/* ==========================================================================
   《信号志 · SIGNAL》—— 董达个人作品集核心样式库
   原则：瑞士海报骨架，霓虹信号血液。90% 纸墨秩序，10% 霓虹对撞。
   规范：全站单文件，零 CDN，零外部字体，零外部 JS，直角无阴影，仅亮色常态。
   ========================================================================== */

:root {
  /* ── 地基：纸与墨（90% 面积）── */
  --paper:       #f4f2ed;   /* 暖白纸：瑞士海报底色，非纯白 */
  --surface:     #ffffff;   /* 卡片/图表区：纯白，制造与纸的微弱层级 */
  --ink:         #111111;   /* 墨：标题、正文，近纯黑 */
  --ink-2:       #4d4d4d;   /* 次级文字 */
  --ink-3:       #8f8f8f;   /* 图注、元信息 */
  --line:        #111111;   /* 瑞士风格的线必须是黑的、实的 */
  --line-thin:   #d8d5ce;   /* 次级分隔线（仅表格内部与点阵） */

  /* ── 信号双色（10% 面积，高纯度对撞）── */
  --magenta:     #d946ef;   /* 霓虹洋红：主动作、当前态、主编号 */
  --magenta-ink: #a21caf;   /* 洋红的文字级变体（小字可读性） */
  --cyan:        #0891b2;   /* 电光青：链接、辅助节点、次级编号 */
  --cyan-ink:    #0e7490;   /* 青的文字级变体 */

  /* 兼容与别名映射 */
  --bg:          var(--paper);
  --bg-subtle:   #ece9e2;
  --accent:      var(--magenta);
  --accent-hover:#c026d3;
  --accent-soft: rgba(217, 70, 239, 0.08);
  --commercial:  var(--cyan);
  --commercial-soft: rgba(8, 145, 178, 0.08);

  /* ── 字体系统（瑞士 = 无衬线 Grotesk 的天下）── */
  --grot: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --wrap: 1200px;
}

/* 全站铁律：0 圆角、0 阴影 */
*, *::before, *::after {
  box-sizing: border-box;
  border-radius: 0 !important;
  box-shadow: none !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  background-color: var(--paper);
  overflow-x: hidden;
}

body {
  margin: 0;
  /* 背景色只放在 html 上：若 body 也设背景，其背景会绘制在负 z-index
     的信号场三层之上，把背景动画整个盖住（背景传播规则）。 */
  background-color: transparent;
  color: var(--ink);
  font-family: var(--grot);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

code, kbd, samp {
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* ══════════════════════════════════════════════════════════════════════════
   信号场背景（Signal Field）三层系统
   Layer 1 · 点阵底纹（静态，CSS only）
   Layer 2 · 套印漂移（慢动，CSS only）
   Layer 3 · 信号脉冲（事件动，Canvas JS）
   ══════════════════════════════════════════════════════════════════════════ */

/* Layer 1 · 点阵底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  background-image: radial-gradient(circle at 6px 6px, #b7b1a3 1.2px, transparent 1.2px);
  background-size: 12px 12px;
  background-position: 0 0;
  opacity: 0.45;
  pointer-events: none;
}

/* Layer 2 · 套印漂移（氛围主体，慢到像呼吸） */
.field-blob-container {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}

.field-blob {
  position: absolute;
  filter: blur(50px);
  mix-blend-mode: multiply;
  pointer-events: none;
}

.field-blob--magenta {
  width: 70vw;
  height: 70vw;
  top: -18vw;
  left: -18vw;
  background: radial-gradient(circle, rgba(217, 70, 239, 0.17) 0%, rgba(217, 70, 239, 0.06) 45%, rgba(217, 70, 239, 0) 70%);
  animation: driftMagenta 28s ease-in-out infinite alternate;
}

.field-blob--cyan {
  width: 70vw;
  height: 70vw;
  bottom: -18vw;
  right: -18vw;
  background: radial-gradient(circle, rgba(8, 145, 178, 0.15) 0%, rgba(8, 145, 178, 0.05) 45%, rgba(8, 145, 178, 0) 70%);
  animation: driftCyan 36s ease-in-out infinite alternate;
}

@keyframes driftMagenta {
  0%   { transform: translate(0, 0); }
  100% { transform: translate(8vw, 6vw); }
}

