/* ============================================================
   刘雨琦 / Shian — 个人作品集
   极简白底框架 + 蓝紫渐变强调 (#6366F1 → #A855F7)
   ============================================================ */

:root {
  --bg: #FFFFFF;
  --bg-soft: #FAFAFA;
  --text: #1A1A1A;
  --text-sub: #666666;
  --accent-from: #6366F1;
  --accent-to: #A855F7;
  --border: #ECECEC;
  --font-sans: "Inter", "Noto Sans SC", -apple-system, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --maxw: 1080px;
  --radius: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a {
  color: var(--text);
  text-decoration: none;
  transition: color .2s ease;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 渐变强调工具 ---------- */
.grad-text {
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 顶部导航 ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .02em;
}

.nav-logo span {
  color: var(--text-sub);
  font-weight: 400;
  margin-left: 6px;
  font-size: 14px;
}

.nav-links { display: flex; gap: 32px; }

.nav-links a {
  font-size: 15px;
  color: var(--text-sub);
  padding: 4px 0;
  position: relative;
}

.nav-links a:hover { color: var(--text); }

.nav-links a.active {
  color: var(--text);
  font-weight: 600;
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
}

/* ---------- 通用区块 ---------- */
.section { padding-top: 96px; padding-bottom: 96px; }

.section + .section { padding-top: 0; }

.section-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: .01em;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--text-sub);
  max-width: 560px;
  margin-bottom: 56px;
}

/* ---------- 首页 Hero ---------- */
.hero {
  padding-top: 128px;
  padding-bottom: 96px;
  text-align: center;
}

.hero-name {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: .01em;
}

.hero-name .slash {
  color: var(--text-sub);
  font-weight: 300;
  margin: 0 10px;
}

.hero-role {
  margin-top: 18px;
  font-size: 17px;
  color: var(--text-sub);
  letter-spacing: .14em;
}

.hero-role i {
  font-style: normal;
  margin: 0 10px;
  background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-oneline {
  margin: 40px auto 0;
  max-width: 520px;
  font-size: 19px;
  line-height: 2;
  color: var(--text);
}

/* ---------- 项目卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

@media (max-width: 900px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .card-grid { grid-template-columns: 1fr; }
}

/* ---------- 卡片（首页精选 / 项目列表共用） ---------- */
.feature-card {
  display: block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: 0 12px 40px rgba(99, 102, 241, .14),
              0 2px 8px rgba(0, 0, 0, .05);
}

.feature-card .card-visual {
  aspect-ratio: 16 / 10;
  background: var(--bg-soft);
  overflow: hidden;
}

.feature-card .card-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 列表卡片主视觉：hover/聚焦微放大 */
.feature-card .card-visual img,
.feature-card .card-visual .viz {
  transition: transform .3s ease;
}

.feature-card:hover .card-visual img,
.feature-card:hover .card-visual .viz,
.feature-card:focus-visible .card-visual img,
.feature-card:focus-visible .card-visual .viz {
  transform: scale(1.02);
}

.feature-card .card-body { padding: 20px 22px 24px; }

.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

.list-card .card-type { margin-bottom: 10px; }

/* ---------- 查看全部入口 ---------- */
.more-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 64px;
  font-size: 16px;
  font-weight: 600;
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.more-link .arrow { transition: transform .2s ease; }

.more-link:hover .arrow { transform: translateX(6px); }

.center { text-align: center; }

/* ---------- 详情页：杂志双栏 ---------- */
.detail-col {
  max-width: 900px;
  margin: 0 auto;
}

.detail-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 64px;
}

.card-type {
  display: inline-block;
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  padding: 3px 10px;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  margin-bottom: 12px;
}

.detail-cols .desc {
  font-size: 15px;
  color: #444;
  line-height: 1.85;
}

.detail-cols .desc + .desc { margin-top: 10px; }

.card-note {
  margin-top: 14px;
  font-size: 12.5px;
  color: var(--text-sub);
  border-left: 3px solid;
  border-image: linear-gradient(var(--accent-from), var(--accent-to)) 1;
  padding-left: 10px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
  background: var(--bg-soft);
}

