/* =====================================================
   下注中国 Site Kit / assets/site.css
   黑金研究板 · 非对称侧栏布局
   ===================================================== */

/* ---------- Reset ---------- */

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

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

:root {
  /* 品牌色板 */
  --color-ink: #0a0a0a;
  --color-charcoal: #1a1a1a;
  --color-gold: #c9a227;
  --color-gold-bright: #f5d76e;
  --color-crimson: #8b0000;
  --color-deep-blue: #0f2027;
  --color-cream: #f5f5f0;
  --color-grey-gold: #b0b0b0;

  /* 字体系统 */
  --font-heading: "Source Han Serif SC", "Noto Serif SC", "Songti SC", SimSun, serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "JetBrains Mono", "SF Mono", "Cascadia Mono", Consolas, monospace;

  --fz-h1: clamp(2rem, 5vw, 3.5rem);
  --fz-h2: clamp(1.5rem, 3vw, 2.5rem);
  --fz-h3: clamp(1.2rem, 2vw, 1.8rem);
  --fz-body: 1rem;
  --fz-small: 0.875rem;
  --fz-tiny: 0.75rem;

  /* 布局 */
  --header-width: 280px;
  --container-max: 1280px;
  --container-pad: clamp(1rem, 3vw, 2rem);
  --content-offset: calc(var(--header-width) + 4rem);

  /* 间距 */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-8: 3rem;
  --sp-10: 5rem;

  /* 效果 */
  --shadow-soft: 0 12px 48px rgba(0, 0, 0, 0.4);
  --shadow-gold: 0 0 24px rgba(201, 162, 39, 0.15);
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;

  /* 切换 */
  --t-fast: 0.2s ease;
  --t-base: 0.35s ease;

  /* 层级 */
  --z-header: 100;
  --z-nav: 110;
  --z-skip: 1000;
  --z-progress: 200;
}

/* ---------- Base ---------- */

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--fz-body);
  line-height: 1.75;
  color: var(--color-cream);
  background: var(--color-ink);
  background-image:
    radial-gradient(circle at 12% 20%, rgba(15, 32, 39, 0.4), transparent 32%),
    radial-gradient(circle at 88% 82%, rgba(139, 0, 0, 0.08), transparent 36%);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-cream);
}

h1 { font-size: var(--fz-h1); letter-spacing: 0.02em; }
h2 { font-size: var(--fz-h2); letter-spacing: 0.03em; }
h3 { font-size: var(--fz-h3); }

p {
  margin-bottom: var(--sp-4);
}

a {
  color: var(--color-gold);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color var(--t-fast);
}

a:hover {
  color: var(--color-gold-bright);
}

ul,
ol {
  list-style: none;
}

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

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

/* ---------- Utilities ---------- */

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--sp-5) var(--sp-6);
}

.col-12 { grid-column: span 12; }
.col-8 { grid-column: span 8; }
.col-7 { grid-column: span 7; }
.col-6 { grid-column: span 6; }
.col-5 { grid-column: span 5; }
.col-4 { grid-column: span 4; }
.col-3 { grid-column: span 3; }

@media (max-width: 767px) {
  .col-8,
  .col-7,
  .col-6,
  .col-5,
  .col-4,
  .col-3 {
    grid-column: span 12;
  }
}

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

.skip-link {
  position: fixed;
  top: var(--sp-3);
  left: var(--sp-3);
  z-index: var(--z-skip);
  padding: var(--sp-3) var(--sp-5);
  background: var(--color-gold);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--fz-small);
  text-decoration: none;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
  transform: translateY(-300%);
  transition: transform var(--t-fast);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--color-ink);
}

/* ---------- Header (Side Rail) ---------- */

.site-header {
  background: var(--color-ink);
  border-bottom: 1px solid rgba(201, 162, 39, 0.15);
  z-index: var(--z-header);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding: var(--sp-4) var(--container-pad);
  max-width: var(--container-max);
  margin-inline: auto;
}

/* 品牌 */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  color: var(--color-cream);
}