@keyframes driftCyan {
  0%   { transform: translate(0, 0); }
  100% { transform: translate(-8vw, -6vw); }
}

/* Layer 3 · 信号脉冲（Canvas） */
#signal-field,
#cellular-automata-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  width: 100%;
  height: 100%;
}

@media (prefers-reduced-motion: reduce) {
  body::before { opacity: 0.3; }
  .field-blob-container { display: none; }
  #signal-field { display: none; }
}

@media (max-width: 768px) {
  #signal-field { display: none; }
}

/* ══════════════════════════════════════════════════════════════════════════
   招牌技法（Signatures）
   ══════════════════════════════════════════════════════════════════════════ */

/* 4.1 套印交叠（Overprint）：mix-blend-mode: multiply 生成印刷套印紫 */
.overprint {
  position: relative;
  display: inline-block;
}
.overprint::before, .overprint::after {
  content: "";
  position: absolute;
  inset: 0;
  mix-blend-mode: multiply;
  pointer-events: none;
}
.overprint::before {
  background: var(--magenta);
  transform: translate(-3px, -3px);
}
.overprint::after {
  background: var(--cyan);
  transform: translate(3px, 3px);
}

/* 4.4 规线标记（Registration Marks） */
.reg-mark-box {
  position: relative;
}
.reg-mark {
  position: absolute;
  width: 16px;
  height: 16px;
  pointer-events: none;
  z-index: 5;
}
.reg-mark::before, .reg-mark::after {
  content: "";
  position: absolute;
  background: var(--line);
}
.reg-mark::before {
  top: 0;
  bottom: 0;
  left: 7.5px;
  width: 1px;
}
.reg-mark::after {
  left: 0;
  right: 0;
  top: 7.5px;
  height: 1px;
}
.reg-mark--tl { top: -8px; left: -8px; }
.reg-mark--tr { top: -8px; right: -8px; }
.reg-mark--bl { bottom: -8px; left: -8px; }
.reg-mark--br { bottom: -8px; right: -8px; }

@media (max-width: 768px) {
  .reg-mark { display: none; }
}

/* 4.3 双色下划线系统 */
a {
  color: inherit;
  text-decoration: none;
}
p a, li a, .signal-link {
  color: var(--ink);
  border-bottom: 1px solid var(--cyan);
  transition: border-bottom 0.2s ease, color 0.2s ease;
  padding-bottom: 1px;
}
p a:hover, li a:hover, .signal-link:hover {
  border-bottom: 3px solid var(--magenta);
  color: var(--magenta-ink);
}

/* ══════════════════════════════════════════════════════════════════════════
   基础版式与网格系统
   ══════════════════════════════════════════════════════════════════════════ */

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
}

h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.15;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--ink);
}
h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--ink);
}
h3 {
  font-size: 20px;
  line-height: 1.35;
  font-weight: 600;
  margin: 24px 0 10px;
  color: var(--ink);
}
p {
  margin: 0 0 16px;
  max-width: 70ch;
  color: var(--ink-2);
}
strong {
  font-weight: 700;
  color: var(--ink);
}
ul, ol {
  padding-left: 22px;
  margin: 0 0 16px;
  max-width: 70ch;
  color: var(--ink-2);
}
li {
  margin-bottom: 8px;
}
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 2px 6px;
}

/* 眉标 kicker */
.section-kicker, .eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-kicker::before, .eyebrow::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--magenta);
  flex-shrink: 0;
}

/* ══════════════════════════════════════════════════════════════════════════
   导航规范
   ══════════════════════════════════════════════════════════════════════════ */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav .brand {
  font-family: var(--grot);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.nav .brand small {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--ink-3);
  letter-spacing: 0.05em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav a.item {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 3px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}
.nav a.item:hover {
  color: var(--ink);
  border-bottom-color: var(--cyan);
}
.nav a.item.active, .nav a.item[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--magenta);
}

@media (max-width: 768px) {
  .nav .wrap {
    height: auto;
    padding-top: 10px;
    padding-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .nav .brand {
    width: 100%;
  }
  .nav-links {
    width: 100%;
    flex-wrap: wrap;
    gap: 6px 12px;
  }
  .nav a.item {
    font-size: 12px;
    letter-spacing: 0.05em;
    padding: 3px 0;
  }
}