.detail-links {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
}

.detail-links .card-note { margin-top: 0; }

.card-links { display: flex; gap: 16px; }

.card-links a {
  font-size: 13.5px;
  font-weight: 600;
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.card-links a:hover { text-decoration: underline; }

.card-links a:focus-visible {
  outline: 2px solid var(--accent-from);
  outline-offset: 2px;
}

/* ============================================================
   概念主视觉：全出血动画组件
   容器用 container-type: size，字号/间距随容器宽度缩放
   ============================================================ */

.viz {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* ---------- NL2SQL：浅色对话流动画 ---------- */
.nlf {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  container-type: size;
  background:
    radial-gradient(circle at 15% 10%, rgba(99, 102, 241, .14), transparent 55%),
    radial-gradient(circle at 88% 95%, rgba(168, 85, 247, .14), transparent 55%),
    linear-gradient(160deg, #FAFAFF, #F3F2FC);
}

.nlf-main {
  flex: 1;
  display: flex;
  align-items: stretch;
  gap: 1.5cqw;
  padding: 4cqw 3.5cqw 2cqw;
  min-height: 0;
  transition: opacity .25s ease;
}

.nlf-pane {
  flex: 1;
  min-width: 0;
  background: rgba(255, 255, 255, .82);
  border: 1px solid rgba(99, 102, 241, .18);
  border-radius: 1.2cqw;
  padding: 1.8cqw;
  display: flex;
  flex-direction: column;
  gap: 1.2cqw;
  box-shadow: 0 4px 18px rgba(99, 102, 241, .07);
}

.nlf-pane--wide { flex: 1.25; }

.nlf-label {
  font-size: clamp(8px, 1.9cqw, 12px);
  font-weight: 700;
  letter-spacing: .14em;
  background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nlf-bubble {
  flex: 1;
  display: flex;
  align-items: center;
  font-size: clamp(9px, 2.3cqw, 15px);
  line-height: 1.6;
  background: linear-gradient(120deg, rgba(99,102,241,.1), rgba(168,85,247,.1));
  border-radius: 1cqw 1cqw 1cqw 2px;
  padding: 1.2cqw 1.4cqw;
}

.nlf-caret {
  display: inline-block;
  width: .55em;
  height: 1.05em;
  margin-left: 2px;
  vertical-align: -2px;
  background: linear-gradient(180deg, var(--accent-from), var(--accent-to));
  animation: caretBlink 1s steps(1) infinite;
}

@keyframes caretBlink { 50% { opacity: 0; } }

.nlf-code {
  flex: 1;
  font-family: var(--font-mono);
  font-size: clamp(8px, 2cqw, 13.5px);
  line-height: 1.8;
  color: #4338CA;
  background: #F4F4FE;
  border-radius: .8cqw;
  padding: 1.2cqw 1.4cqw;
  white-space: pre-wrap;
  word-break: break-word;
  overflow: hidden;
}

.nlf-code .kw {
  font-weight: 700;
  background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nlf-code .cm { color: #9A9AB8; }

.nlf-arrow {
  align-self: center;
  flex-shrink: 0;
  font-size: clamp(10px, 2.6cqw, 20px);
  font-weight: 700;
  color: #C9C9E0;
  transition: color .3s ease;
}

.nlf-arrow.on {
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: nlfPulse 1.1s ease-in-out infinite;
}

@keyframes nlfPulse { 50% { opacity: .45; } }

.nlf-chart {
  flex: 1;
  display: flex;
  align-items: flex-end;
  gap: 1cqw;
  min-height: 0;
  padding-top: 1cqw;
}

.nlf-chart--bars i {
  flex: 1;
  height: 0;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(180deg, var(--accent-to), var(--accent-from));
  opacity: .88;
  transition: height .5s cubic-bezier(.2, .65, .25, 1);
}

.nlf-chart--h {
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  gap: .8cqw;
}

.nlf-chart--h i {
  flex: 1;
  width: 0;
  max-height: 3.2cqw;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
  opacity: .88;
  transition: width .5s cubic-bezier(.2, .65, .25, 1);
}

