/* ============================================================
   Kuairp Tech Report — intro page stylesheet
   Faithfully replicates the GameMind homepage design language:
   Framer-style orange accent (#FF6400), Inter typeface, dark/light
   themes, grain overlay, ambient glows, grid lines, pill buttons,
   uppercase tracking labels, framer-like scroll reveals.
   Self-contained (does not depend on _shared/base.css); pairs with
   _shared/ui.js for i18n / navbar / data-aos / counters.
   ============================================================ */

/* ---------- Design Tokens (dark default, matches homepage) ---------- */
:root {
  --bg: #050505;
  --bg-hero: #0a0a0a;
  --bg-hero-rgb: 10, 10, 10;
  --bg-card: #0d0d0d;
  --bg-elev: #111111;
  --text: #ffffff;
  --text-dim: rgba(255, 255, 255, 0.62);
  --text-muted: rgba(255, 255, 255, 0.42);
  --text-faint: rgba(255, 255, 255, 0.25);
  --border: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.12);
  --grid-line: rgba(255, 255, 255, 0.045);

  --orange: #ff6400;
  --orange-soft: #ffb347;
  --orange-rgb: 255, 100, 0;
  --gradient: linear-gradient(135deg, #ff6400 0%, #ffb347 60%, rgba(255, 100, 0, 0.55) 100%);
  --green: #22c55e;

  --glow-a: rgba(255, 100, 0, 0.12);
  --glow-b: rgba(255, 100, 0, 0.07);

  /* Chart palette */
  --chart-base: rgba(255, 255, 255, 0.22);
  --chart-m2her: #7aa5ff;

  --font: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  --max-w: 1200px;
  --radius: 18px;
  --radius-sm: 12px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --nav-h: 72px;
}

[data-theme='light'] {
  --bg: #f8f8f8;
  --bg-hero: #ffffff;
  --bg-hero-rgb: 255, 255, 255;
  --bg-card: #ffffff;
  --bg-elev: #f4f4f4;
  --text: #0a0a0a;
  --text-dim: rgba(10, 10, 10, 0.62);
  --text-muted: rgba(10, 10, 10, 0.45);
  --text-faint: rgba(10, 10, 10, 0.28);
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --grid-line: rgba(0, 0, 0, 0.04);
  --glow-a: rgba(255, 100, 0, 0.08);
  --glow-b: rgba(255, 100, 0, 0.05);

  /* Chart palette */
  --chart-base: rgba(0, 0, 0, 0.18);
  --chart-m2her: #3b6fd4;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  letter-spacing: -0.01em;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
::selection { background: var(--orange); color: #fff; }

/* ---------- Grain overlay (homepage signature) ---------- */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' 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");
}
[data-theme='light'] .grain { opacity: 0.018; }

/* ---------- Layout helpers ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
}

.section {
  position: relative;
  padding: clamp(72px, 10vw, 120px) 0;
  overflow: hidden;
}

/* Ambient orange glow + grid (homepage Hero/Capabilities signature) */
.glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.glow--top {
  background: radial-gradient(ellipse 60% 50% at 50% 0%, var(--glow-b) 0%, transparent 70%);
}
.glow--mouse {
  background: radial-gradient(ellipse 55% 50% at var(--mx, 50%) var(--my, 50%), var(--glow-a) 0%, transparent 65%);
  transition: background 0.4s ease;
}
.grid-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: 0.6;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 100%);
}