@media print {
  nav.nav {
    display: none !important;
  }
}

/* ══════════════════════════════════════════════════════════════════════════
   按钮组件
   ══════════════════════════════════════════════════════════════════════════ */

.btn-v2, .btn, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  font-size: 14px;
  font-weight: 700;
  font-family: var(--mono);
  text-decoration: none;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  background: var(--surface);
  color: var(--ink);
}
.btn-v2--primary, .button--primary {
  background: var(--ink);
  color: #ffffff !important;
  border: 1px solid var(--line);
  position: relative;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.btn-v2--primary:hover, .button--primary:hover {
  background: var(--magenta);
  color: #ffffff !important;
  border-color: var(--line);
}
.btn-v2--secondary, .button--secondary {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  font-weight: 700;
}
.btn-v2--secondary:hover, .button--secondary:hover {
  background: var(--ink);
  color: #ffffff;
}

.btn-group {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}

/* ══════════════════════════════════════════════════════════════════════════
   PORTFOLIO-V2 结构与区块
   ══════════════════════════════════════════════════════════════════════════ */

body.portfolio-v2 {
  background: transparent;
  color: var(--ink);
}

.portfolio-v2 .v2-section {
  padding: 96px 0;
  border-top: 1px solid var(--line);
  background: transparent; /* 透出信号场背景 */
  position: relative;
}
.portfolio-v2 .v2-section--subtle {
  background: var(--surface);
}
@media (max-width: 768px) {
  .portfolio-v2 .v2-section {
    padding: 64px 0;
  }
}

.portfolio-v2 .section-title {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 16px;
}

/* 状态标签（mono 规范） */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
}
.status-pill::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--magenta);
  flex-shrink: 0;
}
.status-pill--commercial::before { background: var(--cyan); }
.status-pill--delivered::before { background: var(--cyan); }
.status-pill--prototype::before { background: var(--magenta); }

/* ── 首页 #top Hero 区 ─────────────────────────────────────── */
.portfolio-v2 .hero-v2 {
  padding: 80px 0 96px;
}
.portfolio-v2 .hero-grid-v2 {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 32px;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.portfolio-v2 .hero-text-v2 h1 {
  font-size: clamp(38px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--ink);
  margin: 0 0 20px;
}
.portfolio-v2 .hero-lead-v2 {
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 0 0 32px;
}
.portfolio-v2 .hero-media-v2 {
  position: relative;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}
.portfolio-v2 .hero-bleed-01 {
  position: absolute;
  right: -24px;
  font-family: var(--mono);
  font-size: clamp(140px, 20vw, 240px);
  font-weight: 700;
  color: var(--magenta);
  line-height: 0.75;
  user-select: none;
  pointer-events: none;
  opacity: 0.95;
  z-index: 1;
}

@media (max-width: 900px) {
  .portfolio-v2 .hero-grid-v2 {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .portfolio-v2 .hero-bleed-01 {
    position: static;
    font-size: 100px;
    line-height: 1;
    margin-top: 16px;
  }
}

/* ── 首页 #cases 代表项目（消灭卡片，改条目列表制） ───────── */
.portfolio-v2 .case-cards-v2 {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
  margin-top: 36px;
  background: var(--surface);
}
.portfolio-v2 .case-card-v2 {
  display: grid;
  grid-template-columns: 88px 1.4fr 2fr 48px;
  align-items: center;
  gap: 20px;
  padding: 28px 24px;
  border: none;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
  background: var(--surface);
  transition: background 0.15s ease, color 0.15s ease;
  position: relative;
}
.portfolio-v2 .case-card-v2:hover {
  background: var(--ink) !important;
  color: #ffffff !important;
}
.portfolio-v2 .case-card-num {
  font-family: var(--mono);
  font-size: 56px;
  font-weight: 700;
  line-height: 1;
}
.portfolio-v2 .case-card-v2:nth-child(1) .case-card-num { color: var(--magenta); }
.portfolio-v2 .case-card-v2:nth-child(2) .case-card-num { color: var(--cyan); }
.portfolio-v2 .case-card-v2:nth-child(3) .case-card-num { color: var(--magenta); }
.portfolio-v2 .case-card-v2:nth-child(4) .case-card-num { color: var(--cyan); }
.portfolio-v2 .case-card-v2:nth-child(5) .case-card-num { color: var(--magenta); }

