/* ============================================================
   子墨 · 个人主页设计系统
   深色科技感 · 编辑级排版
   适用于 index.html / fde/ / biz/（子页面通过 ../zimuo.css 引用）
   ============================================================ */

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input { font-family: inherit; }

/* ===== TOKENS ===== */
:root {
  --bg:        #0B0E13;
  --bg-2:      #0E1219;
  --bg-3:      #131824;
  --panel:     #11161F;
  --line:      rgba(255,255,255,0.08);
  --line-soft: rgba(255,255,255,0.05);
  --text:      #E8EAF0;
  --text-2:    #9AA3B2;
  --text-3:    #5C6675;
  --gold:      #C9A24B;
  --gold-lt:   #E8CE8F;
  --gold-dim:  rgba(201,162,75,0.14);
  --cyan:      #5FB8C9;
  --serif:     'Noto Serif SC', 'Songti SC', Georgia, serif;
  --sans:      'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --mono:      'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  --radius:    10px;
  --ease:      0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-h:     68px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--gold); color: #0B0E13; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.section { padding: 110px 0; position: relative; }
.section-alt { background: var(--bg-2); }

/* 背景网格纹理（科技感） */
.grid-bg { position: relative; }
.grid-bg::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 30%, transparent 75%);
  pointer-events: none;
}

/* ===== SECTION HEADER ===== */
.section-head { margin-bottom: 64px; }
.section-head.center { text-align: center; }

.sec-index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 20px;
}
.sec-index::before {
  content: '';
  width: 32px; height: 1px;
  background: var(--gold);
  opacity: 0.6;
}
.section-head.center .sec-index::after {
  content: '';
  width: 32px; height: 1px;
  background: var(--gold);
  opacity: 0.6;
}

.sec-title {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
  letter-spacing: 0.01em;
}

.sec-intro {
  font-size: 1.02rem;
  color: var(--text-2);
  max-width: 620px;
  margin-top: 18px;
  line-height: 1.9;
}
.section-head.center .sec-intro { margin-left: auto; margin-right: auto; }

/* ===== NAV ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background var(--ease), border-color var(--ease), backdrop-filter var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(11,14,19,0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: 1120px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 40px;
}
.nav-logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo:hover { opacity: 1; }
.nav-logo .logo-name {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text);
}
.nav-logo .logo-sub {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--text-3);
  text-transform: uppercase;
}
.nav-links {
  display: flex;
  gap: 30px;
  margin-left: auto;
}
.nav-links a {
  font-size: 0.88rem;
  color: var(--text-2);
  letter-spacing: 0.04em;
  position: relative;
  padding: 4px 0;
  transition: color var(--ease);
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width var(--ease);
}
.nav-links a:hover { color: var(--text); opacity: 1; }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  flex-shrink: 0;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--gold-lt);
  border: 1px solid rgba(201,162,75,0.45);
  padding: 8px 18px;
  border-radius: 100px;
  transition: background var(--ease), border-color var(--ease);
}
.nav-cta:hover { background: var(--gold-dim); border-color: var(--gold); opacity: 1; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  margin-left: auto;
}
.nav-toggle span {
  width: 22px; height: 1.5px;
  background: var(--text);
  transition: transform var(--ease), opacity var(--ease);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 60px) 0 90px;
  position: relative;
}
.hero-inner { position: relative; z-index: 1; width: 100%; }

.hero-kicker {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid rgba(95,184,201,0.3);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 36px;
}

.hero-title {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.06em;
  margin-bottom: 28px;
}

.hero-quote {
  font-family: var(--serif);
  font-size: clamp(2rem, 5.4vw, 3.9rem);
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: 0.02em;
  color: var(--text);
  min-height: 2.9em;
  margin-bottom: 36px;
}
.hero-quote .gold { color: var(--gold); }
.type-caret {
  display: inline-block;
  width: 3px;
  height: 0.92em;
  background: var(--gold);
  margin-left: 6px;
  vertical-align: -0.08em;
  animation: caret-blink 0.9s step-end infinite;
}
@keyframes caret-blink { 50% { opacity: 0; } }

.hero-desc {
  font-size: 1.06rem;
  color: var(--text-2);
  max-width: 640px;
  line-height: 2;
  margin-bottom: 48px;
}
.hero-desc strong { color: var(--text); font-weight: 600; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }

.btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #0B0E13;
  background: linear-gradient(135deg, var(--gold-lt), var(--gold));
  padding: 14px 32px;
  border-radius: 100px;
  transition: transform var(--ease), box-shadow var(--ease);
}
.btn-gold:hover {
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(201,162,75,0.28);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-2);
  border: 1px solid var(--line);
  padding: 14px 32px;
  border-radius: 100px;
  transition: color var(--ease), border-color var(--ease), transform var(--ease);
}
.btn-ghost:hover {
  opacity: 1;
  color: var(--text);
  border-color: rgba(255,255,255,0.3);
  transform: translateY(-2px);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 36px;
  margin-top: 72px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}
.hero-meta-item {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--text-3);
}
.hero-meta-item b {
  display: block;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.03em;
  margin-top: 4px;
}

.hero-scroll {
  position: absolute;
  bottom: 28px; left: 50%;
  transform: translateX(-50%);
  width: 1px; height: 56px;
  background: var(--line);
  overflow: hidden;
}
.hero-scroll::after {
  content: '';
  position: absolute;
  top: -50%; left: 0;
  width: 100%; height: 50%;
  background: var(--gold);
  animation: scroll-drop 1.8s ease-in-out infinite;
}
@keyframes scroll-drop {
  0% { top: -50%; } 100% { top: 110%; }
}

/* ===== 渐入动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.visible { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: 0.08s; }
.reveal-d2 { transition-delay: 0.16s; }
.reveal-d3 { transition-delay: 0.24s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .type-caret, .hero-scroll::after { animation: none; }
}

/* ===== 问子墨 · 聊天区 ===== */
.chat-wrap {
  max-width: 780px;
  margin: 0 auto;
}
.chat-shell {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,0.4);
}
.chat-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 22px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-3);
}
.chat-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: #0B0E13;
  background: linear-gradient(135deg, var(--gold-lt), var(--gold));
  flex-shrink: 0;
}
.chat-head-info { line-height: 1.4; }
.chat-head-name { font-size: 0.95rem; font-weight: 600; }
.chat-head-status {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
}
.chat-head-status .dot {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  margin-right: 6px;
  vertical-align: 1px;
}
.chat-badge {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--gold-lt);
  border: 1px solid rgba(201,162,75,0.4);
  padding: 4px 12px;
  border-radius: 100px;
  white-space: nowrap;
}
.chat-body {
  height: 380px;
  overflow-y: auto;
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.14) transparent;
}
.chat-body::-webkit-scrollbar { width: 5px; }
.chat-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.14); border-radius: 4px; }

.msg {
  max-width: 82%;
  padding: 12px 18px;
  border-radius: 14px;
  font-size: 0.92rem;
  line-height: 1.8;
  animation: msg-in 0.32s ease both;
  white-space: pre-line;
}
@keyframes msg-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}
.msg-bot {
  align-self: flex-start;
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-bottom-left-radius: 4px;
  color: var(--text);
}
.msg-user {
  align-self: flex-end;
  background: var(--gold-dim);
  border: 1px solid rgba(201,162,75,0.3);
  border-bottom-right-radius: 4px;
  color: var(--gold-lt);
}
.msg-typing {
  align-self: flex-start;
  display: inline-flex;
  gap: 5px;
  padding: 16px 20px;
}
.msg-typing i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text-3);
  animation: typing 1.1s ease-in-out infinite;
}
.msg-typing i:nth-child(2) { animation-delay: 0.18s; }
.msg-typing i:nth-child(3) { animation-delay: 0.36s; }
@keyframes typing { 40% { transform: translateY(-5px); opacity: 1; } }

.chat-suggest {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 22px;
  border-top: 1px solid var(--line);
}
.chat-chip {
  font-size: 0.78rem;
  color: var(--text-2);
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 6px 14px;
  border-radius: 100px;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.chat-chip:hover {
  color: var(--gold-lt);
  border-color: rgba(201,162,75,0.45);
  background: var(--gold-dim);
}
.chat-input-row {
  display: flex;
  gap: 10px;
  padding: 14px 22px 18px;
  border-top: 1px solid var(--line);
}
.chat-input {
  flex: 1;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 100px;
  color: var(--text);
  font-size: 0.9rem;
  padding: 11px 20px;
  outline: none;
  transition: border-color var(--ease);
  min-width: 0;
}
.chat-input::placeholder { color: var(--text-3); }
.chat-input:focus { border-color: rgba(201,162,75,0.5); }
.chat-send {
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--gold-lt), var(--gold));
  color: #0B0E13;
  border: none;
  border-radius: 100px;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 11px 24px;
  transition: transform var(--ease), box-shadow var(--ease);
}
.chat-send:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(201,162,75,0.25); }
.chat-note {
  text-align: center;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-top: 18px;
}