.section > .container { position: relative; z-index: 2; }

/* ---------- Section header (uppercase label + massive title) ---------- */
.eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 18px;
}
.section-title {
  font-size: clamp(2.1rem, 5.2vw, 3.6rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.04em;
  color: var(--text);
  margin-bottom: 18px;
}
.section-sub {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--text-dim);
  max-width: 760px;
  line-height: 1.75;
}
.header-left { margin-bottom: clamp(40px, 6vw, 64px); }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: rgba(var(--bg-hero-rgb), 0.82);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom-color: var(--border);
}
.navbar__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 100%;
  padding: 0 clamp(20px, 5vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.navbar__logo {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: opacity 0.2s ease;
}
.navbar__logo:hover { opacity: 0.72; }
.navbar__logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  color: var(--orange);
}
.navbar__logo-icon svg { width: 30px; height: 30px; }
.navbar__links { display: flex; align-items: center; gap: 4px; }
.navbar__links a {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: 10px;
  transition: color 0.2s ease, background 0.2s ease;
}
.navbar__links a:hover { color: var(--text); background: var(--border); }
.navbar__actions { display: flex; align-items: center; gap: 8px; }

/* Language pill switch */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--border);
}
.lang-btn {
  padding: 5px 13px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
  color: var(--text-muted);
  transition: all 0.25s var(--ease);
}
.lang-btn.active { background: var(--orange); color: #fff; }
.lang-btn:hover:not(.active) { color: var(--text); }

/* Theme toggle */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  color: var(--text-dim);
  transition: color 0.2s ease, background 0.2s ease;
}
.theme-toggle:hover { color: var(--text); background: var(--border); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme='light'] .theme-toggle .icon-sun { display: block; }
[data-theme='light'] .theme-toggle .icon-moon { display: none; }

.navbar__home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--orange);
  color: #fff;
  box-shadow: 0 0 16px rgba(var(--orange-rgb), 0.35);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.navbar__home:hover { transform: scale(0.95); opacity: 0.9; }
.navbar__home svg { width: 16px; height: 16px; }

.navbar__burger {
  display: none;
  width: 36px; height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  color: var(--text-dim);
}
.navbar__burger svg { width: 20px; height: 20px; }

@media (max-width: 860px) {
  .navbar__links { display: none; }
  .navbar__burger { display: inline-flex; }
}

/* Mobile menu */
.mobile-menu {
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  z-index: 999;
  background: rgba(var(--bg-hero-rgb), 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px clamp(20px, 5vw, 48px) 20px;
  display: none;
  flex-direction: column;
  gap: 4px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-dim);
  padding: 12px 14px;
  border-radius: 12px;
  transition: all 0.2s ease;
}
.mobile-menu a:hover { color: var(--text); background: var(--border); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--bg-hero);
  padding: calc(var(--nav-h) + 56px) 0 88px;
  overflow: hidden;
}
.hero__rule {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--border);
  z-index: 2;
}
.hero__inner {
  position: relative;
  z-index: 3;
  width: 100%;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 30px;
}
.hero__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--orange);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(1.45); }
}
.hero__badge-text {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.hero__badge-sep { color: var(--text-faint); }

.hero__title {
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: -0.045em;
  margin-bottom: 26px;
}
.hero__title-line {
  display: block;
  font-size: clamp(3rem, 9.5vw, 7.4rem);
  color: var(--text);
}
.hero__title-line--accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__title-sub {
  display: block;
  font-size: clamp(1.5rem, 4.4vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-top: 10px;
  color: var(--text);
}

.hero__authors {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin-bottom: 22px;
  font-size: 14px;
  color: var(--text-dim);
}
.hero__authors .author { font-weight: 500; }
.hero__authors .affil {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid var(--border-strong);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.hero__desc {
  font-size: clamp(1rem, 1.7vw, 1.18rem);
  color: var(--text-dim);
  max-width: 640px;
  line-height: 1.78;
  margin-bottom: 36px;
}

