@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Serif+JP:wght@400;500;600;700&display=swap');

/* ===== 变量 ===== */
:root {
  --c-red: #ff0000;
  --c-pink: #ff1493;
  --c-dark: #261717;
  --c-dark2: #1a0f0f;
  --c-dark3: #321c1c;
  --c-dark4: #3d2020;
  --c-text: #f0e0e0;
  --c-text-muted: #c8a0a0;
  --c-text-dim: #8a5a5a;
  --c-border: rgba(255, 0, 0, 0.2);
  --c-border-pink: rgba(255, 20, 147, 0.3);
  --c-glow-red: rgba(255, 0, 0, 0.4);
  --c-glow-pink: rgba(255, 20, 147, 0.4);
  --font-serif: 'Noto Serif JP', 'Georgia', serif;
  --font-sans: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
  --nav-h: 56px;
  --brand-h: 52px;
  --header-h: calc(var(--nav-h) + var(--brand-h));
  --radius: 4px;
  --radius-pill: 999px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--c-dark2);
  color: var(--c-text);
}
body {
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--c-dark2);
}
a { color: var(--c-pink); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-red); }
img { max-width: 100%; height: auto; display: block; }
ol, ul { list-style: none; }

/* ===== 极光背景 ===== */
.aurora-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background: var(--c-dark2);
}
.aurora-mesh {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  mix-blend-mode: screen;
}
.aurora-mesh--1 {
  width: 70vw;
  height: 70vw;
  max-width: 800px;
  max-height: 800px;
  top: -20%;
  left: -15%;
  background: radial-gradient(ellipse at center, rgba(255,0,0,0.6) 0%, rgba(255,20,147,0.3) 50%, transparent 70%);
  animation: auroraFloat1 12s ease-in-out infinite alternate;
}
.aurora-mesh--2 {
  width: 60vw;
  height: 60vw;
  max-width: 700px;
  max-height: 700px;
  top: 30%;
  right: -10%;
  background: radial-gradient(ellipse at center, rgba(255,20,147,0.55) 0%, rgba(255,0,0,0.25) 50%, transparent 70%);
  animation: auroraFloat2 10s ease-in-out infinite alternate;
}
.aurora-mesh--3 {
  width: 50vw;
  height: 50vw;
  max-width: 600px;
  max-height: 600px;
  bottom: 10%;
  left: 20%;
  background: radial-gradient(ellipse at center, rgba(200,0,80,0.45) 0%, rgba(255,0,0,0.2) 50%, transparent 70%);
  animation: auroraFloat3 11s ease-in-out infinite alternate;
}
@keyframes auroraFloat1 {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(5%, 8%) scale(1.1); }
}
@keyframes auroraFloat2 {
  from { transform: translate(0, 0) scale(1.05); }
  to { transform: translate(-6%, 5%) scale(0.95); }
}
@keyframes auroraFloat3 {
  from { transform: translate(0, 0) scale(0.98); }
  to { transform: translate(4%, -6%) scale(1.08); }
}
@media (prefers-reduced-motion: reduce) {
  .aurora-mesh { animation: none; }
  html { scroll-behavior: auto; }
}

/* ===== 全局层叠 ===== */
.site-header,
.site-main,
.site-footer,
aside {
  position: relative;
  z-index: 1;
}

/* ===== 顶部 Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 15, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-border);
  padding: 0 clamp(16px, 4vw, 48px);
}
.header-brand {
  display: flex;
  align-items: center;
  height: var(--brand-h);
  border-bottom: 1px solid rgba(255,0,0,0.1);
}
.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--c-text);
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
}
.brand-link:hover { color: var(--c-pink); }
.brand-logo { height: 32px; width: auto; }
.brand-name {
  background: linear-gradient(90deg, var(--c-red), var(--c-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header-nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 16px;
}
.site-nav { flex: 1; overflow-x: auto; scrollbar-width: none; }
.site-nav::-webkit-scrollbar { display: none; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
}
.nav-pill {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-border);
  background: rgba(255,255,255,0.04);
  color: var(--c-text-muted);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  white-space: nowrap;
  transition: all var(--transition);
}
.nav-pill:hover,
.nav-pill--active {
  background: rgba(255,0,0,0.15);
  border-color: var(--c-red);
  color: var(--c-text);
  box-shadow: 0 0 12px var(--c-glow-red);
}
.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 20px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--c-red), var(--c-pink));
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-sans);
  white-space: nowrap;
  box-shadow: 0 0 16px var(--c-glow-pink);
  transition: all var(--transition);
  flex-shrink: 0;
}
.cta-btn:hover {
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 0 28px var(--c-glow-pink), 0 4px 16px rgba(0,0,0,0.4);
}

