/* ====================================================================
   BitzNet - 核心样式表 (style.css)
   设计规范：设计说明 05 (深海水族馆 / 赛璐璐平涂 / 卡牌收集 / 蓝紫夜景)
   ==================================================================== */

:root {
  --bg-deep: #0B0A1A;
  --bg-tank: #111026;
  --bg-card: #151330;
  --bg-card-hover: #1c193f;
  --water-blue: #3A6EA5;
  --glow-purple: #8B5CF6;
  --glow-cyan: #22D3EE;
  --accent-lime: #A3E635; /* 唯一主 CTA 强调色 */
  --accent-lime-hover: #bbf451;
  --text-main: #E0F2FE;
  --text-muted: #94A3B8;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(58, 110, 165, 0.35);
  --card-border: rgba(139, 92, 246, 0.35);
  --cel-shadow: 4px 4px 0px #05040d;
  --cel-shadow-card: 6px 6px 0px #05040d;
  --cel-shadow-hover: 8px 8px 0px #05040d;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --max-width: 1180px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.6;
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-deep);
  background-image: 
    radial-gradient(ellipse at 50% 0%, rgba(58, 110, 165, 0.18) 0%, transparent 65%),
    radial-gradient(ellipse at 80% 40%, rgba(139, 92, 246, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(34, 211, 238, 0.08) 0%, transparent 50%);
  background-attachment: fixed;
  overflow-x: hidden;
  position: relative;
}

/* 深海浮游气泡背景层 */
.nn-bubbles-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.nn-bubble {
  position: absolute;
  bottom: -40px;
  background: radial-gradient(circle at 30% 30%, rgba(34, 211, 238, 0.4), rgba(139, 92, 246, 0.1) 70%);
  border: 1px solid rgba(34, 211, 238, 0.5);
  border-radius: 50%;
  opacity: 0.6;
  animation: nn-bubble-rise 14s infinite linear;
}

.nn-bubble:nth-child(1)  { left: 6%;  width: 12px; height: 12px; animation-duration: 12s; animation-delay: 0s; }
.nn-bubble:nth-child(2)  { left: 15%; width: 18px; height: 18px; animation-duration: 16s; animation-delay: 2s; }
.nn-bubble:nth-child(3)  { left: 24%; width: 8px;  height: 8px;  animation-duration: 11s; animation-delay: 5s; }
.nn-bubble:nth-child(4)  { left: 33%; width: 22px; height: 22px; animation-duration: 19s; animation-delay: 1s; }
.nn-bubble:nth-child(5)  { left: 45%; width: 14px; height: 14px; animation-duration: 14s; animation-delay: 7s; }
.nn-bubble:nth-child(6)  { left: 58%; width: 10px; height: 10px; animation-duration: 13s; animation-delay: 3s; }
.nn-bubble:nth-child(7)  { left: 68%; width: 20px; height: 20px; animation-duration: 18s; animation-delay: 4s; }
.nn-bubble:nth-child(8)  { left: 78%; width: 12px; height: 12px; animation-duration: 15s; animation-delay: 8s; }
.nn-bubble:nth-child(9)  { left: 88%; width: 16px; height: 16px; animation-duration: 17s; animation-delay: 6s; }
.nn-bubble:nth-child(10) { left: 94%; width: 8px;  height: 8px;  animation-duration: 10s; animation-delay: 9s; }
.nn-bubble:nth-child(11) { left: 52%; width: 16px; height: 16px; animation-duration: 15s; animation-delay: 11s; }
.nn-bubble:nth-child(12) { left: 82%; width: 14px; height: 14px; animation-duration: 13s; animation-delay: 12s; }

