/* ==========================================================================
   street-weisiren.com.cn — 共享样式表 /assets/site.css
   隐喻：澳门街巷路牌 · 葡式碎石路 · 晨光石黄
   ========================================================================== */

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

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

html,
body { margin: 0; padding: 0; }

h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, figcaption, blockquote, dl, dd, address {
  margin: 0;
  padding: 0;
}

ul[class],
ol[class] { list-style: none; }

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

button { font: inherit; color: inherit; background: none; border: 0; }

[hidden] { display: none !important; }

main { display: block; }

/* ---------- 变量 ---------- */
:root {
  --stone: #F7EFD8;
  --gold: #E8C97A;
  --deep: #173F3A;
  --celadon: #3F7C6E;
  --brick: #8F3B2E;
  --sea: #255A78;
  --indigo: #2B2A4A;
  --paper: #FFFDF6;
  --ink: #1C1B18;
  --warm: #6F6A5E;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --wrap: 1180px;
  --gutter: clamp(18px, 4vw, 56px);
  --ease: cubic-bezier(.22, .7, .3, 1);
  --shadow: 0 1px 0 rgba(23, 63, 58, .08), 0 14px 30px -24px rgba(23, 63, 58, .7);
}

/* ---------- 基础排版 ---------- */
body {
  background-color: var(--stone);
  background-image:
    repeating-linear-gradient(45deg, rgba(23, 63, 58, .034) 0 1px, transparent 1px 15px),
    repeating-linear-gradient(-45deg, rgba(23, 63, 58, .034) 0 1px, transparent 1px 15px);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(16px, 0.42vw + 15px, 17.5px);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--deep);
}

h1 { font-size: clamp(30px, 5.4vw, 58px); }
h2 { font-size: clamp(22px, 3vw, 32px); }
h3 { font-size: clamp(17px, 1.6vw, 20px); letter-spacing: 0; }
h4 { font-size: 16px; }

p { max-width: 68ch; }

a {
  color: var(--sea);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

strong, b { font-weight: 700; }

:focus-visible {
  outline: 3px solid var(--sea);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  display: inline-block;
  padding: 10px 18px;
  background: var(--deep);
  color: var(--stone);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  text-decoration: none;
  transition: top .18s var(--ease);
}

.skip-link:focus { top: 12px; color: var(--gold); }

/* ---------- 容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* ---------- 头部 ---------- */
.site-header {
  position: relative;
  padding-top: 6px;
  background: linear-gradient(180deg, #FCF6E6 0%, var(--stone) 100%);
  border-bottom: 2px solid var(--deep);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: linear-gradient(90deg,
    var(--brick) 0 16%,
    var(--gold) 16% 38%,
    var(--celadon) 38% 62%,
    var(--sea) 62% 82%,
    var(--indigo) 82% 100%);
}

.masthead {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(14px, 2vw, 22px) var(--gutter) clamp(10px, 1.4vw, 16px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
}

.masthead__signature {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  line-height: 1.6;
  color: var(--celadon);
  border-left: 3px solid var(--gold);
  padding-left: 10px;
  max-width: none;
}

.masthead__latin {
  display: block;
  font-size: 9.5px;
  letter-spacing: .26em;
  color: var(--warm);
  margin-top: 2px;
}

.masthead__brand {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.9vw, 42px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--deep);
  text-decoration: none;
  text-align: center;
  padding: clamp(6px, 1vw, 10px) clamp(8px, 2vw, 22px);
  border-top: 2px solid var(--deep);
  border-bottom: 2px solid var(--deep);
  white-space: nowrap;
}

.masthead__brand:hover { color: var(--brick); }

.masthead__contact {
  text-align: right;
  line-height: 1.6;
  color: var(--deep);
}

.masthead__contact-item {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .02em;
  word-break: break-all;
}

.masthead__contact-note {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--warm);
  margin-top: 2px;
}

/* ---------- 导航色带 ---------- */
.nav-bar {
  background-color: var(--gold);
  background-image: repeating-linear-gradient(90deg, rgba(23, 63, 58, .07) 0 2px, transparent 2px 22px);
  border-top: 2px solid var(--deep);
}