/* ===== scroll-margin ===== */
section[id] { scroll-margin-top: calc(var(--header-h) + 12px); }

/* ===== 主体 main ===== */
.site-main {
  min-height: calc(100vh - var(--header-h));
}
.content-article {
  width: 100%;
}

/* ===== Hero ===== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 40px) clamp(20px, 6vw, 80px) 80px;
  overflow: hidden;
}
.hero-inner {
  max-width: 720px;
  position: relative;
  z-index: 2;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.badge {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}
.badge--glow {
  background: rgba(255,0,0,0.2);
  border: 1px solid var(--c-red);
  color: var(--c-red);
  box-shadow: 0 0 10px rgba(255,0,0,0.3);
  animation: badgePulse 3s ease-in-out infinite;
}
.badge--outline {
  border: 1px solid var(--c-border-pink);
  color: var(--c-pink);
  background: transparent;
}
.badge--pulse {
  background: rgba(255,20,147,0.15);
  border: 1px solid var(--c-pink);
  color: var(--c-pink);
}
@keyframes badgePulse {
  0%, 100% { box-shadow: 0 0 8px rgba(255,0,0,0.3); }
  50% { box-shadow: 0 0 20px rgba(255,0,0,0.6); }
}
@media (prefers-reduced-motion: reduce) {
  .badge--glow { animation: none; }
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 6vw, 5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.03em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, var(--c-text) 40%, var(--c-pink) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--c-text-muted);
  margin-bottom: 36px;
  max-width: 560px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--c-red) 0%, var(--c-pink) 100%);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 0 20px var(--c-glow-red);
  transition: all var(--transition);
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 0 36px var(--c-glow-pink), 0 6px 20px rgba(0,0,0,0.4);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-border-pink);
  color: var(--c-text);
  font-weight: 500;
  font-size: 1rem;
  background: rgba(255,20,147,0.05);
  transition: all var(--transition);
}
.btn-ghost:hover {
  border-color: var(--c-pink);
  color: var(--c-pink);
  background: rgba(255,20,147,0.12);
  box-shadow: 0 0 16px var(--c-glow-pink);
}
.btn-full { width: 100%; }
.hero-deco {
  position: absolute;
  right: -10%;
  top: 50%;
  transform: translateY(-50%);
  width: 500px;
  height: 500px;
  pointer-events: none;
  z-index: 1;
}
.deco-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.deco-ring--1 {
  width: 300px;
  height: 300px;
  border-color: rgba(255,0,0,0.2);
  animation: ringRotate 12s linear infinite;
}
.deco-ring--2 {
  width: 420px;
  height: 420px;
  border-color: rgba(255,20,147,0.15);
  animation: ringRotate 10s linear infinite reverse;
}
.deco-ring--3 {
  width: 500px;
  height: 500px;
  border-color: rgba(255,0,0,0.08);
  animation: ringRotate 15s linear infinite;
}
@keyframes ringRotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
  .deco-ring { animation: none; }
}

/* ===== 内容布局 ===== */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px clamp(20px, 4vw, 60px) 80px;
  align-items: start;
}
.content-main {
  min-width: 0;
}

/* ===== page-content（page.content 正文） ===== */
.page-content h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--c-text);
  margin: 2.5rem 0 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid;
  border-image: linear-gradient(90deg, var(--c-red), var(--c-pink), transparent) 1;
  letter-spacing: 0.04em;
}
.page-content h2 + p {
  color: var(--c-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.2rem;
}
.page-content h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--c-pink);
  margin: 1.8rem 0 0.6rem;
  letter-spacing: 0.03em;
}
.page-content p {
  color: var(--c-text);
  margin-bottom: 1.2rem;
  font-size: 1rem;
  line-height: 1.85;
}
.page-content a {
  color: var(--c-pink);
  text-decoration: underline;
  text-decoration-color: rgba(255,20,147,0.4);
  transition: all var(--transition);
}
.page-content a:hover {
  color: var(--c-red);
  text-decoration-color: var(--c-red);
}
.page-content ul,
.page-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
  list-style: revert;
}
.page-content li {
  color: var(--c-text);
  margin-bottom: 0.5rem;
  line-height: 1.75;
}
.page-content strong {
  color: #fff;
  font-weight: 700;
}
.page-content em {
  color: var(--c-pink);
  font-style: normal;
}
.page-content section {
  margin-bottom: 3rem;
  padding: 32px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  border-bottom: 3px solid var(--c-red);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.page-content section:hover {
  border-color: rgba(255,0,0,0.35);
  box-shadow: 0 0 30px rgba(255,20,147,0.1);
}
.page-content section:first-child { margin-top: 0; }
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}
.page-content th {
  background: rgba(255,0,0,0.15);
  color: var(--c-text);
  font-weight: 700;
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--c-border);
}
.page-content td {
  padding: 9px 14px;
  border: 1px solid var(--c-border);
  color: var(--c-text-muted);
}
.page-content tr:hover td { background: rgba(255,20,147,0.05); }

