/* ==========================================================================
   猫图 MAOTU · 个人作品集
   --------------------------------------------------------------------------
   结构参照用户手绘框架（10 区块单页）
   视觉参照 uelike.com：极简浅色 + 蓝色点缀 + 超大双语标题
   --------------------------------------------------------------------------
   1. 设计令牌
   2. 基础与通用组件
   3. 导航
   4. Hero
   5. 我做什么（四卡）
   6. 关于我
   7. 创作案例
   8. 工作逻辑（四步）
   9. 技能清单
   10. 大字标语 / 联系区 / 页脚
   11. 响应式
   ========================================================================== */

/* ------------------------------ 1. 设计令牌 ------------------------------ */
:root {
  --c-bg: #eaf1f4;            /* 浅蓝灰底 */
  --c-surface: #ffffff;
  --c-ink: #16232b;           /* 近黑，带一点蓝 */
  --c-text: #45535c;
  --c-muted: #7c8a93;
  --c-blue: #2563eb;          /* 蓝色点缀 */
  --c-blue-deep: #1d4ed8;
  --c-blue-soft: #dbe7fb;
  --c-line: #d8e2e8;
  --c-dark: #10181d;          /* 深色联系区 */

  --fs-display: clamp(3rem, 1.4rem + 6.4vw, 7rem);
  --fs-h2: clamp(1.75rem, 1.1rem + 2.2vw, 3rem);
  --fs-h3: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
  --fs-body: 1rem;

  --sp-section: clamp(72px, 9vw, 150px);
  --gap: clamp(20px, 2.6vw, 36px);
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(22, 35, 43, 0.06);
  --shadow: 0 18px 44px -18px rgba(22, 35, 43, 0.22);
  --maxw: 1180px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------------------------- 2. 基础与通用 ------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4 {
  margin: 0;
  color: var(--c-ink);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

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

:focus-visible {
  outline: 3px solid var(--c-blue);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}

.section {
  padding-block: var(--sp-section);
}

/* 区块标题组：左上小标 + 大标题 */
.sec-head {
  margin-bottom: clamp(36px, 4.6vw, 64px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 18px;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-blue);
}

.sec-head h2 {
  font-size: var(--fs-h2);
  max-width: 20ch;
  text-wrap: balance;
}

.sec-head p {
  margin-top: 14px;
  max-width: 560px;
  color: var(--c-muted);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 30px;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 700;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s, color 0.25s,
    border-color 0.25s;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--c-blue);
  color: #fff;
  box-shadow: 0 12px 28px -12px rgba(37, 99, 235, 0.65);
}

.btn--primary:hover {
  background: var(--c-blue-deep);
}

.btn--ghost {
  border-color: var(--c-ink);
  color: var(--c-ink);
}

.btn--ghost:hover {
  background: var(--c-ink);
  color: #fff;
}

.btn--light {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.btn--light:hover {
  background: #fff;
  color: var(--c-ink);
}

/* 滚动入场 */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ------------------------------- 3. 导航 -------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(234, 241, 244, 0.86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.site-header.is-stuck {
  border-bottom-color: var(--c-line);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.brand__logo {
  width: 30px;
  height: auto;
  /* logo 是白底 PNG：multiply 让白底在浅色背景上消失 */
  mix-blend-mode: multiply;
}

.brand__text {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}

.brand span {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--c-muted);
  text-transform: uppercase;
}

.nav__menu {
  display: flex;
  gap: clamp(20px, 3vw, 40px);
}

.nav__link {
  position: relative;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text);
  padding-block: 6px;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--c-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav__link:hover::after {
  transform: scaleX(1);
}

.nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1.5px solid var(--c-line);
  border-radius: 12px;
  background: var(--c-surface);
  cursor: pointer;
  padding: 0;
  place-items: center;
}

.nav__toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-ink);
  position: relative;
  transition: background 0.2s;
}

.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--c-ink);
  transition: transform 0.3s var(--ease);
}

.nav__toggle span::before { top: -5px; }
.nav__toggle span::after { top: 5px; }

.nav__toggle[aria-expanded="true"] span { background: transparent; }
.nav__toggle[aria-expanded="true"] span::before { transform: translateY(5px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span::after { transform: translateY(-5px) rotate(-45deg); }