@keyframes nn-bubble-rise {
  0% {
    transform: translateY(0) translateX(0);
    opacity: 0;
  }
  15% {
    opacity: 0.7;
  }
  85% {
    opacity: 0.7;
  }
  100% {
    transform: translateY(-110vh) translateX(30px);
    opacity: 0;
  }
}

a {
  color: var(--glow-cyan);
  text-decoration: none;
  transition: all 0.15s ease;
}

a:hover {
  color: #67e8f9;
}

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

button {
  font-family: inherit;
  font-size: 1rem;
  border: none;
  background: none;
  cursor: pointer;
}

.nn-container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
  z-index: 1;
}

/* ================= HEADER (水族馆入口导览牌) ================= */
.nn-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(11, 10, 26, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--water-blue);
  box-shadow: 0 4px 16px rgba(5, 4, 13, 0.8);
}

.nn-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nn-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
}

.nn-logo__icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 6px rgba(34, 211, 238, 0.5));
}

.nn-logo__text {
  letter-spacing: 0.02em;
  display: flex;
  flex-direction: column;
}

.nn-logo__brand {
  color: var(--text-main);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.1;
}

.nn-logo__tagline {
  font-size: 0.68rem;
  color: var(--glow-cyan);
  letter-spacing: 0.08em;
  font-weight: 500;
}

.nn-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nn-nav__link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all 0.2s ease;
  position: relative;
}

.nn-nav__link::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  background-color: var(--water-blue);
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
  transition: all 0.2s ease;
}

.nn-nav__link:hover,
.nn-nav__link--active {
  color: var(--text-main);
  background-color: rgba(58, 110, 165, 0.2);
  border-color: rgba(34, 211, 238, 0.4);
}

.nn-nav__link:hover::before,
.nn-nav__link--active::before {
  background-color: var(--glow-cyan);
  box-shadow: 0 0 6px var(--glow-cyan);
}

/* Header 导览牌入口按钮 */
.nn-header__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  background-color: var(--accent-lime);
  color: #0B0A1A !important;
  font-size: 0.925rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 2px solid #05040d;
  box-shadow: 3px 3px 0px #05040d;
  transition: all 0.15s ease;
  min-height: 42px;
  line-height: 1;
}

.nn-header__cta:hover {
  background-color: var(--accent-lime-hover);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px #05040d;
}

.nn-header__cta:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px #05040d;
}

/* 汉堡按钮 */
.nn-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--water-blue);
}

.nn-burger__line {
  width: 22px;
  height: 2px;
  background-color: var(--text-main);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.nn-burger[aria-expanded="true"] .nn-burger__line:nth-child(2) {
  opacity: 0;
}

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

/* 移动端菜单抽屉 */
.nn-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background-color: rgba(11, 10, 26, 0.98);
  border-bottom: 2px solid var(--glow-purple);
  box-shadow: 0 10px 24px rgba(5, 4, 13, 0.9);
  padding: 24px 20px;
  flex-direction: column;
  gap: 14px;
  z-index: 99;
}

.nn-drawer.is-open {
  display: flex;
}

.nn-drawer__link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--water-blue);
}

/* ================= 赛璐璐风格按钮系统 ================= */
.nn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  padding: 12px 30px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  min-height: 48px;
  cursor: pointer;
  text-align: center;
  letter-spacing: 0.02em;
}

/* 唯一主要 CTA 强调色：青柠色 --accent-lime */
.nn-btn--primary {
  background-color: var(--accent-lime);
  color: #0B0A1A !important;
  border: 2px solid #05040d;
  box-shadow: var(--cel-shadow);
}

.nn-btn--primary:hover {
  background-color: var(--accent-lime-hover);
  transform: translate(-2px, -2px);
  box-shadow: var(--cel-shadow-card);
}

.nn-btn--primary:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px #05040d;
}

.nn-btn--secondary {
  background-color: rgba(58, 110, 165, 0.25);
  color: var(--text-main) !important;
  border: 2px solid var(--water-blue);
  box-shadow: var(--cel-shadow);
}

.nn-btn--secondary:hover {
  background-color: rgba(58, 110, 165, 0.45);
  border-color: var(--glow-cyan);
  color: var(--text-main) !important;
  transform: translate(-2px, -2px);
  box-shadow: var(--cel-shadow-card);
}

