/* ============================================================
   设计令牌系统（Design Tokens）
   复刻 DeepSeek Harness 官网的玻璃拟态设计语言
   亮色 / 暗色双主题 + 管理员可自定义品牌色 --brand
   ============================================================ */

:root {
  /* 文字 */
  --ds-color-text-primary: #171c26;
  --ds-color-text-primary-bluish: #0f1830;
  --ds-color-text-link-blue: #234792;
  --ds-color-text-secondary: rgba(0, 0, 0, .72);
  --ds-color-text-description: rgba(0, 0, 0, .62);
  --ds-color-text-inverse: #fff;
  --ds-color-text-placeholder: #8a94a6;

  /* 品牌色（后台可自定义覆盖） */
  --ds-color-brand: #4d6bfe;
  --ds-color-brand-deep: #3a65c2;
  --ds-color-brand-medium-reverse: #4176e6;
  --ds-color-brand-light-reverse: #73a3d2;

  /* 背景 */
  --ds-color-bg-page: #f8f7f6;
  --ds-color-bg-surface-1: #ffffff;
  --ds-color-bg-surface-2: rgba(255, 255, 255, .72);
  --ds-color-bg-surface-3: rgba(23, 28, 38, .03);
  --ds-color-bg-surface-5: rgba(23, 28, 38, .05);
  --ds-color-bg-overlay: #ffffff;
  --ds-color-bg-code: rgba(23, 28, 38, .055);
  --ds-color-bg-hover: rgba(23, 28, 38, .05);
  --ds-color-bg-input: rgba(255, 255, 255, .9);
  --ds-color-scrollbar: rgba(0, 0, 0, .18);
  --ds-header-bg: rgba(248, 247, 246, .82);

  /* 边框 */
  --ds-color-border-subtle: rgba(0, 0, 0, .06);
  --ds-color-border-default: rgba(0, 0, 0, .1);
  --ds-color-border-divider: rgba(0, 0, 0, .08);
  --ds-color-border-strong: rgba(0, 0, 0, .2);
  --ds-color-border-secondary: rgba(9, 45, 78, .14);

  /* 按钮 */
  --ds-btn-primary-bg: #1a1615;
  --ds-btn-primary-text: #fff;
  --ds-btn-primary-border: transparent;
  --ds-btn-primary-hover-bg: hsla(0, 0%, 100%, .3);
  --ds-btn-secondary-bg: hsla(0, 0%, 100%, .4);
  --ds-btn-secondary-text: #1e232c;
  --ds-btn-secondary-border: rgba(9, 45, 78, .18);
  --ds-btn-secondary-hover-bg: rgba(0, 0, 0, .05);
  --ds-btn-ghost-bg: transparent;
  --ds-btn-ghost-text: #121c31;
  --ds-btn-ghost-border: transparent;
  --ds-btn-ghost-hover-bg: rgba(0, 0, 0, .04);

  /* 圆角 */
  --ds-radius-pill: 100px;
  --ds-radius-card: 24px;
  --ds-radius-panel: 16px;
  --ds-radius-media: 10px;
  --ds-radius-input: 12px;
  --ds-radius-sm: 8px;

  /* 间距 */
  --ds-space-1: 4px;
  --ds-space-2: 8px;
  --ds-space-3: 12px;
  --ds-space-4: 16px;
  --ds-space-5: 24px;
  --ds-space-6: 32px;
  --ds-space-7: 40px;
  --ds-space-8: 56px;
  --ds-space-9: 80px;
  --ds-space-10: 120px;

  /* 效果 */
  --ds-blur-glass: 12px;
  --ds-shadow-card: 0 0 0 1px rgba(23, 28, 38, .05), 0 1px 2px rgba(23, 28, 38, .04), 0 8px 24px rgba(23, 28, 38, .06);
  --ds-shadow-float: 0 24px 56px rgba(23, 28, 38, .12);
  --ds-ease: cubic-bezier(.16, 1, .3, 1);
  --ds-card-hover-border: rgba(77, 107, 254, .4);
  --ds-card-hover-glow: rgba(77, 107, 254, .16);