/* ------------------------------- 4. Hero -------------------------------- */
.hero {
  min-height: 92dvh;
  display: grid;
  align-content: center;
  padding-top: 110px;
  position: relative;
  overflow: hidden;
}

.hero__kicker {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 20px;
}

.hero__title {
  font-size: var(--fs-display);
  line-height: 1.02;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.hero__title em {
  font-style: normal;
  color: var(--c-blue);
}

.hero__lede {
  margin-top: 28px;
  max-width: 520px;
  font-size: 1.0625rem;
  color: var(--c-text);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

.hero__meta {
  position: absolute;
  right: clamp(20px, 4vw, 40px);
  bottom: 32px;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-muted);
  writing-mode: vertical-rl;
}

/* Hero 右侧人物视频：AI 抠背景透明 WebM，飘浮动画 */
.hero__video {
  position: absolute;
  right: clamp(60px, 15vw, 300px);
  top: 50%;
  transform: translateY(-46%);
  width: clamp(280px, 32vw, 470px);
  height: auto;
  aspect-ratio: 496 / 864;
  object-fit: cover;
  opacity: 0.98;
  filter: drop-shadow(0 24px 40px rgba(30, 64, 175, 0.14));
  animation: heroFloat 6s ease-in-out infinite;
  z-index: -1;
}

@keyframes heroFloat {
  0%, 100% { transform: translateY(-46%); }
  50% { transform: translateY(calc(-46% - 16px)); }
}

@media (prefers-reduced-motion: reduce) {
  .hero__video { animation: none; }
}

/* 背景装饰：大圆 + 网格点，克制 */
.hero::before {
  content: "";
  position: absolute;
  right: -14vw;
  top: 8vh;
  width: 46vw;
  height: 46vw;
  max-width: 620px;
  max-height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, #ffffff 0%, var(--c-blue-soft) 62%, transparent 100%);
  opacity: 0.85;
  z-index: -1;
}

.hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 160px;
  background: radial-gradient(circle, var(--c-blue) 1px, transparent 1.4px) 0 0 / 26px 26px;
  opacity: 0.1;
  z-index: -1;
  mask-image: linear-gradient(180deg, transparent, #000);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000);
}

/* --------------------------- 5. 我做什么（四卡） ------------------------- */
.how__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}

.how-card {
  background: var(--c-surface);
  border-radius: var(--radius-lg);
  padding: 34px 28px 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid transparent;
  transition: transform 0.35s var(--ease), box-shadow 0.35s, border-color 0.35s;
}

.how-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
  border-color: var(--c-blue-soft);
}

.how-card__icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 22px;
  background: var(--c-blue-soft);
  color: var(--c-blue);
}

.how-card h3 {
  font-size: var(--fs-h3);
  margin-bottom: 10px;
}

.how-card p {
  font-size: 0.9375rem;
  color: var(--c-muted);
}

.how-card__no {
  display: block;
  margin-top: 22px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--c-blue);
}

/* 表情互动：四卡下方的角色视频，悬停卡片切表情 */
.mood {
  margin-top: clamp(40px, 6vw, 72px);
  text-align: center;
}

.mood__stage {
  position: relative;
  display: inline-block;
  width: min(300px, 64vw);
  aspect-ratio: 720 / 1280;
}

.mood__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  filter: drop-shadow(0 24px 44px rgba(30, 64, 175, 0.16));
  transition: opacity 0.22s ease;
  pointer-events: none;
}

.mood__video.is-active {
  opacity: 1;
}

.mood__hint {
  margin-top: 6px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-muted);
  transition: opacity 0.3s;
}

.mood.is-reacting .mood__hint {
  opacity: 0;
}

/* ------------------------------ 6. 关于我 ------------------------------- */
.about {
  background: var(--c-surface);
  border-block: 1px solid var(--c-line);
}

.about__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(36px, 6vw, 90px);
  align-items: center;
}