/* ===== 业务入口卡 ===== */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.biz-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 30px 30px;
  overflow: hidden;
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}
.biz-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent 70%);
  opacity: 0;
  transition: opacity var(--ease);
}
.biz-card:hover {
  opacity: 1;
  transform: translateY(-6px);
  border-color: rgba(201,162,75,0.35);
  box-shadow: 0 20px 48px rgba(0,0,0,0.4);
}
.biz-card:hover::before { opacity: 1; }
.biz-num {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--text-3);
  margin-bottom: 22px;
}
.biz-icon {
  font-size: 1.7rem;
  margin-bottom: 18px;
  line-height: 1;
}
.biz-card h3 {
  font-family: var(--serif);
  font-size: 1.32rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.biz-card > p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.85;
  margin-bottom: 24px;
  flex: 1;
}
.biz-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.biz-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.86rem;
  color: var(--text-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 16px;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.biz-link .arrow { color: var(--gold); transition: transform var(--ease); }
.biz-link:hover {
  opacity: 1;
  color: var(--gold-lt);
  border-color: rgba(201,162,75,0.4);
  background: var(--gold-dim);
}
.biz-link:hover .arrow { transform: translateX(4px); }
.biz-link.primary {
  color: var(--gold-lt);
  border-color: rgba(201,162,75,0.4);
}

/* ===== 言论 / Blog 预告 ===== */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.post-card {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: transform var(--ease), border-color var(--ease);
}
.post-card:hover {
  opacity: 1;
  transform: translateY(-5px);
  border-color: rgba(255,255,255,0.2);
}
.post-date {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--text-3);
  margin-bottom: 16px;
}
.post-card h3 {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.6;
  margin-bottom: 12px;
}
.post-card p {
  font-size: 0.87rem;
  color: var(--text-2);
  line-height: 1.85;
  flex: 1;
}
.post-tag {
  margin-top: 20px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}
.blog-note {
  margin-top: 36px;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--text-3);
}
.blog-note b { color: var(--gold-lt); font-weight: 500; }

/* ===== 方法论 ===== */
.method-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.method-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
  min-height: 220px;
  overflow: hidden;
  transition: border-color var(--ease), transform var(--ease), background var(--ease);
}
.method-card:hover {
  border-color: rgba(201,162,75,0.45);
  transform: translateY(-4px);
  background: var(--bg-3);
}
.method-idx {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 16px;
}
.method-card h3 {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.method-en {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
}
.method-detail {
  margin-top: 14px;
  font-size: 0.82rem;
  color: var(--text-2);
  line-height: 1.8;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.45s ease, opacity 0.4s ease, margin-top 0.4s ease;
}
.method-card:hover .method-detail,
.method-card.active .method-detail {
  max-height: 200px;
  opacity: 1;
}
.method-hint {
  position: absolute;
  bottom: 18px; left: 22px;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: var(--text-3);
  transition: opacity var(--ease);
}
.method-card:hover .method-hint { opacity: 0; }

/* ===== 代表项目 ===== */
.proj-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.proj-card {
  display: flex;
  gap: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
  transition: border-color var(--ease), transform var(--ease);
}
.proj-card:hover { border-color: rgba(95,184,201,0.35); transform: translateY(-4px); }
.proj-idx {
  font-family: var(--mono);
  font-size: 1.5rem;
  color: var(--text-3);
  line-height: 1.2;
  flex-shrink: 0;
}
.proj-card h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.proj-card p {
  font-size: 0.88rem;
  color: var(--text-2);
  line-height: 1.8;
}
.proj-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.proj-tags span {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
  border: 1px solid var(--line);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ===== 合作方式 ===== */
.coop-table {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 48px;
}
.coop-row {
  display: grid;
  grid-template-columns: 260px 1fr;
  border-bottom: 1px solid var(--line);
  transition: background var(--ease);
}
.coop-row:last-child { border-bottom: none; }
.coop-row:hover { background: rgba(255,255,255,0.02); }
.coop-row.head {
  background: var(--bg-3);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.coop-row.head:hover { background: var(--bg-3); }
.coop-cell { padding: 20px 26px; font-size: 0.92rem; }
.coop-cell:first-child {
  font-weight: 600;
  border-right: 1px solid var(--line);
}
.coop-row.head .coop-cell { font-weight: 400; padding: 14px 26px; }
.coop-cell:last-child { color: var(--text-2); }
.coop-row.head .coop-cell:last-child { color: var(--gold); }

