/* AI 任务可靠性评测台 — 作品集级展示（研究向、克制） */

:root {
  --ink: #0c1222;
  --ink-soft: #1e2a44;
  --muted: #5c6b86;
  --line: rgba(255, 255, 255, 0.08);
  --surface: #0f172a;
  --surface-up: #152238;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.1);
  --accent: #3b82f6;
  --accent-dim: #2563eb;
  --text-on-dark: #e8edf5;
  --text-dim: #94a3b8;
  --page-bg: #f1f4f8;
  --section-alt: #e8eef6;
  --shadow: 0 8px 32px rgba(15, 23, 42, 0.12);
  --shadow-soft: 0 4px 20px rgba(15, 23, 42, 0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --maxw: 1040px;
  --nav-h: 52px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--page-bg);
}

body.gate-active {
  overflow: hidden;
}

/* ---------- Gate ---------- */

.gate {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: var(--surface);
  color: var(--text-on-dark);
  transition: opacity 0.65s ease, visibility 0.65s ease;
}

.gate--out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.gate__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 120% 80% at 50% -20%, rgba(59, 130, 246, 0.35), transparent 55%),
    radial-gradient(ellipse 80% 60% at 100% 50%, rgba(99, 102, 241, 0.2), transparent 50%),
    linear-gradient(165deg, #0f172a 0%, #1e293b 45%, #0f172a 100%);
  background-size: 100% 100%, 100% 100%, 200% 200%;
  animation: gateShift 18s ease-in-out infinite;
}

@keyframes gateShift {
  0%,
  100% {
    background-position: 0% 0%, 100% 50%, 0% 50%;
  }
  50% {
    background-position: 0% 0%, 0% 80%, 100% 50%;
  }
}

.gate__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 520px;
  animation: gateFadeIn 0.9s ease-out;
}

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

.gate__title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.6rem, 4vw, 2rem);
  font-weight: 750;
  letter-spacing: -0.03em;
}

.gate__subtitle {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  color: #93c5fd;
  font-weight: 500;
}

.gate__lead {
  margin: 0 0 1.75rem;
  color: var(--text-dim);
  font-size: 0.98rem;
}

.gate__btn {
  appearance: none;
  border: none;
  cursor: pointer;
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  border-radius: 999px;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.45);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.gate__btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(37, 99, 235, 0.5);
}

.gate__btn:active {
  transform: translateY(0);
}

/* ---------- App shell（进入前不可见，避免误读） ---------- */

.app {
  opacity: 0;
  transition: opacity 0.75s ease 0.12s;
}

.app--visible {
  opacity: 1;
}

/* ---------- Sticky nav ---------- */

.nav-sticky {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(241, 244, 248, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

.nav-sticky__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.65rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
}

.nav-sticky a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-sticky a:hover {
  color: var(--accent-dim);
  border-bottom-color: var(--accent);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 3.5rem 0 4rem;
  overflow: hidden;
  background: var(--surface);
  color: var(--text-on-dark);
}

.hero__bg {
  position: absolute;
  inset: 0;
  opacity: 0.9;
  background: radial-gradient(ellipse 100% 70% at 50% -30%, rgba(59, 130, 246, 0.25), transparent 50%),
    linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  animation: heroPulse 22s ease-in-out infinite;
}

@keyframes heroPulse {
  0%,
  100% {
    opacity: 0.85;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.02);
  }
}

.hero__wrap {
  position: relative;
  z-index: 1;
}

.app--visible .hero__wrap {
  animation: heroContentIn 0.85s ease-out 0.08s both;
}

@keyframes heroContentIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__title {
  margin: 0 0 0.6rem;
  font-size: clamp(1.75rem, 4.5vw, 2.25rem);
  font-weight: 780;
  letter-spacing: -0.03em;
}

.hero__hook {
  margin: 0 0 1.25rem;
  font-size: 1.15rem;
  color: #93c5fd;
  font-weight: 600;
}

