/* ============================================================
   Portal v3 Design Tokens
   柔和专业 · 温暖友好 · 信息清晰
   ============================================================ */

:root {
  /* === 品牌主色 · 暖橙（行动） === */
  --primary: #F97316;
  --primary-hover: #EA580C;
  --primary-active: #C2410C;
  --primary-light: #FFF7ED;
  --primary-lighter: #FFEDD5;
  --primary-foreground: #FFFFFF;
  --primary-grad: linear-gradient(135deg, #F97316 0%, #FB923C 100%);

  /* === 辅助色 · 紫（品牌/定位/选中） === */
  --accent: #7C3AED;
  --accent-hover: #6D28D9;
  --accent-active: #5B21B6;
  --accent-light: #F5F3FF;
  --accent-lighter: #EDE9FE;

  /* === 数据色板 · 4 色教育版 === */
  --data-1: #F97316; --data-1-bg: #FFEDD5;   /* 暖橙 */
  --data-2: #4F46E5; --data-2-bg: #EEF2FF;   /* 靛蓝 */
  --data-3: #059669; --data-3-bg: #D1FAE5;   /* 翡翠 */
  --data-4: #E11D48; --data-4-bg: #FFE4E6;   /* 玫粉 */

  /* === 背景层级 === */
  --bg-page: #FFFBF5;
  --bg-card: #FFFFFF;
  --bg-subtle: #FFF7ED;
  --bg-hover: #FFEDD5;
  --bg-active: #FED7AA;
  --bg-overlay: rgba(31, 41, 55, 0.50);

  /* === 文字色（slate 深色系，对比度提升） === */
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-tertiary: #475569;
  --text-quaternary: #64748B;
  --text-placeholder: #94A3B8;
  --text-on-primary: #FFFFFF;
  --text-on-accent: #FFFFFF;
  --text-link: #7C3AED;

  /* === 边框 === */
  --border: #FFE4D1;
  --border-strong: #FDBA74;
  --border-hover: #FB923C;
  --border-focus: #F97316;
  --border-subtle: #F3F4F6;

  /* === 状态色 === */
  --success: #059669;
  --success-bg: #D1FAE5;
  --success-border: rgba(5, 150, 105, 0.25);

  --warning: #D97706;
  --warning-bg: #FEF3C7;
  --warning-border: rgba(217, 119, 6, 0.25);

  --danger: #DC2626;
  --danger-bg: #FEE2E2;
  --danger-border: rgba(220, 38, 38, 0.25);

  --info: #0EA5E9;
  --info-bg: #E0F2FE;
  --info-border: rgba(14, 165, 233, 0.25);

  /* === 圆角 === */
  --r-sm: 6px;
  --r-md: 10px;
  --r-ctrl: 12px;
  --r-card: 20px;
  --r-lg: 24px;
  --r-pill: 9999px;

  /* === 阴影 · 柔和多层 === */
  --shadow-xs: 0 1px 2px rgba(31, 41, 55, 0.04);
  --shadow-sm: 0 1px 3px rgba(31, 41, 55, 0.05), 0 1px 2px rgba(31, 41, 55, 0.03);
  --shadow-card: 0 1px 3px rgba(31, 41, 55, 0.04), 0 1px 2px rgba(31, 41, 55, 0.02);
  --shadow-hover: 0 12px 32px rgba(249, 115, 22, 0.10), 0 4px 8px rgba(31, 41, 55, 0.04);
  --shadow-lift: 0 20px 40px rgba(31, 41, 55, 0.08), 0 8px 16px rgba(31, 41, 55, 0.04);
  --shadow-popover: 0 12px 32px rgba(31, 41, 55, 0.12), 0 4px 8px rgba(31, 41, 55, 0.04);
  --shadow-modal: 0 24px 64px rgba(31, 41, 55, 0.18), 0 8px 16px rgba(31, 41, 55, 0.08);
  --shadow-btn: 0 4px 14px rgba(249, 115, 22, 0.30);
  --shadow-btn-hover: 0 8px 24px rgba(249, 115, 22, 0.40), 0 2px 4px rgba(249, 115, 22, 0.20);
  --shadow-glow: 0 0 0 4px rgba(249, 115, 22, 0.10);
  --shadow-glow-accent: 0 0 0 4px rgba(124, 58, 237, 0.10);
  --shadow-inset: inset 0 1px 2px rgba(255, 255, 255, 0.50);
  --shadow-card-glow: 0 20px 40px rgba(249, 115, 22, 0.12), 0 8px 16px rgba(31, 41, 55, 0.04);

  /* === 渐变 === */
  --gradient-mesh: radial-gradient(at 0% 0%, rgba(249, 115, 22, 0.06), transparent 50%),
                    radial-gradient(at 100% 0%, rgba(79, 70, 229, 0.04), transparent 50%),
                    radial-gradient(at 50% 100%, rgba(255, 255, 255, 0.5), transparent 50%);
  --gradient-hero: linear-gradient(135deg, #FFF7ED 0%, #FFFBF5 60%, #FFFFFF 100%);
  --gradient-card: linear-gradient(180deg, #FFFFFF 0%, #FFFCF7 100%);
  --gradient-orange: linear-gradient(135deg, #F97316 0%, #FB923C 100%);
  --gradient-indigo: linear-gradient(135deg, #7C3AED 0%, #A78BFA 100%);
  --gradient-emerald: linear-gradient(135deg, #059669 0%, #10B981 100%);
  --gradient-rose: linear-gradient(135deg, #E11D48 0%, #F43F5E 100%);

  /* === 间距 · 8pt 网格 === */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;

  /* === 字号 === */
  --fs-display: 48px;
  --fs-h1: 32px;
  --fs-h2: 24px;
  --fs-h3: 18px;
  --fs-body-lg: 18px;
  --fs-body: 16px;
  --fs-body-sm: 15px;
  --fs-caption: 14px;
  --fs-overline: 13px;
  --fs-data-lg: 32px;
  --fs-data: 24px;
  --fs-data-sm: 16px;
  --fs-menu: 16px;

  /* === 字重 === */
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  /* === 行高 === */
  --lh-tight: 1.2;
  --lh-snug: 1.3;
  --lh-normal: 1.5;
  --lh-relaxed: 1.65;

  /* === 字间距 === */
  --ls-tight: -0.02em;
  --ls-normal: 0;
  --ls-wide: 0.02em;
  --ls-wider: 0.08em;

  /* === 过渡 === */
  --tr-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
  --tr-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --tr-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --tr-bounce: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* === 布局 === */
  --sidebar-w: 240px;
  --topbar-h: 72px;
  --content-max: 1440px;
  --ring: 0 0 0 3px rgba(124, 58, 237, 0.20);

  /* === 字体 === */
  --font-sans: "Alibaba PuHuiTi 3.0", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-content: "LXGW WenKai", "Alibaba PuHuiTi 3.0", serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, monospace;
}

/* === 基础重置 === */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { font-size: 14px; }
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-page);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--text-link); text-decoration: none; transition: color var(--tr-fast); }
a:hover { color: var(--primary-hover); }

button {
  font-family: inherit;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

input, select, textarea {
  font-family: inherit;
  font-size: var(--fs-body);
  color: var(--text-primary);
}

ul, ol { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: none;
  box-shadow: var(--ring);
  border-radius: var(--r-ctrl);
}

.num { font-variant-numeric: tabular-nums; }
.hidden { display: none !important; }

/* === 滚动条 === */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: var(--r-pill); }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

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