/* ============================================================
   唐清乐 · 个人总作品集（K3 参考图驱动方向：人物主体 + 编辑排版）
   单文件、无框架、移动优先。断点只递进：640 / 1024 / 1280 / 1440。
   规格：docs/superpowers/specs/2026-08-12-k3-reference-driven-redesign.md
   ============================================================ */

/* tokens */
:root {
  color-scheme: light;
  --paper: #f8f8f6;
  --ink: #141414;
  --muted: #5c5a54;
  --on-dark: #f8f8f6;
  --on-dark-muted: rgba(248, 248, 246, 0.78);
  --line: rgba(20, 20, 20, 0.12);
  --line-strong: rgba(20, 20, 20, 0.24);
  --accent: #9a2b2b;
  --accent-strong: #7d2222;
  --on-accent: #ffffff;

  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 40px;
  --s5: 64px;
  --s6: 96px;

  /* 固定字号档：断点切换，不用 vw 连续缩放 */
  --text-hero: 2.5rem; /* 40px */
  --text-h2: 1.75rem; /* 28px */
  --text-h3: 1.125rem; /* 18px */
  --text-role: 0.75rem; /* 12px */
  --text-body: 1rem;
  --text-note: 0.8125rem; /* 13px */

  --text-huge: 12.5rem; /* 200px 装饰大字 */

  --w-regular: 400;
  --w-semibold: 600;
  --w-heavy: 800;

  --radius: 8px;
  --max: 1280px;
  --nav-h: 64px;
}

@media (min-width: 640px) {
  :root {
    --text-hero: 2.75rem; /* 44px */
  }
}

@media (min-width: 1024px) {
  :root {
    --text-hero: 3.25rem; /* 52px */
    --text-h2: 2rem; /* 32px */
    --text-h3: 1.25rem; /* 20px */
    --text-role: 0.8125rem; /* 13px */
    --text-huge: 17.5rem; /* 280px */
    --nav-h: 72px;
  }
}

@media (min-width: 1280px) {
  :root {
    --text-hero: 4rem; /* 64px */
    --text-h2: 2.25rem; /* 36px */
    --text-role: 0.8125rem;
    --text-note: 0.875rem; /* 14px */
    --text-huge: 21.25rem; /* 340px */
  }
}

@media (min-width: 1440px) {
  :root {
    --text-hero: 4.5rem; /* 72px */
    --text-h2: 2.5rem; /* 40px */
    --text-h3: 1.375rem; /* 22px */
    --text-role: 0.875rem; /* 14px */
    --text-huge: 23.75rem; /* 380px */
  }
}

/* base */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + var(--s2));
  background: var(--paper);
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--paper);
  color: var(--ink);
  font-family:
    system-ui,
    -apple-system,
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  font-size: var(--text-body);
  font-weight: var(--w-regular);
  line-height: 1.7;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

h1,
h2,
h3,
p,
dl,
dd,
figure,
ul {
  margin: 0;
}

ul {
  padding: 0;
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* layout */
section {
  padding: var(--s5) var(--s3);
  max-width: var(--max);
  margin: 0 auto;
}

@media (min-width: 1024px) {
  section {
    padding: var(--s6) var(--s4);
  }
}

/* section label：中文名 + 序号 + 拉丁名 */
.section-label {
  display: flex;
  align-items: baseline;
  gap: var(--s2);
  margin-bottom: var(--s3);
  font-size: var(--text-h2);
  font-weight: var(--w-heavy);
  line-height: 1.2;
}

.section-label__index {
  color: var(--accent);
  font-size: var(--text-note);
  font-weight: var(--w-semibold);
}

.section-label__latin {
  color: var(--muted);
  font-size: var(--text-note);
  font-weight: var(--w-semibold);
}

/* nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s1);
  min-height: var(--nav-h);
  padding: 0 var(--s2);
  border-bottom: 1px solid var(--line);
  background: rgba(248, 248, 246, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.brand {
  display: inline-grid;
  align-content: center;
  gap: 2px;
  min-height: 44px;
  line-height: 1.2;
}

.brand strong {
  font-size: 0.95rem;
  font-weight: var(--w-heavy);
  white-space: nowrap;
}

.brand span {
  display: none;
  color: var(--muted);
  font-size: 0.72rem;
}

/* 无 JS：移动导航直接平铺；有 JS：收进汉堡面板 */
.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  width: 100%;
  padding-bottom: var(--s1);
  font-size: var(--text-note);
  font-weight: var(--w-semibold);
}

