/* ============================================
   SpringCore Design System v4.0 (public/styles/global.css)
   与 src/styles/global.css 镜像版本（BaseLayout `<link>` 引用）
   ─────────────────────────────────────────────
   完整 Color Scale + 语义 Token + WCAG AA 自查
   ============================================ */

/* ============================================
   Layer 1 · COLOR SCALES
   ============================================ */
:root {
  /* ── Spring Green Scale ── */
  --spring-50:  #F5FBF6;
  --spring-100: #E8F7EB;
  --spring-200: #D1F0D8;
  --spring-300: #B8E6BE;
  --spring-400: #8FD694;
  --spring-500: #58B368;
  --spring-600: #4AA35B;
  --spring-700: #368A47;
  --spring-800: #2E6F3C;
  --spring-900: #214F2C;

  /* ── Accent Yellow ── */
  --accent-50:  #FFFCEC;
  --accent-100: #FFF8D7;
  --accent-200: #FFF0AF;
  --accent-300: #FFE58A;
  --accent-400: #FFD76A;
  --accent-500: #FFC94A;

  /* ── Sky Scale ── */
  --sky-50:  #F4FBFE;
  --sky-100: #EAF7FD;
  --sky-200: #D6EFFB;
  --sky-300: #B8E3F5;
  --sky-400: #9AD4ED;
  --sky-500: #83C5E8;

  /* ── Neutral · Slate-based ── */
  --neutral-50:  #F8FAFC;
  --neutral-100: #F1F5F9;
  --neutral-200: #E5E7EB;
  --neutral-300: #CBD5E1;
  --neutral-400: #9CA3AF;
  --neutral-500: #6B7280;
  --neutral-600: #4B5563;
  --neutral-700: #374151;
  --neutral-800: #1F2937;
  --neutral-900: #111827;

  /* ── 自然点缀（多 Agent 系统） ── */
  --mint-300: #B8E8D0;
  --mint-500: #7DD3B0;
  --mint-700: #4FA889;
  --moss-300: #B8D1C3;
  --moss-500: #6FA38A;
  --moss-700: #3F7762;
  --clay-300: #E8C9AE;
  --clay-500: #D9A77A;
  --clay-700: #A57446;
  --blossom-300: #F0D2CD;
  --blossom-500: #E8B8B0;

  /* ── Status ── */
  --success-500: #5BB97A;
  --success-soft: rgba(91, 185, 122, 0.14);
  --warning-500: #E8A848;
  --warning-soft: rgba(232, 168, 72, 0.14);
}

/* ============================================
   Layer 2 · SEMANTIC TOKENS
   ============================================ */
:root {
  /* Surface */
  --sc-bg: var(--spring-50);
  --sc-surface: #FFFFFF;
  --sc-surface-soft: var(--neutral-100);
  --sc-surface-elev: #FFFFFF;
  --sc-surface-tint-spring: var(--spring-100);
  --sc-surface-tint-accent: var(--accent-100);
  --sc-surface-tint-sky: var(--sky-100);

  /* Text */
  --sc-text: var(--neutral-800);
  --sc-text-main: var(--neutral-800);
  --sc-text-muted: var(--neutral-500);
  --sc-text-subtle: var(--neutral-500);
  --sc-text-soft: var(--neutral-400);
  --sc-text-invert: #FFFFFF;
  --sc-text-on-brand: var(--neutral-900);

  /* Border */
  --sc-border: rgba(0, 0, 0, 0.06);
  --sc-border-soft: rgba(0, 0, 0, 0.04);
  --sc-border-strong: rgba(0, 0, 0, 0.10);
  --sc-border-card-hover: var(--spring-300);

  /* Brand */
  --sc-brand: var(--spring-500);
  --sc-brand-hover: var(--spring-600);
  --sc-brand-active: var(--spring-700);
  --sc-brand-soft: var(--spring-100);
  --sc-brand-softer: var(--spring-50);
  --sc-brand-deep: var(--spring-800);

  /* Link */
  --sc-link: var(--spring-700);
  --sc-link-hover: var(--spring-800);

  /* Button · Primary (AA) */
  --sc-button-primary-bg: var(--spring-700);
  --sc-button-primary-bg-hover: var(--spring-800);
  --sc-button-primary-bg-active: var(--spring-900);
  --sc-button-primary-text: #FFFFFF;

  --sc-button-brand-bg: var(--spring-500);
  --sc-button-brand-bg-hover: var(--spring-600);
  --sc-button-brand-bg-active: var(--spring-700);
  --sc-button-brand-text: var(--neutral-900);