  /* 字体（无外部加载，系统字体栈） */
  --ds-font-body: "DM Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ds-font-display: "Host Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ds-font-mono: "Fragment Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", monospace;

  /* 品牌主色（管理员可在后台覆盖） */
  --brand: var(--ds-color-brand);
  --brand-soft: rgba(77, 107, 254, .13);
  --brand-text: #4d6bfe;
  --brand-2: #7c5cff;
  --hero-orb-1: rgba(77, 107, 254, .42);
  --hero-orb-2: rgba(124, 92, 255, .32);
  --hero-orb-3: rgba(14, 165, 233, .28);
}

[data-theme="dark"] {
  /* 文字 */
  --ds-color-text-primary: #fff;
  --ds-color-text-primary-bluish: #fff;
  --ds-color-text-secondary: hsla(0, 0%, 100%, .8);
  --ds-color-text-description: hsla(0, 0%, 100%, .62);
  --ds-color-text-placeholder: hsla(0, 0%, 100%, .34);
  --ds-color-text-inverse: #0a0a0a;

  /* 品牌 */
  --ds-color-brand: #6799fe;
  --ds-color-brand-deep: #fff;
  --ds-color-brand-medium-reverse: #fff;
  --ds-color-brand-light-reverse: #73a3d2;

  /* 背景 */
  --ds-color-bg-page: #0a0a0a;
  --ds-color-bg-surface-1: hsla(0, 0%, 100%, .06);
  --ds-color-bg-surface-2: hsla(0, 0%, 100%, .04);
  --ds-color-bg-surface-3: hsla(0, 0%, 100%, .02);
  --ds-color-bg-surface-5: hsla(0, 0%, 100%, .12);
  --ds-color-bg-overlay: #262626;
  --ds-color-bg-code: rgba(0, 0, 0, .35);
  --ds-color-bg-hover: hsla(0, 0%, 100%, .06);
  --ds-color-bg-input: hsla(0, 0%, 100%, .08);
  --ds-color-scrollbar: hsla(0, 0%, 100%, .2);
  --ds-header-bg: rgba(10, 10, 10, .72);

  /* 边框 */
  --ds-color-border-subtle: hsla(0, 0%, 100%, .08);
  --ds-color-border-default: hsla(0, 0%, 100%, .06);
  --ds-color-border-divider: hsla(0, 0%, 100%, .25);
  --ds-color-border-strong: hsla(0, 0%, 100%, .24);
  --ds-color-border-secondary: hsla(0, 0%, 100%, .2);

  /* 按钮 */
  --ds-btn-primary-bg: #fff;
  --ds-btn-primary-text: #0a0a0a;
  --ds-btn-primary-border: transparent;
  --ds-btn-primary-hover-bg: rgba(0, 0, 0, .2);
  --ds-btn-secondary-bg: hsla(0, 0%, 100%, .1);
  --ds-btn-secondary-text: #fff;
  --ds-btn-secondary-border: hsla(0, 0%, 100%, .28);
  --ds-btn-secondary-hover-bg: hsla(0, 0%, 100%, .2);
  --ds-btn-ghost-bg: transparent;
  --ds-btn-ghost-text: #fff;
  --ds-btn-ghost-border: transparent;
  --ds-btn-ghost-hover-bg: hsla(0, 0%, 100%, .08);

  /* 效果 */
  --ds-shadow-card: hsla(0, 0%, 100%, .12) 0px 1px 0px 0px inset, 0 12px 32px rgba(0, 0, 0, .35);
  --ds-shadow-float: 0 24px 56px rgba(0, 0, 0, .5);
  --ds-card-hover-border: rgba(103, 153, 254, .45);
  --ds-card-hover-glow: rgba(103, 153, 254, .12);