.hero__btns { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 56px; }

/* Buttons (homepage pill style) */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 26px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.2s var(--ease), box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease, color 0.2s ease;
}
.btn svg { width: 16px; height: 16px; }
.btn--primary {
  background: var(--orange);
  color: #fff;
  box-shadow: 0 0 0 1px rgba(var(--orange-rgb), 0.5), 0 8px 24px rgba(var(--orange-rgb), 0.3);
}
.btn--primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 0 1px rgba(var(--orange-rgb), 0.7), 0 12px 32px rgba(var(--orange-rgb), 0.42);
}
.btn--ghost {
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
}
.btn--ghost:hover {
  transform: translateY(-2px);
  color: var(--text);
  border-color: var(--orange);
  background: rgba(var(--orange-rgb), 0.06);
}

/* Hero scroll */
.hero__scroll {
  position: absolute;
  bottom: 30px;
  left: clamp(20px, 5vw, 48px);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 3;
  color: var(--text-muted);
}
.hero__scroll-line {
  width: 1px; height: 40px;
  background: var(--orange);
  opacity: 0.5;
  transform-origin: top;
  animation: scroll-pulse 2s ease-in-out infinite;
}
@keyframes scroll-pulse {
  0%, 100% { transform: scaleY(0.3); opacity: 0.3; }
  50% { transform: scaleY(1); opacity: 0.8; }
}
.hero__scroll span {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}
@media (max-width: 640px) { .hero__scroll { display: none; } }

/* ============================================================
   GOALS (4 cards)
   ============================================================ */
.goals-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
@media (max-width: 1000px) { .goals-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .goals-grid { grid-template-columns: 1fr; } }

.goal-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.3s ease, box-shadow 0.4s ease;
}
.goal-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.goal-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}
[data-theme='light'] .goal-card:hover { box-shadow: 0 14px 40px rgba(0, 0, 0, 0.09); }
.goal-card:hover::before { opacity: 1; }
.goal-card__idx {
  font-size: 12px;
  font-weight: 700;
  font-family: var(--mono);
  color: var(--orange);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.goal-card__icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(var(--orange-rgb), 0.1);
  color: var(--orange);
  margin-bottom: 18px;
}
.goal-card__icon svg { width: 22px; height: 22px; }
.goal-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.35;
}
.goal-card__desc { font-size: 0.86rem; color: var(--text-muted); line-height: 1.7; }

/* ============================================================
   METHOD BLOCKS
   ============================================================ */
.method {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
  padding: clamp(40px, 6vw, 64px) 0;
  border-top: 1px solid var(--border);
}
.method:first-of-type { border-top: none; }
/* 核心创新章节末尾：压缩最后一个 method（CDD 面板）底部留白，避免与评估结果章节之间空白过大 */
#innovations .method:last-child { padding-bottom: 0; }
@media (max-width: 860px) { .method { grid-template-columns: 1fr; gap: 24px; } }

.method__aside { position: sticky; top: calc(var(--nav-h) + 28px); }
@media (max-width: 860px) { .method__aside { position: static; } }
.method__num {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.method__name {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 12px;
}
.method__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 4px 11px;
  border-radius: 100px;
  border: 1px solid var(--border);
}

.method__body p {
  color: var(--text-dim);
  font-size: 0.98rem;
  line-height: 1.85;
  margin-bottom: 18px;
}
.method__body p:last-child { margin-bottom: 0; }
.method__body strong { color: var(--text); font-weight: 600; }

/* Feature list (innovations) */
.feat-list { display: grid; gap: 14px; margin: 22px 0; }
.feat-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  transition: border-color 0.3s ease, transform 0.3s var(--ease);
}
.feat-item:hover { border-color: rgba(var(--orange-rgb), 0.35); transform: translateX(3px); }
.feat-item__bullet {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 7px;
  background: rgba(var(--orange-rgb), 0.12);
  color: var(--orange);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}
.feat-item__bullet svg { width: 14px; height: 14px; }
.feat-item__title { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 5px; letter-spacing: -0.01em; }
.feat-item__title strong { color: var(--orange); font-weight: 800; }
.feat-item__desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }

/* Pipeline diagram (innovation 02 — training pipeline) */
.pipeline {
  display: grid;
  gap: 10px;
  margin: 26px 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.pipeline__phase-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.pipeline__phase-tag {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
  border: 1px solid rgba(var(--orange-rgb), 0.35);
  border-radius: 100px;
  padding: 3px 10px;
  white-space: nowrap;
}
.pipeline__phase-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}
.pipeline__flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.pipeline__link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 30px;
  color: var(--text-faint);
}
.pipeline__link::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  border-top: 1px dashed var(--border-strong);
}
.pipeline__link svg {
  position: relative;
  width: 15px;
  height: 15px;
  background: var(--bg-elev);
  padding: 0 8px;
  box-sizing: content-box;
  display: block;
}
.pipeline__inputs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-left: 2px solid rgba(var(--orange-rgb), 0.4);
  padding-left: 12px;
}
.pipeline__node {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 9px 16px;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.pipeline__node--gm {
  color: var(--text-dim);
  border-style: dashed;
}
.pipeline__node--out {
  border-color: rgba(var(--orange-rgb), 0.45);
  color: var(--orange);
  background: rgba(var(--orange-rgb), 0.08);
}
.pipeline__arrow {
  display: inline-flex;
  align-items: center;
  color: var(--text-faint);
  flex-shrink: 0;
  position: relative;
}
.pipeline__arrow svg { width: 16px; height: 16px; display: block; }

/* ---- Pipeline flow animation ----
   A 10s looping light-wave travels along the flow order:
   GM → SFT → RL → DE → (link) → OPD-stage1 → OPD-stage2 → FDE.
   Each element's turn is set via inline --d (animation-delay). */
.pipe-glow {
  animation: pipe-glow 10s linear infinite;
  animation-delay: var(--d, 0s);
}
.pipe-arrow {
  animation: pipe-arrow 10s linear infinite;
  animation-delay: var(--d, 0s);
}
.pipeline__arrow::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 8px rgba(var(--orange-rgb), 0.9);
  opacity: 0;
  animation: pipe-dot 10s linear infinite;
  animation-delay: var(--d, 0s);
  pointer-events: none;
}
@keyframes pipe-glow {
  0%, 2%   { box-shadow: none; }
  5%, 10%  { box-shadow: 0 0 0 1px rgba(var(--orange-rgb), 0.55), 0 0 18px rgba(var(--orange-rgb), 0.35); }
  14%, 100%{ box-shadow: none; }
}
@keyframes pipe-arrow {
  0%, 2%   { color: var(--text-faint); transform: scale(1); }
  5%, 10%  { color: var(--orange); transform: scale(1.2); }
  14%, 100%{ color: var(--text-faint); transform: scale(1); }
}
@keyframes pipe-dot {
  0%, 3%   { opacity: 0; transform: translateX(-2px); }
  5%, 10%  { opacity: 1; }
  13%, 100%{ opacity: 0; transform: translateX(10px); }
}
/* Stage cards below the diagram light up in sync with their OPD nodes */
.pipe-card {
  animation: pipe-card 10s linear infinite;
  animation-delay: var(--d, 0s);
}
@keyframes pipe-card {
  0%, 2%   { border-color: var(--border); background: var(--bg-card); box-shadow: none; }
  5%, 10%  { border-color: rgba(var(--orange-rgb), 0.55); background: rgba(var(--orange-rgb), 0.06); box-shadow: 0 0 18px rgba(var(--orange-rgb), 0.18); }
  14%, 100%{ border-color: var(--border); background: var(--bg-card); box-shadow: none; }
}
@media (prefers-reduced-motion: reduce) {
  .pipe-glow, .pipe-arrow, .pipe-card { animation: none; }
  .pipeline__arrow::after { display: none; }
}

/* Template preview (role template) */
.template {
  font-family: var(--mono);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  margin: 20px 0;
  font-size: 0.82rem;
  line-height: 1.95;
  color: var(--text-dim);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}
.template .h { color: var(--orange); font-weight: 700; }
.template .field { color: var(--text); }
.template .opt { color: var(--text-faint); }

