/* =============================================================
   蜜桃视界 Site Kit — /assets/site.css
   Creative DNA: 数据叙事型 / 框架导航 / 黑白高对比 + 蜜桃粉锚点
   ============================================================= */

/* ---------- Reset & Base ---------- */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  color: #111111;
  background-color: #f5f5f0;
  background-image:
    linear-gradient(rgba(232, 232, 230, 0.65) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 232, 230, 0.65) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-font-smoothing: antialiased;
}

main {
  min-height: 70vh;
  overflow-x: hidden;
}

img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

::selection {
  background: #ff7b9c;
  color: #111111;
}

:focus-visible {
  outline: 2px solid #ff7b9c;
  outline-offset: 3px;
}

/* ---------- Variables ---------- */

:root {
  --ink: #111111;
  --paper: #f5f5f0;
  --peach: #ff7b9c;
  --yellow: #ffd166;
  --strawberry: #ff4d6d;
  --graphite: #333333;
  --ghost: #e8e8e6;
  --muted: #888888;
  --overlay: rgba(0, 0, 0, 0.85);
  --gradient: linear-gradient(135deg, #ff7b9c 0%, #ffd166 100%);

  --font-heading: "PingFang SC", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --header-h: 72px;
  --container-w: 1280px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;
}

/* ---------- Typography ---------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 200;
  line-height: 1.2;
  color: var(--ink);
}

p {
  margin-bottom: 1em;
}

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

.text-muted {
  color: var(--muted);
  font-size: 0.85rem;
}

/* ---------- Layout ---------- */

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding-left: clamp(16px, 4vw, 48px);
  padding-right: clamp(16px, 4vw, 48px);
}

.section {
  padding: var(--space-7) 0;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--graphite);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--peach);
  flex-shrink: 0;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 200;
  font-size: clamp(2rem, 4vw, 3.75rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.section-title-xl {
  font-size: clamp(2.5rem, 6vw, 6rem);
}

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 30px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.04em;
  white-space: nowrap;
  border: 1px solid var(--graphite);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  border-radius: 0;
  text-decoration: none;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.btn:hover,
.btn:focus-visible {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--peach);
  color: var(--ink);
  border-color: var(--peach);
}

.btn-gradient {
  background: var(--gradient);
  color: var(--ink);
  border: none;
  font-weight: 600;
}

.btn-gradient:hover,
.btn-gradient:focus-visible {
  background: linear-gradient(135deg, var(--strawberry) 0%, var(--peach) 100%);
  color: var(--paper);
}

.btn-outline {
  background: transparent;
  border-color: var(--graphite);
  color: var(--ink);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: transparent;
  border-color: var(--peach);
  color: var(--peach);
}

/* ---------- Card ---------- */

.card {
  background: #ffffff;
  border: 1px solid var(--graphite);
  border-radius: 0;
  padding: 28px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(17, 17, 17, 0.1);
}

.card-accent {
  border-top: 4px solid var(--peach);
}

.card-yellow {
  border-top: 4px solid var(--yellow);
}

/* ---------- Tag ---------- */

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1;
  padding: 6px 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--ghost);
  color: var(--ink);
  border: 1px solid var(--graphite);
}

.tag-peach {
  background: var(--peach);
  border-color: var(--peach);
  color: var(--ink);
}

.tag-yellow {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--ink);
}

.tag-strawberry {
  background: var(--strawberry);
  border-color: var(--strawberry);
  color: #ffffff;
}

.tag-outline {
  background: transparent;
  border-color: var(--graphite);
  color: var(--ink);
}

/* ---------- Divider ---------- */

.divider {
  border: none;
  border-top: 1px solid var(--ghost);
  margin: var(--space-5) 0;
}

.divider-ink {
  border-top-color: var(--graphite);
}

/* ---------- Breadcrumb ---------- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 0;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--ghost);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  list-style: none;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: var(--peach);
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--peach);
}

.breadcrumb li:last-child {
  color: var(--ink);
}

.breadcrumb li:last-child::after {
  display: none;
}

/* ---------- Media Placeholder ---------- */

.media-placeholder {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ghost);
  border: 1px solid var(--graphite);
  aspect-ratio: 4 / 3;
}

.media-placeholder::after {
  content: "MEDIA";
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--muted);
}

