/* ============================================================
   星舵助手 · 全站样式
   设计语言：极简 editorial · 浅色底 · 大留白 · 电光蓝强调
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --color-bg:        #FAFAFA;
  --color-surface:   #FFFFFF;
  --color-ink:       #0A0A0A;
  --color-ink-soft:  #4A4A4A;
  --color-mute:      #8A8A8A;
  --color-line:      #E8E8E8;
  --color-accent:    #0066FF;
  --color-accent-soft: #EAF1FF;
  --color-dark:      #0A0A0A;
  --color-success:   #10B981;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.05);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);

  --container: 1180px;
  --gutter: clamp(20px, 5vw, 48px);

  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
               Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--color-accent); }
button { font: inherit; cursor: pointer; }

/* ---------- 排版 ---------- */
h1, h2, h3, h4 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
h1 { font-size: clamp(40px, 6vw, 68px); line-height: 1.05; letter-spacing: -0.035em; }
h2 { font-size: clamp(28px, 3.5vw, 42px); line-height: 1.15; }
h3 { font-size: clamp(20px, 2vw, 24px); line-height: 1.3; }
h4 { font-size: 18px; line-height: 1.4; }
p  { margin: 0 0 1em; color: var(--color-ink-soft); }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}
.lead {
  font-size: clamp(17px, 1.6vw, 19px);
  color: var(--color-ink-soft);
  max-width: 640px;
  line-height: 1.65;
}

/* ---------- 布局工具 ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
.section {
  padding: clamp(64px, 9vw, 120px) 0;
}
.section--dark {
  background: var(--color-dark);
  color: #FAFAFA;
}
.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 { color: #FFFFFF; }
.section--dark p { color: #B8B8B8; }

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250,250,250,0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-line);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.nav__brand-mark {
  width: 28px; height: 28px;
  background: var(--color-ink);
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #FFF;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.02em;
}
.nav__menu {
  display: flex;
  gap: 32px;
  align-items: center;
}
.nav__link {
  font-size: 14.5px;
  color: var(--color-ink-soft);
  position: relative;
  padding: 4px 0;
}
.nav__link.active,
.nav__link:hover { color: var(--color-ink); }
.nav__link.active::after {
  content: "";
  position: absolute;
  inset: auto 0 -22px 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}
.nav__toggle {
  display: none;
  width: 40px; height: 40px;
  border: none;
  background: transparent;
  padding: 0;
  color: var(--color-ink);
}

@media (max-width: 768px) {
  .nav__toggle { display: grid; place-items: center; }
  .nav__menu {
    position: absolute;
    inset: 64px 0 auto 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
    padding: 8px 0;
    display: none;
  }
  .nav__menu.open { display: flex; }
  .nav__menu .nav__link {
    width: 100%;
    padding: 14px var(--gutter);
    border-bottom: 1px solid var(--color-line);
  }
  .nav__menu .nav__link:last-child { border-bottom: 0; }
  .nav__menu .nav__link.active::after { display: none; }
  .nav__menu .nav__link.active { color: var(--color-accent); }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: all .15s ease;
}
.btn--primary {
  background: var(--color-ink);
  color: #FFF;
}
.btn--primary:hover {
  background: var(--color-accent);
  color: #FFF;
  transform: translateY(-1px);
}
.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn--ghost:hover { border-color: var(--color-ink); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all .2s ease;
}
.card:hover {
  border-color: var(--color-ink);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.card__icon {
  width: 44px; height: 44px;
  display: grid;
  place-items: center;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: 12px;
  margin-bottom: 18px;
}
.card__title {
  margin-bottom: 10px;
  font-size: 17px;
  font-weight: 600;
}
.card__desc {
  font-size: 14.5px;
  color: var(--color-ink-soft);
  margin: 0;
  line-height: 1.6;
}
.section--dark .card {
  background: #1A1A1A;
  border-color: #2A2A2A;
}
.section--dark .card__desc { color: #B8B8B8; }

/* ---------- 统计 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  margin-top: 48px;
}
.stat {
  padding: 28px 20px;
  border-left: 1px solid var(--color-line);
}
.stat:first-child { border-left: 0; }
.stat__num {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--color-ink);
  line-height: 1;
}
.stat__num sup { font-size: 0.45em; color: var(--color-accent); margin-left: 2px; }
.stat__label {
  font-size: 13px;
  color: var(--color-mute);
  margin-top: 8px;
  letter-spacing: 0.02em;
}
.section--dark .stats { border-color: #2A2A2A; }
.section--dark .stat { border-color: #2A2A2A; }
.section--dark .stat__num { color: #FFF; }