.site-brand:hover {
  color: var(--color-gold-bright);
}

.site-brand__mark {
  position: relative;
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid rgba(201, 162, 39, 0.5);
  background:
    linear-gradient(45deg, transparent 25%, rgba(201, 162, 39, 0.22) 25%, rgba(201, 162, 39, 0.22) 50%, transparent 50%, transparent 75%, rgba(201, 162, 39, 0.22) 75%, transparent 75%) 0 0 / 10px 10px,
    linear-gradient(160deg, var(--color-charcoal), var(--color-deep-blue));
  box-shadow: inset 0 0 14px rgba(201, 162, 39, 0.12);
}

.site-brand__chip {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16px;
  height: 16px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 2px dashed var(--color-gold);
  background: radial-gradient(circle, rgba(201, 162, 39, 0.8) 0%, transparent 62%);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-brand__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-cream);
}

.site-brand__subtitle {
  font-family: var(--font-data);
  font-size: 0.7rem;
  color: var(--color-grey-gold);
  letter-spacing: 0.05em;
  margin-top: 2px;
}

/* 汉堡按钮 */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(201, 162, 39, 0.25);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.nav-toggle:hover {
  border-color: var(--color-gold);
  background: rgba(201, 162, 39, 0.06);
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-gold);
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--t-fast);
}

.site-header[data-open] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.site-header[data-open] .nav-toggle__bar:first-of-type {
  transform: translateY(7px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bar:last-of-type {
  transform: translateY(-7px) rotate(-45deg);
}

/* 导航 */
.site-nav {
  flex-basis: 100%;
  display: none;
  padding-top: var(--sp-5);
}

.site-header[data-open] .site-nav {
  display: block;
  animation: nav-slide-in 0.3s ease;
}

.site-nav__eyebrow {
  font-family: var(--font-data);
  font-size: var(--fz-tiny);
  letter-spacing: 0.3em;
  color: var(--color-grey-gold);
  text-transform: uppercase;
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-3);
  border-bottom: 1px dashed rgba(201, 162, 39, 0.3);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
}

.site-nav__item + .site-nav__item {
  margin-top: 2px;
}

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  color: var(--color-grey-gold);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}

.site-nav__link:hover {
  color: var(--color-cream);
  background: rgba(201, 162, 39, 0.06);
  border-left-color: var(--color-gold);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-gold-bright);
  background: linear-gradient(90deg, rgba(201, 162, 39, 0.14), transparent);
  border-left-color: var(--color-gold);
}

.site-nav__index {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--color-gold);
  opacity: 0.75;
  letter-spacing: 0.05em;
}

.site-nav__label {
  letter-spacing: 0.05em;
}

.site-nav__meta {
  margin-top: auto;
  padding-top: var(--sp-5);
  border-top: 1px dashed rgba(201, 162, 39, 0.3);
  font-family: var(--font-data);
  font-size: var(--fz-tiny);
  line-height: 1.8;
  letter-spacing: 0.08em;
  color: var(--color-grey-gold);
  text-align: center;
  margin-bottom: 0;
}

@keyframes nav-slide-in {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.site-footer {
  margin-top: auto;
  background:
    radial-gradient(circle at 85% 100%, rgba(15, 32, 39, 0.5), transparent 42%),
    var(--color-ink);
  border-top: 1px solid rgba(201, 162, 39, 0.14);
}

.site-footer__accent {
  height: 4px;
  background: repeating-linear-gradient(
    90deg,
    var(--color-gold) 0,
    var(--color-gold) 48px,
    transparent 48px,
    transparent 96px
  );
  opacity: 0.32;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
  padding-top: var(--sp-8);
  padding-bottom: var(--sp-6);
}

.site-footer__panel h2 {
  font-size: 1.05rem;
  color: var(--color-gold);
  margin-bottom: var(--sp-4);
  letter-spacing: 0.06em;
}

.site-footer__gutter {
  font-family: var(--font-data);
  font-size: 0.7rem;
  color: var(--color-grey-gold);
  opacity: 0.7;
  margin-right: var(--sp-2);
}