.nlf-chart--line { padding-top: .6cqw; }

.nlf-chart--line svg { width: 100%; height: 100%; }

.nlf-chart--line polyline {
  fill: none;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
  transition: opacity .55s ease;
}

.nlf-cap {
  font-size: clamp(7px, 1.7cqw, 11px);
  color: var(--text-sub);
}

.nlf-status {
  display: flex;
  align-items: center;
  gap: 1cqw;
  padding: 0 3.5cqw 2.5cqw;
  font-family: var(--font-mono);
  font-size: clamp(8px, 1.9cqw, 12px);
  color: var(--text-sub);
}

.nlf-dot {
  width: .8em;
  height: .8em;
  border-radius: 50%;
  background: #C9C9E0;
  flex-shrink: 0;
}

.nlf-dot.working {
  background: var(--accent-from);
  animation: nlfPulse 1s ease-in-out infinite;
}

.nlf-dot.done { background: #10B981; }

/* ---------- 排课引擎：经典俄罗斯方块 求解动画 ---------- */
.solv {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  container-type: size;
  background:
    repeating-linear-gradient(0deg, rgba(126, 140, 220, .05) 0 1px, transparent 1px calc(100% / 6)),
    repeating-linear-gradient(90deg, rgba(126, 140, 220, .05) 0 1px, transparent 1px calc(100% / 8)),
    radial-gradient(circle at 50% 40%, rgba(40, 48, 110, .35), transparent 75%),
    #0A0A1E;
}

.solv-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(6, 1fr);
  gap: .6cqw;
  padding: 3.5cqw 3.5cqw 1.5cqw;
  min-height: 0;
}

/* 全部满足：经典的两下闪烁 */
.solv-grid.is-done { animation: svDone .7s steps(2, end) 2; }
@keyframes svDone { 50% { filter: brightness(1.9); } }

/* tetromino 锁定块：中心色 + 左上高光边 + 右下阴影边 */
.sv-cell {
  border-radius: .3cqw;
  opacity: .82;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(8px, 2.2cqw, 14px);
  font-style: normal;
  color: #fff;
  text-shadow: 1px 1px 0 rgba(0, 0, 0, .5);
  box-shadow:
    inset .5cqw .5cqw 0 rgba(255, 255, 255, .45),
    inset -.5cqw -.5cqw 0 rgba(0, 0, 0, .45);
  transition: opacity .5s ease, transform .5s ease, filter .5s ease;
}

.sv-req  { background: linear-gradient(135deg, rgba(255, 255, 255, .28), rgba(255, 255, 255, 0) 45%), #00F0F0; }
.sv-elec { background: linear-gradient(135deg, rgba(255, 255, 255, .28), rgba(255, 255, 255, 0) 45%), #A000F0; }
.sv-act  { background: linear-gradient(135deg, rgba(255, 255, 255, .28), rgba(255, 255, 255, 0) 45%), #F0A000; }

/* 冲突 = 红色 Z 块 + 闪烁抖动 */
.sv-cell.is-conf {
  opacity: 1;
  background: linear-gradient(135deg, rgba(255, 255, 255, .28), rgba(255, 255, 255, 0) 45%), #F00000;
  animation: svBlink .8s ease-in-out infinite;
}

@keyframes svBlink { 50% { opacity: .5; transform: translate(.12cqw, -.1cqw); } }

/* 消解后 = 正常锁定块（纯色实块，微微提亮） */
.sv-cell.resolved {
  opacity: 1;
  transform: scale(1.02);
  filter: brightness(1.12);
}

.solv-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2cqw;
  padding: 0 3.5cqw 2.5cqw;
  font-family: var(--font-mono);
  font-size: clamp(7px, 1.8cqw, 11.5px);
  color: rgba(201, 209, 224, .6);
}

.solv-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6cqw;
}

.solv-legend span { display: inline-flex; align-items: center; gap: .5em; }

.solv-legend .dot {
  width: .9em;
  height: .9em;
  border-radius: 2px;
  display: inline-block;
  box-shadow:
    inset 1px 1px 0 rgba(255, 255, 255, .45),
    inset -1px -1px 0 rgba(0, 0, 0, .45);
}