.nn-btn--block {
  width: 100%;
}

/* ================= HERO SECTION (主展缸玻璃视角 + 招牌动效：信号波纹) ================= */
.nn-hero {
  padding: 64px 0 72px;
  position: relative;
  overflow: hidden;
  border-bottom: 2px solid var(--water-blue);
  background: 
    radial-gradient(circle at 75% 50%, rgba(139, 92, 246, 0.15) 0%, transparent 60%),
    linear-gradient(180deg, rgba(11, 10, 26, 0.4) 0%, rgba(17, 16, 38, 0.8) 100%);
}

.nn-hero__layout {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 48px;
  align-items: center;
}

.nn-hero__content {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* 焦点物种铭牌 */
.nn-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background: rgba(58, 110, 165, 0.3);
  border: 1px solid var(--glow-cyan);
  border-radius: var(--radius-sm);
  color: var(--glow-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  width: fit-content;
  box-shadow: 2px 2px 0px #05040d;
}

.nn-hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--glow-cyan);
  box-shadow: 0 0 8px var(--glow-cyan);
}

.nn-hero__title {
  font-size: 3.25rem; /* 52px 规范 */
  font-weight: 700;
  line-height: 1.18;
  color: var(--text-main);
  letter-spacing: -0.01em;
  text-shadow: 0 0 20px rgba(139, 92, 246, 0.25);
}

.nn-hero__subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 580px;
}

.nn-hero__actions {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.nn-hero__trust {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 20px;
  border-top: 1px dashed rgba(58, 110, 165, 0.4);
  margin-top: 8px;
}

.nn-hero__trust-label {
  font-size: 0.8125rem; /* 13px 辅助规范 */
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nn-hero__trust-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nn-hero__trust-tag {
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 4px 12px;
  background-color: rgba(21, 19, 48, 0.7);
  border: 1px solid var(--water-blue);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  box-shadow: 2px 2px 0px #05040d;
}

/* 主展缸观察窗 (Hero 右侧赛璐璐平涂玻璃展缸视觉) */
.nn-tank-window {
  position: relative;
  background: linear-gradient(135deg, rgba(17, 16, 38, 0.9) 0%, rgba(11, 10, 26, 0.95) 100%);
  border: 2px solid var(--water-blue);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--cel-shadow-card), inset 0 0 24px rgba(34, 211, 238, 0.1);
  overflow: hidden;
}

/* 玻璃展缸边角卡框金属加固 */
.nn-tank-window::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 6px;
  width: 14px;
  height: 14px;
  border-top: 2px solid var(--glow-cyan);
  border-left: 2px solid var(--glow-cyan);
  pointer-events: none;
}

.nn-tank-window::after {
  content: "";
  position: absolute;
  bottom: 6px;
  right: 6px;
  width: 14px;
  height: 14px;
  border-bottom: 2px solid var(--glow-cyan);
  border-right: 2px solid var(--glow-cyan);
  pointer-events: none;
}

/* 【招牌动效】：信号波纹 (Hero 中心发出规律波纹，象征连接) */
.nn-signal-emitter {
  position: relative;
  width: 100%;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.nn-signal-core {
  width: 24px;
  height: 24px;
  background: radial-gradient(circle, var(--glow-cyan) 0%, var(--water-blue) 100%);
  border-radius: 50%;
  box-shadow: 0 0 16px var(--glow-cyan);
  position: relative;
  z-index: 3;
}

.nn-signal-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 24px;
  height: 24px;
  border: 2px solid var(--glow-cyan);
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  animation: nn-signal-pulse 2.5s infinite cubic-bezier(0.215, 0.61, 0.355, 1);
}

.nn-signal-ring:nth-child(2) {
  animation-delay: 0.8s;
  border-color: var(--glow-purple);
}

.nn-signal-ring:nth-child(3) {
  animation-delay: 1.6s;
  border-color: var(--water-blue);
}