.cta-panel {
  text-align: center;
  background: var(--bg-3);
  border: 1px solid rgba(201,162,75,0.25);
  border-radius: 16px;
  padding: 56px 32px;
  position: relative;
  overflow: hidden;
}
.cta-panel::before {
  content: '';
  position: absolute;
  top: -60%; left: 50%;
  transform: translateX(-50%);
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(201,162,75,0.12), transparent 65%);
  pointer-events: none;
}
.cta-panel h3 {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 14px;
  position: relative;
}
.cta-panel p {
  color: var(--text-2);
  font-size: 0.98rem;
  margin-bottom: 30px;
  position: relative;
}
.cta-contact {
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}
.cta-wechat {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--gold-lt);
  letter-spacing: 0.04em;
}
.cta-wechat-sub {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--line);
  padding: 44px 0 36px;
  background: var(--bg-2);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 32px;
}
.footer-brand {
  font-family: var(--serif);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-2);
}
.footer-copy {
  font-size: 0.78rem;
  color: var(--text-3);
}
.footer-ver {
  margin-left: auto;
  display: flex;
  gap: 18px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

/* ===== 子页面（fde / biz）通用 ===== */
.sub-hero {
  padding: calc(var(--nav-h) + 90px) 0 80px;
}
.sub-hero .hero-quote { min-height: 0; font-size: clamp(1.9rem, 4.6vw, 3.2rem); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.feature-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: border-color var(--ease), transform var(--ease);
}
.feature-card:hover { border-color: rgba(201,162,75,0.35); transform: translateY(-4px); }
.feature-card .f-idx {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--gold);
  margin-bottom: 18px;
}
.feature-card h3 {
  font-family: var(--serif);
  font-size: 1.14rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.feature-card p, .feature-card li {
  font-size: 0.88rem;
  color: var(--text-2);
  line-height: 1.85;
}
.feature-card ul { padding-left: 1.1em; }
.feature-card li { list-style: disc; margin-top: 4px; }
.feature-card li::marker { color: var(--gold); }

.flow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  counter-reset: step;
}
.flow-step {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
  background: var(--panel);
}
.flow-step::before {
  counter-increment: step;
  content: '0' counter(step);
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 14px;
}
.flow-step h3 {
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.flow-step p {
  font-size: 0.82rem;
  color: var(--text-2);
  line-height: 1.75;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 960px) {
  .section { padding: 80px 0; }
  .biz-grid, .post-grid, .feature-grid { grid-template-columns: 1fr; }
  .method-grid { grid-template-columns: repeat(2, 1fr); }
  .proj-grid { grid-template-columns: 1fr; }
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
  .method-card { min-height: 0; }
  .method-detail { max-height: none; opacity: 1; }
  .method-hint { display: none; }
}

@media (max-width: 720px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.mobile-open {
    display: flex;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(11,14,19,0.97);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    padding: 8px 0;
  }
  .nav-links.mobile-open a {
    padding: 14px 24px;
    font-size: 0.95rem;
  }
  .hero { min-height: 0; padding-bottom: 100px; }
  .hero-quote { min-height: 3.6em; }
  .hero-actions .btn-gold, .hero-actions .btn-ghost { width: 100%; justify-content: center; }
  .coop-row { grid-template-columns: 1fr; }
  .coop-cell:first-child { border-right: none; border-bottom: 1px solid var(--line-soft); padding-bottom: 10px; }
  .coop-cell:last-child { padding-top: 10px; }
  .coop-row.head { display: none; }
  .msg { max-width: 92%; }
  .chat-body { height: 330px; }
  .proj-card { flex-direction: column; gap: 12px; }
  .footer-ver { margin-left: 0; width: 100%; }
  .cta-panel { padding: 44px 22px; }
}