/* ==========================================================
   jianglast 个人主页 -- 深色科技风
   色板与字体约定以 DESIGN.md 为准
   ========================================================== */

:root {
  /* 配色基准（DESIGN.md） */
  --bg: #0B0E14;
  --surface: #151B26;
  --accent: #5B8CFF;
  --text: #E6EAF2;
  --text-dim: #8A93A6;
  --line: #232B3A;

  /* 字体栈 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --maxw: 1080px;
  --header-h: 64px;
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

/* ---------- 页头 ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background-color .25s ease, border-color .25s ease;
}

.site-header.scrolled {
  background: rgba(11, 14, 20, .78);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: color .2s ease;
}

.brand:hover {
  color: var(--accent);
}

.nav {
  display: flex;
  gap: 22px;
}

.nav a {
  padding: 10px 0;
  font-size: .85rem;
  letter-spacing: .04em;
  color: var(--text-dim);
  transition: color .2s ease;
}

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

/* ---------- 首屏 ---------- */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 96px 24px 88px;
  overflow: hidden;
}

/* 中心辉光 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 52% 42% at 50% 46%, rgba(91, 140, 255, .16), transparent 70%);
  pointer-events: none;
}

/* 网格底纹（中心可见、四周淡出） */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(35, 43, 58, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 43, 58, .55) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 62% 52% at 50% 46%, #000, transparent 78%);
  mask-image: radial-gradient(ellipse 62% 52% at 50% 46%, #000, transparent 78%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-badge {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border: 1px solid rgba(91, 140, 255, .38);
  border-radius: 999px;
  background: rgba(91, 140, 255, .06);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: #9DB8FF;
}

.hero-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(91, 140, 255, .9);
}

.hero-name {
  margin: 30px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(2.9rem, 15vw, 8.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  text-shadow: 0 0 80px rgba(91, 140, 255, .3);
}

/* 终端光标 */
.caret {
  display: inline-block;
  width: .1em;
  height: .8em;
  margin-left: .06em;
  border-radius: 2px;
  background: var(--accent);
  vertical-align: -0.03em;
  animation: blink 1.1s steps(1) infinite;
}

/* 打字期间光标常亮 */
.hero-name.typing .caret {
  animation: none;
  opacity: 1;
}

@keyframes blink {
  0%, 55% { opacity: 1; }
  56%, 100% { opacity: 0; }
}

.hero-role {
  margin: 22px 0 0;
  font-size: clamp(1.05rem, 2.6vw, 1.3rem);
  letter-spacing: .1em;
  color: var(--text-dim);
}

/* 首屏入场（名字容器先行淡入，文字由打字机接管） */
.hero-badge,
.hero-role {
  opacity: 0;
  transform: translateY(18px);
  animation: rise .8s cubic-bezier(.22, .61, .36, 1) forwards;
}

.hero-role { animation-delay: .28s; }

.hero-name {
  animation: fade-in .45s ease-out .1s both;
}

@keyframes rise {
  to { opacity: 1; transform: none; }
}

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  bottom: 34px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--text-dim);
  animation: fade-in .8s ease-out .6s both;
  transition: color .2s ease;
}

.scroll-hint:hover {
  color: var(--accent);
}

.scroll-hint::after {
  content: "";
  width: 1px;
  height: 38px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: drop 2.2s ease-in-out infinite;
}

@keyframes fade-in {
  from { opacity: 0; }
}

@keyframes drop {
  0% { transform: translateY(-8px); opacity: 0; }
  35% { opacity: .9; }
  100% { transform: translateY(8px); opacity: 0; }
}

/* ---------- 板块 ---------- */

.section {
  padding: 104px 0;
}

/* 内容列居中、列内左对齐（宽屏留白平衡） */
.section .container {
  max-width: 720px;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 36px;
}

.section-index {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .18em;
  color: var(--accent);
}

.section-title {
  margin: 0;
  font-size: clamp(1.5rem, 3.4vw, 1.9rem);
  font-weight: 600;
  letter-spacing: .01em;
}