.js .nav-links {
  display: none;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  padding-bottom: var(--s2);
}

.js .nav-links.is-open {
  display: flex;
}

.nav-links a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--s1);
  border-bottom: 2px solid transparent;
  color: var(--muted);
  transition:
    color 0.25s ease,
    border-color 0.25s ease;
}

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

.nav-links a.is-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.js .nav-toggle {
  display: inline-flex;
}

.nav-toggle__bar {
  width: 20px;
  height: 2px;
  background: var(--ink);
}

@media (min-width: 640px) {
  .site-header {
    gap: var(--s2);
    padding: 0 var(--s3);
  }

  .brand strong {
    font-size: 1.05rem;
  }

  .brand span {
    display: block;
  }
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }

  .js .nav-toggle {
    display: none;
  }

  .nav-links,
  .js .nav-links {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--s3);
    width: auto;
    padding-bottom: 0;
  }

  .nav-links a {
    padding: 0 var(--s1);
  }
}

/* buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s1);
  min-height: 44px;
  padding: 0 var(--s3);
  border-radius: var(--radius);
  font-size: var(--text-note);
  font-weight: var(--w-semibold);
  transition:
    transform 0.15s ease,
    background-color 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease;
}

.button:active {
  transform: translateY(1px);
}

.button--primary {
  background: var(--ink);
  color: var(--on-dark);
}

.button--primary:hover {
  background: var(--accent);
}

.button--primary::after,
.button--ghost::after {
  content: "→";
}

.button--ghost {
  border: 1px solid var(--line-strong);
  color: var(--ink);
}

.button--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* hero：移动 文案在上、人物大图在下；桌面 左文右人物 */
.hero {
  display: grid;
  gap: var(--s4);
  padding-top: var(--s4);
  padding-bottom: 0;
  border-bottom: 1px solid var(--line);
}

.hero__copy {
  max-width: 36rem;
}

.hero__label {
  margin-bottom: var(--s2);
  color: var(--accent);
  font-size: var(--text-note);
  font-weight: var(--w-semibold);
}

.hero h1 {
  font-size: var(--text-hero);
  font-weight: var(--w-heavy);
  line-height: 1.15;
}

.hero h1 span {
  display: block;
  white-space: nowrap;
}

.hero__role {
  margin-top: var(--s2);
  color: var(--muted);
  font-size: var(--text-role);
  font-weight: var(--w-semibold);
}

.hero__intro {
  margin-top: var(--s3);
  max-width: 30rem;
  color: var(--muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  margin-top: var(--s3);
}

/* 人物区：淡「做」字垫底，人物贴底，红章点缀 */
.hero__visual {
  position: relative;
  height: 36dvh;
  min-height: 280px;
  overflow: hidden;
}

.hero__huge {
  position: absolute;
  left: -2%;
  bottom: 10%;
  z-index: 0;
  color: rgba(20, 20, 20, 0.08);
  font-family: ui-serif, "Songti SC", "SimSun", Georgia, serif;
  font-size: var(--text-huge);
  font-weight: var(--w-heavy);
  line-height: 0.9;
  user-select: none;
}

.hero__portrait {
  position: relative;
  z-index: 1;
  width: 112%;
  max-width: none;
  margin-left: -6%;
  mix-blend-mode: darken;
  object-fit: cover;
  object-position: center top;
}

.hero__seal {
  position: absolute;
  right: var(--s2);
  bottom: var(--s2);
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 4px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 1.25rem;
  font-weight: var(--w-heavy);
  line-height: 1;
}

@media (min-width: 1024px) {
  .hero {
    grid-template-columns: 0.45fr 0.55fr;
    align-items: stretch;
    gap: var(--s5);
    min-height: min(calc(100dvh - 136px), 760px);
    padding-top: 0;
  }

  .hero__copy {
    align-self: center;
    padding: var(--s5) 0;
  }

  .hero__visual {
    height: auto;
    min-height: 0;
    overflow: visible;
  }

  .hero__portrait {
    position: absolute;
    right: 0;
    bottom: 0;
    width: 88%;
    height: 92%;
    margin-left: 0;
  }

  .hero__huge {
    left: -6%;
    bottom: 6%;
  }

  .hero__seal {
    width: 44px;
    height: 44px;
  }
}

@media (min-width: 1440px) {
  .hero {
    grid-template-columns: 0.42fr 0.58fr;
    min-height: min(calc(100dvh - 136px), 820px);
  }
}