@keyframes nn-signal-pulse {
  0% {
    width: 24px;
    height: 24px;
    opacity: 0.9;
    border-width: 3px;
  }
  100% {
    width: 240px;
    height: 240px;
    opacity: 0;
    border-width: 1px;
  }
}

.nn-signal-paused .nn-signal-ring {
  animation-play-state: paused;
}

.nn-tank-window__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(58, 110, 165, 0.4);
  padding-bottom: 12px;
  margin-bottom: 14px;
}

.nn-tank-window__label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nn-tank-window__status {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-lime);
  background: rgba(163, 230, 53, 0.15);
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid rgba(163, 230, 53, 0.3);
}

.nn-node-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nn-node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background-color: rgba(11, 10, 26, 0.7);
  border: 1px solid rgba(58, 110, 165, 0.4);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.nn-node-row:hover {
  border-color: var(--glow-cyan);
  transform: translateX(2px);
}

.nn-node-row__name {
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
}

.nn-node-row__ping {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--glow-cyan);
  background-color: rgba(34, 211, 238, 0.12);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(34, 211, 238, 0.25);
}

/* ================= SECTION 通用样式 (展缸结构) ================= */
.nn-section {
  padding: 80px 0;
  border-bottom: 2px solid var(--water-blue);
  position: relative;
}

.nn-section--alt {
  background-color: rgba(17, 16, 38, 0.55);
}

.nn-section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.nn-section__tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--glow-purple);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.nn-section__title {
  font-size: 1.75rem; /* 28px 规范 */
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.nn-section__desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================= 特性 (可收集的生物卡牌 - 4张) ================= */
.nn-features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.nn-bio-card {
  background: var(--bg-card);
  border: 2px solid var(--water-blue);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--cel-shadow-card);
  position: relative;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  overflow: hidden;
}

.nn-bio-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--cel-shadow-hover);
  border-color: var(--glow-cyan);
}

/* 卡牌右上角稀有度铭牌 */
.nn-bio-card__rarity {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: rgba(139, 92, 246, 0.2);
  border: 1px solid var(--glow-purple);
  color: var(--glow-purple);
  letter-spacing: 0.05em;
}

.nn-bio-card__rarity--ssr {
  background: rgba(34, 211, 238, 0.2);
  border-color: var(--glow-cyan);
  color: var(--glow-cyan);
}

.nn-bio-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background-color: rgba(58, 110, 165, 0.25);
  border: 1px solid var(--water-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--glow-cyan);
  box-shadow: 2px 2px 0px #05040d;
}

.nn-bio-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.nn-bio-card__text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= 流媒体支持 (深海高码率流媒体展厅 - 6款) ================= */
.nn-streaming-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.nn-stream-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  background-color: var(--bg-card);
  border: 2px solid rgba(58, 110, 165, 0.4);
  border-radius: var(--radius-md);
  box-shadow: var(--cel-shadow);
  transition: all 0.2s ease;
}

.nn-stream-card:hover {
  border-color: var(--glow-purple);
  transform: translateY(-2px);
  box-shadow: var(--cel-shadow-card);
}

.nn-stream-card__icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background-color: rgba(11, 10, 26, 0.8);
  border: 1px solid var(--water-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--glow-cyan);
}

.nn-stream-card__name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.nn-stream-card__meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ================= AI 工具支持 (深海智慧中枢 - 6款) ================= */
.nn-ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.nn-ai-card {
  padding: 24px;
  background-color: var(--bg-card);
  border: 2px solid rgba(58, 110, 165, 0.4);
  border-radius: var(--radius-md);
  box-shadow: var(--cel-shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all 0.2s ease;
}

.nn-ai-card:hover {
  border-color: var(--glow-cyan);
  transform: translateY(-2px);
  box-shadow: var(--cel-shadow-card);
}