.hero__text {
  margin: 0 0 1.5rem;
  max-width: 38em;
  color: var(--text-dim);
  font-size: 1.02rem;
}

.hero__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hero__tags li {
  padding: 0.45rem 0.95rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  font-size: 0.88rem;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ---------- Sections ---------- */

.section {
  padding: 4rem 0;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.section--visible {
  opacity: 1;
  transform: translateY(0);
}

.section--alt {
  background: var(--section-alt);
}

.section--limits {
  background: linear-gradient(180deg, #e8eef6 0%, #f1f4f8 100%);
}

.section__title {
  font-size: 1.5rem;
  font-weight: 750;
  margin: 0 0 0.75rem;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.section__lead {
  margin: 0 0 1.75rem;
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 40em;
}

.section__text {
  margin: 0 0 1rem;
  max-width: 42em;
  color: var(--ink-soft);
}

.section__note {
  margin: 1.5rem 0 0;
  font-size: 0.92rem;
  color: var(--muted);
  max-width: 42em;
}

.subsection__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
  color: var(--ink);
}

/* Cards grid */

.grid-cards {
  display: grid;
  gap: 1.1rem;
}

.grid-cards--4 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.grid-cards--3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: var(--surface-up);
  color: var(--text-on-dark);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.35rem 1.35rem 1.25rem;
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.section--alt .card {
  background: #fff;
  color: var(--ink);
  border-color: rgba(15, 23, 42, 0.08);
  box-shadow: var(--shadow-soft);
}

.card--hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(59, 130, 246, 0.35);
}

.card__title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.card__head {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.card__body {
  margin: 0;
  font-size: 0.92rem;
  color: inherit;
  opacity: 0.92;
  line-height: 1.6;
}

.section--alt .card__body {
  color: var(--muted);
}

.tag {
  display: inline-block;
  margin-left: 0.35rem;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-dim);
  opacity: 0.9;
}

.callout {
  margin: 1.5rem 0;
  padding: 1.2rem 1.35rem;
  background: #fff;
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
  box-shadow: var(--shadow-soft);
}

.callout--emphasis p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.stack-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel {
  background: #fff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--radius-sm);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow-soft);
}

.panel__title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.panel__body {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.65;
}

/* Insight card */

.insight-card {
  background: linear-gradient(135deg, #1e3a5f 0%, #1e293b 100%);
  color: var(--text-on-dark);
  padding: 1.5rem 1.5rem 1.35rem;
  border-radius: var(--radius);
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}

.insight-card__title {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.insight-card__list {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.65;
}

.insight-card__list li {
  margin-bottom: 0.4rem;
}

.load-line {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.error-banner {
  display: none;
  padding: 0.85rem 1rem;
  background: #fff7ed;
  border: 1px solid #fdba74;
  border-radius: var(--radius-sm);
  color: #7c2d12;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.error-banner.visible {
  display: block;
}

/* Tables */

.table-panel {
  margin-bottom: 1.5rem;
}

.table-panel__caption {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
  color: var(--ink-soft);
}

.table-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.table-scroll {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(15, 23, 42, 0.1);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.data-table th,
.data-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.data-table th {
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
  font-weight: 650;
  color: var(--ink-soft);
  font-size: 0.82rem;
  text-transform: none;
  letter-spacing: 0.01em;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody td {
  color: var(--ink-soft);
}

/* Charts */

.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.35rem;
}

.chart-card {
  margin: 0;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: var(--shadow-soft);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.chart-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.chart-card img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.chart-card figcaption {
  padding: 1rem 1.15rem 1.15rem;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.65;
}

.chart-card figcaption strong {
  color: var(--ink-soft);
}

/* Limits */

.limit-list {
  margin: 0;
  padding-left: 1.2rem;
  max-width: 42em;
  color: var(--ink-soft);
}

.limit-list li {
  margin-bottom: 0.55rem;
}

/* Footer */

.footer {
  padding: 2.5rem 0 3rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid rgba(15, 23, 42, 0.08);
}

/* Reduced motion */

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

  html {
    scroll-behavior: auto;
  }
}