/* 首屏进入编排：JS 依次加 .is-in。隐藏态挂在 .js 下，无 JS 时内容直接可见 */
.hero__copy > *,
.hero__visual > * {
  transition:
    opacity 0.55s ease,
    transform 0.55s ease;
}

.js .hero__copy > *,
.js .hero__visual > * {
  opacity: 0;
  transform: translateY(18px);
}

.js .hero__copy > *.is-in,
.js .hero__visual > *.is-in {
  opacity: 1;
  transform: none;
}

/* about：关于我 + 能力。顶部节奏收紧，让标签贴进首屏底缘 */
.about {
  display: grid;
  gap: var(--s4);
  padding-top: var(--s3);
}

.about__intro p {
  max-width: 34rem;
  color: var(--muted);
}

.about__intro p + p {
  margin-top: var(--s2);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s3) var(--s4);
}

.skills-grid li {
  display: grid;
  gap: 2px;
  padding-top: var(--s2);
  border-top: 1px solid var(--line);
}

.skills-grid strong {
  font-size: var(--text-h3);
  font-weight: var(--w-semibold);
}

.skills-grid span {
  color: var(--muted);
  font-size: var(--text-note);
}

@media (min-width: 1024px) {
  .about {
    grid-template-columns: 1fr 1fr;
    gap: var(--s6);
  }
}

/* featured：左大卡 + 右栏两条，视觉强弱分明 */
.featured__header {
  display: grid;
  gap: var(--s2);
}

.featured__header .section-label {
  margin-bottom: 0;
}

.featured__note {
  color: var(--muted);
  font-size: var(--text-note);
}

.featured__note [data-project-count] {
  color: var(--accent);
  font-weight: var(--w-heavy);
  font-variant-numeric: tabular-nums;
}

.featured__note a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--accent);
  font-weight: var(--w-semibold);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.featured__note a:hover {
  border-bottom-color: var(--accent);
}

.featured__grid {
  display: grid;
  gap: var(--s4);
  margin-top: var(--s4);
}

/* 主卡：大图满铺，文字压图下缘 */
.feature-card {
  display: grid;
  gap: var(--s2);
  align-content: start;
}

.feature-card--primary {
  position: relative;
  min-height: 420px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink);
}

.feature-card--primary .feature-card__media {
  position: absolute;
  inset: 0;
}

.feature-card--primary .feature-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.feature-card--primary:hover .feature-card__media img {
  transform: scale(1.05);
}

.feature-card--primary .feature-card__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  display: grid;
  gap: var(--s1);
  padding: var(--s3);
  color: var(--on-dark);
}

.feature-card--primary .feature-card__summary {
  color: var(--on-dark-muted);
}

.feature-card--primary .feature-card__link {
  color: var(--on-dark);
  border-bottom-color: rgba(248, 248, 246, 0.4);
}

.feature-card--primary .feature-card__link:hover {
  border-bottom-color: var(--on-dark);
}

/* 次卡：图上文下 */
.feature-card--secondary .feature-card__media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.feature-card--secondary .feature-card__media img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top;
  transition: transform 0.35s ease;
}

.feature-card--secondary:hover .feature-card__media img {
  transform: scale(1.05);
}

.feature-card__index {
  color: var(--muted);
  font-size: var(--text-note);
  font-variant-numeric: tabular-nums;
}

.feature-card--primary .feature-card__index {
  color: var(--on-dark-muted);
}

.feature-card__kicker {
  display: inline-flex;
  width: fit-content;
  padding: 2px var(--s1);
  border-radius: 4px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: var(--text-role);
  font-weight: var(--w-semibold);
}

.feature-card h3 {
  font-size: var(--text-h3);
  font-weight: var(--w-heavy);
}

.feature-card__summary {
  font-size: var(--text-note);
}

.feature-card__meta {
  display: flex;
  align-items: center;
  gap: var(--s2);
  flex-wrap: wrap;
}

.feature-card__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  width: fit-content;
  color: var(--accent);
  font-size: var(--text-note);
  font-weight: var(--w-semibold);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.feature-card__link:hover {
  border-bottom-color: var(--accent);
}

@media (min-width: 1024px) {
  .featured {
    padding-top: var(--s5);
  }

  .featured__header {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .featured__note {
    text-align: right;
  }

  /* 两条受控行：右卡各 348px，主卡跨两行 = 348*2+24 = 720px */
  .featured__grid {
    grid-template-columns: 1.25fr 0.75fr;
    grid-template-rows: repeat(2, 348px);
    gap: var(--s3) var(--s4);
  }

