:root {
  --bg-0: #010611;
  --bg-1: #041a3a;
  --bg-2: #0a2f61;
  --ink: #e6f0ff;
  --ink-dim: #b9cde4;
  --line: rgba(140, 184, 230, 0.34);
  --card: rgba(4, 19, 42, 0.76);
  --accent: #a7d3ff;
  --font-main: "Tamil MN", "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

body {
  color: var(--ink);
  font-family: var(--font-main);
  background:
    radial-gradient(circle at 8% -16%, rgba(131, 192, 245, 0.28), transparent 35%),
    radial-gradient(circle at 90% 5%, rgba(109, 169, 238, 0.25), transparent 34%),
    radial-gradient(circle at 55% 122%, rgba(111, 198, 255, 0.2), transparent 50%),
    linear-gradient(165deg, var(--bg-0) 0%, var(--bg-1) 48%, var(--bg-2) 100%);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: -16%;
  z-index: -2;
  pointer-events: none;
}

body::before {
  background:
    conic-gradient(from 138deg at 30% 42%, rgba(129, 198, 255, 0.18), transparent 33%, rgba(95, 154, 229, 0.13), transparent 71%),
    radial-gradient(circle at 64% 58%, rgba(112, 188, 248, 0.2), transparent 52%);
  filter: blur(24px);
  animation: currentFlow 40s linear infinite alternate;
}

body::after {
  background: radial-gradient(circle at 50% 60%, rgba(139, 206, 255, 0.16), transparent 62%);
  opacity: 0.5;
  animation: tidalDrift 42s linear infinite;
}

.bg-noise,
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.bg-noise {
  background:
    repeating-radial-gradient(circle at 50% 50%, rgba(210, 233, 255, 0.02) 0 1px, transparent 1px 20px),
    repeating-linear-gradient(140deg, rgba(125, 180, 231, 0.02) 0 1px, transparent 1px 17px);
  opacity: 0.24;
}

.bg-glow {
  background:
    radial-gradient(circle at 48% 14%, rgba(177, 224, 255, 0.24), transparent 44%),
    radial-gradient(circle at 16% 72%, rgba(112, 171, 245, 0.2), transparent 40%),
    radial-gradient(circle at 86% 73%, rgba(117, 198, 255, 0.18), transparent 43%);
  filter: blur(0.6px);
  animation: pulse 12s ease-in-out infinite, glowDrift 28s ease-in-out infinite alternate;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.4;
  }
  50% {
    opacity: 0.68;
  }
}

@keyframes glowDrift {
  from {
    transform: translate3d(-2%, 0, 0) scale(1);
  }
  to {
    transform: translate3d(2%, -1%, 0) scale(1.08);
  }
}

@keyframes currentFlow {
  from {
    transform: translate3d(-4%, 2%, 0) rotate(-2deg);
  }
  to {
    transform: translate3d(4%, -3%, 0) rotate(2deg);
  }
}

@keyframes tidalDrift {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(2.2%, -1.2%, 0) scale(1.03);
  }
}

@keyframes homeOceanFlow {
  from {
    transform: translate3d(-3%, 1.5%, 0) rotate(-1.2deg);
  }
  to {
    transform: translate3d(3%, -1.8%, 0) rotate(1.2deg);
  }
}

.site-header,
.section,
.article-wrap {
  width: min(980px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 1rem 0 0.7rem;
  display: flex;
  justify-content: center;
  align-items: center;
  background: transparent;
  border-bottom: 0;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.03em;
  font-size: 0.95rem;
  font-weight: 600;
}

nav {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  justify-content: center;
  background: rgba(17, 48, 86, 0.3);
  border: 1px solid rgba(176, 216, 248, 0.36);
  border-radius: 999px;
  padding: 0.5rem 1.15rem;
  backdrop-filter: blur(18px) saturate(130%);
  box-shadow:
    inset 0 0 20px rgba(177, 219, 252, 0.16),
    0 10px 30px rgba(4, 20, 45, 0.26);
}

nav a {
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
}

nav a:hover,
nav a.active {
  color: var(--accent);
}

.hero {
  min-height: 72vh;
  display: grid;
  place-content: center;
  text-align: center;
  padding: 3rem 0 4rem;
}

body[data-page="home"]::after,
body[data-page="home"] .bg-noise {
  display: none;
}

body[data-page="home"]::before {
  background:
    radial-gradient(circle at 20% 28%, rgba(127, 185, 238, 0.22), transparent 52%),
    radial-gradient(circle at 78% 34%, rgba(96, 156, 223, 0.2), transparent 50%),
    radial-gradient(circle at 48% 88%, rgba(119, 196, 244, 0.2), transparent 58%);
  filter: blur(18px);
  animation: homeOceanFlow 34s ease-in-out infinite alternate;
}

body[data-page="home"] .bg-glow {
  background:
    radial-gradient(circle at 50% 20%, rgba(149, 212, 255, 0.22), transparent 46%),
    radial-gradient(circle at 14% 72%, rgba(103, 160, 228, 0.18), transparent 44%),
    radial-gradient(circle at 86% 74%, rgba(107, 184, 238, 0.16), transparent 46%);
}

.hero h1 {
  margin: 0;
  font-family: var(--font-main);
  font-size: clamp(2.6rem, 8vw, 5.8rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  text-shadow: 0 0 18px rgba(102, 157, 221, 0.2);
}