.media-square {
  aspect-ratio: 1 / 1;
}

.media-wide {
  aspect-ratio: 16 / 9;
}

.media-portrait {
  aspect-ratio: 3 / 4;
}

/* ---------- Skip Link ---------- */

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 4000;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  padding: 10px 20px;
  border-radius: 0;
  transition: top 0.2s ease;
}

.skip-link:focus-visible {
  top: 8px;
  color: var(--peach);
  outline: none;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--paper);
  border-bottom: 1px solid var(--graphite);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  width: 28px;
  height: 28px;
  display: block;
  background: var(--peach);
  border-radius: 48% 48% 50% 50% / 42% 42% 58% 58%;
}

.brand-mark::before {
  content: "";
  position: absolute;
  top: -4px;
  right: 1px;
  width: 7px;
  height: 11px;
  background: var(--yellow);
  border-radius: 0 100% 60% 40%;
  transform: rotate(18deg);
}

.brand-mark::after {
  content: "";
  position: absolute;
  width: 5px;
  height: 5px;
  background: var(--ink);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 2px rgba(255, 123, 156, 0.35);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.brand-domain {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- Navigation ---------- */

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.5vw, 24px);
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 26px 2px 22px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--peach);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--peach);
}

.nav-link[aria-current="page"] {
  border-bottom-color: var(--peach);
  color: var(--ink);
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--peach);
}

/* ---------- Scroll Progress ---------- */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 3000;
  pointer-events: none;
}

/* ---------- Nav Toggle (mobile) ---------- */

.nav-toggle {
  display: none;
}

/* ---------- Footer ---------- */

.site-footer {
  position: relative;
  z-index: 20;
  background: var(--ink);
  color: var(--paper);
  border-top: 3px solid var(--peach);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 1fr;
  gap: 48px;
  padding-top: var(--space-6);
  padding-bottom: var(--space-5);
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: 0.08em;
  color: var(--peach);
  margin-bottom: 6px;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 16px;
}

.footer-trust {
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--muted);
  border-left: 2px solid var(--peach);
  padding-left: 12px;
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-heading::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--peach);
  flex-shrink: 0;
  display: inline-block;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list a {
  font-size: 0.88rem;
  color: #cfcfc9;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--peach);
  padding-left: 6px;
}

.footer-text {
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--muted);
  margin-bottom: 4px;
}

.footer-text:last-child {
  margin-bottom: 0;
}

.footer-support {
  color: #9a9a94;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  margin-top: 8px;
}

.footer-bottom {
  border-top: 1px solid var(--graphite);
  padding: 20px 0 28px;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px 24px;
}

.footer-copyright,
.footer-icp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
}

.footer-note {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: #555555;
  margin-top: 14px;
}

/* ---------- Responsive ---------- */

@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    border: 1px solid var(--graphite);
    background: transparent;
    padding: 6px 12px;
    flex-shrink: 0;
    cursor: pointer;
  }

  .nav-toggle-line {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--ink);
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .nav-toggle-label {
    font-family: var(--font-mono);
    font-size: 0.55rem;
    letter-spacing: 0.1em;
    color: var(--muted);
    line-height: 1;
    margin-top: 1px;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-line:first-child {
    transform: translateY(3px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-line:last-child {
    transform: translateY(-3px) rotate(-45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-label {
    opacity: 0.6;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(78vw, 340px);
    background: var(--paper);
    border-left: 1px solid var(--graphite);
    box-shadow: -12px 0 32px rgba(0, 0, 0, 0.12);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 250;
    overflow-y: auto;
    padding: 32px 24px;
    align-items: flex-start;
  }

  .site-nav[data-open="true"] {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-item {
    border-bottom: 1px solid var(--ghost);
  }

  .nav-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 4px;
    font-size: 1.2rem;
    border-bottom: none;
    margin-bottom: 0;
  }

  .nav-index {
    font-size: 0.7rem;
  }

  .nav-link[aria-current="page"] {
    border-bottom: none;
    color: var(--peach);
  }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--space-6) 0;
  }

  .card {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 48px;
  }

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

/* ---------- Reduced Motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .site-nav {
    transition: none;
  }

  .nav-toggle-line {
    transition: none;
  }

  .scroll-progress {
    display: none;
  }

  .card,
  .btn,
  .footer-list a {
    transition: none;
  }
}