  /* 品牌 */
  --brand: var(--ds-color-brand);
  --brand-soft: rgba(103, 153, 254, .14);
  --brand-text: #6799fe;
  --hero-orb-1: rgba(103, 153, 254, .5);
  --hero-orb-2: rgba(124, 58, 237, .35);
  --hero-orb-3: rgba(14, 165, 233, .3);
}

/* 主题平滑过渡 */
html.theme-anim,
html.theme-anim *,
html.theme-anim *::before,
html.theme-anim *::after {
  transition: background-color .45s ease, color .45s ease, border-color .45s ease, box-shadow .45s ease, fill .45s ease !important;
}

/* ============ 基础 ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--ds-font-body);
  background: var(--ds-color-bg-page);
  color: var(--ds-color-text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--brand); color: var(--ds-color-text-inverse); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--ds-color-scrollbar); border-radius: 8px; border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: var(--ds-color-border-strong); background-clip: content-box; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--ds-space-5); }

/* ============ 通用组件 ============ */
/* 玻璃卡片 */
.glass-card {
  background: var(--ds-color-bg-surface-1);
  border: 1px solid var(--ds-color-border-subtle);
  border-radius: var(--ds-radius-card);
  backdrop-filter: blur(var(--ds-blur-glass));
  -webkit-backdrop-filter: blur(var(--ds-blur-glass));
  box-shadow: var(--ds-shadow-card);
}
.card-hover { transition: transform .45s var(--ds-ease), box-shadow .45s var(--ds-ease), border-color .45s var(--ds-ease); }
.card-hover:hover {
  transform: translateY(-6px);
  border-color: var(--ds-card-hover-border);
  box-shadow: var(--ds-shadow-float), 0 0 0 1px var(--ds-card-hover-glow), 0 0 32px var(--ds-card-hover-glow);
}

/* 按钮（液体填充 hover，复刻 Harness） */
.ds-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--ds-radius-pill);
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  font-family: var(--ds-font-body);
  color: var(--ds-color-text-primary);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  user-select: none;
  isolation: isolate;
  overflow: hidden;
  white-space: nowrap;
  transition: transform .25s var(--ds-ease), box-shadow .3s var(--ds-ease), border-color .3s ease, color .3s ease;
}
.ds-btn::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0; bottom: 0;
  border-radius: inherit;
  background: var(--btn-fill, var(--ds-color-bg-hover));
  transform: scaleY(0);
  transform-origin: 50% 100%;
  transition: transform .45s var(--ds-ease);
  z-index: -1;
}
.ds-btn:hover::after { transform: scaleY(1); }
.ds-btn:active { transform: scale(.96); }

.ds-btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2, var(--ds-color-brand-deep)));
  color: #fff;
  box-shadow: 0 4px 18px var(--ds-card-hover-glow), 0 1px 2px rgba(23, 28, 38, .08);
}
.ds-btn-primary::after { background: rgba(255, 255, 255, .18); }
.ds-btn-primary:hover { color: #fff; box-shadow: 0 6px 26px var(--ds-card-hover-glow), 0 1px 2px rgba(23, 28, 38, .08); }
[data-theme="dark"] .ds-btn-primary {
  background: var(--ds-btn-primary-bg);
  color: var(--ds-btn-primary-text);
  box-shadow: 0 4px 20px rgba(0, 0, 0, .3);
}
[data-theme="dark"] .ds-btn-primary::after { background: var(--brand); }
[data-theme="dark"] .ds-btn-primary:hover { color: #0a0a0a; }

.ds-btn-secondary { background: var(--ds-btn-secondary-bg); color: var(--ds-btn-secondary-text); border-color: var(--ds-btn-secondary-border); backdrop-filter: blur(var(--ds-blur-glass)); -webkit-backdrop-filter: blur(var(--ds-blur-glass)); }
.ds-btn-secondary::after { background: var(--ds-btn-secondary-hover-bg); }
.ds-btn-secondary:hover { border-color: var(--ds-btn-secondary-hover-border, var(--ds-color-border-strong)); }
[data-theme="dark"] .ds-btn-secondary:hover { border-color: hsla(0, 0%, 100%, .42); }