.solv-legend .lg-conf { color: #FF6B6B; }
.solv-legend .lg-ok { color: #7DF97D; }

.solv-st { color: #8FD8FF; white-space: nowrap; }

/* ---------- 龙虾迷你终端（列表卡片装饰） ---------- */
.px-lob { display: block; position: relative; }

.px-lob i { position: absolute; left: 0; top: 0; }

.lmini {
  width: 100%;
  height: 100%;
  background: #050505;
  display: flex;
  flex-direction: column;
  font-family: var(--font-mono);
}

.lmini-bar {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 10px;
  background: #101010;
  flex-shrink: 0;
}

.lmini-bar i { width: 8px; height: 8px; border-radius: 50%; }

.lmini-bar i:nth-child(1) { background: #5a2d2b; }
.lmini-bar i:nth-child(2) { background: #5a4a1f; }
.lmini-bar i:nth-child(3) { background: #1f4a2a; }

.lmini-bar em {
  margin-left: 6px;
  font-style: normal;
  font-size: 9px;
  color: #4A4A4A;
}

.lmini-body {
  position: relative;
  flex: 1;
  overflow: hidden;
  padding: 8px 10px;
}

.lmini-log {
  font-size: 9.5px;
  line-height: 2.1;
  color: #8A6A20;
  animation: lmScroll 14s linear infinite;
}

@keyframes lmScroll { to { transform: translateY(-50%); } }

.lmini-log .lm-d { color: #4A3F22; }

.lmini-log .lm-g { color: #00FF00; }

.lmini-lob {
  position: absolute;
  left: 6%;
  bottom: 16%;
  opacity: .9;
  animation: lobSwim 18s ease-in-out infinite alternate;
}

@keyframes lobSwim {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(36px, -10px); }
  50%  { transform: translate(84px, 3px); }
  75%  { transform: translate(124px, -8px); }
  100% { transform: translate(160px, 2px); }
}

.lmini-prompt {
  position: absolute;
  left: 10px;
  bottom: 7px;
  font-size: 10px;
  color: #FFB000;
}

.lmini-prompt i {
  display: inline-block;
  width: .6em;
  height: 1em;
  vertical-align: -2px;
  background: #FFB000;
  animation: caretBlink 1s steps(1) infinite;
}

/* ============================================================
   详情页
   ============================================================ */

.detail-head { margin-bottom: 40px; }

.back-link {
  display: inline-block;
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 28px;
}

.back-link:hover {
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.detail-title {
  font-size: clamp(28px, 4.5vw, 40px);
  font-weight: 700;
  letter-spacing: .01em;
  margin-bottom: 10px;
}

.detail-sub {
  color: var(--text-sub);
  font-size: 15px;
}

.detail-hero {
  aspect-ratio: 16 / 9;
  max-height: 600px;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 56px;
  border: 1px solid var(--border);
}

.detail-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 详情页底部展示区 ---------- */
.showcase { margin-top: 72px; }

.showcase-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.showcase-desc {
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 20px;
}

.manual-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.manual-strip figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.manual-strip img {
  width: 100%;
  display: block;
}

.manual-strip figcaption {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: .35em;
  color: rgba(23, 43, 99, .3);
  text-shadow: 0 0 8px rgba(255, 255, 255, .55), 0 0 2px rgba(255, 255, 255, .7);
  transform: rotate(-24deg);
  user-select: none;
}

/* ---------- 名可名：互动课程样例 ---------- */
.course-demo {
  margin-top: 72px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px 40px;
}

.course-demo-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.course-demo-head .showcase-title { margin-bottom: 0; }

.mkm-progress {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-sub);
}

.mkm-tip {
  font-size: 12.5px;
  color: var(--text-sub);
  margin-bottom: 28px;
}

.mkm-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 44px;
  align-items: start;
}

.mkm-stage {
  position: sticky;
  top: 96px;
}

.mkm-stage-frame {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background:
    radial-gradient(circle at 30% 25%, rgba(99, 102, 241, .1), transparent 60%),
    radial-gradient(circle at 75% 80%, rgba(168, 85, 247, .1), transparent 60%),
    var(--bg-soft);
}

