@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-top: #141a32;
  --bg-mid: #090d1a;
  --bg-bottom: #03050b;

  --text: #f5f7ff;
  --muted: rgba(226, 232, 240, 0.74);
  --muted-2: rgba(226, 232, 240, 0.56);

  --line: rgba(255, 255, 255, 0.12);

  --shadow-lg: 0 28px 90px rgba(0, 0, 0, 0.34);
  --shadow-md: 0 18px 54px rgba(0, 0, 0, 0.26);

  --radius-xxl: 32px;

  --container: 1280px;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
  background: radial-gradient(ellipse at top, var(--bg-top) 0%, var(--bg-mid) 48%, var(--bg-bottom) 100%) fixed;
}

body {
  min-height: 100vh;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: transparent;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

img,
video {
  display: block;
  max-width: 100%;
}

:focus-visible {
  outline: 3px solid rgba(96, 165, 250, 0.32);
  outline-offset: 2px;
}

/* 背景效果 */
.scene-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(5, 8, 20, 0.16) 0%, rgba(5, 8, 20, 0.8) 100%);
  opacity: 0.16;
  transform: scale(1.04);
}

.stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
      radial-gradient(1.5px 1.5px at 25px 35px, rgba(255, 255, 255, 1), rgba(0, 0, 0, 0)),
      radial-gradient(2px 2px at 150px 200px, rgba(210, 190, 255, 0.95), rgba(0, 0, 0, 0)),
      radial-gradient(1px 1px at 50px 160px, rgba(255, 255, 255, 0.95), rgba(0, 0, 0, 0)),
      radial-gradient(1.5px 1.5px at 100px 120px, rgba(255, 255, 255, 1), rgba(0, 0, 0, 0)),
      radial-gradient(1px 1px at 190px 70px, rgba(255, 255, 255, 1), rgba(0, 0, 0, 0)),
      radial-gradient(1.5px 1.5px at 10px 230px, rgba(255, 170, 220, 0.86), rgba(0, 0, 0, 0)),
      radial-gradient(2px 2px at 210px 40px, rgba(255, 220, 140, 0.86), rgba(0, 0, 0, 0)),
      radial-gradient(1.5px 1.5px at 230px 145px, rgba(130, 220, 255, 0.86), rgba(0, 0, 0, 0));
  background-repeat: repeat;
  background-size: 280px 280px;
  opacity: 0.52;
  animation: moveStars 80s linear infinite;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.05;
  background-image:
      linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 84px 84px;
  mask-image: radial-gradient(circle at center, black 14%, transparent 82%);
  -webkit-mask-image: radial-gradient(circle at center, black 14%, transparent 82%);
}

.glow-effect {
  position: fixed;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.14;
  pointer-events: none;
  z-index: 1;
}

.glow-1 {
  top: -220px;
  left: -180px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.42) 0%, transparent 70%);
  animation: drift 20s ease-in-out infinite;
}

.glow-2 {
  right: -180px;
  bottom: -220px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.38) 0%, transparent 70%);
  animation: drift 26s ease-in-out infinite reverse;
}

/* 页面布局 */
.page-shell {
  position: relative;
  z-index: 10;
  width: min(var(--container), 100%);
  margin: 0 auto;
  padding: 18px 24px 88px;
}

.site-header {
  position: sticky;
  top: 18px;
  z-index: 80;
}

.header-stack {
  display: grid;
  gap: 12px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 14px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--line);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  box-shadow: var(--shadow-lg);
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-mark {
  width: 46px;
  height: 46px;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}

.brand-copy {
  min-width: 0;
}

.brand-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.02em;
  line-height: 1.15;
}

.brand-domain {
  margin-top: 3px;
  font-size: 0.76rem;
  color: rgba(226, 232, 240, 0.58);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.nav-center {
  display: flex;
  align-items: center;
  gap: 24px;
  min-width: 0;
}

.nav-link {
  color: rgba(226, 232, 240, 0.74);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: color 0.28s ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: #ffffff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.ghost-btn,
.primary-btn,
.secondary-btn,
.lang-btn,
.menu-toggle {
  border: none;
  cursor: pointer;
  transition: all 0.28s ease;
}

.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  padding: 0 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 600;
}

.ghost-btn:hover {
  background: rgba(255, 255, 255, 0.09);
}

.lang-container {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.lang-btn {
  min-width: 62px;
  height: 38px;
  border-radius: 12px;
  background: transparent;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.88rem;
  font-weight: 700;
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
}

.lang-btn.is-active {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.22), rgba(56, 189, 248, 0.22));
  color: #ffffff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.1);
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.09);
}

.menu-bars {
  position: relative;
  width: 18px;
  height: 14px;
}

.menu-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: #ffffff;
  transition: all 0.28s ease;
}

.menu-bars span:nth-child(1) {
  top: 0;
}

.menu-bars span:nth-child(2) {
  top: 6px;
}

.menu-bars span:nth-child(3) {
  top: 12px;
}

.menu-toggle.is-active .menu-bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle.is-active .menu-bars span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-active .menu-bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-menu-panel {
  display: none;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--line);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  box-shadow: var(--shadow-md);
}

.mobile-menu-panel.is-open {
  display: block;
  border-radius: 24px;
}

.mobile-menu-inner {
  padding: 20px;
  display: grid;
  gap: 20px;
}

.mobile-menu-group {
  display: grid;
  gap: 10px;
}

.mobile-menu-title {
  font-size: 0.72rem;
  font-weight: 700;
  color: rgba(226, 232, 240, 0.44);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.mobile-menu-link {
  display: block;
  color: rgba(226, 232, 240, 0.82);
  font-size: 0.94rem;
  font-weight: 600;
  padding: 10px 12px;
  border-radius: 12px;
  transition: 0.2s ease;
}

