/* ============================================================
   _shared/base.css — Shared structural stylesheet
   Loaded before each project's style.css. Defines the common
   reset, theme variable skeleton, and structural components
   (navbar / hero / abstract / contributions / buttons / tags).
   Each project overrides --accent* / --bg / --text* in its own
   :root to retheme without touching structure.
   ============================================================ */

/* ---------- Theme Variable Skeleton ---------- */
/* Defaults match the original Cutscene Agent theme. Each project's
   style.css redefines the color tokens in its own :root block. */
:root {
  --bg: #0a0a0a;
  --bg-rgb: 10, 10, 10;
  --bg-card: rgba(255, 255, 255, 0.025);
  --bg-card-h: rgba(255, 255, 255, 0.05);
  --surface: #0f0f0f;
  --surface-2: #161616;
  --text: #f5f5f5;
  --text-dim: #a3a3a3;
  --text-muted: #737373;
  --accent: #f97316;
  --accent-rgb: 249, 115, 22;
  --accent2: #ea580c;
  --accent2-rgb: 234, 88, 12;
  --accent3: #fbbf24;
  --accent3-rgb: 251, 191, 36;
  --gradient: linear-gradient(135deg, var(--accent), var(--accent2));
  --gradient-subtle: linear-gradient(
    135deg,
    rgba(var(--accent-rgb), 0.15),
    rgba(var(--accent2-rgb), 0.08)
  );
  --font-display: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --max-w: 1200px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.3s var(--ease);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
button {
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  color: inherit;
}

/* ---------- Container ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

/* ---------- Utility ---------- */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-dim) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-sub {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 860px;
  margin: 0 auto;
}
.interactive-figure {
  width: 100%;
  position: relative;
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 20px;
  transition:
    background var(--transition),
    box-shadow var(--transition);
}
.navbar.scrolled {
  background: rgba(var(--bg-rgb), 0.85);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}
.navbar__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.navbar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.navbar__logo-icon {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  color: #fff;
  font-size: 0.85rem;
  box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.35);
}
.navbar__logo-text {
  background: linear-gradient(135deg, #ffffff 0%, var(--text-dim) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.navbar__links {
  display: flex;
  gap: 32px;
}
.navbar__links a {
  font-size: 0.88rem;
  color: var(--text-dim);
  transition: color var(--transition);
  position: relative;
}
.navbar__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  border-radius: 1px;
  transition: width var(--transition);
}
.navbar__links a:hover {
  color: var(--text);
}
.navbar__links a:hover::after {
  width: 100%;
}
@media (max-width: 900px) {
  .navbar__links {
    display: none;
  }
}

/* Language Switch */
.lang-switch {
  display: flex;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 100px;
  padding: 3px;
}
.lang-btn {
  padding: 5px 14px;
  font-size: 0.78rem;
  border-radius: 100px;
  transition: all var(--transition);
  font-weight: 500;
  color: var(--text-dim);
}
.lang-btn.active {
  background: var(--gradient);
  color: #fff;
}
.lang-btn:hover:not(.active) {
  color: var(--text);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 0 80px;
  padding-left: max(20px, calc((100vw - 1400px) / 2));
  padding-right: max(20px, calc((100vw - 1400px) / 2));
  overflow: hidden;
}
.hero__particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.hero__particles::before,
.hero__particles::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  opacity: 0.12;
  filter: blur(80px);
  animation: float 12s ease-in-out infinite;
}
.hero__particles::before {
  width: 500px;
  height: 500px;
  background: var(--accent);
  top: -10%;
  left: -5%;
}
.hero__particles::after {
  width: 400px;
  height: 400px;
  background: var(--accent2);
  bottom: -10%;
  right: -5%;
  animation-delay: -6s;
  animation-direction: reverse;
}
@keyframes float {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(40px, -30px) scale(1.05);
  }
  66% {
    transform: translate(-20px, 20px) scale(0.95);
  }
}

.hero__content {
  position: relative;
  z-index: 2;
  flex: 1;
  padding: 0 clamp(20px, 5vw, 60px);
  max-width: 600px;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 24px;
  font-weight: 500;
}
.hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.4);
  }
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1;
  margin-bottom: 20px;
}
.hero__title-line {
  display: block;
}
.hero__title-line--1 {
  font-size: clamp(3rem, 7vw, 5.5rem);
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__title-line--2 {
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  color: var(--text);
  -webkit-text-fill-color: var(--text);
}
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-dim);
  margin-bottom: 16px;
  font-weight: 400;
}
.hero__desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}

/* Hero Buttons */
.hero__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn--primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(var(--accent-rgb), 0.3);
}
.btn--primary:hover {
  box-shadow: 0 6px 30px rgba(var(--accent-rgb), 0.45);
  transform: translateY(-2px);
}
.btn--glass {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  color: var(--text);
}
.btn--glass:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}
.btn--ghost {
  color: var(--text-dim);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.btn--ghost:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Hero Visual */
.hero__visual {
  position: relative;
  z-index: 2;
  flex: 1.2;
  display: flex;
  justify-content: center;
  padding: 0 20px;
  max-width: 720px;
}
.hero__img-wrapper {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow:
    0 20px 80px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.05);
  max-width: 680px;
}
.hero__img-glow {
  position: absolute;
  inset: -40px;
  background: radial-gradient(ellipse at center, rgba(var(--accent-rgb), 0.15) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* Hero Scroll */
.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 3;
}
.hero__scroll span {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-muted);
}
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}
@keyframes scroll-pulse {
  0%,
  100% {
    opacity: 0.3;
    transform: scaleY(0.7);
  }
  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

/* ============================================================
   ABSTRACT
   ============================================================ */
.abstract {
  padding: 100px 0 80px;
}
.abstract__inner {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  max-width: 820px;
  margin: 0 auto;
}
.abstract__line {
  flex-shrink: 0;
  width: 3px;
  min-height: 80px;
  align-self: stretch;
  background: var(--gradient);
  border-radius: 2px;
}
.abstract__text {
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--text-dim);
}
.abstract__text strong {
  color: var(--text);
  font-weight: 600;
}

/* ============================================================
   CONTRIBUTIONS
   ============================================================ */
.contributions {
  padding: 100px 0 120px;
}
.contrib-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
@media (max-width: 960px) {
  .contrib-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }
}

.contrib-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 36px 28px 28px;
  transition: all 0.4s var(--ease);
  overflow: hidden;
}
.contrib-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity var(--transition);
}
.contrib-card:hover {
  background: var(--bg-card-h);
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}
.contrib-card:hover::before {
  opacity: 1;
}

.contrib-card__num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: absolute;
  top: 16px;
  right: 20px;
}
.contrib-card__visual {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}
.contrib-card__title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.contrib-card__desc {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.7;
  margin-bottom: 16px;
}
.contrib-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag {
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 100px;
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ============================================================
   SHARED KEYFRAMES
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}