/* ============================================================
   Global Design Tokens — 巨龟科技 (Spec-aligned)
   ============================================================ */
:root {
  /* Brand palette — per spec */
  --color-brand-primary: #1A2744;      /* 深藏青色，主标题、强调文本 */
  --color-brand-accent: #C8963E;       /* 金铜色，ROI 高亮、阈值警报线、选中指示条 */
  --color-text-primary: #1A1A1A;       /* 正文主色 */
  --color-text-secondary: #6B7280;     /* 副标题、辅助文本灰 */
  --color-surface: #FAFAF9;            /* 页面底色（极浅奶油白） */
  --color-surface-card: #FFFFFF;       /* 卡片底色 */
  --color-grid-line: #E5E5E5;          /* 1px 极细网格线 */
  --color-footer-dark: #111827;        /* 页脚深色背景 */
  --color-cta-bg: #1A2744;             /* CTA 按钮底色 */
  --color-cta-text: #FFFFFF;           /* CTA 按钮文字 */

  /* Legacy compat aliases (used in some transitions) */
  --color-ink: #1A2744;
  --color-ink-soft: #2A3F5F;
  --color-accent: #C8963E;
  --color-accent-soft: #efe4cc;
  --color-graphite: #1A1A1A;
  --color-mute: #6B7280;
  --color-line: #E5E5E5;
  --color-line-strong: #d2d8e2;
  --color-canvas: #FAFAF9;
  --color-canvas-alt: #F6F8FB;
  --color-alert: #C8963E;

  /* Typography */
  --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: "Inter", "Helvetica Neue", "PingFang SC", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;

  /* Typography scale — per spec */
  --text-h1: clamp(2.5rem, 5vw, 4rem);       /* 主标题，最大 64px */
  --text-h2: clamp(1.75rem, 3vw, 2.5rem);    /* 区块标题 */
  --text-h3: 1.25rem;                          /* 卡片标题 */
  --text-body: 1rem;                           /* 正文 */
  --text-caption: 0.875rem;                    /* 辅助说明 */
  --text-data: 1.5rem;                         /* ROI 数据数字 */

  /* Breakpoints (语义化) */
  --breakpoint-mobile: 768px;
  --breakpoint-tablet: 1024px;
  --breakpoint-desktop: 1440px;

  /* Spacing scale — 统一间距 */
  --space-xs: 0.25rem;    /* 4px */
  --space-sm: 0.5rem;     /* 8px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2.5rem;     /* 40px */
  --space-2xl: 4rem;      /* 64px */
  --space-3xl: 6rem;      /* 96px */

  /* Shadows — 统一深度 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 32px rgba(0,0,0,0.1);

  /* Transitions — 统一时序 */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-reveal: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-breathe: 1.5s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ============================================================
   Base reset
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  color: var(--color-brand-primary);
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  line-height: 1.15;
}

p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ============================================================
   Brand photo filter — 保持原图全彩高亮
   ============================================================ */
.brand-photo-filter {
  object-fit: cover;
  width: 100%;
  height: 100%;
  filter: none;
  opacity: 1;
}

/* ============================================================
   Section container — 安全边距，全局禁止贴边
   ============================================================ */
.section-container {
  padding: 2rem 1.5rem;
  max-width: 1280px;
  margin: 0 auto;
}

/* Legacy alias */
.container-safe {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

@media (min-width: 768px) {
  .container-safe { padding-inline: 2rem; }
}

@media (min-width: 1440px) {
  .section-container,
  .container-safe {
    max-width: 1280px; /* 锁定最大宽度，防止无限拉伸 */
  }
}

/* ============================================================
   Section vertical rhythm
   ============================================================ */
.section-pad {
  padding-block: 5rem;
}
@media (min-width: 768px) {
  .section-pad { padding-block: 7rem; }
}

/* ============================================================
   CTA — 矩形直角，纯实色 (per spec)
   ============================================================ */
.cta-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.625rem 1.5rem;
  background-color: var(--color-cta-bg);
  color: var(--color-cta-text);
  font-weight: 600;
  font-size: var(--text-body);
  letter-spacing: 0.02em;
  border: 1px solid var(--color-cta-bg);
  border-radius: 0;
  transition: background-color 0.2s ease;
}
.cta-primary:hover {
  background-color: #2A3F5F;
}

.cta-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.625rem 1.5rem;
  background-color: transparent;
  color: var(--color-brand-primary);
  font-weight: 600;
  font-size: var(--text-body);
  border: 1px solid var(--color-brand-primary);
  border-radius: 0;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.cta-ghost:hover {
  background-color: var(--color-brand-primary);
  color: var(--color-cta-text);
}