.nn-ai-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nn-ai-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.nn-ai-card__badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  background-color: rgba(34, 211, 238, 0.15);
  color: var(--glow-cyan);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: var(--radius-sm);
}

.nn-ai-card__desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================= 使用场景 (不同深度的观测日志 - 3张) ================= */
.nn-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.nn-log-card {
  background: var(--bg-card);
  border: 2px solid var(--water-blue);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--cel-shadow-card);
  position: relative;
  transition: all 0.2s ease;
}

.nn-log-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--cel-shadow-hover);
  border-color: var(--glow-purple);
}

.nn-log-card__depth {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--glow-cyan);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.3);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  width: fit-content;
}

.nn-log-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.nn-log-card__desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= 定价 (水族馆年票卡牌：普通 / 银 / 金 - 推荐银阶) ================= */
.nn-pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  position: relative;
}

.nn-ticket-card {
  background-color: var(--bg-card);
  border: 2px solid var(--water-blue);
  border-radius: var(--radius-lg);
  padding: 40px 28px 32px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--cel-shadow-card);
  position: relative;
  transition: all 0.25s ease;
}

.nn-ticket-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--cel-shadow-hover);
}

/* 推荐档位：银阶卡牌 (视觉突出，配吉祥物小水母) */
.nn-ticket-card--popular {
  border-color: var(--glow-cyan);
  box-shadow: 0 0 0 2px var(--glow-cyan), var(--cel-shadow-card);
  background: linear-gradient(180deg, rgba(28, 25, 63, 0.95) 0%, rgba(17, 16, 38, 0.95) 100%);
  transform: translateY(-8px);
}

.nn-ticket-card--popular:hover {
  transform: translateY(-12px);
  box-shadow: 0 0 0 2px var(--glow-cyan), var(--cel-shadow-hover);
}

.nn-ticket-card__badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--glow-cyan);
  color: #0B0A1A;
  font-size: 0.8125rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-sm);
  border: 2px solid #05040d;
  box-shadow: 2px 2px 0px #05040d;
  white-space: nowrap;
}

/* 吉祥物：发光小水母（漂浮在定价卡旁） */
.nn-mascot-jellyfish {
  position: absolute;
  top: -48px;
  right: -24px;
  width: 60px;
  height: 60px;
  pointer-events: none;
  animation: nn-jellyfish-float 3.5s infinite ease-in-out;
  filter: drop-shadow(0 0 10px rgba(34, 211, 238, 0.7));
  z-index: 10;
}

@keyframes nn-jellyfish-float {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-10px) rotate(4deg);
  }
}

.nn-ticket-card__rarity {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--glow-purple);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.nn-ticket-card--popular .nn-ticket-card__rarity {
  color: var(--glow-cyan);
}

.nn-ticket-card__name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.nn-ticket-card__audience {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.nn-ticket-card__price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 26px;
  padding-bottom: 24px;
  border-bottom: 1px dashed rgba(58, 110, 165, 0.4);
}

.nn-ticket-card__currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
}

.nn-ticket-card__amount {
  font-size: 2.85rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.nn-ticket-card__period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.nn-ticket-card__features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.nn-ticket-card__feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.925rem;
  color: var(--text-main);
}

.nn-ticket-card__check-icon {
  width: 18px;
  height: 18px;
  color: var(--glow-cyan);
  flex-shrink: 0;
}

/* ================= FAQ (展缸说明牌 - 6问) ================= */
.nn-faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.nn-faq-card {
  background-color: var(--bg-card);
  border: 2px solid var(--water-blue);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--cel-shadow);
  transition: border-color 0.2s ease;
}

.nn-faq-card:hover {
  border-color: var(--glow-purple);
}

.nn-faq-card__btn {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 26px;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  background: none;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.nn-faq-card__btn:hover {
  background-color: rgba(58, 110, 165, 0.15);
}

.nn-faq-card__icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--glow-cyan);
  transition: transform 0.25s ease;
}

