/* =========================================
   B的实验室 — DARK BDSM AESTHETIC
   ========================================= */

:root {
  --black:       #000000;
  --deep:        #060608;
  --dark:        #0d0d0f;
  --card-bg:     #111115;
  --border:      #2a1a1a;
  --red:         #8b0000;
  --red-bright:  #cc1111;
  --red-glow:    #ff2222;
  --gold:        #8b6914;
  --gold-bright: #c9961a;
  --gold-glow:   #f5c842;
  --silver:      #555570;
  --text-dim:    #555565;
  --text-mid:    #888899;
  --text:        #bbbbcc;
  --text-bright: #ddddef;
  --white:       #f0f0ff;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background-color: var(--deep);
  color: var(--text);
  font-family: 'Noto Serif SC', serif;
  overflow-x: hidden;
  line-height: 1.7;
  cursor: crosshair;
}

/* ── Particles ── */
#particles {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ── Scanlines ── */
.scanlines {
  position: fixed; inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 3px,
    rgba(0,0,0,0.18) 3px,
    rgba(0,0,0,0.18) 4px
  );
  pointer-events: none;
  z-index: 1;
  animation: scanroll 8s linear infinite;
}
@keyframes scanroll {
  from { background-position: 0 0; }
  to   { background-position: 0 100px; }
}

/* ── Noise ── */
.noise {
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 2;
  opacity: 0.4;
}

/* ── Header ── */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 3rem;
  height: 70px;
  background: linear-gradient(180deg, rgba(0,0,0,0.95) 0%, rgba(6,6,8,0.85) 100%);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-symbol {
  font-size: 2.2rem;
  color: var(--red-bright);
  text-shadow: 0 0 18px var(--red-glow), 0 0 40px rgba(204,17,17,0.3);
  animation: pulse-red 3s ease-in-out infinite;
}

@keyframes pulse-red {
  0%, 100% { text-shadow: 0 0 18px var(--red-glow), 0 0 40px rgba(204,17,17,0.3); }
  50%       { text-shadow: 0 0 28px var(--red-glow), 0 0 60px rgba(255,34,34,0.5); }
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-main {
  font-family: 'Cinzel Decorative', serif;
  font-size: 1.05rem;
  color: var(--text-bright);
  letter-spacing: 0.08em;
}

.logo-sub {
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  color: var(--gold-bright);
  font-family: 'Orbitron', monospace;
}

.main-nav {
  display: flex;
  gap: 2.5rem;
}

.main-nav a {
  font-family: 'Noto Serif SC', serif;
  font-size: 0.82rem;
  color: var(--text-mid);
  text-decoration: none;
  letter-spacing: 0.15em;
  position: relative;
  transition: color 0.3s;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--red-bright);
  transition: width 0.3s;
  box-shadow: 0 0 6px var(--red-glow);
}

.main-nav a:hover { color: var(--red-bright); }
.main-nav a:hover::after { width: 100%; }

.header-chain {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.4em;
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px 2rem 4rem;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(139,0,0,0.12) 0%, transparent 70%),
    linear-gradient(180deg, #000 0%, var(--deep) 60%, var(--dark) 100%);
}

.hero-bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(139,0,0,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139,0,0,0.06) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black, transparent);
}

.hero-content {
  position: relative;
  z-index: 5;
  max-width: 800px;
}

/* Glitch effect */
.glitch-wrap { margin-bottom: 1.5rem; }

.glitch {
  font-family: 'Cinzel Decorative', serif;
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 900;
  color: var(--white);
  letter-spacing: 0.04em;
  position: relative;
  display: inline-block;
  text-shadow: 0 0 30px rgba(200,200,255,0.15);
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  top: 0; left: 0;
  width: 100%;
}

.glitch::before {
  color: var(--red-bright);
  animation: glitch-1 4s infinite;
  clip-path: polygon(0 0, 100% 0, 100% 35%, 0 35%);
  opacity: 0;
}

.glitch::after {
  color: #4488ff;
  animation: glitch-2 4s infinite;
  clip-path: polygon(0 65%, 100% 65%, 100% 100%, 0 100%);
  opacity: 0;
}

@keyframes glitch-1 {
  0%, 90%, 100% { opacity: 0; transform: translate(0); }
  92%  { opacity: 0.8; transform: translate(-4px, 2px); }
  94%  { opacity: 0.8; transform: translate(4px, -2px); }
  96%  { opacity: 0.8; transform: translate(-2px, 1px); }
  98%  { opacity: 0; }
}