.site-footer__list li {
  font-size: var(--fz-small);
  line-height: 1.7;
  color: var(--color-grey-gold);
}

.site-footer__list li + li {
  margin-top: var(--sp-2);
}

.site-footer__list a {
  color: var(--color-grey-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.site-footer__list a:hover {
  color: var(--color-gold-bright);
  border-bottom-color: var(--color-gold);
}

.site-footer__about {
  font-size: var(--fz-small);
  color: var(--color-grey-gold);
  line-height: 1.7;
}

.site-footer__trust {
  font-size: var(--fz-tiny);
  color: var(--color-grey-gold);
  line-height: 1.6;
  border-left: 2px solid var(--color-gold);
  padding-left: var(--sp-4);
  margin-top: var(--sp-5);
  opacity: 0.8;
}

.site-footer__bottom {
  border-top: 1px solid rgba(201, 162, 39, 0.1);
  background: linear-gradient(90deg, var(--color-deep-blue), var(--color-ink));
}

.site-footer__bottom-inner {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-4);
  padding-bottom: var(--sp-4);
}

.site-footer__copyright {
  font-size: var(--fz-tiny);
  color: var(--color-grey-gold);
  margin: 0;
  font-family: var(--font-data);
}

.site-footer__icp {
  font-size: var(--fz-tiny);
  color: var(--color-grey-gold);
  margin: 0;
  font-family: var(--font-data);
  letter-spacing: 0.05em;
}

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

.site-main {
  min-height: 70vh;
  padding-bottom: var(--sp-10);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--fz-small);
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--t-fast);
}

.btn--gold {
  background: linear-gradient(135deg, var(--color-gold), #a8821f);
  color: var(--color-ink);
  border-color: var(--color-gold);
}

.btn--gold:hover {
  background: linear-gradient(135deg, var(--color-gold-bright), var(--color-gold));
  color: var(--color-ink);
  box-shadow: 0 4px 24px rgba(201, 162, 39, 0.35);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-gold);
  border-color: rgba(201, 162, 39, 0.4);
}

.btn--ghost:hover {
  border-color: var(--color-gold);
  color: var(--color-gold-bright);
  background: rgba(201, 162, 39, 0.08);
  transform: translateY(-2px);
}

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-bottom: var(--sp-6);
  font-family: var(--font-data);
  font-size: var(--fz-tiny);
  color: var(--color-grey-gold);
  list-style: none;
  padding: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li::after {
  content: "◈";
  display: inline-block;
  margin-left: var(--sp-2);
  color: var(--color-gold);
  font-size: 0.6rem;
  opacity: 0.6;
}

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

.breadcrumb a {
  color: var(--color-gold);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-gold-bright);
}

.breadcrumb [aria-current="page"] {
  color: var(--color-cream);
}

/* ---------- Page Hero ---------- */

.page-hero {
  padding-block: var(--sp-10) var(--sp-8);
  border-bottom: 1px solid rgba(201, 162, 39, 0.1);
  position: relative;
}

.page-hero__subtitle {
  font-family: var(--font-data);
  font-size: var(--fz-tiny);
  letter-spacing: 0.4em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: var(--sp-3);
}

.page-hero__title {
  max-width: 14em;
}

.page-hero__meta {
  font-family: var(--font-data);
  font-size: var(--fz-small);
  color: var(--color-grey-gold);
  margin-top: var(--sp-4);
}

/* ---------- Panel / 研究板卡片 ---------- */

.panel {
  background: var(--color-charcoal);
  border: 1px solid rgba(201, 162, 39, 0.14);
  border-radius: var(--radius-md);
  padding: var(--sp-5) var(--sp-6);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.panel--glass {
  background: rgba(26, 26, 26, 0.6);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-color: rgba(201, 162, 39, 0.18);
}

.panel--data {
  background: linear-gradient(145deg, var(--color-deep-blue), var(--color-charcoal));
  border-top: 3px solid var(--color-gold);
}

/* ---------- Section Title ---------- */

.section-title {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid rgba(201, 162, 39, 0.18);
}