.nn-faq-card.is-open .nn-faq-card__icon {
  transform: rotate(180deg);
}

.nn-faq-card__content {
  display: none;
  padding: 0 26px 24px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px dashed rgba(58, 110, 165, 0.3);
}

.nn-faq-card.is-open .nn-faq-card__content {
  display: block;
}

/* ================= FINAL CTA (展缸闸门开启视觉) ================= */
.nn-final-gate {
  padding: 80px 0;
  border-bottom: 2px solid var(--water-blue);
  background: 
    radial-gradient(circle at 50% 50%, rgba(34, 211, 238, 0.12) 0%, transparent 70%),
    rgba(17, 16, 38, 0.85);
}

.nn-gate-box {
  background: var(--bg-card);
  border: 2px solid var(--glow-cyan);
  border-radius: var(--radius-lg);
  padding: 60px 36px;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
  box-shadow: var(--cel-shadow-hover), inset 0 0 30px rgba(34, 211, 238, 0.08);
  position: relative;
}

.nn-gate-box::before {
  content: "GATE // 01";
  position: absolute;
  top: 14px;
  left: 20px;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--glow-cyan);
  letter-spacing: 0.15em;
}

.nn-gate-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.nn-gate-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

/* ================= FOOTER (水族馆底部坐标与闭馆公告) ================= */
.nn-footer {
  background-color: #06050e;
  border-top: 2px solid var(--water-blue);
  padding: 52px 0 36px;
  margin-top: auto;
  position: relative;
  z-index: 10;
}

.nn-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.nn-footer__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(58, 110, 165, 0.3);
}

.nn-footer__nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.nn-footer__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.nn-footer__link:hover {
  color: var(--glow-cyan);
}

.nn-footer__bottom {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.8125rem; /* 13px 辅助规范 */
  color: var(--text-muted);
}

.nn-footer__disclosure {
  color: #64748b;
  font-size: 0.78rem;
}

/* ================= 移动端吸底 CTA ================= */
.nn-sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(11, 10, 26, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 2px solid var(--water-blue);
  padding: 12px 20px;
  box-shadow: 0 -4px 16px rgba(5, 4, 13, 0.8);
  display: none;
  z-index: 90;
  transform: translateY(100%);
  transition: transform 0.25s ease;
}

.nn-sticky-cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.nn-sticky-cta__text {
  display: flex;
  flex-direction: column;
}

.nn-sticky-cta__title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.nn-sticky-cta__desc {
  font-size: 0.775rem;
  color: var(--glow-cyan);
}

/* ================= 文章页 / 指南页 / 合规页样式 ================= */
.nn-page-header {
  padding: 52px 0 38px;
  background-color: rgba(17, 16, 38, 0.7);
  border-bottom: 2px solid var(--water-blue);
  margin-bottom: 44px;
}

.nn-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.nn-breadcrumb a {
  color: var(--text-muted);
}

.nn-breadcrumb a:hover {
  color: var(--glow-cyan);
}

.nn-page-title {
  font-size: 2.35rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 12px;
}

.nn-page-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem; /* 13px 辅助规范 */
  color: var(--text-muted);
}

/* 指南卡片网格 */
.nn-guides-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 64px;
}

.nn-guide-card {
  background-color: var(--bg-card);
  border: 2px solid var(--water-blue);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--cel-shadow-card);
  transition: all 0.2s ease;
}

.nn-guide-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--cel-shadow-hover);
  border-color: var(--glow-cyan);
}

.nn-guide-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.nn-guide-card__tag {
  background-color: rgba(139, 92, 246, 0.2);
  color: var(--glow-purple);
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(139, 92, 246, 0.4);
}

.nn-guide-card__title {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.4;
}

.nn-guide-card__title a {
  color: var(--text-main);
}

.nn-guide-card__title a:hover {
  color: var(--glow-cyan);
}

.nn-guide-card__desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex-grow: 1;
}

.nn-guide-card__link {
  font-weight: 700;
  font-size: 0.95rem;
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--glow-cyan);
}