@keyframes glitch-2 {
  0%, 91%, 100% { opacity: 0; transform: translate(0); }
  93%  { opacity: 0.7; transform: translate(4px, -2px); }
  95%  { opacity: 0.7; transform: translate(-4px, 2px); }
  97%  { opacity: 0.7; transform: translate(2px, -1px); }
  99%  { opacity: 0; }
}

.hero-sub {
  font-family: 'Orbitron', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.35em;
  color: var(--gold-bright);
  text-transform: uppercase;
  margin-bottom: 2rem;
  text-shadow: 0 0 12px rgba(245,200,66,0.4);
}

.hero-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.divider-line {
  flex: 1;
  max-width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--red), transparent);
}

.center-symbol {
  color: var(--gold-bright);
  font-size: 1.2rem;
  text-shadow: 0 0 12px var(--gold-glow);
}

.chain-left, .chain-right {
  font-size: 1.1rem;
  opacity: 0.6;
  animation: sway 3s ease-in-out infinite;
}
.chain-right { animation-delay: 1.5s; }

@keyframes sway {
  0%, 100% { transform: rotate(-5deg); }
  50%       { transform: rotate(5deg); }
}

.hero-desc {
  font-size: 1rem;
  color: var(--text);
  line-height: 2;
  margin-bottom: 3rem;
  text-shadow: 0 0 20px rgba(0,0,0,0.8);
}

.cta-btn {
  position: relative;
  display: inline-block;
  padding: 1rem 3rem;
  font-family: 'Cinzel Decorative', serif;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--white);
  text-decoration: none;
  border: 1px solid var(--red-bright);
  background: transparent;
  cursor: pointer;
  overflow: hidden;
  transition: color 0.3s, border-color 0.3s;
}

.cta-btn::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
  z-index: 0;
}

.cta-btn:hover::before { transform: scaleX(1); }
.cta-btn:hover { border-color: var(--red-glow); }

.btn-text { position: relative; z-index: 1; }

.btn-glow {
  position: absolute; inset: 0;
  box-shadow: inset 0 0 20px rgba(204,17,17,0.2);
}

.cta-btn:hover .btn-glow {
  box-shadow: inset 0 0 30px rgba(255,34,34,0.4), 0 0 20px rgba(255,34,34,0.3);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.scroll-indicator span {
  display: block;
  width: 2px; height: 10px;
  background: var(--red-bright);
  border-radius: 2px;
  animation: scroll-bounce 1.5s ease-in-out infinite;
  opacity: 0;
}

.scroll-indicator span:nth-child(1) { animation-delay: 0s; }
.scroll-indicator span:nth-child(2) { animation-delay: 0.2s; }
.scroll-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes scroll-bounce {
  0%   { opacity: 0; transform: translateY(-6px); }
  50%  { opacity: 1; }
  100% { opacity: 0; transform: translateY(6px); }
}

/* ── Section Common ── */
section { position: relative; z-index: 5; }

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-title {
  font-family: 'Cinzel Decorative', serif;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  color: var(--text-bright);
  letter-spacing: 0.06em;
  margin-bottom: 0.6rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px; left: 20%; right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--red-bright), transparent);
  box-shadow: 0 0 8px var(--red-glow);
}

.section-subtitle {
  font-family: 'Orbitron', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.4em;
  color: var(--gold-bright);
  margin-top: 1.2rem;
  text-transform: uppercase;
}

/* ── Zones ── */
.zones {
  padding: 7rem 2rem;
  background:
    linear-gradient(180deg, var(--dark) 0%, #080810 50%, var(--dark) 100%);
}

.zones-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

.zone-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 2.5rem 2rem;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.4s, transform 0.3s;
}

.zone-card::before {
  content: '';
  position: absolute; top: 0; left: 0;
  width: 3px; height: 0;
  background: var(--red-bright);
  transition: height 0.4s;
  box-shadow: 0 0 8px var(--red-glow);
}

.zone-card:hover { border-color: rgba(204,17,17,0.4); transform: translateY(-3px); }
.zone-card:hover::before { height: 100%; }

.zone-card.featured {
  border-color: rgba(139,0,0,0.5);
  background: linear-gradient(135deg, #111115 0%, #18050a 100%);
}

.zone-badge {
  position: absolute;
  top: 1rem; right: 1rem;
  font-family: 'Orbitron', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--gold-bright);
  border: 1px solid var(--gold);
  padding: 2px 8px;
}

.zone-icon {
  font-size: 2rem;
  margin-bottom: 1.2rem;
  display: block;
  filter: drop-shadow(0 0 8px rgba(204,17,17,0.4));
}