.ds-btn-ghost { background: var(--ds-btn-ghost-bg); color: var(--ds-btn-ghost-text); border-color: var(--ds-btn-ghost-border); font-weight: 500; }
.ds-btn-ghost::after { background: var(--ds-btn-ghost-hover-bg); }
.ds-btn-ghost:hover { border-color: var(--ds-color-border-default); }
[data-theme="dark"] .ds-btn-ghost:hover { border-color: hsla(0, 0%, 100%, .28); }

.ds-btn-sm { padding: 8px 18px; font-size: 13.5px; }
.ds-btn-lg { padding: 15px 34px; font-size: 16px; }

/* 徽章 / 标签 */
.ds-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--ds-radius-pill);
  font-size: 12.5px;
  font-weight: 600;
  background: var(--brand-soft);
  color: var(--brand-text);
  border: 1px solid var(--ds-card-hover-border);
}

/* 区块标题 */
.section-head { text-align: center; max-width: 640px; margin: 0 auto clamp(32px, 4vw, 48px); }
.section-head .kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--brand-text);
  margin-bottom: var(--ds-space-3);
}
.section-head h2 {
  font-family: var(--ds-font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.25;
}
.section-head .sub { margin-top: var(--ds-space-3); color: var(--ds-color-text-description); font-size: 16px; }

/* ============ 滚动渐入动画 ============ */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s var(--ds-ease), transform .8s var(--ds-ease); transition-delay: var(--d, 0s); will-change: opacity, transform; }
.reveal.in { opacity: 1; transform: none; }

/* ============ 主题切换器 ============ */
.theme-switch {
  display: inline-flex;
  align-items: center;
  height: 34px;
  padding: 3px;
  border-radius: var(--ds-radius-pill);
  border: 1px solid var(--ds-color-border-default);
  background: var(--ds-color-bg-surface-2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 2px rgba(23, 28, 38, .04);
}
[data-theme="dark"] .theme-switch { box-shadow: inset 0 1px 2px rgba(0, 0, 0, .4); }
.theme-switch button {
  height: 100%;
  min-width: 34px;
  padding: 0 7px;
  display: inline-flex; align-items: center; justify-content: center;
  border: none; background: transparent; cursor: pointer;
  border-radius: var(--ds-radius-pill);
  font-size: 13.5px; color: var(--ds-color-text-description);
  transition: all .25s var(--ds-ease);
}
.theme-switch button:hover { color: var(--ds-color-text-primary); }
.theme-switch button.active {
  background: var(--ds-color-bg-overlay);
  color: var(--ds-color-text-primary);
  box-shadow: 0 1px 6px rgba(23, 28, 38, .14), 0 0 0 1px var(--ds-color-border-subtle);
  transform: scale(1.02);
}
[data-theme="dark"] .theme-switch button.active { box-shadow: 0 1px 8px rgba(0, 0, 0, .5), 0 0 0 1px rgba(255, 255, 255, .08); }

/* ============ Toast ============ */
#toast-root {
  position: fixed;
  bottom: 28px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity .35s var(--ds-ease), transform .35s var(--ds-ease);
}
#toast-root.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#toast-root .toast {
  background: var(--ds-color-bg-overlay);
  color: var(--ds-color-text-primary);
  border: 1px solid var(--ds-color-border-default);
  border-radius: var(--ds-radius-pill);
  padding: 12px 22px;
  font-size: 14px;
  box-shadow: var(--ds-shadow-float);
  display: flex; align-items: center; gap: 8px;
}

/* ============ 无障碍：减弱动效 ============ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  html { scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .orb, .login-orb { animation: none !important; }
}