/* 易小钱科技 · 备案静态站 */
:root {
  --bg-deep: #061820;
  --bg-mid: #0a3a45;
  --teal: #1aa6a8;
  --teal-bright: #2ec4b6;
  --cyan: #7ee8e0;
  --ink: #0f1c22;
  --muted: #5a6f78;
  --line: rgba(15, 28, 34, 0.12);
  --surface: #f4f8f9;
  --white: #ffffff;
  --max: 1080px;
  --font-display: "Sora", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* —— 顶栏 —— */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  transition: background 0.25s ease, box-shadow 0.25s ease, backdrop-filter 0.25s ease;
}

.site-header.is-scrolled {
  background: rgba(6, 24, 32, 0.88);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--white);
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  color: var(--white);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* —— 首屏 —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  padding: 0 0 5.5rem;
  color: var(--white);
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(46, 196, 182, 0.28), transparent 55%),
    radial-gradient(ellipse 60% 50% at 15% 80%, rgba(26, 166, 168, 0.35), transparent 50%),
    linear-gradient(155deg, var(--bg-deep) 0%, var(--bg-mid) 48%, #0d5c5e 100%);
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(126, 232, 224, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 232, 224, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.55), transparent 90%);
  pointer-events: none;
}

.hero__code {
  position: absolute;
  right: -2%;
  top: 18%;
  width: min(42vw, 420px);
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: clamp(0.65rem, 1.2vw, 0.85rem);
  line-height: 1.8;
  color: rgba(126, 232, 224, 0.22);
  white-space: pre;
  pointer-events: none;
  user-select: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  animation: hero-in 0.9s ease both;
}

@keyframes hero-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__brand {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 7.5vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: 0.06em;
}

.hero__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 2.6vw, 1.55rem);
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.92);
}

.hero__lead {
  margin: 0 0 2rem;
  max-width: 28em;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.68);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.6rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--bg-deep);
  background: var(--cyan);
  border: 0;
  border-radius: 2px;
  transition: background 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  background: var(--teal-bright);
  transform: translateY(-1px);
}

/* —— 通用区块 —— */
.section {
  padding: 5rem 0;
}

.section--alt {
  background: var(--surface);
}

.section__label {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
}

.section__title {
  margin: 0 0 2.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* —— 业务 —— */
.services {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.service {
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.service:nth-child(odd) {
  padding-right: 2rem;
  border-right: 1px solid var(--line);
}

.service:nth-child(even) {
  padding-left: 2rem;
}

.service__name {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}

.service__desc {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* —— 关于 / 联系 —— */
.prose {
  max-width: 42rem;
}

.prose p {
  margin: 0 0 1.1rem;
  color: var(--muted);
}

.prose p:last-child {
  margin-bottom: 0;
}

.meta-list {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.meta-list li {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.75rem;
  font-size: 0.95rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.meta-list span {
  color: var(--muted);
}

.meta-list strong {
  font-weight: 500;
  word-break: break-all;
}

.contact-block h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
}

.contact-block p {
  margin: 0;
  color: var(--muted);
  max-width: 28rem;
}

/* —— 页脚 —— */
.site-footer {
  padding: 2.5rem 0 2rem;
  background: var(--bg-deep);
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.88rem;
}

.site-footer__grid {
  display: grid;
  gap: 0.55rem;
}

.site-footer a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-footer__brand {
  margin-bottom: 0.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--white);
  font-size: 1rem;
}

/* —— 响应式 —— */
@media (max-width: 720px) {
  .nav {
    display: none;
    position: absolute;
    top: 4rem;
    right: 1.25rem;
    left: 1.25rem;
    flex-direction: column;
    gap: 0;
    background: rgba(6, 24, 32, 0.96);
    padding: 0.75rem;
    border-radius: 4px;
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 0.75rem 0.85rem;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    align-items: center;
    padding: 6rem 0 4rem;
  }

  .hero__code {
    display: none;
  }

  .services {
    grid-template-columns: 1fr;
  }

  .service:nth-child(odd),
  .service:nth-child(even) {
    padding-right: 0;
    padding-left: 0;
    border-right: 0;
  }

  .meta-list li {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

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

  .hero__content {
    animation: none;
  }
}