.zone-glow {
  position: absolute;
  top: -20px; right: -20px;
  width: 120px; height: 120px;
  background: radial-gradient(circle, rgba(139,0,0,0.08) 0%, transparent 70%);
  pointer-events: none;
  transition: opacity 0.4s;
  opacity: 0;
}

.zone-card:hover .zone-glow { opacity: 1; }

.zone-card h3 {
  font-family: 'Cinzel Decorative', serif;
  font-size: 1rem;
  color: var(--text-bright);
  margin-bottom: 0.8rem;
  letter-spacing: 0.04em;
}

.zone-card p {
  font-size: 0.88rem;
  color: var(--text-mid);
  line-height: 1.8;
  margin-bottom: 1.2rem;
}

.zone-tag {
  font-family: 'Orbitron', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  color: var(--red-bright);
  opacity: 0.7;
}

/* ── Rules ── */
.rules {
  padding: 7rem 2rem;
  background:
    radial-gradient(ellipse 70% 50% at 50% 50%, rgba(139,0,0,0.07) 0%, transparent 70%),
    var(--deep);
}

.rules-inner {
  max-width: 800px;
  margin: 0 auto;
}

.rules-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.rule-item {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}

.rule-item:first-child { border-top: 1px solid var(--border); }

.rule-item:hover {
  background: rgba(139,0,0,0.04);
  padding-left: 1rem;
  margin-left: -1rem;
  padding-right: 1rem;
  margin-right: -1rem;
}

.rule-num {
  font-family: 'Cinzel Decorative', serif;
  font-size: 1.4rem;
  color: var(--red-bright);
  min-width: 40px;
  text-shadow: 0 0 12px rgba(204,17,17,0.5);
  opacity: 0.8;
}

.rule-content h4 {
  font-family: 'Noto Serif SC', serif;
  font-size: 1rem;
  color: var(--text-bright);
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.rule-content p {
  font-size: 0.88rem;
  color: var(--text-mid);
  line-height: 1.9;
}

/* ── Contact ── */
.contact {
  padding: 7rem 2rem;
  background: linear-gradient(180deg, var(--dark) 0%, #000 100%);
}

.contact-inner {
  max-width: 600px;
  margin: 0 auto;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-family: 'Orbitron', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--gold-bright);
  text-transform: uppercase;
}

.form-group input,
.form-group textarea {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-bottom-color: var(--silver);
  padding: 0.85rem 1rem;
  color: var(--text);
  font-family: 'Noto Serif SC', serif;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.3s, background 0.3s;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--red-bright);
  background: rgba(139,0,0,0.05);
  box-shadow: 0 0 12px rgba(204,17,17,0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-dim);
}

.submit-btn {
  position: relative;
  padding: 1rem 2rem;
  font-family: 'Cinzel Decorative', serif;
  font-size: 0.82rem;
  letter-spacing: 0.2em;
  color: var(--white);
  background: transparent;
  border: 1px solid var(--red-bright);
  cursor: pointer;
  overflow: hidden;
  transition: color 0.3s;
  align-self: flex-start;
}

.submit-btn::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
  z-index: 0;
}

.submit-btn:hover::before { transform: scaleX(1); }
.submit-btn span:first-child { position: relative; z-index: 1; }

.contact-decor {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 2rem;
}

.decor-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border));
}

.decor-line:last-child {
  background: linear-gradient(90deg, var(--border), transparent);
}

.decor-symbol {
  font-family: 'Orbitron', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  color: var(--text-dim);
  white-space: nowrap;
}

/* ── Footer ── */
.site-footer {
  position: relative;
  z-index: 5;
  background: #000;
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-logo {
  font-size: 2rem;
  color: var(--red-bright);
  margin-bottom: 1rem;
  text-shadow: 0 0 18px var(--red-glow);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
  letter-spacing: 0.08em;
}

.footer-warning {
  font-size: 0.72rem;
  color: rgba(139,0,0,0.7);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.footer-chains {
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--text-dim);
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--card-bg);
  border: 1px solid var(--red-bright);
  color: var(--text-bright);
  padding: 1rem 2rem;
  font-family: 'Orbitron', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  z-index: 999;
  transition: transform 0.4s ease, opacity 0.4s;
  opacity: 0;
  box-shadow: 0 0 20px rgba(204,17,17,0.3);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .site-header { padding: 0 1.5rem; }
  .main-nav { gap: 1.5rem; }
  .main-nav a { font-size: 0.75rem; }
  .zones-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 90px; }
  .rule-item { gap: 1rem; }
}

