/* =============================================
   青青视界 · 全站共享样式 /assets/site.css
   暗黑华丽 · 复古胶片 · 夜店霓虹 · 框架式导航
   ============================================= */

:root {
  --clr-bg: #0d1117;
  --clr-bg-card: #1f2630;
  --clr-neon-purple: #a55eea;
  --clr-neon-pink: #ff6ec7;
  --clr-gold: #b8860b;
  --clr-blue: #00d4ff;
  --clr-green: #00ff9f;
  --clr-cream: #f0e6d2;
  --clr-gray: #8b949e;

  --font-serif: 'Songti SC', 'Noto Serif SC', 'Source Han Serif SC', 'STSong', 'SimSun', Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Noto Sans SC', 'Source Han Sans SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'JetBrains Mono', Consolas, 'Courier New', monospace;

  --nav-rail-width: 92px;
  --frame-rail-width: 56px;
  --header-top-h: 80px;
  --max-w: 1400px;
  --content-pad: 2.5rem;
  --transition-fast: 180ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 380ms cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--clr-cream);
  background-color: var(--clr-bg);
  background-image:
    radial-gradient(ellipse 70% 45% at 85% -5%, rgba(255, 110, 199, 0.05), transparent),
    radial-gradient(ellipse 50% 35% at 5% 45%, rgba(165, 94, 234, 0.045), transparent),
    radial-gradient(ellipse 45% 35% at 95% 75%, rgba(0, 212, 255, 0.035), transparent);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 900;
  line-height: 1.3;
  color: var(--clr-cream);
  letter-spacing: 0.02em;
}

p {
  margin: 0 0 1rem;
}

ul, ol {
  padding-left: 1.5rem;
}

a {
  color: var(--clr-neon-pink);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--clr-neon-purple);
}

:focus-visible {
  outline: 2px solid var(--clr-neon-purple);
  outline-offset: 3px;
}

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

.mono {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.text-gray {
  color: var(--clr-gray);
}

.text-purple {
  color: var(--clr-neon-purple);
}

.text-pink {
  color: var(--clr-neon-pink);
}

.text-gold {
  color: var(--clr-gold);
}

/* ---------- Typography Scale ---------- */
h1, .h1 {
  font-size: clamp(1.7rem, 4.5vw, 2.6rem);
  font-weight: 900;
  letter-spacing: 0.04em;
}

h2, .h2 {
  font-size: clamp(1.3rem, 3vw, 1.75rem);
}

h3, .h3 {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
}

h4, .h4 {
  font-size: 1.05rem;
}

/* ---------- Layout / Main ---------- */
#main-content {
  margin-left: var(--nav-rail-width);
  margin-right: var(--frame-rail-width);
  min-height: 70vh;
  outline: none;
}

.container {
  max-width: calc(var(--max-w) - var(--nav-rail-width) - var(--frame-rail-width));
  margin: 0 auto;
  padding: 0 var(--content-pad);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 42px;
  padding: 0.65rem 1.5rem;
  border: 1px solid rgba(165, 94, 234, 0.6);
  border-radius: 2px;
  background: transparent;
  color: var(--clr-neon-purple);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 400;
  line-height: 1.4;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--clr-neon-pink);
  color: var(--clr-neon-pink);
  background: rgba(255, 110, 199, 0.08);
  box-shadow: 0 0 14px rgba(255, 110, 199, 0.25);
}

.btn-primary {
  background: var(--clr-neon-purple);
  border-color: var(--clr-neon-purple);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #9147d6;
  border-color: #9147d6;
  color: #fff;
  box-shadow: 0 0 18px rgba(165, 94, 234, 0.45);
}

.btn-monochrome {
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--clr-gray);
}

.btn-monochrome:hover,
.btn-monochrome:focus-visible {
  border-color: var(--clr-gold);
  color: var(--clr-gold);
  background: rgba(184, 134, 11, 0.08);
  box-shadow: 0 0 12px rgba(184, 134, 11, 0.2);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.7rem;
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--clr-gray);
}

.breadcrumb li + li::before {
  content: '/';
  color: var(--clr-neon-purple);
  font-size: 0.68rem;
}