/* ===== Aside ===== */
.content-aside {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.aside-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  border-bottom: 3px solid var(--c-red);
  padding: 24px;
}
.aside-card--glow {
  border-color: var(--c-border-pink);
  border-bottom-color: var(--c-pink);
  background: rgba(255,20,147,0.06);
}
.aside-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 4px;
}
.aside-lead {
  font-size: 0.82rem;
  color: var(--c-text-dim);
  margin-bottom: 16px;
}
.aside-nav-list { display: flex; flex-direction: column; gap: 4px; }
.aside-nav-item {}
.aside-nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius);
  color: var(--c-text-muted);
  font-size: 0.88rem;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.aside-nav-link:hover {
  background: rgba(255,0,0,0.1);
  border-color: var(--c-border);
  color: var(--c-text);
}
.aside-nav-num {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  color: var(--c-red);
  font-weight: 700;
  flex-shrink: 0;
  width: 22px;
}
.aside-nav-text { flex: 1; }
.aside-cta-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 6px;
}
.aside-cta-desc {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  margin-bottom: 16px;
}

/* ===== Scroll Reveal ===== */
.page-content section {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease, border-color var(--transition), box-shadow var(--transition);
}
.page-content section.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .page-content section {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ===== Footer ===== */
.site-footer {
  background: var(--c-dark2);
  border-top: 1px solid var(--c-border);
  padding: 0 clamp(20px, 4vw, 60px);
}
.footer-inner {
  display: flex;
  gap: 40px;
  padding: 48px 0 32px;
  border-bottom: 1px solid rgba(255,0,0,0.1);
}
.footer-col { flex: 1; min-width: 0; }
.footer-col--brand { flex: 1.5; }
.footer-col-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
  display: block;
}
.footer-col-body {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  line-height: 1.7;
  margin-bottom: 10px;
  display: block;
}
.footer-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.footer-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-border);
  font-size: 0.78rem;
  color: var(--c-text-dim);
}
.footer-col dd {
  margin-bottom: 8px;
}
.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--c-text-muted);
  font-size: 0.88rem;
  transition: color var(--transition);
  padding: 2px 0;
}
.footer-link:hover { color: var(--c-pink); }
.footer-notice {
  display: block;
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--c-text-dim);
  padding: 6px 10px;
  border: 1px solid rgba(255,0,0,0.15);
  border-radius: var(--radius);
  background: rgba(255,0,0,0.05);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-copy {
  font-size: 0.82rem;
  color: var(--c-text-dim);
}
.footer-disclaimer {
  font-size: 0.82rem;
  color: var(--c-red);
  font-weight: 500;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .content-layout {
    grid-template-columns: 1fr 260px;
    gap: 32px;
  }
  .hero-deco { display: none; }
}
@media (max-width: 768px) {
  :root {
    --brand-h: 48px;
    --nav-h: 52px;
  }
  .content-layout {
    grid-template-columns: 1fr;
    padding: 40px clamp(16px, 4vw, 32px) 60px;
  }
  .content-aside {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .footer-inner {
    flex-direction: column;
    gap: 28px;
    padding: 36px 0 24px;
  }
  .hero-section {
    padding: calc(var(--header-h) + 20px) 20px 60px;
    min-height: 100svh;
  }
  .hero-title { font-size: clamp(1.8rem, 7vw, 3rem); }
  .nav-list { gap: 4px; }
  .nav-pill { height: 40px; padding: 0 12px; font-size: 0.8rem; }
  .cta-btn { height: 40px; padding: 0 16px; font-size: 0.85rem; }
}
@media (max-width: 480px) {
  .content-aside {
    grid-template-columns: 1fr;
  }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-ghost { width: 100%; justify-content: center; }
  .header-nav-wrap { gap: 8px; }
  .page-content section { padding: 20px 16px; }
}