/* ---------- Hero ---------- */
.hero {
  padding: clamp(80px, 12vw, 160px) 0 clamp(64px, 8vw, 100px);
  position: relative;
  overflow: hidden;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: 24px;
}
.hero__badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 4px rgba(16,185,129,0.15);
}
.hero__title {
  max-width: 880px;
  margin-bottom: 24px;
}
.hero__title em {
  font-style: normal;
  background: linear-gradient(180deg, transparent 60%, rgba(0,102,255,0.18) 60%);
  padding: 0 4px;
}
.hero__sub {
  max-width: 580px;
  font-size: clamp(17px, 1.8vw, 20px);
  color: var(--color-ink-soft);
  line-height: 1.55;
  margin-bottom: 36px;
}
.hero__cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero__visual {
  margin-top: 72px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 32px;
  overflow: hidden;
  position: relative;
}
.hero__visual::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 60%; height: 200%;
  background: radial-gradient(circle, rgba(0,102,255,0.10), transparent 65%);
  pointer-events: none;
}

/* ---------- 数据演示面板 ---------- */
.panel {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
}
.panel__main,
.panel__side {
  background: #FFF;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 22px;
}
.panel__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-line);
}
.panel__head h4 {
  font-size: 14px;
  margin: 0;
  font-weight: 600;
}
.panel__head span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-mute);
}
.bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 140px;
}
.bars__bar {
  flex: 1;
  background: linear-gradient(180deg, var(--color-accent), rgba(0,102,255,0.55));
  border-radius: 4px 4px 0 0;
  min-height: 8px;
}
.bars__bar.muted { background: linear-gradient(180deg, #BFD4FF, #DCE7FF); }

.legend-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-mute);
  margin-top: 12px;
}

.kv {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-line);
  font-size: 13.5px;
}
.kv:last-child { border-bottom: 0; }
.kv__k { color: var(--color-mute); }
.kv__v { color: var(--color-ink); font-weight: 500; font-family: var(--font-mono); }

@media (max-width: 720px) {
  .panel { grid-template-columns: 1fr; }
}

/* ---------- 章节头 ---------- */
.section__head {
  max-width: 720px;
  margin-bottom: 56px;
}
.section__head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

/* ---------- 时间线 ---------- */
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: "";
  position: absolute;
  inset: 6px auto 0 8px;
  width: 1px;
  background: var(--color-line);
}
.timeline__item {
  position: relative;
  padding-bottom: 28px;
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 8px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-ink);
}
.timeline__item.is-active::before {
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}
.timeline__date {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-mute);
  margin-bottom: 4px;
}
.timeline__title { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.timeline__desc { font-size: 14px; color: var(--color-ink-soft); margin: 0; }

/* ---------- 项目列表（详情页）---------- */
.proj-list {
  display: grid;
  gap: 20px;
}
.proj {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px;
  display: grid;
  grid-template-columns: 200px 1fr auto;
  gap: 28px;
  align-items: start;
  transition: all .2s ease;
}
.proj:hover { border-color: var(--color-ink); box-shadow: var(--shadow-md); }
.proj__meta {
  border-right: 1px solid var(--color-line);
  padding-right: 24px;
}
.proj__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.proj__name {
  font-size: 19px;
  font-weight: 600;
  margin-bottom: 6px;
}
.proj__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-mute);
}
.proj__desc {
  font-size: 14.5px;
  color: var(--color-ink-soft);
  margin: 0 0 14px;
  line-height: 1.65;
}
.proj__bullets {
  margin: 0;
  padding-left: 18px;
  font-size: 13.5px;
  color: var(--color-ink-soft);
}
.proj__bullets li { margin-bottom: 4px; }
.proj__arrow {
  align-self: center;
  color: var(--color-mute);
  font-family: var(--font-mono);
  font-size: 18px;
  transition: all .15s ease;
}
.proj:hover .proj__arrow { color: var(--color-accent); transform: translateX(4px); }