.portfolio-v2 .case-card-head {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.portfolio-v2 .case-card-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  line-height: 1.3;
}
.portfolio-v2 .case-card-v2:hover .case-card-title {
  color: #ffffff;
}
.portfolio-v2 .case-card-meta-tags {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.05em;
}
.portfolio-v2 .case-card-v2:hover .case-card-meta-tags {
  color: var(--cyan);
}
.portfolio-v2 .case-card-summary {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
}
.portfolio-v2 .case-card-v2:hover .case-card-summary {
  color: #e2e8f0;
}
.portfolio-v2 .case-card-arrow {
  font-family: var(--mono);
  font-size: 24px;
  color: var(--ink);
  text-align: right;
  transition: transform 0.2s ease, color 0.2s ease;
}
.portfolio-v2 .case-card-v2:hover .case-card-arrow {
  color: var(--magenta);
  transform: translateX(6px);
}

@media (max-width: 800px) {
  .portfolio-v2 .case-card-v2 {
    grid-template-columns: 60px 1fr;
    gap: 16px;
    padding: 20px 16px;
  }
  .portfolio-v2 .case-card-num { font-size: 40px; }
  .portfolio-v2 .case-card-summary { grid-column: 1 / -1; }
  .portfolio-v2 .case-card-arrow { display: none; }
}

/* ── 首页 #commercial 商业成果与因果链 ──────────────────────── */
.portfolio-v2 .commercial-v2 {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 40px;
  margin-top: 32px;
  position: relative;
}
.portfolio-v2 .comm-grid-v2 {
  display: grid;
  grid-template-columns: 38% 62%;
  gap: 40px;
  align-items: center;
}
.portfolio-v2 .comm-stat-num {
  font-size: clamp(64px, 8vw, 88px);
  font-weight: 700;
  font-family: var(--grot);
  color: var(--magenta);
  line-height: 1;
}
.portfolio-v2 .comm-stat-unit {
  font-size: 24px;
  font-weight: 700;
  color: var(--ink);
  margin-left: 6px;
}
.portfolio-v2 .comm-stat-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-2);
  margin-top: 8px;
}
.portfolio-v2 .comm-stat-meta {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-3);
  margin-top: 4px;
}

.portfolio-v2 .causal-chain-v2 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.portfolio-v2 .causal-node-v2 {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 16px 14px;
}
.portfolio-v2 .causal-step {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--cyan-ink);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.portfolio-v2 .causal-step::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}
.portfolio-v2 .causal-title {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}
.portfolio-v2 .causal-desc {
  font-size: 12.5px;
  color: var(--ink-2);
  line-height: 1.55;
  margin: 0;
}

@media (max-width: 900px) {
  .portfolio-v2 .comm-grid-v2 { grid-template-columns: 1fr; }
  .portfolio-v2 .causal-chain-v2 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .portfolio-v2 .causal-chain-v2 { grid-template-columns: 1fr; }
}

/* ── 首页 #experience 职业时间线 ────────────────────────────── */
.portfolio-v2 .timeline-v2 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
}
.portfolio-v2 .timeline-node-v2 {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 24px 20px;
  position: relative;
  display: flex;
  flex-direction: column;
}
.portfolio-v2 .timeline-node-v2::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--line);
}
.portfolio-v2 .timeline-node-v2:nth-child(odd)::before {
  background: var(--magenta);
}
.portfolio-v2 .timeline-node-v2:nth-child(even)::before {
  background: var(--cyan);
}
.portfolio-v2 .timeline-years-v2 {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.portfolio-v2 .timeline-node-v2:last-child .timeline-years-v2 {
  color: var(--magenta);
}
.portfolio-v2 .timeline-role-v2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}
.portfolio-v2 .timeline-company-v2 {
  font-size: 13px;
  color: var(--ink-3);
  margin-bottom: 12px;
}
.portfolio-v2 .timeline-cap-v2 {
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.6;
  background: var(--paper);
  border: 1px solid var(--line-thin);
  padding: 10px 12px;
  flex: 1;
  margin: 0;
}
@media (max-width: 860px) {
  .portfolio-v2 .timeline-v2 { grid-template-columns: 1fr; }
}