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

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

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

/* ---------- Media Frames ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--clr-bg-card);
  border: 1px solid rgba(165, 94, 234, 0.14);
  border-radius: 3px;
  overflow: hidden;
}

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

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

.media-frame img,
.media-frame video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(135deg, rgba(255, 110, 199, 0.05), rgba(0, 212, 255, 0.06));
  pointer-events: none;
}

/* ---------- Section Label ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--clr-neon-purple);
}

.section-label::before {
  content: '';
  width: 30px;
  height: 1px;
  background: var(--clr-neon-purple);
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: var(--clr-neon-purple);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 400;
  line-height: 1.4;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  transform: translateY(-130%);
  transition: transform var(--transition-fast);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: none;
  box-shadow: 0 4px 20px rgba(165, 94, 234, 0.6);
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 600;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-neon-purple), var(--clr-neon-pink), var(--clr-blue));
  box-shadow: 0 0 10px rgba(255, 110, 199, 0.55);
  pointer-events: none;
}

/* ---------- Header / Topbar ---------- */
.site-header {
  position: relative;
}

.header-topbar {
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--header-top-h);
  margin-left: var(--nav-rail-width);
  padding: 0 var(--content-pad);
  background: rgba(13, 17, 23, 0.84);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(165, 94, 234, 0.14);
}

.header-topbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-batch-badge {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border: 1px solid rgba(255, 110, 199, 0.32);
  border-radius: 999px;
  background: rgba(255, 110, 199, 0.06);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--clr-neon-pink);
  white-space: nowrap;
}

/* ---------- Brand ---------- */
.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.1rem;
  text-decoration: none;
}

.brand-text {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 1.4rem;
  line-height: 1.15;
  letter-spacing: 0.05em;
  color: var(--clr-cream);
  text-shadow:
    0 0 10px rgba(165, 94, 234, 0.65),
    0 0 26px rgba(165, 94, 234, 0.4),
    0 0 60px rgba(255, 110, 199, 0.22);
  white-space: nowrap;
}

.brand-meta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: var(--clr-gray);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ---------- Nav Toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(165, 94, 234, 0.4);
  border-radius: 3px;
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--clr-neon-pink);
  box-shadow: 0 0 14px rgba(255, 110, 199, 0.35);
  outline: none;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--clr-neon-pink);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Site Nav (Desktop Rail) ---------- */
.site-nav {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 150;
  width: var(--nav-rail-width);
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: linear-gradient(180deg, rgba(13, 17, 23, 0.97), rgba(16, 20, 27, 0.98) 30%, rgba(13, 17, 23, 0.98));
  border-right: 1px solid rgba(165, 94, 234, 0.18);
  box-shadow: 2px 0 16px rgba(0, 0, 0, 0.2);
}

.nav-rail-head {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-top-h);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.nav-rail-head-mark {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--clr-cream);
  text-shadow:
    0 0 12px rgba(165, 94, 234, 0.8),
    0 0 28px rgba(165, 94, 234, 0.4),
    0 0 56px rgba(255, 110, 199, 0.2);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0;
  padding: 0;
}

.nav-item + .nav-item {
  margin-top: 0.3rem;
}

.nav-link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.05rem;
  padding: 0.75rem 0.2rem;
  color: var(--clr-gray);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition:
    color var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--clr-cream);
  border-left-color: var(--clr-neon-purple);
  background: linear-gradient(90deg, rgba(165, 94, 234, 0.1), transparent 80%);
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--clr-neon-pink);
  text-shadow: 0 0 8px rgba(255, 110, 199, 0.7);
}

.nav-link:hover .nav-label,
.nav-link[aria-current="page"] .nav-label {
  text-shadow: 0 0 12px rgba(165, 94, 234, 0.55);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--clr-neon-purple);
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

.nav-label {
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: inherit;
  transition: text-shadow var(--transition-fast);
}

.nav-rail-note {
  position: absolute;
  bottom: 1.8rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  color: rgba(184, 134, 11, 0.5);
  writing-mode: vertical-rl;
  white-space: nowrap;
}