/* ============================================================
   RESULTS — comparison chart
   ============================================================ */
.chart-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 10px;
  margin-bottom: 12px;
}
.chart { min-width: 780px; }
.chart__barsrow {
  position: relative;
  display: flex;
  gap: clamp(8px, 1.5vw, 18px);
  height: 250px;
}
.chart__y { position: absolute; inset: 0; pointer-events: none; }
.chart__y-line {
  position: absolute;
  left: 0; right: 0;
  border-top: 1px dashed var(--border);
}
.chart-group {
  flex: 1;
  min-width: 0;
  display: flex;
  gap: 6px;
  align-items: stretch;
}
.bar-col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
}
.bar {
  width: 100%;
  max-width: 42px;
  height: calc((100% - 22px) * var(--h, 0));
  min-height: 3px;
  border-radius: 6px 6px 2px 2px;
  transition: opacity 0.25s ease;
}
.bar--base { background: var(--chart-base); }
.bar--kuairp {
  background: var(--gradient);
  box-shadow: 0 0 16px rgba(var(--orange-rgb), 0.35);
}
.bar--m2her { background: var(--chart-m2her); }
.bar-col:hover .bar { opacity: 0.8; }
.bar--na {
  height: 26px;
  min-height: 26px;
  border: 1px dashed var(--border-strong);
  border-radius: 6px;
  background: none;
  box-shadow: none;
}
.bar-val {
  font-family: var(--mono);
  font-size: 9.5px;
  line-height: 1;
  color: var(--text-muted);
  white-space: nowrap;
}
.bar-val--hl { color: var(--orange); font-weight: 700; }
.bar-val--na { color: var(--text-faint); }
.chart__labelsrow {
  display: flex;
  gap: clamp(8px, 1.5vw, 18px);
  margin-top: 14px;
}
.chart-label {
  flex: 1;
  min-width: 0;
  text-align: center;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-dim);
  line-height: 1.35;
}
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 26px;
  justify-content: center;
  margin-bottom: 30px;
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12.5px;
  color: var(--text-dim);
}
.legend-dot { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }
.legend-dot--base { background: var(--chart-base); }
.legend-dot--kuairp { background: var(--orange); box-shadow: 0 0 8px rgba(var(--orange-rgb), 0.5); }
.legend-dot--m2her { background: var(--chart-m2her); }
.chart-note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.7;
  max-width: 780px;
}
.chart-foot { margin-top: 6px; }
.chart-more { color: var(--text-faint); transition: color 0.2s ease; }
.chart-more:hover { color: var(--orange); }
.fn-mark {
  font-family: var(--mono);
  font-size: 0.72em;
  font-weight: 700;
  color: var(--orange);
  vertical-align: super;
  line-height: 0;
  margin-left: 1px;
}

/* Conclusion points */
.points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 40px;
}
@media (max-width: 860px) { .points { grid-template-columns: 1fr; } }
.point {
  display: flex;
  gap: 15px;
  align-items: flex-start;
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.3s ease, transform 0.3s var(--ease);
}
.point:hover { border-color: rgba(var(--orange-rgb), 0.4); transform: translateY(-3px); }
.point__icon {
  flex-shrink: 0;
  width: 27px;
  height: 27px;
  border-radius: 8px;
  background: rgba(var(--orange-rgb), 0.12);
  color: var(--orange);
  display: flex;
  align-items: center;
  justify-content: center;
}
.point__icon svg { width: 15px; height: 15px; }
.point__title {
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 6px;
  line-height: 1.4;
}
.point__desc { font-size: 0.84rem; color: var(--text-muted); line-height: 1.7; }