/* ── 首页 #how 方法与协作闭环 ──────────────────────────────── */
.portfolio-v2 .how-sub-grid-v2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 28px;
}
.portfolio-v2 .how-sub-card-v2 {
  background: var(--surface);
  border: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease;
}
.portfolio-v2 .how-sub-card-v2:hover {
  border-color: var(--magenta);
}
.portfolio-v2 .how-sub-thumb {
  height: 130px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.portfolio-v2 .how-sub-thumb svg, .portfolio-v2 .how-sub-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.portfolio-v2 .how-sub-info {
  padding: 16px;
}
.portfolio-v2 .how-sub-info h4 {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--ink);
}
.portfolio-v2 .how-sub-info p {
  font-size: 13px;
  color: var(--ink-2);
  margin: 0;
  line-height: 1.5;
}
@media (max-width: 768px) {
  .portfolio-v2 .how-sub-grid-v2 { grid-template-columns: 1fr; }
}

/* ── 首页 #contact 联系区 ──────────────────────────────────── */
.portfolio-v2 .contact-box-v2 {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 40px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: center;
  position: relative;
}
.portfolio-v2 .contact-detail-row {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 15px;
}
.portfolio-v2 .contact-detail-label {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-3);
  width: 100px;
}
.portfolio-v2 .contact-detail-val {
  color: var(--ink);
  font-weight: 500;
}
@media (max-width: 768px) {
  .portfolio-v2 .contact-box-v2 {
    grid-template-columns: 1fr;
    padding: 24px 20px;
  }
}

/* ── 详情页排版组件 ────────────────────────────────────────── */
.portfolio-v2 .detail-hero-v2 {
  padding: 56px 0 40px;
}
.portfolio-v2 .detail-header-v2 {
  max-width: 820px;
  margin-bottom: 28px;
}
.portfolio-v2 .detail-header-v2 h1 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin: 12px 0 16px;
  color: var(--ink);
}
.portfolio-v2 .detail-header-v2 p {
  font-size: 17px;
  color: var(--ink-2);
  line-height: 1.68;
  margin: 0;
}

.visual-frame {
  background: var(--surface);
  border: 1px solid var(--line);
  overflow: hidden;
  position: relative;
}
.visual-frame svg, .visual-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.facts-table-v2 {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: var(--surface);
  border: 1px solid var(--line);
}
.facts-table-v2 th, .facts-table-v2 td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-thin);
  font-size: 14.5px;
  text-align: left;
}
.facts-table-v2 th {
  background: var(--paper);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--line);
}
.facts-table-v2 tr:last-child td {
  border-bottom: none;
}

.subpage-split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.subpage-trio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 768px) {
  .subpage-split-grid, .subpage-trio-grid {
    grid-template-columns: 1fr !important;
  }
}

/* 图注规范：FIG.01 — ...（青色 mono，编号常规字重） */
.fig-caption {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--cyan);
  margin-top: 10px;
  display: block;
  letter-spacing: 0.06em;
}

/* ══════════════════════════════════════════════════════════════════════════
   页脚规范（4px 粗黑封底杠 + 套印签名方块）
   ══════════════════════════════════════════════════════════════════════════ */

footer.site-footer, footer {
  border-top: 4px solid var(--line) !important;
  background: var(--paper);
  padding: 48px 0;
  margin-top: 64px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-2);
}
.footer-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-left {
  font-weight: 700;
  color: var(--ink);
}
.footer-right {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--ink-3);
}
.stamp-overprint {
  width: 24px;
  height: 24px;
  position: relative;
  display: inline-block;
}
.stamp-overprint::before, .stamp-overprint::after {
  content: "";
  position: absolute;
  inset: 0;
  mix-blend-mode: multiply;
}
.stamp-overprint::before {
  background: var(--magenta);
  transform: translate(-2px, -2px);
}
.stamp-overprint::after {
  background: var(--cyan);
  transform: translate(2px, 2px);
}

