd;
}

pre {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 0.75rem;
  padding: 1.25rem;
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.6;
  margin: 1rem 0;
  color: rgba(224, 232, 255, 0.8);
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

/* ── Callout boxes ── */
.warning {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-left: 3px solid rgba(239, 68, 68, 0.6);
  padding: 1rem 1.25rem;
  border-radius: 0.5rem;
  margin: 1rem 0;
  color: rgba(252, 165, 165, 0.9);
}

.tip {
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-left: 3px solid rgba(59, 130, 246, 0.6);
  padding: 1rem 1.25rem;
  border-radius: 0.5rem;
  margin: 1rem 0;
  color: rgba(147, 197, 253, 0.9);
}

/* ── FAQ items ── */
.faq-item {
  margin-bottom: 0;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h2 {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
}

/* ── Premium divider ── */
.premium-divider {
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.08) 20%,
    rgba(96, 165, 250, 0.12) 50%,
    rgba(255, 255, 255, 0.08) 80%,
    transparent 100%
  );
  border: none;
  margin: 2rem 0;
}

/* ══════════════════════════════════════════════════════════
   FOOTER — frosted glass, matching React app footer
   ══════════════════════════════════════════════════════════ */
.doc-footer {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 100;
  background: linear-gradient(
    to top,
    rgba(4, 6, 15, 0.97),
    rgba(4, 6, 15, 0.7) 60%,
    transparent
  );
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 0.625rem 1.25rem;
}

.doc-footer-inner {
  max-width: 64rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.25rem 1rem;
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.45);
}

@media (min-width: 640px) {
  .doc-footer-inner {
    justify-content: space-between;
    font-size: 0.75rem;
    padding: 0 0.75rem;
  }
}

.footer-links {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .footer-links {
    gap: 1rem;
  }
}

.footer-link {
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.footer-link:hover {
  color: rgba(255, 255, 255, 0.9);
}

.footer-sep {
  color: rgba(255, 255, 255, 0.15);
  user-select: none;
}

.footer-socials {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.footer-social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  color: rgba(255, 255, 255, 0.55);
  transition: color 0.2s ease;
}

.footer-social:hover {
  color: rgba(255, 255, 255, 0.95);
}

.footer-social svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}