.nav-bar__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 52px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  background: var(--deep);
  color: var(--stone);
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background .18s var(--ease), color .18s var(--ease);
}

.nav-toggle[aria-expanded="true"] {
  background: var(--brick);
  color: var(--paper);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 12px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform .18s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__text {
  font-size: 13px;
  letter-spacing: .14em;
}

.site-nav { flex: 1 1 auto; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(2px, 1vw, 14px);
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 13px 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--deep);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.site-nav__link:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--celadon);
}

.site-nav__link[aria-current="page"] {
  color: var(--deep);
  border-bottom-color: var(--sea);
}

.site-nav__link[aria-current="page"] .site-nav__num { color: var(--brick); }

.site-nav__link[aria-current="page"] .site-nav__num::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 5px;
  vertical-align: 1px;
  background: var(--brick);
}

.nav-cta {
  flex: 0 0 auto;
  padding: 9px 15px;
  background: var(--brick);
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: .04em;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: background .18s var(--ease);
}

.nav-cta:hover { background: var(--indigo); color: var(--paper); }

.nav-cta:focus-visible { outline-offset: -4px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--deep);
  background-image:
    repeating-linear-gradient(45deg, rgba(247, 239, 216, .03) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(-45deg, rgba(247, 239, 216, .03) 0 1px, transparent 1px 16px);
  color: var(--stone);
}

.footer-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px var(--gutter);
  background: var(--gold);
  color: var(--deep);
  border-bottom: 2px solid var(--deep);
}

.footer-band__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--deep);
  max-width: none;
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  background: var(--deep);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  transition: background .18s var(--ease), color .18s var(--ease);
}

.to-top:hover { background: var(--brick); color: var(--paper); }

.to-top__arrow { font-size: 12px; line-height: 1; }

.footer-grid {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 56px) var(--gutter) clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 44px);
  border-top: 1px solid rgba(232, 201, 122, .26);
}

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

.footer-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: none;
}

.footer-icp {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(247, 239, 216, .62);
  max-width: none;
}

.footer-heading {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--gold);
}

.footer-list {
  display: grid;
  gap: 9px;
  font-size: 14px;
}

.footer-list a {
  color: rgba(247, 239, 216, .84);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-list a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.footer-list--plain li {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(247, 239, 216, .72);
  word-break: break-all;
}

.footer-note {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px var(--gutter) clamp(26px, 4vw, 44px);
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(247, 239, 216, .56);
  border-top: 1px solid rgba(232, 201, 122, .18);
  max-width: none;
}

.footer-copy {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: rgba(247, 239, 216, .42);
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .02em;
  text-decoration: none;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: background .18s var(--ease), color .18s var(--ease);
}

.btn:focus-visible { outline-offset: -4px; }

.btn--brick { background: var(--brick); color: var(--paper); }
.btn--brick:hover { background: var(--indigo); color: var(--paper); }

.btn--deep { background: var(--deep); color: var(--gold); }
.btn--deep:hover { background: var(--celadon); color: var(--paper); }

.btn--ghost {
  background: transparent;
  color: var(--deep);
  box-shadow: inset 0 0 0 2px var(--deep);
}
.btn--ghost:hover { background: var(--deep); color: var(--gold); }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px var(--gutter) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--warm);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

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

.breadcrumbs li::after {
  content: "/";
  color: rgba(23, 63, 58, .3);
}

.breadcrumbs li:last-child::after { content: ""; }

.breadcrumbs a {
  color: var(--sea);
  text-decoration: none;
}

.breadcrumbs a:hover { color: var(--brick); }

/* ---------- 面板 ---------- */
.panel {
  background: var(--paper);
  border: 1px solid rgba(23, 63, 58, .14);
  padding: clamp(18px, 2.6vw, 28px);
  box-shadow: var(--shadow);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.panel > * + * { margin-top: 12px; }

.panel--gold {
  background: var(--gold);
  border-color: rgba(23, 63, 58, .22);
  color: var(--deep);
}

.panel--deep {
  background: var(--deep);
  border-color: transparent;
  color: var(--stone);
}