@media (max-width: 880px) {
  .proj { grid-template-columns: 1fr; }
  .proj__meta { border-right: 0; border-bottom: 1px solid var(--color-line); padding: 0 0 16px; }
  .proj__arrow { display: none; }
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  color: var(--color-ink-soft);
  margin: 4px 4px 0 0;
}
.section--dark .tag {
  background: #1A1A1A;
  border-color: #2A2A2A;
  color: #B8B8B8;
}

/* ---------- 手机截图展示 ---------- */
.phones {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin: 0 auto;
  align-items: end;
}
.phones__item {
  border-radius: 32px;
  overflow: hidden;
  box-shadow:
    0 30px 60px -20px rgba(10,10,10,0.35),
    0 8px 16px rgba(10,10,10,0.12);
  background: #050507;
  transition: transform .35s ease;
}
.phones__item:hover { transform: translateY(-6px); }
.phones__item img {
  width: 100%;
  height: auto;
  max-height: 580px;
  display: block;
  object-fit: contain;
}
.phones__cap {
  text-align: center;
  font-size: 13px;
  color: var(--color-mute);
  margin-top: 16px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
@media (max-width: 720px) {
  .phones { grid-template-columns: 1fr; max-width: 320px; gap: 36px; }
}

/* ---------- Gallery ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 48px;
}
.gallery__item { text-align: center; }
.gallery__img {
  width: 100%;
  border-radius: 22px;
  overflow: hidden;
  box-shadow:
    0 18px 40px -12px rgba(10,10,10,0.22),
    0 4px 8px rgba(10,10,10,0.06);
  background: #050507;
  margin-bottom: 12px;
  transition: transform .25s ease;
}
.gallery__item:hover .gallery__img { transform: translateY(-4px); }
.gallery__img img {
  width: 100%;
  height: auto;
  max-height: 460px;
  display: block;
  object-fit: contain;
}
.gallery__name {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--color-ink);
}
@media (max-width: 1024px) { .gallery { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px)  { .gallery { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 引用 ---------- */
.quote {
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  font-weight: 500;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}
.quote::before { content: "“"; display: block; font-size: 56px; color: var(--color-accent); line-height: 0.3; margin-bottom: 24px; }
.quote__cite { display: block; margin-top: 24px; font-size: 13px; font-weight: 400; color: var(--color-mute); letter-spacing: 0.04em; }
.section--dark .quote { color: #FAFAFA; }
.section--dark .quote__cite { color: #888; }

/* ---------- 表单 / 联系 ---------- */
.contact {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact__form { display: grid; gap: 14px; }
.field { display: grid; gap: 6px; }
.field label { font-size: 13px; color: var(--color-ink-soft); }
.field input,
.field textarea {
  font: inherit;
  padding: 12px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink);
  transition: border-color .15s ease;
  width: 100%;
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}
.field textarea { min-height: 120px; resize: vertical; }
@media (max-width: 720px) {
  .contact { grid-template-columns: 1fr; gap: 28px; }
}

/* ---------- 页脚 ---------- */
.foot {
  background: var(--color-dark);
  color: #B8B8B8;
  padding: 56px 0 32px;
}
.foot__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}
.foot h5 {
  font-size: 13px;
  font-weight: 500;
  color: #FFF;
  margin: 0 0 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin-bottom: 8px; font-size: 13.5px; }
.foot a:hover { color: #FFF; }
.foot__brand { max-width: 320px; }
.foot__brand p { font-size: 13.5px; color: #888; margin-top: 12px; }
.foot__bottom {
  border-top: 1px solid #2A2A2A;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 12.5px;
  color: #666;
}
/* 备案号：工信部要求底部可见可点，颜色需高于 #666 以保证可读 */
.foot__bottom a,
.foot li a[href*="beian.miit.gov.cn"] {
  color: #9A9A9A;
}
.foot__bottom a:hover,
.foot li a[href*="beian.miit.gov.cn"]:hover {
  color: #FFF;
}
@media (max-width: 720px) {
  .foot__grid { grid-template-columns: 1fr 1fr; }
  .foot__brand { grid-column: 1 / -1; }
  .foot__bottom { flex-direction: column; gap: 8px; }
}

/* ---------- 工具类 ---------- */
.muted { color: var(--color-mute); }
.mono { font-family: var(--font-mono); }
.center { text-align: center; }
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.flex { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* ---------- 滚动入场动画 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity .6s ease, transform .6s ease;
  }
  .reveal.in { opacity: 1; transform: none; }
}