  /* Card */
  --sc-card-bg: var(--sc-surface);
  --sc-card-border: var(--sc-border);
  --sc-card-border-hover: var(--sc-border-card-hover);
  --sc-card-shadow-hover: 0 18px 48px rgba(88, 179, 104, 0.10);

  /* Status */
  --sc-status-green-text: var(--spring-800);
  --sc-status-green-bg: rgba(91, 185, 122, 0.14);
  --sc-status-blue-text: #2F6B8A;
  --sc-status-blue-bg: rgba(135, 199, 238, 0.18);
  --sc-status-pink-text: #B0596E;
  --sc-status-pink-bg: rgba(232, 184, 176, 0.20);
  --sc-status-violet-text: #5B6FA0;
  --sc-status-violet-bg: rgba(125, 211, 176, 0.16);
  --sc-status-cyan-text: #2F6B8A;
  --sc-status-cyan-bg: rgba(135, 199, 238, 0.18);
  --sc-status-amber-text: var(--sc-warning-text, #8A6020);
  --sc-status-amber-bg: var(--sc-warning-soft);

  --sc-success: var(--success-500);
  --sc-success-soft: var(--success-soft);
  --sc-success-text: var(--spring-800);
  --sc-warning: var(--warning-500);
  --sc-warning-soft: var(--warning-soft);
  --sc-warning-text: #8A6020;

  /* Shadow */
  --sc-shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.05);
  --sc-shadow-md: 0 18px 48px rgba(0, 0, 0, 0.06);
  --sc-shadow-glow: 0 12px 36px rgba(88, 179, 104, 0.30);

  /* Gradient */
  --sc-gradient-hero:
    linear-gradient(135deg,
      var(--accent-200) 0%,
      var(--spring-200) 30%,
      var(--spring-500) 70%,
      #6EC8B4 100%);
  --sc-gradient-brand:
    linear-gradient(90deg,
      var(--spring-300) 0%,
      var(--spring-500) 50%,
      #6EC8B4 100%);
  --sc-gradient-soft:
    linear-gradient(135deg,
      var(--spring-100) 0%,
      var(--accent-100) 60%,
      var(--sky-100) 100%);
  --sc-gradient-page-bg:
    radial-gradient(circle at 12% -10%, rgba(255, 243, 166, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 95% 110%, rgba(168, 216, 248, 0.18) 0%, transparent 45%);

  /* Container */
  --sc-content-width: 760px;
  --sc-page-width: 1180px;

  /* Motion */
  --sc-transition: 250ms cubic-bezier(0.22, 0.61, 0.36, 1);

  /* 向后兼容别名（见 src/styles/global.css 同段注释）*/
  --sc-primary: var(--sc-brand-active);
  --sc-primary-soft: var(--sc-brand-soft);
  --sc-primary-deep: var(--sc-brand-active);
  --sc-primary-hover: var(--sc-brand-hover);
  --sc-accent: var(--sc-warning);
  --sc-accent-soft: var(--sc-warning-soft);
  --sc-secondary: var(--mint-500);
  --sc-secondary-soft: rgba(125, 211, 176, 0.18);
  --sc-sky: var(--sky-300);
  --sc-sky-soft: var(--sky-100);
}

/* 暗色模式 · 深森林主题 */
@media (prefers-color-scheme: dark) {
  :root {
    --sc-bg: #0F1410;
    --sc-surface: #141B16;
    --sc-surface-soft: #19231C;
    --sc-text: #F0F4ED;
    --sc-text-main: #F0F4ED;
    --sc-text-muted: #A8B3A5;
    --sc-text-subtle: #6F7A6E;
    --sc-text-on-brand: #0F1410;
    --sc-brand: #A0E5A6;
    --sc-brand-hover: #B5EFBA;
    --sc-brand-active: #7BC884;
    --sc-brand-soft: rgba(160, 229, 166, 0.18);
    --sc-link: #A0E5A6;
    --sc-link-hover: #B5EFBA;
    --sc-button-primary-bg: var(--spring-500);
    --sc-button-primary-bg-hover: var(--spring-400);
    --sc-button-primary-text: #0F1410;
    --sc-border: rgba(255, 255, 255, 0.08);
    --sc-border-soft: rgba(255, 255, 255, 0.05);
    --sc-shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.45);
    --sc-shadow-md: 0 18px 48px rgba(0, 0, 0, 0.55);
    --sc-shadow-glow: 0 12px 36px rgba(160, 229, 166, 0.20);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "MiSans", "HarmonyOS Sans SC", sans-serif;
  font-feature-settings: "ss01", "cv11";
}

body {
  font-family: inherit;
  background: var(--sc-bg);
  background-image: var(--sc-gradient-page-bg);
  background-attachment: fixed;
  color: var(--sc-text);
  line-height: 1.6;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--sc-text);
  letter-spacing: -0.01em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  color: var(--sc-text-muted);
  margin-bottom: 1rem;
}