.mkm-stage img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity .6s ease;
}

.mkm-stage img.on { opacity: 1; }

.mkm-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 24px;
}

.mkm-dots i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--border);
  transition: background .3s ease, transform .3s ease;
}

.mkm-dots i.on {
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  transform: scale(1.15);
}

.mkm-flow {
  position: relative;
  height: 340px;
  overflow: hidden;
}

.mkm-item {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  display: flex;
  align-items: center;
  transition: transform .35s cubic-bezier(.2, .65, .25, 1), opacity .35s ease;
}

.mkm-item > * { width: 100%; }

.mkm-enter-below { transform: translateY(36px); opacity: 0; }
.mkm-enter-above { transform: translateY(-36px); opacity: 0; }
.mkm-exit-up     { transform: translateY(-36px); opacity: 0; }
.mkm-exit-down   { transform: translateY(36px); opacity: 0; }

.mkm-pager {
  display: flex;
  gap: 12px;
  margin-top: 18px;
}

.mkm-prev {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-sub);
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease, opacity .2s ease;
}

.mkm-prev:hover:not(:disabled) {
  color: var(--text);
  border-color: #CCC;
}

.mkm-prev:disabled {
  opacity: .35;
  cursor: default;
}

.mkm-next {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 34px;
  border-radius: 999px;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--bg), var(--bg)) padding-box,
    linear-gradient(120deg, var(--accent-from), var(--accent-to)) border-box;
  cursor: pointer;
  animation: mkmPulse 1.8s ease-in-out infinite;
  transition: opacity .2s ease;
}

.mkm-next:hover:not(:disabled) {
  background:
    linear-gradient(var(--bg-soft), var(--bg-soft)) padding-box,
    linear-gradient(120deg, var(--accent-from), var(--accent-to)) border-box;
}

.mkm-next:disabled {
  opacity: .35;
  cursor: default;
  animation: none;
}

@keyframes mkmPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, .3); }
  50%      { box-shadow: 0 0 0 9px rgba(99, 102, 241, 0); }
}

.mkm-sent {
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  transition: background .2s ease;
}

.mkm-sent:hover, .mkm-sent.show-zh { background: var(--bg-soft); }

.mkm-en {
  font-weight: 700;
  font-size: 16px;
  line-height: 1.65;
}

.mkm-zh {
  display: none;
  margin-top: 4px;
  font-size: 13.5px;
  font-weight: 400;
  color: var(--text-sub);
}

.mkm-sent:hover .mkm-zh,
.mkm-sent.show-zh .mkm-zh { display: block; }

.mkm-quiz {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  background: var(--bg-soft);
}

.mkm-quiz-tag {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .06em;
  padding: 2px 10px;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  margin-bottom: 10px;
}

.mkm-q { font-size: 15px; font-weight: 600; }

.mkm-opts {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.mkm-opt {
  text-align: left;
  font-family: var(--font-sans);
  font-size: 14.5px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
  transition: border-color .2s ease, background .2s ease;
}

.mkm-opt:hover:not(:disabled) { border-color: var(--accent-from); }

.mkm-opt:disabled { cursor: default; }

.mkm-opt.correct {
  border-color: #10B981;
  background: #ECFDF5;
  color: #047857;
  font-weight: 600;
}

.mkm-opt.wrong {
  border-color: #F43F5E;
  background: #FFF1F2;
  color: #BE123C;
}

.mkm-done {
  display: none;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 15px;
  font-weight: 600;
}

.mkm-done.show { display: block; }

.mkm-done b {
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ============================================================
   龙虾终端 Demo（projects/lobster.html）
   ============================================================ */

.demo {
  margin-bottom: 56px;
}

.demo-term {
  background: #000000;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .3);
  font-family: var(--font-mono);
  cursor: text;
}

.demo-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  background: #0D0D0D;
  padding: 10px 14px;
}

.demo-bar i { width: 11px; height: 11px; border-radius: 50%; }

.demo-bar i:nth-child(1) { background: #FF5F57; }
.demo-bar i:nth-child(2) { background: #FEBC2E; }
.demo-bar i:nth-child(3) { background: #28C840; }