/* ── 首页 #workflow 五步工作法 ────────────────────────────── */
.portfolio-v2 .workflow-grid-v2 {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  margin-top: 28px;
}
.portfolio-v2 .workflow-step-v2 {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  position: relative;
}
.portfolio-v2 .workflow-step-v2::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--line);
}
.portfolio-v2 .workflow-step-v2:nth-child(odd)::before {
  background: var(--magenta);
}
.portfolio-v2 .workflow-step-v2:nth-child(even)::before {
  background: var(--cyan);
}
.portfolio-v2 .workflow-step-num {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  margin-bottom: 8px;
}
.portfolio-v2 .workflow-step-v2:nth-child(odd) .workflow-step-num { color: var(--magenta); }
.portfolio-v2 .workflow-step-v2:nth-child(even) .workflow-step-num { color: var(--cyan); }
.portfolio-v2 .workflow-step-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}
.portfolio-v2 .workflow-step-desc {
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.6;
  margin: 0 0 14px;
  flex: 1;
}
.portfolio-v2 .workflow-step-tags {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-3);
  border-top: 1px solid var(--line-thin);
  padding-top: 10px;
  line-height: 1.5;
}
@media (max-width: 1024px) {
  .portfolio-v2 .workflow-grid-v2 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .portfolio-v2 .workflow-grid-v2 {
    grid-template-columns: 1fr;
  }
}

/* ── 首页 #skills 技术能力区 ──────────────────────────────── */
.portfolio-v2 .skills-blocks-v2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 28px;
}
.portfolio-v2 .skills-block-card-v2 {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 24px 20px;
  position: relative;
  display: flex;
  flex-direction: column;
}
.portfolio-v2 .skills-block-card-v2::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--line);
}
.portfolio-v2 .skills-block-card-v2:nth-child(1)::before { background: var(--magenta); }
.portfolio-v2 .skills-block-card-v2:nth-child(2)::before { background: var(--cyan); }
.portfolio-v2 .skills-block-card-v2:nth-child(3)::before { background: var(--ink); }
.portfolio-v2 .skills-block-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.portfolio-v2 .skills-block-head h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  color: var(--ink);
}
.portfolio-v2 .skills-block-sub {
  font-size: 12.5px;
  color: var(--ink-3);
  font-family: var(--mono);
  margin-bottom: 14px;
}
.portfolio-v2 .skills-block-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}
.portfolio-v2 .skill-tag-pill {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--paper);
  border: 1px solid var(--line-thin);
  padding: 3px 8px;
  color: var(--ink);
  white-space: nowrap;
}
@media (max-width: 860px) {
  .portfolio-v2 .skills-blocks-v2 {
    grid-template-columns: 1fr;
  }
}

/* ── 首页 #commercial 新产品定义方法 ────────────────────────── */
.portfolio-v2 .product-def-method-v2 {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 24px;
  margin-top: 24px;
}
.portfolio-v2 .def-chain-v2 {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin-top: 16px;
}
.portfolio-v2 .def-chain-node-v2 {
  background: var(--surface);
  border: 1px solid var(--line-thin);
  padding: 12px 10px;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--ink);
  position: relative;
}
.portfolio-v2 .def-chain-node-v2 .def-node-num {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--magenta-ink);
  margin-bottom: 4px;
}
@media (max-width: 900px) {
  .portfolio-v2 .def-chain-v2 {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 540px) {
  .portfolio-v2 .def-chain-v2 {
    grid-template-columns: 1fr;
  }
}

/* ══════════════════════════════════════════════════════════════════════════
   旧类名兼容层（保证既有子页面排版稳固，不报错、不破绽）
   ══════════════════════════════════════════════════════════════════════════ */
.section { max-width: var(--wrap); margin: 0 auto; padding: 64px 24px; }
.section__header { margin-bottom: 28px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.tile, .panel, .case-card {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 20px 22px;
}
.step-strip {
  border: 1px solid var(--line);
  background: var(--surface);
}
.step-row {
  display: grid;
  grid-template-columns: 150px 1fr;
  border-top: 1px solid var(--line-thin);
}
.step-row:first-child { border-top: none; }
.step-row .step-label {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  padding: 14px 18px;
  border-right: 1px solid var(--line-thin);
  background: var(--paper);
}
.step-row .step-body {
  padding: 14px 18px;
  font-size: 14.5px;
}
@media (max-width: 640px) {
  .step-row { grid-template-columns: 1fr; }
  .step-row .step-label { border-right: none; border-bottom: 1px solid var(--line-thin); }
}