.about h2 {
  font-size: var(--fs-h2);
  margin-bottom: 24px;
}

.about h2 em {
  font-style: normal;
  background: linear-gradient(transparent 62%, var(--c-blue-soft) 62%);
}

.about p {
  color: var(--c-muted);
  margin-bottom: 16px;
  max-width: 540px;
}

.about__facts {
  display: grid;
  grid-template-columns: repeat(3, auto);
  justify-content: start;
  gap: clamp(28px, 4vw, 56px);
  margin-top: 36px;
}

.fact strong {
  display: block;
  font-size: clamp(1.6rem, 1.1rem + 1.4vw, 2.2rem);
  font-weight: 800;
  color: var(--c-ink);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.fact span {
  font-size: 0.8125rem;
  color: var(--c-muted);
}

.about__media {
  position: relative;
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 4.6;
  background: linear-gradient(160deg, #f4f8fb, var(--c-blue-soft));
  overflow: hidden;
  display: grid;
  place-items: center;
}

.about__media::after {
  content: "头像 / 形象照占位";
  position: absolute;
  bottom: 16px;
  left: 16px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(4px);
  font-size: 0.6875rem;
  color: var(--c-muted);
}

/* ------------------------------ 7. 创作案例 ------------------------------ */
.cases {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 5vw, 72px) clamp(28px, 4vw, 56px);
}

.case {
  display: block;
  text-decoration: none;
}

.case__shot {
  aspect-ratio: 8 / 5.2;
  border-radius: 14px;
  overflow: hidden;
  background: var(--c-surface);
  box-shadow: var(--shadow-sm);
}

.case__shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s var(--ease);
}

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

.case:hover .case__title {
  color: var(--c-blue);
}

.case__title {
  font-size: clamp(1.25rem, 1rem + 0.9vw, 1.625rem);
  margin-top: 20px;
  transition: color 0.3s;
}

.case__sub {
  font-size: 0.875rem;
  color: var(--c-muted);
  margin-top: 6px;
}

/* --------------------------- 8. 工作逻辑（四步） ------------------------- */
.logic {
  background: var(--c-surface);
  border-block: 1px solid var(--c-line);
}

.logic__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
  counter-reset: step;
}

.logic-card {
  position: relative;
  padding-top: 26px;
  border-top: 2px solid var(--c-line);
  transition: border-color 0.3s, transform 0.35s var(--ease);
}

.logic-card:hover {
  border-top-color: var(--c-blue);
  transform: translateY(-4px);
}

.logic-card::before {
  counter-increment: step;
  content: "0" counter(step);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--c-blue);
}

.logic-card h3 {
  margin-top: 14px;
  font-size: var(--fs-h3);
  margin-bottom: 10px;
}

.logic-card p {
  font-size: 0.9375rem;
  color: var(--c-muted);
}

/* ------------------------------ 9. 技能清单 ------------------------------ */
.skill__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(36px, 5vw, 80px);
  align-items: start;
}

.skill-list {
  display: grid;
}

.skill-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--c-line);
  transition: padding 0.3s var(--ease), background 0.3s;
}

.skill-item:first-child {
  border-top: 1px solid var(--c-line);
}

.skill-item:hover {
  background: rgba(255, 255, 255, 0.7);
  padding-inline: 14px;
}

.skill-item h3 {
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.skill-item span {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-blue);
}

.skill__board {
  position: relative;
  border-radius: var(--radius-lg);
  background: var(--c-surface);
  box-shadow: var(--shadow-sm);
  aspect-ratio: 4 / 4.4;
  padding: 28px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 16px;
}

.skill__board-bar {
  height: 12px;
  border-radius: 999px;
  background: var(--c-ink);
  width: 46%;
}

.skill__board-blocks {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 14px;
}

.skill__board-blocks i {
  border-radius: 12px;
  background: var(--c-blue-soft);
}

.skill__board-blocks i:nth-child(2) {
  background: var(--c-blue);
  opacity: 0.85;
}

.skill__board-plus {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1.5px solid var(--c-line);
  display: grid;
  place-items: center;
  color: var(--c-blue);
  font-size: 1.375rem;
  justify-self: end;
}