/* ============================================================
   CDD HIGHLIGHT PANEL (original design)
   ============================================================ */
.cdd-panel {
  position: relative;
  border: 1px solid rgba(var(--orange-rgb), 0.32);
  border-radius: 22px;
  padding: clamp(28px, 4.5vw, 48px);
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 80% at 100% 0%, rgba(var(--orange-rgb), 0.09) 0%, transparent 60%),
    var(--bg-card);
  box-shadow:
    0 0 0 1px rgba(var(--orange-rgb), 0.1),
    0 24px 70px rgba(0, 0, 0, 0.3);
}
[data-theme='light'] .cdd-panel { box-shadow: 0 18px 50px rgba(0, 0, 0, 0.08); }
.cdd-panel::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient);
}
.cdd-title {
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: var(--text);
  margin-bottom: 14px;
}
.cdd-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 30px 0 14px;
}
/* CDD mechanism animation (timeline-driven by script.js; grid: rail + 6 token columns) */
.cdd-anim {
  display: grid;
  gap: 10px;
  margin: 6px 0 10px;
  overflow-x: auto;
  padding-bottom: 2px;
  position: relative;
}
.cdd-anim__grid {
  display: grid;
  grid-template-columns: minmax(110px, 150px) repeat(6, minmax(0, 1fr));
  gap: 8px 6px;
  align-items: center;
  min-width: 520px;
}
.cdd-anim__rail {
  display: flex;
  align-items: center;
  justify-content: center; /* Student / Teacher / Σ centered in the left column */
  gap: 8px;
  min-width: 0;
}
.cdd-anim__node {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text);
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 7px 13px;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.cdd-anim__node--prompt { color: var(--text-dim); border-style: dashed; }
.cdd-anim__node--student, .cdd-anim__node--teacher { border-color: rgba(var(--orange-rgb), 0.45); color: var(--orange); }
.cdd-anim__arrow { display: inline-flex; color: var(--text-faint); flex-shrink: 0; }
.cdd-anim__arrow svg { width: 14px; height: 14px; display: block; }
.cdd-anim__tok {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-align: center;
  color: var(--text-dim);
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 6px 0;
  min-width: 0;
  opacity: 0.3;
  transition: opacity 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.cdd-anim__tok.on {
  opacity: 1;
  border-color: rgba(var(--orange-rgb), 0.65);
  box-shadow: 0 0 10px rgba(var(--orange-rgb), 0.25);
}
.cdd-anim__cell {
  position: relative;
  height: 62px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 5px 0 3px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 6px;
  min-width: 0;
}
.cdd-anim__track {
  position: relative;
  flex: 1;
  min-height: 0;
}
.cdd-anim__bar {
  position: absolute;
  left: 18%;
  right: 18%;
  bottom: 0;
  height: var(--h, 0%);
  border-radius: 4px 4px 0 0;
  transform-origin: bottom;
  transform: scaleY(0);
  transition: transform 0.3s ease-out;
}
.cdd-anim__bar.on { transform: scaleY(1); }
.cdd-anim__bar--div { background: rgba(var(--orange-rgb), 0.45); }
.cdd-anim__bar--cum { background: var(--gradient); box-shadow: 0 0 12px rgba(var(--orange-rgb), 0.35); }
.cdd-anim__bar--w { background: var(--green); }
.cdd-anim__tag {
  text-align: center;
  font-family: var(--mono);
  font-size: 9.5px;
  line-height: 1;
  color: var(--text-faint);
  letter-spacing: 0.02em;
}
.cdd-anim__cell--l {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.cdd-anim__l {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--orange);
  background: rgba(var(--orange-rgb), 0.12);
  border: 1px solid rgba(var(--orange-rgb), 0.5);
  border-radius: 8px;
  padding: 6px 0;
  width: 70%;
  text-align: center;
  opacity: 0;
  transform: translateY(5px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.cdd-anim__l.on { opacity: 1; transform: translateY(0); }
.cdd-anim__sum {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--orange);
  background: rgba(var(--orange-rgb), 0.12);
  border: 1px solid rgba(var(--orange-rgb), 0.5);
  opacity: 0;
  transition: opacity 0.3s ease, box-shadow 0.3s ease;
}
.cdd-anim__sum.on { opacity: 1; box-shadow: 0 0 14px rgba(var(--orange-rgb), 0.4); }
/* Dashed box wrapping the whole l1..l6 row (phase C of the animation) */
.cdd-anim__lbox {
  grid-column: 2 / 8;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 6px;
  min-width: 0;
  border: 2px dashed transparent; /* border appears in phase C; l's stay visible as they appear */
  border-radius: 12px;
  padding: 8px 6px;
  transition: border-color 0.35s ease, box-shadow 0.35s ease;
}
.cdd-anim__lbox .cdd-anim__cell { background: transparent; }
.cdd-anim.has-lbox .cdd-anim__lbox {
  border-color: rgba(var(--orange-rgb), 0.6);
  box-shadow: 0 0 18px rgba(var(--orange-rgb), 0.22);
}
/* Σ highlight when the l-box appears */
.cdd-anim.has-lbox .cdd-anim__sum {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(var(--orange-rgb), 0.16), 0 0 24px rgba(var(--orange-rgb), 0.5);
}
/* Curved links (drawn by script.js) and the Σ → Student "Update" label */
.cdd-anim__links {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}
.cdd-anim__links .cdd-link {
  fill: none;
  stroke: rgba(var(--orange-rgb), 0.45);
  stroke-width: 1.5;
  stroke-dasharray: 5 3;
}
.cdd-anim__links .cdd-link--sum {
  stroke: var(--orange);
  stroke-width: 1.8;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.cdd-anim.has-sum .cdd-link--sum { opacity: 1; }
.cdd-anim__upd-label {
  position: absolute;
  transform: translate(-50%, -50%);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--orange);
  background: var(--bg-card);
  border: 1px solid rgba(var(--orange-rgb), 0.45);
  border-radius: 6px;
  padding: 2px 7px;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.cdd-anim.has-sum .cdd-anim__upd-label { opacity: 1; }
.cdd-anim .cdd-anim__note {
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.7;
  margin: 2px 0 0;
}
.cdd-anim .cdd-anim__note code {
  font-family: var(--mono);
  font-size: 0.95em;
  background: var(--bg-elev);
  border-radius: 3px;
  padding: 0 3px;
}