.section-title__index {
  font-family: var(--font-data);
  font-size: var(--fz-tiny);
  color: var(--color-gold);
  opacity: 0.8;
}

/* ---------- Chapter ---------- */

.chapter {
  padding-block: var(--sp-8);
}

.chapter + .chapter {
  border-top: 1px solid rgba(201, 162, 39, 0.1);
}

/* ---------- Data Row ---------- */

.data-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-4);
  padding-block: var(--sp-2);
  border-bottom: 1px dashed rgba(201, 162, 39, 0.12);
}

.data-row__label {
  font-size: var(--fz-small);
  color: var(--color-grey-gold);
}

.data-row__value {
  font-family: var(--font-data);
  font-size: 1.1rem;
  color: var(--color-gold-bright);
  letter-spacing: 0.04em;
}

/* ---------- Chip / Badge ---------- */

.chip {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  background: rgba(201, 162, 39, 0.1);
  border: 1px solid rgba(201, 162, 39, 0.25);
  border-radius: 999px;
  font-size: 0.72rem;
  color: var(--color-gold);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.badge--hot {
  background: var(--color-crimson);
  color: #f1c6c6;
}

.badge--new {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-bright));
  color: var(--color-ink);
}

/* ---------- Table Wrap ---------- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid rgba(201, 162, 39, 0.12);
  border-radius: var(--radius-md);
  background: var(--color-charcoal);
}

.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fz-small);
}

.table-wrap th,
.table-wrap td {
  padding: var(--sp-3) var(--sp-4);
  text-align: left;
  border-bottom: 1px solid rgba(201, 162, 39, 0.1);
  white-space: nowrap;
}

.table-wrap th {
  font-family: var(--font-heading);
  color: var(--color-gold);
  background: rgba(201, 162, 39, 0.06);
}

.table-wrap tr:last-child td {
  border-bottom: none;
}

.table-wrap td {
  color: var(--color-cream);
  font-family: var(--font-data);
}

/* ---------- Note ---------- */

.note {
  padding: var(--sp-4) var(--sp-5);
  border-left: 3px solid var(--color-gold);
  background: rgba(201, 162, 39, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: var(--fz-small);
  color: var(--color-cream);
}

.note--alert {
  border-left-color: var(--color-crimson);
  background: rgba(139, 0, 0, 0.1);
}

/* ---------- Accordion ---------- */

.accordion {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.accordion__trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-5);
  background: var(--color-charcoal);
  border: 1px solid rgba(201, 162, 39, 0.15);
  border-radius: var(--radius-sm);
  color: var(--color-cream);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.accordion__trigger:hover {
  border-color: rgba(201, 162, 39, 0.4);
}

.accordion__trigger[aria-expanded="true"] {
  border-color: var(--color-gold);
  background: rgba(201, 162, 39, 0.08);
  color: var(--color-gold-bright);
}

.accordion__icon {
  flex: none;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(201, 162, 39, 0.4);
  color: var(--color-gold);
  font-size: 0.85rem;
  font-family: var(--font-data);
  transition: transform var(--t-fast), background var(--t-fast);
}

.accordion__trigger[aria-expanded="true"] .accordion__icon {
  transform: rotate(45deg);
  background: rgba(201, 162, 39, 0.15);
}

.accordion__panel {
  margin-top: 2px;
  padding: var(--sp-4) var(--sp-5);
  border-left: 2px solid var(--color-gold);
  background: rgba(26, 26, 26, 0.5);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: var(--fz-small);
  line-height: 1.8;
  color: var(--color-cream);
}

/* ---------- Tabs ---------- */

.tabs__list {
  display: flex;
  gap: var(--sp-2);
  border-bottom: 1px solid rgba(201, 162, 39, 0.2);
  padding-bottom: 0;
  margin-bottom: var(--sp-4);
  overflow-x: auto;
}

.tabs__trigger {
  padding: 0.6rem 1.2rem;
  background: transparent;
  border: 1px solid rgba(201, 162, 39, 0.15);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  color: var(--color-grey-gold);
  font-size: var(--fz-small);
  font-family: var(--font-body);
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}