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

:focus-visible {
  outline: 2px solid var(--sc-brand);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Utility */
.container {
  max-width: var(--sc-page-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.content-width {
  max-width: var(--sc-content-width);
  margin: 0 auto;
}

/* ============================================
   Buttons (utility .btn / .btn-primary / .btn-secondary)
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1.5rem;
  height: 48px;
  border-radius: 16px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--sc-transition);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--sc-button-primary-bg);
  color: var(--sc-button-primary-text);
  box-shadow: var(--sc-shadow-glow);
}
.btn-primary:hover {
  background: var(--sc-button-primary-bg-hover);
  transform: translateY(-2px);
  box-shadow: 0 18px 40px rgba(54, 138, 71, 0.34);
  color: #FFFFFF;
}
.btn-primary:active {
  background: var(--sc-button-primary-bg-active);
  transform: translateY(0);
}

.btn-secondary {
  background: var(--sc-surface);
  color: var(--sc-text-main);
  border: 1px solid var(--sc-border);
}
.btn-secondary:hover {
  background: var(--sc-surface);
  border-color: var(--sc-brand);
  transform: translateY(-2px);
  color: var(--sc-brand-active);
}

/* ============================================
   Card
   ============================================ */
.card {
  background: var(--sc-card-bg);
  border-radius: var(--sc-radius-md);
  border: 1px solid var(--sc-card-border);
  box-shadow: var(--sc-shadow-sm);
  transition: all var(--sc-transition);
}
.card:hover {
  box-shadow: var(--sc-card-shadow-hover);
  transform: translateY(-4px);
  border-color: var(--sc-card-border-hover);
}

/* ============================================
   Badge / Tag / Code
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-blue   { background: var(--sc-status-blue-bg);   color: var(--sc-status-blue-text); }
.badge-pink   { background: var(--sc-status-pink-bg);   color: var(--sc-status-pink-text); }
.badge-violet { background: var(--sc-status-violet-bg); color: var(--sc-status-violet-text); }
.badge-green  { background: var(--sc-status-green-bg);  color: var(--sc-status-green-text); }
.badge-cyan   { background: var(--sc-status-cyan-bg);   color: var(--sc-status-cyan-text); }
.badge-amber  { background: var(--sc-status-amber-bg);  color: var(--sc-status-amber-text); }

.tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: var(--sc-surface-soft);
  color: var(--sc-text-muted);
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--sc-transition);
}
.tag:hover {
  background: var(--sc-brand-soft);
  color: var(--sc-brand-active);
}

code {
  background: linear-gradient(135deg, var(--sc-brand-soft), var(--sc-warning-soft));
  color: var(--sc-brand-active);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  font-weight: 500;
}

pre {
  background: #1A1F1B;
  color: #E4F0DC;
  padding: 1.5rem;
  border-radius: var(--sc-radius-md);
  overflow-x: auto;
  border: 1px solid rgba(0, 0, 0, 0.10);
}
pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-weight: 400;
}

/* ============================================
   Article Content (used by BaseLayout body)
   ============================================ */
.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--sc-text);
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--sc-border-soft);
}
.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--sc-text);
  margin: 2rem 0 0.75rem;
}
.article-content p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--sc-text-muted);
  margin-bottom: 1.5rem;
}
.article-content ul,
.article-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}
.article-content li {
  margin-bottom: 0.5rem;
  color: var(--sc-text-muted);
}
.article-content blockquote {
  border-left: 4px solid var(--sc-brand);
  padding: 1rem 1.5rem;
  background: linear-gradient(135deg, var(--sc-brand-soft), var(--sc-surface-tint-accent));
  margin: 1.5rem 0;
  border-radius: 0 var(--sc-radius-sm) var(--sc-radius-sm) 0;
  color: var(--sc-text);
}
.article-content blockquote p {
  margin: 0;
  color: var(--sc-text);
}

/* Article Card Cover（保留此处独立规则以兼容历史文章卡片）*/
.article-content .sc-article-card-cover,
.sc-article-card-cover {
  width: calc(100% + 48px);
  margin: -24px -24px 16px;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--sc-radius-md) var(--sc-radius-md) 0 0;
  background: var(--sc-surface-soft);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.5rem; }
  .container { padding: 0 1rem; }
  body { overflow-x: hidden; }
}
@media (max-width: 480px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
}