/* ============================================================
   FOOTER / CITATION
   ============================================================ */
.footer {
  position: relative;
  border-top: 1px solid var(--border);
  background: var(--bg-hero);
  padding: clamp(56px, 8vw, 88px) 0 48px;
  overflow: hidden;
}
.footer__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse 50% 60% at 100% 0%, var(--glow-b) 0%, transparent 65%);
}
.footer__inner { position: relative; z-index: 2; }
.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.footer__brand { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 13.5px; color: var(--text); }
.footer__brand img { width: 30px; height: 30px; }
.footer__links { display: flex; flex-wrap: wrap; gap: 22px; }
.footer__links a { font-size: 13px; color: var(--text-muted); transition: color 0.2s ease; }
.footer__links a:hover { color: var(--orange); }
.footer__copy { font-size: 12px; color: var(--text-faint); }

/* ============================================================
   AOS scroll-reveal (driven by _shared/ui.js IntersectionObserver)
   ============================================================ */
[data-aos] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-aos='fade-right'] { transform: translateX(-30px); }
[data-aos='fade-left'] { transform: translateX(30px); }
[data-aos='zoom-in'] { transform: scale(0.96); }
[data-aos].aos-animate { opacity: 1; transform: none; }
[data-aos][data-aos-delay='100'] { transition-delay: 0.1s; }
[data-aos][data-aos-delay='200'] { transition-delay: 0.2s; }
[data-aos][data-aos-delay='300'] { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-aos] { opacity: 1 !important; transform: none !important; }
}