/* ---------------------- 10. 大字标语 / 联系区 / 页脚 ---------------------- */
.slogan {
  padding-block: clamp(48px, 6vw, 90px);
  overflow: hidden;
}

.slogan h2 {
  font-size: clamp(2.25rem, 1.2rem + 5vw, 5.25rem);
  letter-spacing: -0.03em;
  white-space: nowrap;
  color: var(--c-ink);
}

.slogan h2 em {
  font-style: normal;
  color: var(--c-blue);
}

.contact {
  background: var(--c-dark);
  color: rgba(255, 255, 255, 0.72);
  padding-block: var(--sp-section);
  position: relative;
  overflow: hidden;
}

.contact::before {
  content: "";
  position: absolute;
  right: -10vw;
  bottom: -16vw;
  width: 36vw;
  height: 36vw;
  border-radius: 50%;
  border: 1.5px dashed rgba(37, 99, 235, 0.55);
}

.contact h2 {
  color: #fff;
  font-size: var(--fs-h2);
  margin-bottom: 14px;
}

.contact h2 em {
  font-style: normal;
  color: #6ea8ff;
}

.contact__mail {
  display: inline-block;
  margin: 30px 0 36px;
  font-size: clamp(1.25rem, 0.9rem + 1.8vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #fff;
  border-bottom: 2px solid rgba(255, 255, 255, 0.25);
  padding-bottom: 6px;
  transition: border-color 0.3s, color 0.3s;
}

.contact__mail:hover {
  border-color: #6ea8ff;
  color: #6ea8ff;
}

.site-footer {
  background: var(--c-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: 26px;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
}

/* ------------------------------ 11. 响应式 ------------------------------- */
@media (max-width: 1024px) {
  .how__grid,
  .logic__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about__grid,
  .skill__grid {
    grid-template-columns: 1fr;
  }
  .about__media {
    order: -1;
    max-width: 440px;
  }
  .skill__board {
    max-width: 440px;
  }
}

@media (max-width: 768px) {
  .nav__toggle {
    display: grid;
  }
  .nav__menu {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    gap: 0;
    background: var(--c-surface);
    padding: 8px 24px 26px;
    border-bottom: 1px solid var(--c-line);
    box-shadow: var(--shadow);
    transform: translateY(-130%);
    transition: transform 0.4s var(--ease);
  }
  .nav__menu.is-open {
    transform: none;
  }
  .nav__link {
    padding-block: 16px;
    border-bottom: 1px solid var(--c-line);
  }
  .nav__link::after {
    display: none;
  }
  .cases {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero {
    min-height: 84dvh;
  }
  .hero__meta {
    display: none;
  }
  .hero__video {
    width: 150px;
    right: 8px;
    top: auto;
    bottom: 4vh;
    transform: none;
    opacity: 0.85;
    animation: none;
    filter: drop-shadow(0 14px 24px rgba(30, 64, 175, 0.12));
  }
  @keyframes heroFloat {
    0%, 100% { transform: none; }
    50% { transform: translateY(-10px); }
  }
  .hero__facts .fact {
    min-width: 96px;
  }
}

@media (max-width: 560px) {
  .how__grid,
  .logic__grid,
  .about__facts {
    grid-template-columns: 1fr 1fr;
  }
  .slogan h2 {
    white-space: normal;
  }
  .hero__video {
    display: none;
  }
}

/* ------------------------------ 鼠标跟随光斑 ------------------------------ */
.cursor-glow {
  position: fixed;
  left: 0;
  top: 0;
  width: 560px;
  height: 560px;
  margin: -280px 0 0 -280px;
  border-radius: 50%;
  background: radial-gradient(
    circle closest-side,
    rgba(103, 232, 249, 0.30),
    rgba(96, 165, 250, 0.20) 45%,
    rgba(37, 99, 235, 0) 72%
  );
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.6s ease;
  will-change: transform;
}

.cursor-glow.is-on {
  opacity: 1;
}

/* 内容层置于光斑之上，文字始终清晰 */
main > section {
  position: relative;
  z-index: 1;
}

@media (pointer: coarse) {
  .cursor-glow {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cursor-glow {
    display: none;
  }
}