/* ============================================================
   光 与 我 · 样式
   纯 CSS，无外部依赖。支持浅色 / 深色双主题。
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --bg: #faf8f5;
  --bg-soft: #f3efe8;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #2a2622;
  --text-soft: #6e665d;
  --border: rgba(42, 38, 34, 0.10);
  --accent: #e09b2d;
  --accent-2: #f6c768;
  --accent-soft: rgba(224, 155, 45, 0.14);
  --glow: rgba(246, 199, 104, 0.55);
  --shadow: 0 18px 50px -22px rgba(80, 60, 20, 0.35);
  --nav-bg: rgba(250, 248, 245, 0.72);
  --blob-1: rgba(246, 199, 104, 0.55);
  --blob-2: rgba(255, 179, 138, 0.40);
  --blob-3: rgba(180, 200, 255, 0.30);
  --grad: linear-gradient(120deg, #e09b2d 0%, #f6c768 55%, #ffd98a 100%);
}

[data-theme="dark"] {
  --bg: #0c0b12;
  --bg-soft: #121119;
  --surface: rgba(28, 26, 38, 0.66);
  --surface-solid: #17151f;
  --text: #f2efe9;
  --text-soft: #a39e96;
  --border: rgba(255, 255, 255, 0.10);
  --accent: #ffcf7a;
  --accent-2: #ffb86b;
  --accent-soft: rgba(255, 207, 122, 0.14);
  --glow: rgba(255, 207, 122, 0.30);
  --shadow: 0 24px 60px -26px rgba(0, 0, 0, 0.75);
  --nav-bg: rgba(12, 11, 18, 0.66);
  --blob-1: rgba(255, 207, 122, 0.22);
  --blob-2: rgba(255, 138, 120, 0.16);
  --blob-3: rgba(120, 150, 255, 0.18);
  --grad: linear-gradient(120deg, #ffcf7a 0%, #ffb86b 55%, #ffe1a8 100%);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color 0.5s ease, color 0.5s ease;
}

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

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; margin: 0; }

/* ---------- 背景光晕 ---------- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.aurora__blob {
  position: absolute;
  width: 46vw;
  height: 46vw;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.9;
  will-change: transform;
}
.aurora__blob--1 {
  background: var(--blob-1);
  top: -10vw; left: -8vw;
  animation: drift1 22s ease-in-out infinite;
}
.aurora__blob--2 {
  background: var(--blob-2);
  top: 30vh; right: -12vw;
  animation: drift2 26s ease-in-out infinite;
}
.aurora__blob--3 {
  background: var(--blob-3);
  bottom: -14vw; left: 25vw;
  animation: drift3 30s ease-in-out infinite;
}
@keyframes drift1 {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(6vw, 4vh) scale(1.12); }
}
@keyframes drift2 {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(-5vw, 6vh) scale(1.08); }
}
@keyframes drift3 {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(4vw, -5vh) scale(1.15); }
}

/* ---------- 导航栏 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1.2rem, 4vw, 3rem);
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background-color 0.5s ease;
}
.nav.is-scrolled { border-bottom-color: var(--border); }

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}
.nav__brand-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 14px 2px var(--glow);
  animation: pulse 3.5s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.25); opacity: 0.8; }
}
.nav__links {
  display: flex;
  gap: clamp(1rem, 3vw, 2.2rem);
  font-size: 0.95rem;
}
.nav__links a {
  position: relative;
  color: var(--text-soft);
  transition: color 0.25s ease;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transition: width 0.3s ease;
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { width: 100%; }

.nav__actions { display: flex; align-items: center; gap: 0.6rem; }

/* 主题切换按钮 */
.theme-toggle {
  position: relative;
  width: 42px; height: 42px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform 0.25s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.theme-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.theme-toggle svg {
  width: 20px; height: 20px;
  position: absolute;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  transition: opacity 0.35s ease, transform 0.5s ease;
}
.theme-toggle__sun { opacity: 1; transform: rotate(0) scale(1); }
.theme-toggle__moon { opacity: 0; transform: rotate(-90deg) scale(0.6); }
[data-theme="dark"] .theme-toggle__sun { opacity: 0; transform: rotate(90deg) scale(0.6); }
[data-theme="dark"] .theme-toggle__moon { opacity: 1; transform: rotate(0) scale(1); }

/* 汉堡按钮（移动端） */
.nav__menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
}
.nav__menu-btn span {
  display: block;
  width: 18px; height: 2px;
  margin: 0 auto;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav__menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.78rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.96rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.25s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}
.btn--primary {
  background: var(--grad);
  color: #2a200a;
  box-shadow: 0 10px 26px -10px var(--glow);
}
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 16px 34px -10px var(--glow); }
.btn--ghost {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}
.btn--ghost:hover { transform: translateY(-3px); border-color: var(--accent); }
.btn--lg { padding: 0.95rem 2rem; font-size: 1.05rem; }