.placeholder {
  border: 1px dashed #2B3446;
  border-radius: 14px;
  padding: 46px 24px;
  text-align: center;
  font-size: .9rem;
  letter-spacing: .04em;
  color: rgba(138, 147, 166, .75);
  background: rgba(21, 27, 38, .35);
}

/* ---------- 关于我 ---------- */

.about-text {
  margin: 0;
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  line-height: 1.9;
  color: var(--text);
}

.about-name {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent);
}

.about-points {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.about-point {
  display: flex;
  align-items: baseline;
  gap: 18px;
}

.point-label {
  flex: none;
  min-width: 4.2rem;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--accent);
}

.point-desc {
  font-size: .95rem;
  color: var(--text-dim);
}

/* ---------- 我在做什么 ---------- */

.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.work-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  transition: border-color .2s ease, transform .2s ease;
}

.work-card:hover {
  border-color: rgba(91, 140, 255, .45);
  transform: translateY(-2px);
}

.work-name {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.work-desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.work-link {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--accent);
}

.work-card.is-placeholder .work-name,
.work-card.is-placeholder .work-desc,
.work-card.is-placeholder .work-link {
  color: rgba(138, 147, 166, .55);
}

/* ---------- 联系方式 ---------- */

.contact-card {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.contact-qr {
  flex: none;
  width: 148px;
  height: 148px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed #2B3446;
  border-radius: 12px;
  background: rgba(11, 14, 20, .35);
  font-size: .8rem;
  letter-spacing: .04em;
  color: rgba(138, 147, 166, .55);
}

/* 二维码图片接入时：.contact-qr img { display: block; width: 100%; height: 100%; border-radius: 12px; } */

.contact-info {
  min-width: 0;
}

.contact-title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.contact-id {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .9rem;
  letter-spacing: .02em;
  color: var(--text-dim);
}

.contact-placeholder {
  color: rgba(138, 147, 166, .55);
}

/* ---------- 滚动渐显 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s cubic-bezier(.22, .61, .36, 1), transform .7s cubic-bezier(.22, .61, .36, 1);
  transition-delay: var(--reveal-delay, 0s);
}

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

/* ---------- 404 页 ---------- */

.page-404 {
  background: radial-gradient(ellipse 50% 40% at 50% 45%, rgba(91, 140, 255, .12), transparent 70%), var(--bg);
}

.error-main {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 24px;
}

.error-code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(4rem, 16vw, 7rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--accent);
  text-shadow: 0 0 80px rgba(91, 140, 255, .35);
}

.error-title {
  margin: 20px 0 0;
  font-size: clamp(1.3rem, 3vw, 1.6rem);
  font-weight: 600;
}

.error-desc {
  margin: 12px 0 0;
  font-size: .95rem;
  color: var(--text-dim);
}

.error-back {
  margin-top: 34px;
  padding: 11px 26px;
  border: 1px solid rgba(91, 140, 255, .45);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .85rem;
  letter-spacing: .08em;
  color: var(--accent);
  transition: background-color .2s ease, border-color .2s ease;
}

.error-back:hover {
  background: rgba(91, 140, 255, .12);
  border-color: var(--accent);
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 36px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 600;
}

.footer-note {
  font-size: .8rem;
  color: var(--text-dim);
}

/* ---------- 响应式 ---------- */

@media (max-width: 640px) {
  .header-inner {
    padding: 0 20px;
  }

  .container {
    padding: 0 20px;
  }

  .nav {
    gap: 16px;
  }

  .hero {
    padding: 84px 20px 96px;
  }

  .section {
    padding: 80px 0;
  }

  .section-head {
    margin-bottom: 28px;
  }

  .placeholder {
    padding: 36px 18px;
  }

  .about-points {
    margin-top: 26px;
    gap: 12px;
  }

  .about-point {
    gap: 14px;
  }

  .point-label {
    min-width: 3.8rem;
  }

  .contact-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    padding: 24px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .scroll-hint {
    bottom: 26px;
  }
}

/* ---------- 动效偏好 ---------- */

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

  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .caret {
    animation: none;
    opacity: 1;
  }

  .scroll-hint::after {
    animation: none;
    opacity: .6;
  }
}