/* ============================================================
   Hero 数据网格 — gap:1px 透出网格线 (per spec)
   ============================================================ */
.data-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px; /* 透出背景色形成 1px 极细网格线 */
  background-color: var(--color-grid-line);
  border: 1px solid var(--color-grid-line);
}
.data-cell {
  background-color: var(--color-surface);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100px;
}
.data-grid .metric-value {
  font-family: var(--font-mono);
  font-size: var(--text-data);
  font-weight: 700;
  color: var(--color-brand-primary);
}
.data-grid .metric-label {
  font-family: var(--font-sans);
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-top: 0.5rem;
}

/* ============================================================
   Focus ring — 可访问性 (per spec)
   ============================================================ */
:focus-visible {
  outline: 2px solid var(--color-brand-accent);
  outline-offset: 2px;
}

/* ============================================================
   Reduced motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ============================================================
   Print styles (基础)
   ============================================================ */
/* ============================================================
   Sub-page shared header
   ============================================================ */
.page-header {
  padding: 4rem 0 3rem;
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
}
.page-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-h1);
  color: var(--color-brand-primary);
  margin: 0 0 1rem;
}
.page-subtitle {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin: 0;
}

/* ============================================================
   Careers page
   ============================================================ */
.careers-section {
  padding: 3rem 0;
  border-top: 1px solid var(--color-grid-line);
}
.careers-section-title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 700;
  color: var(--color-brand-primary);
  margin: 0 0 2rem;
}
.careers-perks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}
.careers-perk {
  padding: 1.75rem;
  background: var(--color-surface-card);
  border: 1px solid var(--color-grid-line);
}
.careers-perk h3 {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-brand-primary);
  margin: 0 0 0.5rem;
}
.careers-perk p {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}
.positions-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.position-card {
  display: flex;
  gap: 2rem;
  align-items: center;
  padding: 1.75rem 2rem;
  background: var(--color-surface-card);
  border: 1px solid var(--color-grid-line);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.position-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  border-color: var(--color-brand-accent);
}
.position-info { flex: 1; min-width: 0; }
.position-title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-brand-primary);
  margin: 0 0 0.25rem;
}
.position-meta {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
}
.position-desc {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}
.position-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
  flex-shrink: 0;
}
.position-apply {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--color-brand-primary);
  color: #FFFFFF;
  border: none;
  font-family: var(--font-sans);
  font-size: var(--text-caption);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.position-apply:hover { background: #2A3F5F; }
.position-apply.is-copied { background: #065F46; }
.position-email-hint {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}
.positions-tip {
  margin-top: 2rem;
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.positions-tip strong { color: var(--color-brand-primary); }

@media (max-width: 768px) {
  .position-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
    padding: 1.5rem;
  }
  .position-actions { align-items: flex-start; }
}

/* ============================================================
   Toast (careers copy-email feedback)
   ============================================================ */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-brand-primary);
  color: #FFFFFF;
  font-size: var(--text-caption);
  font-weight: 500;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
}
.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast-icon { font-size: 1rem; }

/* ============================================================
   Legal pages (privacy / terms)
   ============================================================ */
.legal-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 4rem 0;
}
.legal-content h2 {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-brand-primary);
  margin: 2rem 0 0.75rem;
}
.legal-content h2:first-child { margin-top: 0; }
.legal-content p {
  font-size: var(--text-body);
  color: var(--color-text-primary);
  line-height: 1.8;
  margin: 0 0 1rem;
}
.legal-content ul {
  padding-left: 1.5rem;
  margin: 0 0 1rem;
}
.legal-content li {
  font-size: var(--text-body);
  color: var(--color-text-primary);
  line-height: 1.8;
  margin-bottom: 0.25rem;
}

/* ============================================================
   全局微交互与动效规范 (Micro-interactions & Animations)
   ============================================================ */

/* ① 数据脉搏注入 (Data Pulse) */
.data-grid {
  position: relative;
  overflow: hidden;
}
.data-grid::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background: linear-gradient(
    135deg,
    transparent 0%,
    transparent 45%,
    rgba(200, 150, 62, 0.06) 50%,
    transparent 55%,
    transparent 100%
  );
  background-size: 300% 300%;
  animation: grid-pulse 4s ease-in-out infinite;
}
@keyframes grid-pulse {
  0%, 100% { background-position: 0% 0%; }
  50% { background-position: 100% 100%; }
}
.metric-value {
  font-variant-numeric: tabular-nums;
}

/* ② 磁吸与引力反馈 (Magnetic CTA) */
.header-cta,
.hero-cta,
.footer-cta-button,
.page-cta-button {
  transition: transform 0.5s cubic-bezier(0.25, 0.1, 0.25, 1.2);
  will-change: transform;
}