.panel--deep h2,
.panel--deep h3 { color: var(--paper); }

.panel--indigo {
  background: var(--indigo);
  border-color: transparent;
  color: var(--paper);
}

.panel--indigo h2,
.panel--indigo h3 { color: var(--gold); }

/* ---------- 眉标 / 标签 / 旁注 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--celadon);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--brick);
}

.tag {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--celadon);
  background: rgba(63, 124, 110, .12);
  border: 1px solid rgba(63, 124, 110, .32);
}

.note {
  padding-left: 12px;
  border-left: 3px solid var(--gold);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--warm);
}

/* ---------- 章节头与分隔 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.section-head__num {
  padding: 2px 9px;
  background: var(--gold);
  color: var(--brick);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
}

.rule {
  height: 0;
  margin: clamp(24px, 4vw, 44px) 0;
  border: 0;
  border-top: 1.5px solid rgba(23, 63, 58, .18);
}

/* ---------- 等宽清单 ---------- */
.ledger {
  display: grid;
  gap: 0;
  border-top: 1.5px solid rgba(23, 63, 58, .2);
}

.ledger__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: 13px 2px;
  border-bottom: 1px solid rgba(23, 63, 58, .14);
}

.ledger__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--celadon);
}

.ledger__val {
  color: var(--ink);
  font-size: 15.5px;
}

.ledger__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--warm);
  text-align: right;
}

/* ---------- 主题筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.filter-btn {
  padding: 7px 13px;
  background: var(--paper);
  color: var(--deep);
  border: 1.5px solid rgba(23, 63, 58, .28);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 0 100%);
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.filter-btn:hover {
  border-color: var(--sea);
  color: var(--sea);
}

.filter-btn[aria-pressed="true"],
.filter-btn.is-active {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--gold);
}

.filter-btn:focus-visible { outline-offset: -4px; }

/* ---------- 图片容器 ---------- */
.figure {
  margin: 0;
  position: relative;
}

.figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: var(--ratio, 4 / 3);
  background: linear-gradient(135deg, var(--gold) 0%, var(--celadon) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(200deg, rgba(23, 63, 58, 0) 48%, rgba(23, 63, 58, .32) 100%);
}

.figure--tall .figure__media { --ratio: 3 / 4; }
.figure--wide .figure__media { --ratio: 21 / 9; }
.figure--square .figure__media { --ratio: 1 / 1; }

.figure__cap {
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--warm);
}

/* ---------- 滚动显现 ---------- */
.reveal {
  opacity: 0;
  transform: translate(10px, 16px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.reveal.is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .masthead {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: 12px;
  }

  .masthead__signature {
    border-left: 0;
    padding-left: 0;
    text-align: center;
  }

  .masthead__latin { display: inline-block; margin-left: 8px; margin-top: 0; }

  .masthead__contact {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px 14px;
    text-align: center;
  }

  .masthead__contact-item { display: inline-block; }

  .nav-bar__inner {
    flex-wrap: wrap;
    gap: 10px;
    padding-block: 10px;
  }

  .nav-toggle { display: inline-flex; }

  .nav-cta { margin-left: auto; }

  .site-nav {
    flex: 1 0 100%;
    order: 3;
    display: none;
    padding-top: 4px;
    border-top: 1px solid rgba(23, 63, 58, .22);
    margin-top: 2px;
  }

  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
  }

  .site-nav__link {
    width: 100%;
    padding: 12px 8px;
    border-bottom: 1px solid rgba(23, 63, 58, .16);
  }

  .site-nav__link[aria-current="page"] {
    border-bottom-color: rgba(23, 63, 58, .16);
    background: rgba(255, 253, 246, .55);
    box-shadow: inset 3px 0 0 var(--brick);
  }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .masthead__brand {
    white-space: normal;
    font-size: clamp(20px, 8vw, 30px);
    letter-spacing: -0.02em;
  }

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

  .footer-band { justify-content: center; }

  .ledger__row {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas: "key key" "val meta";
    row-gap: 4px;
  }

  .ledger__key { grid-area: key; }
  .ledger__val { grid-area: val; }
  .ledger__meta { grid-area: meta; }
}

/* ---------- 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}