@media (max-width: 480px) {
  .main-nav { display: none; }
}

/* ── Custom Scrollbar ── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--red); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--red-bright); }

/* ── Selection ── */
::selection {
  background: rgba(139,0,0,0.6);
  color: var(--white);
}

/* ════════════════════════════════════════
   DARK AESTHETIC DECORATIONS
   ════════════════════════════════════════ */

/* ── 荆棘藤蔓 ── */
.deco-thorn {
  position: absolute;
  top: 0;
  width: 110px;
  height: 600px;
  pointer-events: none;
  z-index: 3;
  opacity: 0;
  animation: thorn-fade-in 2s ease 0.5s forwards;
  /* 防止 SVG 自动拉伸 */
  flex-shrink: 0;
  overflow: visible;
}
.deco-thorn-left  { left: 0; }
.deco-thorn-right { right: 0; transform: scaleX(-1); }

@keyframes thorn-fade-in {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.deco-thorn-right { animation: thorn-fade-in-right 2s ease 0.8s forwards; opacity: 0; transform: none; }
@keyframes thorn-fade-in-right {
  from { opacity: 0; transform: scaleX(-1) translateY(20px); }
  to   { opacity: 1; transform: scaleX(-1) translateY(0); }
}

/* ── 五芒星 ── */
.deco-pentagram {
  position: absolute;
  bottom: 5rem;
  left: 50%;
  margin-left: -80px; /* 代替 transform，避免与旋转动画冲突 */
  width: 160px;
  height: 160px;
  pointer-events: none;
  z-index: 3;
  opacity: 0.25;
  animation: pentagram-spin 60s linear infinite, pentagram-pulse 4s ease-in-out infinite;
}
@keyframes pentagram-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
@keyframes pentagram-pulse {
  0%, 100% { opacity: 0.15; }
  50%       { opacity: 0.35; }
}

/* ── 锁链分割带 ── */
.chain-divider {
  position: relative;
  z-index: 5;
  width: 100%;
  overflow: hidden;
  background: #000;
  border-top: 1px solid rgba(90,16,16,0.3);
  border-bottom: 1px solid rgba(90,16,16,0.3);
  opacity: 0.8;
}
.chain-svg {
  display: block;
  width: 100%;
  height: 40px;
}

/* ── 蜡烛 ── */
.deco-candle {
  position: absolute;
  width: 60px;
  height: 160px;
  pointer-events: none;
  z-index: 4;
  top: 3rem;
  opacity: 0.75;
}
.deco-candle-left  { left: 3rem; }
.deco-candle-right { right: 3rem; }

.candle-flame {
  animation: flame-flicker 2s ease-in-out infinite;
  transform-origin: 30px 32px;
}
@keyframes flame-flicker {
  0%   { transform: skewX(0deg) scaleY(1); opacity: 0.9; }
  20%  { transform: skewX(-3deg) scaleY(1.05); opacity: 1; }
  40%  { transform: skewX(2deg) scaleY(0.95); opacity: 0.85; }
  60%  { transform: skewX(-2deg) scaleY(1.08); opacity: 1; }
  80%  { transform: skewX(3deg) scaleY(0.97); opacity: 0.9; }
  100% { transform: skewX(0deg) scaleY(1); opacity: 0.9; }
}

/* ── 铆钉装饰 ── */
.rivet {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #5a3a3a, #1a0808);
  border: 1px solid #3a1010;
  box-shadow: 0 0 3px rgba(0,0,0,0.8), inset 0 1px 1px rgba(255,200,200,0.08);
  opacity: 0;
  transition: opacity 0.4s;
  z-index: 2;
}
.zone-card:hover .rivet { opacity: 1; }
.r-tl { top: 8px;  left: 8px;  }
.r-tr { top: 8px;  right: 8px; }
.r-bl { bottom: 8px; left: 8px;  }
.r-br { bottom: 8px; right: 8px; }

/* ── 蜡烛光晕（Rules区背景增强） ── */
.rules {
  padding: 7rem 2rem;
  background:
    radial-gradient(ellipse 70% 50% at 50% 50%, rgba(139,0,0,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 20% 60% at 5% 50%, rgba(255,120,0,0.04) 0%, transparent 60%),
    radial-gradient(ellipse 20% 60% at 95% 50%, rgba(255,120,0,0.04) 0%, transparent 60%),
    var(--deep);
}

@media (max-width: 900px) {
  .deco-thorn { display: none; }
  .deco-candle { display: none; }
  .deco-pentagram { width: 100px; height: 100px; }
}