/* ========================================
   碎屑 - 构成主义风格个人博客 (重构版)
   ======================================== */

/* CSS Variables */
:root {
  --paper: #E3DED1;
  --red: #C62828;
  --black: #1A1A1A;
  --yellow: #FBC02D;
  --white: #FAFAFA;
  --gray: #8D8580;
  --grid-unit: 8px;

  /* 动画时间 */
  --transition-fast: 0.3s;
  --transition-medium: 0.6s;
  --transition-slow: 1.2s;
}

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

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

body {
  font-family: 'Inter', 'Noto Serif SC', serif;
  background-color: var(--paper);
  color: var(--black);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

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

/* ========================================
   SVG 定义
   ======================================== */
.svg-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

/* ========================================
   导航栏
   ======================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 3rem;
  background: var(--black);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, background 0.3s ease;
}

.nav-scrolled {
  background: rgba(26, 26, 26, 0.95);
  backdrop-filter: blur(10px);
}

.nav-geo-line {
  position: absolute;
  background: var(--red);
}

.nav-geo-line-1 {
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
}

.nav-logo {
  font-family: 'Archivo Black', 'Noto Serif SC', serif;
  font-size: 1.8rem;
  color: var(--white);
  display: inline-block;
  position: relative;
  z-index: 2;
}

.nav-logo::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--yellow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.nav-logo:hover::after {
  transform: scaleX(1);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  position: relative;
  z-index: 2;
}

.nav-link {
  color: var(--white);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  position: relative;
  padding: 0.5rem 0;
  transition: color var(--transition-fast);
}

.nav-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -10px;
  width: 3px;
  height: 0;
  background: var(--red);
  transition: height var(--transition-fast);
}

.nav-link:hover {
  color: var(--yellow);
}

.nav-link:hover::before {
  height: 100%;
}

.nav-geo-circle {
  position: absolute;
  right: 15%;
  top: 50%;
  transform: translateY(-50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 3px solid var(--red);
  opacity: 0.6;
  animation: pulse 3s ease-in-out infinite;
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: 60px;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(26, 26, 26, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(26, 26, 26, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* 几何装饰 */
.geo-circle {
  position: absolute;
  border-radius: 50%;
  opacity: 0;
  transform: scale(0) translateY(50px);
  transition: none;
}

.geo-circle.visible {
  animation: geoFloatIn 1.2s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.geo-circle-1 {
  width: clamp(200px, 30vw, 400px);
  height: clamp(200px, 30vw, 400px);
  background: var(--red);
  top: 15%;
  right: 10%;
  z-index: 1;
}

.geo-circle-2 {
  width: clamp(80px, 10vw, 150px);
  height: clamp(80px, 10vw, 150px);
  background: var(--yellow);
  bottom: 25%;
  left: 8%;
  z-index: 3;
}

.geo-rect {
  position: absolute;
  opacity: 0;
  transform: scale(0.8) rotate(var(--start-rot, 30deg)) translateY(30px);
  transition: none;
}

.geo-rect.visible {
  animation: geoRectIn 1s cubic-bezier(0.34, 1.2, 0.64, 1) forwards;
}

.geo-rect-1 {
  width: clamp(100px, 15vw, 200px);
  height: clamp(200px, 35vw, 450px);
  background: var(--yellow);
  top: 20%;
  left: 5%;
  transform: rotate(15deg);
  z-index: 2;
  --start-rot: 30deg;
}

.geo-rect-2 {
  width: clamp(80px, 12vw, 180px);
  height: clamp(120px, 20vw, 300px);
  background: var(--black);
  bottom: 15%;
  right: 15%;
  transform: rotate(-25deg);
  z-index: 2;
  --start-rot: -40deg;
}

/* SVG 几何线条 */
.geo-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  transition: opacity 1s ease 0.5s;
}

.geo-lines.visible {
  opacity: 1;
}

.geo-line {
  stroke: var(--black);
  stroke-width: 1;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  transition: stroke-dashoffset 1.5s ease-out;
}

.geo-lines.visible .geo-line-1 {
  stroke-dashoffset: 0;
  transition-delay: 0.6s;
}

.geo-lines.visible .geo-line-2 {
  stroke-dashoffset: 0;
  stroke: var(--red);
  stroke-width: 2;
  transition-delay: 0.9s;
}

