/* ============================================================
   style/main.css — 远方路 首页样式（index.htm）
   主题：清晨雾色公路 / 消失点远景
   适配：手机 / pad / PC
   ============================================================ */

/* ---------- 设计变量（全站色与字） ---------- */
:root {
  --ink: #1a2228;          /* 正文墨色 */
  --mist: #dce4ea;         /* 晨雾灰蓝 */
  --sky: #b7c5d1;          /* 天际浅蓝灰 */
  --road: #2f383f;         /* 路面深色 */
  --dust: #a68b5b;         /* 里程尘金点缀 */
  --fog: #f3f5f7;          /* 页面浅底（偏冷，非奶油色） */
  --mute: #5c6b76;         /* 次要文字 */
  --display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 68rem;
  --pad: clamp(1.25rem, 4vw, 2.5rem);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--fog);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--dust);
}

a:focus-visible {
  outline: 2px solid var(--dust);
  outline-offset: 3px;
}

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

/* ---------- 顶栏（站点名 + 锚点导航） ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem var(--pad);
  background: linear-gradient(180deg, rgba(243, 245, 247, 0.92), rgba(243, 245, 247, 0));
  backdrop-filter: blur(6px);
}

.brand {
  font-family: var(--display);
  font-size: 1.15rem;
  letter-spacing: 0.12em;
}

.nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.9rem;
  color: var(--mute);
}

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

/* ---------- 首屏 Hero：雾天空 + 消失点公路 ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: end center;
  padding: 6rem var(--pad) 4rem;
  overflow: hidden;
  background: linear-gradient(180deg, #c5d0d9 0%, var(--mist) 42%, #e8ebe8 72%, #d9d4c8 100%);
}

/* 天空渐变层 */
.hero__sky {
  position: absolute;
  inset: 0 0 38%;
  background:
    radial-gradient(ellipse 90% 55% at 50% 100%, rgba(255, 236, 210, 0.55), transparent 70%),
    linear-gradient(180deg, #9eb0bf 0%, transparent 100%);
  pointer-events: none;
}

/* 公路场景容器 */
.hero__road {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 48%;
  perspective: 420px;
  perspective-origin: 50% 0%;
  pointer-events: none;
}

/* 地平线细线 */
.hero__horizon {
  position: absolute;
  top: 0;
  left: 8%;
  right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(26, 34, 40, 0.35), transparent);
}

/* 梯形路面（透视） */
.hero__asphalt {
  position: absolute;
  left: 50%;
  top: 0;
  width: 120%;
  height: 140%;
  transform: translateX(-50%) rotateX(58deg);
  transform-origin: 50% 0;
  background:
    linear-gradient(90deg, #4a3f32 0%, var(--road) 18%, #3a444c 50%, var(--road) 82%, #4a3f32 100%);
  clip-path: polygon(46% 0, 54% 0, 100% 100%, 0 100%);
}

/* 虚线中线：模拟里程向前滚动 */
.hero__dash {
  position: absolute;
  left: 50%;
  top: 2%;
  width: 3px;
  height: 130%;
  transform: translateX(-50%) rotateX(58deg);
  transform-origin: 50% 0;
  background: repeating-linear-gradient(
    180deg,
    rgba(232, 220, 190, 0.95) 0 14px,
    transparent 14px 34px
  );
  animation: dash-roll 2.8s linear infinite;
  opacity: 0.85;
}

@keyframes dash-roll {
  from { background-position: 0 0; }
  to { background-position: 0 48px; }
}

/* 首屏文案 */
.hero__copy {
  position: relative;
  z-index: 2;
  width: min(100%, 36rem);
  text-align: center;
  padding-bottom: 1rem;
}

.hero__title {
  margin: 0 0 0.75rem;
  font-family: var(--display);
  font-size: clamp(2.8rem, 10vw, 5.2rem);
  font-weight: 400;
  letter-spacing: 0.28em;
  text-indent: 0.28em; /* 视觉居中补偿 letter-spacing */
  color: var(--ink);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
  animation: title-in 1.1s ease both;
}

.hero__lead {
  margin: 0;
  font-size: clamp(0.95rem, 2.4vw, 1.1rem);
  color: var(--mute);
  letter-spacing: 0.04em;
  animation: title-in 1.1s ease 0.15s both;
}

@keyframes title-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 「路上」内容区 ---------- */
.strip {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 5.5rem) var(--pad);
}

.strip__title,
.note__title {
  margin: 0 0 1rem;
  font-family: var(--display);
  font-size: clamp(1.5rem, 3.5vw, 1.9rem);
  font-weight: 400;
  letter-spacing: 0.18em;
}

.strip__text {
  margin: 0 0 2.25rem;
  max-width: 38rem;
  color: var(--mute);
  font-size: 1.02rem;
}

/* 黎明 / 午后 / 黄昏 — 纵向里程感，非卡片 */
.mile {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(92, 107, 118, 0.22);
}

.mile li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem 1.5rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid rgba(92, 107, 118, 0.22);
}

.mile__label {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--dust);
  padding-top: 0.2rem;
}

.mile p {
  margin: 0;
  max-width: 36rem;
}

/* ---------- 「手记」收束区 ---------- */
.note {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 0 var(--pad) clamp(3.5rem, 9vw, 6rem);
}

.note__quote {
  margin: 0;
  max-width: 28rem;
  padding: 0 0 0 1.1rem;
  border-left: 2px solid var(--dust);
  font-family: var(--display);
  font-size: clamp(1.15rem, 2.6vw, 1.35rem);
  line-height: 1.85;
  letter-spacing: 0.06em;
  color: var(--ink);
}

/* ---------- 页脚 + 备案 ---------- */
.site-footer {
  padding: 2rem var(--pad) 2.4rem;
  text-align: center;
  background: var(--ink);
  color: rgba(243, 245, 247, 0.72);
  font-size: 0.88rem;
}

.site-footer__brand {
  margin: 0 0 0.55rem;
  font-family: var(--display);
  letter-spacing: 0.2em;
  color: rgba(243, 245, 247, 0.92);
}

.site-footer__beian {
  margin: 0;
}

.site-footer__beian a {
  color: rgba(220, 228, 234, 0.78);
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.site-footer__beian a:hover {
  color: #e8d5b0;
  border-bottom-color: rgba(232, 213, 176, 0.55);
}

/* ---------- 平板 ---------- */
@media (max-width: 900px) {
  .hero {
    min-height: 92svh;
    place-items: end center;
    padding-bottom: 3.25rem;
  }

  .hero__road {
    height: 44%;
  }

  .mile li {
    grid-template-columns: 4.5rem 1fr;
  }
}

/* ---------- 手机 ---------- */
@media (max-width: 640px) {
  .site-header {
    padding-top: 0.7rem;
  }

  .nav {
    gap: 0.9rem;
    font-size: 0.85rem;
  }

  .hero {
    min-height: 88svh;
    padding: 5.5rem var(--pad) 2.75rem;
  }

  .hero__title {
    letter-spacing: 0.18em;
    text-indent: 0.18em;
  }

  .hero__lead {
    text-align: left;
  }

  .mile li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .note__quote {
    padding-left: 0.85rem;
  }
}

/* ---------- 减弱动效（无障碍） ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero__dash,
  .hero__title,
  .hero__lead {
    animation: none;
  }
}