.mobile-menu-link:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}

.mobile-menu-cta {
  width: 100%;
}

.hero-section {
  margin-top: 22px;
}

.doc-kicker {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #e7edff;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 14px;
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.primary-btn {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.96), rgba(56, 189, 248, 0.96));
  color: #ffffff;
  box-shadow: 0 16px 36px rgba(56, 189, 248, 0.18), 0 12px 30px rgba(139, 92, 246, 0.16);
}

.primary-btn:hover {
  transform: translateY(-2px);
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

.secondary-btn:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.08);
}

/* Section通用样式 */
.section {
  margin-top: 22px;
}

/* Footer */
.footer-panel {
  margin-top: 22px;
  padding: 30px;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--line);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  box-shadow: var(--shadow-md);
}

.footer-bottom {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  color: rgba(148, 163, 184, 0.72);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
}

.doc-intro {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.6fr);
  gap: 22px;
  padding: 34px;
  border-radius: var(--radius-xxl);
  overflow: hidden;
  animation: fadeInUp 0.55s ease both;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--line);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  box-shadow: var(--shadow-md);
}

.doc-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
      radial-gradient(circle at 14% 12%, rgba(139, 92, 246, 0.1), transparent 30%),
      radial-gradient(circle at 86% 16%, rgba(56, 189, 248, 0.1), transparent 28%);
}

.doc-meta,
.doc-stats-panel {
  position: relative;
  z-index: 1;
}

.doc-meta {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.doc-title {
  margin-top: 18px;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.05em;
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 0%, #dfe9ff 46%, #b5d6ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.doc-desc {
  margin-top: 18px;
  max-width: 66ch;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.92;
}

.doc-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.doc-stats-panel {
  padding: 24px;
  border-radius: 28px;
  background:
      linear-gradient(160deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.025)),
      radial-gradient(circle at 18% 18%, rgba(139, 92, 246, 0.12), transparent 34%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: grid;
  gap: 16px;
}

.stat-item {
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.stat-label {
  color: rgba(226, 232, 240, 0.62);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.stat-value {
  margin-top: 8px;
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 650;
  line-height: 1.6;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.status-badge.completed {
  background: linear-gradient(135deg, rgba(52, 211, 153, 0.14), rgba(96, 165, 250, 0.14));
}

/* ========== PDF 查看器 ========== */
.section {
  margin-top: 22px;
}

.viewer-container {
  position: relative;
  border-radius: var(--radius-xxl);
  overflow: hidden;
  animation: fadeInUp 0.5s ease both;
  animation-delay: 0.08s;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--line);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  box-shadow: var(--shadow-md);
}

.pdf-viewer-wrapper {
  position: relative;
  width: 100%;
  height: 75vh;
  min-height: 500px;
  background: rgba(0, 0, 0, 0.2);
}

.pdf-iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  background: #1a1a1a;
}

.fallback-message {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 40px 20px;
  text-align: center;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
}

.fallback-message.visible {
  display: flex;
}

.fallback-icon {
  width: 64px;
  height: 64px;
  color: rgba(251, 191, 36, 0.8);
  stroke-width: 1.5;
}

.fallback-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
}

.fallback-desc {
  max-width: 42ch;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.7;
}

/* 查看器提示栏 */
.viewer-hint {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.04));
}

.hint-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted-2);
  font-size: 0.88rem;
}

.hint-item svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
  flex-shrink: 0;
  opacity: 0.7;
}

.hint-link {
  color: rgba(186, 230, 253, 0.9);
  font-weight: 600;
  transition: color 0.28s ease;
}

.hint-link:hover {
  color: #ffffff;
}

/* ========== 响应式 ========== */
@media (max-width: 1160px) {
  .doc-intro {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 960px) {
  .viewer-hint {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 18px;
  }

  .hint-item {
    width: 100%;
    font-size: 0.84rem;
  }
}

@media (max-width: 640px) {

  .page-shell {
    padding: 12px 12px 56px;
  }

  .topbar {
    border-radius: 18px;
    padding: 10px;
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .nav-center {
    display: none;
  }

  .nav-actions {
    width: 100%;
    justify-content: space-between;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
  }

  .brand-name {
    font-size: 0.88rem;
  }

  .brand-domain {
    font-size: 0.7rem;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .ghost-btn {
    display: none;
  }

  .doc-intro {
    padding: 20px;
    border-radius: 24px;
  }

  .doc-kicker {
    font-size: 0.72rem;
    padding: 8px 13px;
  }

  .doc-title {
    font-size: 2rem;
  }

  .doc-desc {
    font-size: 0.92rem;
    line-height: 1.78;
  }

  .doc-actions {
    flex-direction: column;
    width: 100%;
  }


  .section {
    margin-top: 22px;
  }

  .pdf-viewer-wrapper {
    height: 60vh;
    min-height: 400px;
  }

  .viewer-hint {
    padding: 12px 16px;
  }

  .hint-item svg {
    width: 16px;
    height: 16px;
  }

  .hint-item {
    font-size: 0.82rem;
  }

}

/* ========== 滚动条样式 ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.02);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.16);
}

@keyframes moveStars {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 500px 1000px;
  }
}

@keyframes drift {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(36px, 28px) scale(1.05);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}