/* ③ 错落水流式显现 (Staggered Reveal) */
.stagger-reveal {
  opacity: 0;
  transform: translateY(20px);
  will-change: transform, opacity;
}
.stagger-reveal.is-revealed {
  animation: stagger-fade-up 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes stagger-fade-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ④ SVG 神经元流转 (SVG Path Drawing) */
.svg-path-draw {
  stroke-dasharray: var(--path-length, 500);
  stroke-dashoffset: var(--path-length, 500);
  transition: stroke-dashoffset 0.01s linear;
}
.svg-path-draw.is-drawing {
  animation: draw-path 2.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
@keyframes draw-path {
  to { stroke-dashoffset: 0; }
}
.alert-node-pulse {
  animation: node-pulse 2s ease-in-out infinite;
  transform-origin: center;
  transform-box: fill-box;
}
@keyframes node-pulse {
  0%, 100% { opacity: 0.6; r: 6; }
  50% { opacity: 1; r: 9; }
}

/* ⑤ 温度复苏 (Temperature Revival) */
.case-card-image,
.listing-card-image,
.blog-card-image {
  overflow: hidden;
}
.brand-photo-filter {
  filter: none;
  opacity: 1;
  transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  will-change: transform;
}
.case-card:hover .brand-photo-filter,
.listing-card:hover .brand-photo-filter,
.blog-card:hover .brand-photo-filter {
  transform: scale(1.03);
}
@media (max-width: 768px) {
  .case-card:active .brand-photo-filter,
  .listing-card:active .brand-photo-filter,
  .blog-card:active .brand-photo-filter {
    transform: scale(1.03);
  }
}

/* ⑥ B2B 专属克制显现动画 (Fade-in Up) */
.reveal-item {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
  will-change: opacity, transform;
}
.reveal-item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ⑦ 数据加密揭示 (Data Decryption Reveal) */
.crypto-text {
  display: inline-block;
  min-width: 3ch;
  color: var(--color-brand-accent);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ⑧ 可变字体张力呼吸 (Variable Typography Tension) */
.tension-heading {
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: -0.02em;
  transition: font-weight var(--transition-breathe);
  will-change: font-weight;
}
.tension-heading.is-breathed {
  font-weight: 800;
}

/* ⑨ 页面切换“深呼吸”过渡 */
body.page-transition-ready {
  opacity: 0;
  transform: translateY(10px);
  transition:
    opacity 0.3s cubic-bezier(0, 0, 0.2, 1),
    transform 0.3s cubic-bezier(0, 0, 0.2, 1);
}
body.page-transition-ready.page-entered {
  opacity: 1;
  transform: translateY(0);
}
body.page-transition-ready.page-leaving {
  opacity: 0;
  transform: translateY(-5px);
  transition:
    opacity 0.2s cubic-bezier(0.4, 0, 1, 1),
    transform 0.2s cubic-bezier(0.4, 0, 1, 1);
}

/* ⑩ 数据脉搏完成后的克制回响 */
.metric-value {
  display: inline-block;
  min-width: 5ch;
}
.metric-value.pulse-complete {
  animation: pulse-glow 0.6s ease-out;
}
@keyframes pulse-glow {
  0% { color: var(--color-brand-accent); }
  100% { color: var(--color-brand-primary); }
}

/* ⑪ 统一卡片交互与导航状态 */
.case-card,
.listing-card,
.solution-card,
.news-card,
.partner-logo,
.trust-item {
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}
.case-card:hover,
.listing-card:hover,
.solution-card:hover,
.news-card:hover,
.trust-item:hover {
  border-color: rgba(200, 150, 62, 0.5);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.nav-link[aria-current="page"] {
  color: var(--color-brand-primary);
  border-bottom-color: var(--color-brand-accent);
  font-weight: 700;
}

/* ⑫ 移动端响应式降级 */
@media (max-width: 768px) {
  .section-container {
    padding-inline: 1.25rem;
  }
  .page-header {
    padding: 3rem 0 2rem;
    text-align: left;
  }
  .data-grid {
    grid-template-columns: 1fr;
  }
  .metric-value {
    min-width: 4ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal-item,
  .stagger-reveal {
    opacity: 1 !important;
    transform: none !important;
  }
  body.page-transition-ready {
    opacity: 1 !important;
    transform: none !important;
  }
  .tension-heading {
    font-weight: 800;
  }
}

@media print {
  .site-header,
  .footer-cta,
  .header-hamburger {
    display: none;
  }
  .hero {
    min-height: auto;
  }
}