.demo-bar em {
  margin-left: 10px;
  font-style: normal;
  font-size: 11px;
  color: #4A4A4A;
}

.demo-body {
  position: relative;
  padding: 18px 20px 22px;
}

.demo-out {
  position: relative;
  z-index: 2;
  height: 360px;
  overflow-y: auto;
  font-size: 14px;
  line-height: 1.9;
  color: #FFB000;
  white-space: pre-wrap;
  word-break: break-word;
  scrollbar-width: thin;
  scrollbar-color: #333 #000;
}

.demo-out .ld-dim { color: #666666; }

.demo-out .ld-green { color: #00FF00; }

.demo-out .ld-ev { color: #CC8D00; }

.demo-out .ld-narr { color: #FFB000; }

.ld-cursor {
  display: inline-block;
  width: .62em;
  height: 1.05em;
  vertical-align: -2px;
  background: #FFB000;
  animation: caretBlink 1s steps(1) infinite;
}

/* 装饰层：像素龙虾 + 水草 + 气泡 */
.demo-deco {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .55;
}

.demo-lob {
  position: absolute;
  left: 4%;
  bottom: 18%;
  animation: lobSwimBig 26s ease-in-out infinite alternate;
}

@keyframes lobSwimBig {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(60px, -18px); }
  50%  { transform: translate(150px, 6px); }
  75%  { transform: translate(230px, -12px); }
  100% { transform: translate(300px, 4px); }
}

.demo-grass {
  position: absolute;
  right: 6%;
  bottom: 0;
  display: flex;
  align-items: flex-end;
  gap: 9px;
}

.demo-grass i {
  width: 4px;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(180deg, #0d5c2e, #052e16);
  transform-origin: bottom center;
  animation: grassSway 3.6s ease-in-out infinite alternate;
}

.demo-grass i:nth-child(1) { height: 46px; animation-delay: 0s; }
.demo-grass i:nth-child(2) { height: 64px; animation-delay: .5s; }
.demo-grass i:nth-child(3) { height: 38px; animation-delay: 1s; }
.demo-grass i:nth-child(4) { height: 56px; animation-delay: 1.5s; }

@keyframes grassSway {
  from { transform: rotate(-5deg); }
  to   { transform: rotate(5deg); }
}

.demo-bubbles i {
  position: absolute;
  bottom: 6%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 176, 0, .35);
  animation: bubbleRise 7s ease-in infinite;
}

.demo-bubbles i:nth-child(1) { left: 22%; animation-delay: 0s; }
.demo-bubbles i:nth-child(2) { left: 48%; animation-delay: 2.6s; }
.demo-bubbles i:nth-child(3) { left: 74%; animation-delay: 4.8s; }

@keyframes bubbleRise {
  0%   { transform: translateY(0); opacity: 0; }
  12%  { opacity: .8; }
  85%  { opacity: .5; }
  100% { transform: translateY(-260px); opacity: 0; }
}

/* 行动按钮 */
.demo-actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.demo-actions button {
  font-family: var(--font-mono);
  font-size: 14px;
  background: #000;
  color: #FFB000;
  border: 1px solid #3D2E08;
  border-radius: 8px;
  padding: 12px 18px;
  cursor: pointer;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.demo-actions button b { font-weight: 700; }

.demo-actions button span { color: #666; font-size: 12px; }

.demo-actions button:hover:not(:disabled) {
  border-color: #FFB000;
  box-shadow: 0 0 14px rgba(255, 176, 0, .25);
}

.demo-actions button:disabled {
  opacity: .35;
  cursor: default;
}

.demo-actions.pulse button:not(:disabled) {
  animation: btnPulse .5s ease;
}

@keyframes btnPulse { 50% { border-color: #FFB000; } }

.demo-hint {
  margin-top: 14px;
  font-size: 12.5px;
  color: var(--text-sub);
  font-family: var(--font-mono);
}

/* ---------- 关于页 ---------- */
.about-quote {
  max-width: 640px;
}

.about-quote p {
  font-size: 18px;
  line-height: 2.1;
  margin-bottom: 32px;
  padding-left: 20px;
  border-left: 3px solid var(--border);
  color: #333;
}