/* 文章正文 */
.nn-article-layout {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 840px;
  margin: 0 auto 64px;
}

.nn-article-body {
  font-size: 1rem; /* 16px 正文规范 */
  color: var(--text-main);
  line-height: 1.8;
}

.nn-article-body p {
  margin-bottom: 22px;
}

.nn-article-body h2 {
  font-size: 1.75rem; /* 28px 规范 */
  font-weight: 600;
  color: var(--text-main);
  margin: 40px 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--water-blue);
}

.nn-article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--glow-cyan);
  margin: 26px 0 14px;
}

.nn-article-body ul, .nn-article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.nn-article-body li {
  margin-bottom: 10px;
}

.nn-article-callout {
  background-color: rgba(58, 110, 165, 0.2);
  border-left: 4px solid var(--glow-cyan);
  padding: 20px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
  font-size: 0.95rem;
  box-shadow: 2px 2px 0px #05040d;
}

.nn-article-callout strong {
  color: var(--glow-cyan);
}

.nn-article-cta-box {
  background: linear-gradient(135deg, rgba(21, 19, 48, 0.9) 0%, rgba(11, 10, 26, 0.95) 100%);
  border: 2px solid var(--glow-cyan);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  text-align: center;
  margin: 44px 0;
  box-shadow: var(--cel-shadow-card);
}

.nn-article-cta-box__title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.nn-article-cta-box__desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.nn-related-links {
  background-color: var(--bg-card);
  border: 2px solid var(--water-blue);
  border-radius: var(--radius-md);
  padding: 26px;
  margin-top: 44px;
  box-shadow: var(--cel-shadow);
}

.nn-related-links__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}

.nn-related-links__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 0;
}

.nn-related-links__item a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--glow-cyan);
}

.nn-related-links__item a::before {
  content: "▶";
  font-size: 0.75rem;
  color: var(--water-blue);
}

/* 网站地图 */
.nn-sitemap-group {
  margin-bottom: 40px;
}

.nn-sitemap-group__title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--water-blue);
  color: var(--glow-cyan);
}

.nn-sitemap-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 28px;
  padding-left: 0;
}

.nn-sitemap-item a {
  font-size: 1rem;
  color: var(--text-main);
}

.nn-sitemap-item a:hover {
  color: var(--glow-cyan);
}

/* ================= 响应式适配 ================= */
@media (max-width: 992px) {
  .nn-hero__layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .nn-tank-window {
    max-width: 560px;
  }
  .nn-hero__title {
    font-size: 2.5rem;
  }
  .nn-features-grid,
  .nn-streaming-grid,
  .nn-ai-grid,
  .nn-cases-grid,
  .nn-pricing-grid,
  .nn-guides-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nn-ticket-card--popular {
    order: -1;
    transform: none;
  }
  .nn-ticket-card--popular:hover {
    transform: translateY(-4px);
  }
}

@media (max-width: 768px) {
  .nn-nav, .nn-header__cta {
    display: none;
  }
  .nn-burger {
    display: flex;
  }
  .nn-hero__title {
    font-size: 2.1rem;
  }
  .nn-section__title {
    font-size: 1.55rem;
  }
  .nn-features-grid,
  .nn-streaming-grid,
  .nn-ai-grid,
  .nn-cases-grid,
  .nn-pricing-grid,
  .nn-guides-grid,
  .nn-sitemap-list {
    grid-template-columns: 1fr;
  }
  .nn-sticky-cta {
    display: block;
  }
  body {
    padding-bottom: 70px;
  }
  .nn-footer__top {
    flex-direction: column;
    align-items: flex-start;
  }
}

@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;
    scroll-behavior: auto !important;
  }
  .nn-bubble {
    display: none;
  }
  .nn-signal-ring {
    opacity: 0.5 !important;
    animation: none !important;
  }
  .nn-mascot-jellyfish {
    animation: none !important;
  }
}