.nav-aside {
  display: none;
}

/* ---------- Nav Overlay ---------- */
.nav-overlay {
  display: none;
}

/* ---------- Frame Rail (Right) ---------- */
.frame-rail {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  width: var(--frame-rail-width);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.frame-rail::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent,
    rgba(184, 134, 11, 0.25),
    rgba(184, 134, 11, 0.5),
    rgba(184, 134, 11, 0.25),
    transparent
  );
}

.frame-rail-text {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.25em;
  color: rgba(184, 134, 11, 0.6);
  writing-mode: vertical-rl;
  white-space: nowrap;
  text-transform: uppercase;
}

/* ---------- Back Top ---------- */
.back-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  z-index: 260;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(165, 94, 234, 0.45);
  border-radius: 50%;
  background: rgba(13, 17, 23, 0.86);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  color: var(--clr-neon-pink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  pointer-events: none;
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast),
    visibility 0s linear var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.back-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast),
    visibility 0s,
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.back-top:hover,
.back-top:focus-visible {
  border-color: var(--clr-neon-pink);
  box-shadow: 0 0 18px rgba(255, 110, 199, 0.4);
  color: #fff;
  outline: none;
}

.back-top-arrow {
  display: inline-block;
  font-size: 0.9rem;
  line-height: 1;
}

/* ---------- Reveal ---------- */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js-enabled [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- Theme Filter ---------- */
.is-active {
  border-color: var(--clr-neon-pink) !important;
  color: var(--clr-neon-pink) !important;
  background: rgba(255, 110, 199, 0.08) !important;
  box-shadow: 0 0 14px rgba(255, 110, 199, 0.25) !important;
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  z-index: 10;
  margin-left: var(--nav-rail-width);
  margin-right: var(--frame-rail-width);
  background-color: var(--clr-bg);
  background-image:
    radial-gradient(ellipse 40% 50% at 85% 0%, rgba(255, 110, 199, 0.04), transparent),
    radial-gradient(ellipse 30% 40% at 10% 100%, rgba(165, 94, 234, 0.05), transparent);
}

.footer-topline {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    rgba(165, 94, 234, 0.7) 0%,
    rgba(255, 110, 199, 0.5) 35%,
    rgba(184, 134, 11, 0.5) 70%,
    transparent 100%
  );
  opacity: 0.6;
  pointer-events: none;
  z-index: 2;
}

.footer-corner {
  position: absolute;
  width: 24px;
  height: 24px;
  z-index: 2;
  border-color: rgba(184, 134, 11, 0.45);
  border-style: solid;
  pointer-events: none;
}

.footer-corner-lt {
  top: 10px;
  left: 10px;
  border-width: 1px 0 0 1px;
}

.footer-corner-rt {
  top: 10px;
  right: 10px;
  border-width: 1px 1px 0 0;
}

.footer-inner {
  max-width: calc(var(--max-w) - var(--nav-rail-width) - var(--frame-rail-width));
  margin: 0 auto;
  padding: 3.5rem var(--content-pad) 2.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 2.5rem;
}

.footer-col {
  position: relative;
}

.footer-col-brand::before {
  content: '2009';
  position: absolute;
  bottom: -0.5rem;
  right: 0;
  font-family: var(--font-mono);
  font-size: 3.5rem;
  color: rgba(165, 94, 234, 0.05);
  line-height: 1;
  pointer-events: none;
}

.footer-brand {
  display: inline-block;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--clr-cream);
  text-decoration: none;
  text-shadow: 0 0 16px rgba(165, 94, 234, 0.4);
}

.footer-brand:hover {
  color: var(--clr-cream);
  text-shadow:
    0 0 16px rgba(165, 94, 234, 0.6),
    0 0 40px rgba(255, 110, 199, 0.3);
}

.footer-slogan {
  margin-top: 0.5rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  color: var(--clr-gold);
}

.footer-trust {
  margin-top: 1.2rem;
  max-width: 34em;
  font-size: 0.82rem;
  line-height: 1.8;
  color: var(--clr-gray);
}

.footer-col-title {
  position: relative;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--clr-cream);
  padding-bottom: 0.6rem;
  margin-bottom: 1rem;
}

.footer-col-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-neon-purple), var(--clr-neon-pink));
}

.footer-col-title-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--clr-neon-pink);
  margin-right: 0.35rem;
}