.about-quote p:first-child {
  border-image: linear-gradient(var(--accent-from), var(--accent-to)) 1;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 640px;
  margin-top: 56px;
}

.tag-cloud .tag {
  font-family: var(--font-sans);
  font-size: 13.5px;
  padding: 6px 16px;
  color: var(--text);
  cursor: default;
  transition: all .2s ease;
}

.tag-cloud .tag:hover {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
}

.now-line {
  margin-top: 56px;
  max-width: 640px;
  font-size: 16px;
  color: var(--text-sub);
}

.now-line strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- 联系页 ---------- */
.contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px 36px;
  font-size: 17px;
}

.contact-line .lbl {
  font-size: 13px;
  color: var(--text-sub);
  letter-spacing: .08em;
  margin-right: 6px;
}

.contact-line a {
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: all .2s ease;
}

.contact-line a:hover {
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  border-bottom-color: var(--accent-to);
}

/* ---------- 页脚 ---------- */
.site-foot {
  border-top: 1px solid var(--border);
  padding: 40px 0 48px;
  margin-top: 96px;
}

.site-foot .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.foot-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  font-size: 14px;
  color: var(--text-sub);
}

.foot-contact a { color: var(--text-sub); }

.foot-contact a:hover {
  background: linear-gradient(120deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.foot-copy {
  font-size: 12.5px;
  color: #999;
}

/* ---------- 页面动效（克制型） ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: 1; transform: none; }
}

.fade-up {
  animation: fadeUp .7s cubic-bezier(.2, .65, .25, 1) both;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.2, .65, .25, 1);
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* ---------- 移动端微调 ---------- */
@media (max-width: 600px) {
  .wrap { padding: 0 32px; }
  .section { padding-top: 72px; padding-bottom: 72px; }
  .hero { padding-top: 88px; padding-bottom: 72px; }
  .hero-role {
    font-size: 14px;
    letter-spacing: .04em;
  }
  .hero-role i { margin: 0 6px; }
  .nav-links { gap: 18px; }
  .nav-links a { font-size: 14px; }
  .nav-logo { font-size: 15px; }
  .nav-logo span { font-size: 12px; margin-left: 4px; }
  .detail-hero { margin-bottom: 40px; }
  .detail-cols { grid-template-columns: 1fr; gap: 8px; }
  .detail-cols > div + div { margin-top: 24px; }
  .manual-strip { gap: 12px; }
  .course-demo { padding: 24px 20px 28px; }
  .mkm-layout { grid-template-columns: 1fr; gap: 24px; }
  .mkm-stage { position: static; }
  .mkm-stage-frame { aspect-ratio: 16 / 10; }
  .mkm-flow { height: 400px; }
  .mkm-pager { flex-wrap: wrap; }
  .mkm-prev, .mkm-next { flex: 1 1 40%; min-height: 48px; }

  /* 龙虾 demo 移动端：终端缩小，按钮变大 */
  .demo-out { height: 300px; font-size: 12.5px; }
  .demo-body { padding: 14px 14px 16px; }
  .demo-actions button {
    flex: 1 1 42%;
    min-height: 48px;
    font-size: 15px;
  }
  .demo-lob { transform: scale(.7); transform-origin: bottom left; }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .feature-card, .more-link .arrow,
  .feature-card .card-visual img,
  .feature-card .card-visual .viz { transition: none; }
  .feature-card:hover .card-visual img,
  .feature-card:hover .card-visual .viz,
  .feature-card:focus-visible .card-visual img,
  .feature-card:focus-visible .card-visual .viz { transform: none; }
  .fade-up { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .nlf-caret, .nlf-arrow.on, .nlf-dot.working,
  .sv-cell.is-conf, .lmini-log, .lmini-lob, .lmini-prompt i,
  .demo-lob, .demo-grass i, .demo-bubbles i,
  .ld-cursor, .demo-actions.pulse button,
  .mkm-next { animation: none; }
  .mkm-item, .mkm-stage img, .mkm-dots i { transition: none; }
  .solv-grid.is-done { animation: none; }
}