.tabs__trigger:hover {
  color: var(--color-gold-bright);
  background: rgba(201, 162, 39, 0.05);
}

.tabs__trigger[aria-selected="true"],
.tabs__trigger.is-active {
  color: var(--color-gold-bright);
  background: rgba(201, 162, 39, 0.08);
  border-color: rgba(201, 162, 39, 0.4);
}

.tabs__panel {
  font-size: var(--fz-small);
  line-height: 1.8;
  color: var(--color-cream);
}

/* ---------- Image Figures ---------- */

.image-figure {
  position: relative;
  margin-block: var(--sp-6);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-charcoal);
  border: 1px solid rgba(201, 162, 39, 0.14);
}

.image-figure__frame {
  position: relative;
  width: 100%;
  background:
    linear-gradient(135deg, var(--color-deep-blue) 0%, var(--color-ink) 100%),
    var(--color-charcoal);
}

.image-figure--landscape .image-figure__frame {
  aspect-ratio: 16 / 9;
}

.image-figure--portrait .image-figure__frame {
  aspect-ratio: 3 / 4;
}

.image-figure--square .image-figure__frame {
  aspect-ratio: 1 / 1;
}

.image-figure__caption {
  padding: var(--sp-3) var(--sp-4);
  color: var(--color-grey-gold);
  font-size: var(--fz-tiny);
  border-top: 1px solid rgba(201, 162, 39, 0.1);
  background: rgba(10, 10, 10, 0.4);
}

/* ---------- Reveal Scroll Animation ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-gold), var(--color-gold-bright));
  z-index: var(--z-progress);
  box-shadow: 0 0 12px rgba(201, 162, 39, 0.5);
  pointer-events: none;
}

/* ---------- Scrollspy ---------- */

.scrollspy-link.is-active {
  color: var(--color-gold-bright);
  border-left-color: var(--color-gold);
  background: rgba(201, 162, 39, 0.08);
}

/* ---------- Desktop Side Rail ---------- */

@media (min-width: 1024px) {
  .site-header {
    position: fixed;
    top: var(--sp-4);
    left: var(--sp-4);
    bottom: var(--sp-4);
    width: var(--header-width);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(201, 162, 39, 0.14);
    background:
      linear-gradient(160deg, #151515 0%, var(--color-ink) 55%, var(--color-deep-blue) 130%);
    box-shadow: var(--shadow-soft);
    overflow-y: auto;
    overflow-x: hidden;
  }

  .site-header__inner {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    height: 100%;
    flex-wrap: nowrap;
    max-width: none;
    margin: 0;
    padding: var(--sp-6) var(--sp-5);
  }

  .site-header__inner .site-brand {
    padding: 0 var(--sp-2);
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding-top: var(--sp-6);
  }

  .site-nav__list {
    flex: 1;
  }

  .site-nav__meta {
    display: block;
  }

  .site-main,
  .site-footer {
    margin-left: var(--content-offset);
  }

  .site-main {
    padding-top: var(--sp-8);
  }

  .site-footer__grid {
    grid-template-columns: 4fr 3fr 3fr 2fr;
    gap: var(--sp-8);
  }

  .site-footer__bottom-inner {
    flex-direction: row;
  }
}

/* ---------- Tablet ---------- */

@media (min-width: 768px) and (max-width: 1023px) {
  .site-header {
    position: sticky;
    top: 0;
    background: rgba(10, 10, 10, 0.94);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
  }

  .site-header__inner {
    max-width: none;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- Mobile ---------- */

@media (max-width: 767px) {
  .site-header {
    position: sticky;
    top: 0;
    background: rgba(10, 10, 10, 0.96);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }

  .site-header__inner {
    max-width: none;
    padding: var(--sp-3) var(--container-pad);
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
  }

  .site-brand__subtitle {
    display: none;
  }

  .page-hero {
    padding-block: var(--sp-6) var(--sp-6);
  }
}

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

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .scroll-progress {
    display: none;
  }
}