.hero p {
  margin-top: 0.2rem;
  color: var(--ink-dim);
  letter-spacing: 0.08em;
  font-size: clamp(0.9rem, 2.1vw, 1.1rem);
}

.section {
  padding: 2rem 0;
}

.panel,
.article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.24);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-main);
}

h2 {
  font-size: clamp(2rem, 4.1vw, 2.8rem);
}

h3 {
  margin-top: 0.7rem;
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
}

p,
li,
a {
  font-size: 0.98rem;
}

.sub {
  margin: 0.3rem 0 0;
  color: var(--ink-dim);
}

.model-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.model-card {
  background: rgba(4, 18, 38, 0.82);
  border: 1px solid rgba(140, 188, 236, 0.24);
  border-radius: 8px;
  padding: 0.9rem;
}

body[data-page="theory"] main h1,
body[data-page="theory"] main h2,
body[data-page="theory"] main h3,
body[data-page="theory"] main p,
body[data-page="theory"] main li,
body[data-page="theory"] main a {
  font-family: var(--font-main);
}

body[data-page="theory"] .model-card p {
  line-height: 1.58;
}

.model-card ul,
.writing-list {
  margin: 0.65rem 0 0;
  padding-left: 1rem;
}

.model-card a,
.writing-list a,
.article a,
.back-link {
  color: #b7def0;
  text-decoration: none;
}

.model-card a:hover,
.writing-list a:hover,
.article a:hover,
.back-link:hover {
  color: var(--accent);
}

.article-wrap {
  padding: 2rem 0 3rem;
}

.article h1 {
  font-size: clamp(1.58rem, 2.7vw, 2.08rem);
  line-height: 1.2;
}

.article,
.article h1,
.article h2,
.article h3,
.article p,
.article li,
.article a,
.equation {
  font-family: var(--font-main);
}

.article p,
.article li,
.article a {
  font-size: 1rem;
  line-height: 1.56;
}

.source-log {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(140, 184, 230, 0.28);
}

.source-log ul {
  margin: 0.5rem 0 0;
  padding-left: 1rem;
}

.source-log li {
  margin-bottom: 0.35rem;
}

.evidence-list {
  margin: 0.6rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.evidence-item {
  background: rgba(4, 18, 38, 0.82);
  border: 1px solid rgba(140, 188, 236, 0.24);
  border-radius: 8px;
  padding: 0.8rem 0.9rem;
}

.evidence-item p {
  margin: 0.25rem 0;
}

.screenshot-grid {
  margin-top: 0.7rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.shot-card {
  margin: 0;
  border: 1px solid rgba(140, 188, 236, 0.24);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(3, 13, 30, 0.72);
}

.shot-card img {
  width: 100%;
  height: auto;
  display: block;
}

.shot-card figcaption {
  padding: 0.45rem 0.6rem 0.55rem;
  font-size: 0.9rem;
  color: var(--ink-dim);
}

.article .dek {
  margin-top: 0.45rem;
  color: var(--ink-dim);
}

.article blockquote {
  margin: 1rem 0;
  padding-left: 1rem;
  border-left: 2px solid rgba(156, 225, 255, 0.55);
  color: #d4e9f5;
}

.article .part-title {
  margin-top: 1.5rem;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.article .verbatim-source-text {
  margin: 0.9rem 0 0;
  white-space: pre-wrap;
  font-family: var(--font-main);
  font-size: 1.02rem;
  line-height: 1.86;
  color: var(--ink);
  background: transparent;
  border: 0;
  padding: 0;
}

.article .verbatim-rendered {
  margin: 0.9rem 0 0;
}

.article .verbatim-rendered .verbatim-line {
  margin: 0;
  font-family: var(--font-main);
  font-size: 1.02rem;
  line-height: 1.86;
  color: var(--ink);
}

.article .verbatim-rendered .verbatim-heading {
  margin: 0.45rem 0 0.25rem;
  color: var(--accent);
  letter-spacing: 0.03em;
  font-size: clamp(1.08rem, 2vw, 1.34rem);
  line-height: 1.38;
}

.article .verbatim-rendered .verbatim-list {
  margin: 0.15rem 0 0.15rem 1.2rem;
  padding: 0;
  display: grid;
  gap: 0.16rem;
}

.article .verbatim-rendered .verbatim-list li {
  margin: 0;
  font-family: var(--font-main);
  font-size: 1.02rem;
  line-height: 1.76;
  color: var(--ink);
}

.article .verbatim-rendered .verbatim-gap {
  height: 0.72rem;
}

.article .verbatim-rendered .verbatim-divider {
  border: 0;
  border-top: 1px solid rgba(140, 184, 230, 0.28);
  margin: 0.62rem 0;
}

.equation {
  margin: 0.9rem 0;
  text-align: center;
  font-size: 1.06rem;
  color: #def2ff;
  letter-spacing: 0.01em;
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 860px) {
  .site-header {
    position: static;
    justify-content: center;
  }

  nav {
    width: 100%;
    border-radius: 14px;
    justify-content: center;
  }

  .hero {
    min-height: 56vh;
  }

  .model-grid {
    grid-template-columns: 1fr;
  }

  .screenshot-grid {
    grid-template-columns: 1fr;
  }
}