.footer-nav-list,
.footer-legal-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav-list li,
.footer-legal-list li {
  margin-bottom: 0.45rem;
  font-size: 0.88rem;
  line-height: 1.6;
}

.footer-nav-list a {
  color: var(--clr-gray);
  text-decoration: none;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-nav-list a:hover,
.footer-nav-list a:focus-visible {
  color: var(--clr-neon-pink);
  padding-left: 4px;
}

.footer-legal-list a {
  color: var(--clr-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 212, 255, 0.3);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.footer-legal-list a:hover,
.footer-legal-list a:focus-visible {
  color: var(--clr-neon-pink);
  border-bottom-color: var(--clr-neon-pink);
}

.footer-legal-label {
  display: inline-block;
  min-width: 4.5em;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--clr-neon-purple);
  text-transform: uppercase;
}

.footer-legal-value {
  color: var(--clr-gray);
}

.footer-bottom {
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.4rem;
  max-width: calc(var(--max-w) - var(--nav-rail-width) - var(--frame-rail-width));
  margin: 0 auto;
  padding: 1.2rem var(--content-pad);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--clr-gray);
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--clr-gray);
}

.footer-slogan-mini {
  margin-left: auto;
  font-family: var(--font-serif);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: rgba(184, 134, 11, 0.7);
  white-space: nowrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  :root {
    --header-top-h: 68px;
    --content-pad: 1.25rem;
  }

  #main-content {
    margin-left: 0;
    margin-right: 0;
  }

  .header-topbar {
    margin-left: 0;
    padding: 0 1.25rem;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    top: var(--header-top-h);
    width: min(320px, 86vw);
    padding: 1.2rem 0 1.8rem;
    background: rgba(13, 17, 23, 0.98);
    border-right: 1px solid rgba(165, 94, 234, 0.2);
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.55);
    justify-content: flex-start;
    overflow-y: auto;
    transform: translateX(-105%);
    visibility: hidden;
    transition:
      transform var(--transition-smooth),
      visibility 0s linear var(--transition-smooth);
  }

  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition:
      transform var(--transition-smooth),
      visibility 0s;
  }

  .nav-rail-head,
  .nav-rail-note {
    display: none;
  }

  .nav-list {
    padding: 0 0.6rem;
  }

  .nav-item + .nav-item {
    margin-top: 0.15rem;
  }

  .nav-link {
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border-left: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 2px;
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    border-left: none;
    border-bottom-color: rgba(165, 94, 234, 0.35);
    background: rgba(165, 94, 234, 0.08);
  }

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

  .nav-index {
    min-width: 2.1rem;
    font-size: 0.74rem;
  }

  .nav-label {
    font-size: 0.92rem;
    letter-spacing: 0.08em;
  }

  .nav-aside {
    display: block;
    margin: 1.2rem 0.6rem 0;
    padding: 0.9rem 1rem;
    border-left: 2px solid var(--clr-gold);
    background: rgba(184, 134, 11, 0.04);
  }

  .nav-aside-label {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--clr-gold);
  }

  .nav-aside-text {
    margin: 0.4rem 0 0;
    font-size: 0.78rem;
    line-height: 1.7;
    color: var(--clr-gray);
  }

  .nav-overlay[data-open] {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 180;
    background: rgba(4, 7, 11, 0.72);
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
  }

  .frame-rail {
    display: none;
  }

  .back-top {
    right: 1rem;
    bottom: 1rem;
  }

  .site-footer {
    margin-left: 0;
    margin-right: 0;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem 1.5rem;
  }

  .footer-col-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom-inner {
    padding: 1rem 1.25rem;
  }
}

@media (max-width: 620px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-col-brand {
    grid-column: auto;
  }

  .footer-slogan-mini {
    margin-left: 0;
    width: 100%;
  }

  .header-batch-badge {
    display: none;
  }
}

@media (max-width: 560px) {
  .brand-text {
    font-size: 0.98rem;
    letter-spacing: 0.02em;
  }

  .brand-meta {
    display: none;
  }

  .back-top {
    width: 42px;
    height: 42px;
  }
}

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

  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }

  .js-enabled [data-reveal],
  .js-enabled [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
  }
}