  .feature-card--primary {
    grid-row: span 2;
  }

  .feature-card--primary .feature-card__body {
    padding: var(--s4);
  }

  /* 右卡：媒体吃剩余高度，body 两行截断保节奏 */
  .feature-card--secondary {
    grid-template-rows: minmax(0, 1fr) auto;
  }

  .feature-card--secondary .feature-card__media {
    min-height: 0;
  }

  .feature-card--secondary .feature-card__media img {
    height: 100%;
  }

  .feature-card--secondary .feature-card__summary {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
}

/* ledger：紧凑列表，视觉退居次级 */
.ledger__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s3);
  flex-wrap: wrap;
}

.ledger h2 {
  font-size: var(--text-h2);
  font-weight: var(--w-heavy);
  line-height: 1.2;
}

.ledger__count {
  color: var(--muted);
  font-size: var(--text-note);
}

.ledger__count [data-project-count] {
  color: var(--accent);
  font-weight: var(--w-heavy);
  font-variant-numeric: tabular-nums;
}

.ledger__filters {
  display: flex;
  gap: var(--s1);
  margin-top: var(--s3);
  padding-bottom: var(--s1);
  overflow-x: auto;
}

.ledger__filters button {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 0 var(--s2);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: var(--text-note);
  font-weight: var(--w-semibold);
  cursor: pointer;
  transition:
    color 0.2s ease,
    border-color 0.2s ease,
    background-color 0.2s ease;
}

.ledger__filters button:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.ledger__filters button[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.ledger__grid {
  display: grid;
  margin-top: var(--s3);
  border-top: 1px solid var(--line);
}

.ledger-item {
  display: grid;
  gap: var(--s1);
  padding: var(--s3) 0;
  border-bottom: 1px solid var(--line);
}

.ledger-item__top {
  display: flex;
  align-items: baseline;
  gap: var(--s2);
  flex-wrap: wrap;
}

.ledger-item__top h3 {
  font-size: var(--text-h3);
  font-weight: var(--w-semibold);
}

.ledger-item__cat {
  color: var(--muted);
  font-size: var(--text-note);
}

.ledger-item__summary {
  color: var(--ink);
}

.ledger-item__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  width: fit-content;
  color: var(--accent);
  font-size: var(--text-note);
  font-weight: var(--w-semibold);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.ledger-item__link:hover {
  border-bottom-color: var(--accent);
}

@media (min-width: 1024px) {
  .ledger-item {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: var(--s1) var(--s4);
  }

  .ledger-item__top,
  .ledger-item__summary,
  .ledger-item__link {
    grid-column: 1 / -1;
  }
}

.ledger__noscript {
  margin-top: var(--s3);
  color: var(--muted);
}

/* websites */
.websites {
  display: grid;
  gap: var(--s4);
}

.websites h2 {
  font-size: var(--text-h2);
  font-weight: var(--w-heavy);
  line-height: 1.2;
}

.websites__copy p {
  margin-top: var(--s2);
  color: var(--muted);
  max-width: 32rem;
}

.websites__copy .button {
  margin-top: var(--s3);
}

.websites__thumbs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s2);
}

.websites__thumbs img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: top;
}

@media (prefers-reduced-motion: no-preference) {
  .websites__thumbs img {
    transition: transform 0.35s ease;
  }

  .websites__thumbs img:hover {
    transform: scale(1.03);
  }
}

@media (min-width: 1024px) {
  .websites {
    grid-template-columns: 1fr 1.2fr;
    align-items: center;
  }
}

/* contact */
.contact {
  border-top: 1px solid var(--line);
}

.contact h2 {
  font-size: var(--text-h2);
  font-weight: var(--w-heavy);
  line-height: 1.2;
}

.contact p {
  margin-top: var(--s2);
  color: var(--muted);
}

.contact .button {
  margin-top: var(--s3);
}

/* footer */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s2);
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--s3);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: var(--text-note);
}

.site-footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ink);
  font-weight: var(--w-semibold);
}

/* motion & reduced-motion */
.reveal {
  transition:
    opacity 0.5s ease,
    transform 0.5s ease;
}

.js .reveal {
  opacity: 0;
  transform: translateY(20px);
}

.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal,
  .hero__copy > *,
  .hero__visual > * {
    opacity: 1 !important;
    transform: none !important;
  }
}