/* ---------- 首屏 ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 7rem clamp(1.2rem, 5vw, 3rem) 4rem;
}
.hero__inner { max-width: 760px; }
.hero__eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.4rem;
  font-weight: 600;
}
.hero__title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  margin-bottom: 1.5rem;
}
.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__lede {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--text-soft);
  max-width: 600px;
  margin: 0 auto 2.4rem;
}
.hero__cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.hero__scroll {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-soft);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
}
.hero__scroll-line {
  width: 1px; height: 42px;
  background: linear-gradient(var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%,100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ---------- 通用区块 ---------- */
.section {
  padding: clamp(4rem, 10vw, 8rem) clamp(1.2rem, 5vw, 3rem);
  max-width: 1120px;
  margin: 0 auto;
}
.section__head { text-align: center; margin-bottom: 3.5rem; }
.section__kicker {
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  font-weight: 700;
  margin: 0 0 0.8rem;
}
.section__title { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; }
.section__sub { color: var(--text-soft); margin: 1rem auto 0; max-width: 520px; }

/* ---------- 开发理念 ---------- */
.principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}
.principle {
  background: var(--surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 2rem 1.8rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.principle:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: transparent;
}
.principle__no {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.8rem;
}
.principle__title { font-size: 1.4rem; font-weight: 700; margin-bottom: 0.7rem; }
.principle__text { color: var(--text-soft); font-size: 0.98rem; margin: 0; }

/* ---------- 作品卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.6rem;
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 1.8rem;
  overflow: hidden;
  transition: transform 0.35s cubic-bezier(.2,.8,.2,1), box-shadow 0.35s ease, border-color 0.35s ease;
}
.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.35s ease;
}
.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}
.card:hover::before { opacity: 0.9; }

.card__icon {
  width: 64px; height: 64px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: var(--grad);
  color: #2a200a;
  box-shadow: 0 10px 24px -8px var(--glow);
  margin-bottom: 1.3rem;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}
.card:hover .card__icon { transform: scale(1.06) rotate(-3deg); }
.card__icon svg { width: 32px; height: 32px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.card__tag {
  align-self: flex-start;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 0.8rem;
}
.card__name { font-size: 1.35rem; font-weight: 700; margin-bottom: 0.5rem; }
.card__desc { color: var(--text-soft); font-size: 0.95rem; margin: 0 0 1.4rem; flex: 1; }
.card__links { display: flex; gap: 0.7rem; flex-wrap: wrap; }
.card__link {
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  transition: background-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}
.card__link--main { background: var(--grad); color: #2a200a; border-color: transparent; }
.card__link:hover { transform: translateY(-2px); }
.card__link--main:hover { box-shadow: 0 8px 20px -8px var(--glow); }

/* ---------- 关于我 ---------- */
.about {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(1.5rem, 5vw, 3.5rem);
  align-items: center;
  background: var(--surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: clamp(2rem, 5vw, 3.5rem);
}
.about__avatar {
  position: relative;
  width: 160px; height: 160px;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--surface-solid);
  border: 1px solid var(--border);
}
.about__avatar-glow {
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  background: var(--grad);
  filter: blur(22px);
  opacity: 0.45;
  z-index: -1;
  animation: pulse 4s ease-in-out infinite;
}
.about__avatar-mark {
  font-size: 3.4rem;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.about__text { color: var(--text-soft); margin: 0 0 1rem; }
.about__facts { list-style: none; padding: 0; margin: 1.5rem 0 0; display: grid; gap: 0.6rem; }
.about__facts li {
  font-size: 0.95rem;
  color: var(--text-soft);
  padding-left: 1.1rem;
  position: relative;
}
.about__facts li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.65em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--grad);
}
.about__facts strong { color: var(--text); margin-right: 0.5rem; }

/* ---------- 联系 ---------- */
.section--contact { text-align: center; }
.contact {
  background: var(--surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: clamp(2.5rem, 6vw, 4.5rem);
}
.contact .section__sub { margin-bottom: 2rem; }
.contact__links {
  display: flex;
  gap: 1.6rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
  font-size: 0.95rem;
  color: var(--text-soft);
}
.contact__links a { transition: color 0.25s ease; position: relative; }
.contact__links a:hover { color: var(--accent); }

/* ---------- 页脚 ---------- */
.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 2rem clamp(1.2rem, 5vw, 3rem);
  border-top: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 0.88rem;
}
.footer__tag { letter-spacing: 0.08em; }

/* ---------- 滚动揭示动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(.2,.8,.2,1), transform 0.8s cubic-bezier(.2,.8,.2,1);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  .nav__menu-btn { display: flex; }
  .nav__links {
    position: fixed;
    top: 64px; right: 0;
    flex-direction: column;
    gap: 0;
    width: min(72vw, 280px);
    padding: 0.8rem;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 0 0 0 20px;
    transform: translateX(110%);
    transition: transform 0.35s cubic-bezier(.2,.8,.2,1);
    box-shadow: var(--shadow);
  }
  .nav__links.is-open { transform: translateX(0); }
  .nav__links a {
    padding: 0.9rem 1rem;
    border-radius: 12px;
    color: var(--text);
  }
  .nav__links a:hover { background: var(--accent-soft); }
  .nav__links a::after { display: none; }

  .about { grid-template-columns: 1fr; text-align: center; }
  .about__facts { text-align: left; max-width: 320px; margin-left: auto; margin-right: auto; }
  .hero { padding-top: 6rem; }
}

@media (max-width: 420px) {
  .cards { grid-template-columns: 1fr; }
  .hero__cta { width: 100%; }
  .btn { flex: 1; justify-content: center; }
}