.geo-lines.visible .geo-line-3 {
  stroke-dashoffset: 0;
  stroke: var(--yellow);
  stroke-width: 1.5;
  transition-delay: 1.2s;
}

/* 三角形装饰 */
.geo-triangle {
  position: absolute;
  bottom: 10%;
  right: 30%;
  width: 0;
  height: 0;
  border-left: 60px solid transparent;
  border-right: 60px solid transparent;
  border-bottom: 100px solid var(--red);
  opacity: 0;
  transform: translateY(50px) scale(0.5);
  transition: none;
  z-index: 4;
}

.geo-triangle.visible {
  animation: geoTriangleIn 0.8s cubic-bezier(0.34, 1.3, 0.64, 1) 1s forwards;
}

/* 十字装饰 */
.geo-cross {
  position: absolute;
  top: 30%;
  left: 25%;
  width: 40px;
  height: 40px;
  opacity: 0;
  transform: scale(0) rotate(-90deg);
  transition: none;
  z-index: 3;
}

.geo-cross.visible {
  animation: geoCrossIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.8s forwards;
}

.geo-cross::before,
.geo-cross::after {
  content: '';
  position: absolute;
  background: var(--black);
  top: 50%;
  left: 0;
  width: 100%;
  height: 3px;
}

.geo-cross::before {
  transform: translateY(-50%) rotate(0deg);
}

.geo-cross::after {
  transform: translateY(-50%) rotate(90deg);
}

/* Hero 内容 */
.hero-content {
  position: relative;
  z-index: 100;
  text-align: center;
}

.hero-title {
  font-family: 'ZCOOL XiaoWei', "Microsoft YaHei", sans-serif;
  font-size: clamp(6rem, 25vw, 18rem);
  font-weight: 900;
  line-height: 0.85;
  color: var(--black);
  position: relative;
  z-index: 50;
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s ease, transform 1.2s cubic-bezier(0.2, 1, 0.3, 1);
  letter-spacing: -0.05em;
}

.hero-title.visible {
  opacity: 1;
  transform: translateY(0);
}

.hero-title-line {
  display: inline-block;
  position: relative;
  z-index: 60;
  transition: transform 0.5s ease;
}

/* 让两个字产生错落感 */
.hero-title-line:nth-child(1) {
  transform: translateY(-0.1em);
}

.hero-title-line:nth-child(2) {
  transform: translateY(0.1em);
  color: var(--red);
}

/* 标题背后的白色块 */
.hero-title::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scaleX(0);
  width: 140%;
  height: 110%;
  background: #FFFFFF;
  z-index: -1;
  transition: transform 1.2s cubic-bezier(0.2, 1, 0.3, 1) 0.6s;
  box-shadow: 15px 15px 0px rgba(198, 40, 40, 0.2);
}

.hero-title.visible::before {
  transform: translate(-50%, -50%) scaleX(1);
}

.hero-subtitle {
  font-size: clamp(0.9rem, 1.5vw, 1.2rem);
  color: var(--black);
  margin-top: 3rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5em;
  background: var(--yellow);
  display: inline-block;
  padding: 5px 20px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.8s ease 1s;
}

.hero-subtitle.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   通用 Section 样式
   ======================================== */
.section {
  padding: 6rem 3rem;
  position: relative;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 4rem;
  position: relative;
}

.section-number {
  font-family: 'Archivo Black', sans-serif;
  font-size: 3rem;
  color: var(--red);
  opacity: 0.3;
  line-height: 1;
}

.section-title {
  font-family: 'ZCOOL XiaoWei', 'Noto Serif SC', serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  position: relative;
}

.section-title::before {
  content: '';
  position: absolute;
  left: -15px;
  top: 50%;
  width: 8px;
  height: 8px;
  background: var(--red);
  border-radius: 50%;
  transform: translateY(-50%);
}

.section-line {
  flex: 1;
  height: 2px;
  background: linear-gradient(to right, var(--black), transparent);
}

/* 几何进入按钮 */
.geo-enter-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--black);
  color: var(--yellow);
  font-size: 1.2rem;
  transform: rotate(0deg);
  transition: transform var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
  border: 2px solid var(--black);
}

.geo-enter-btn:hover {
  background: var(--red);
  color: var(--white);
  transform: rotate(-5deg);
}

/* ========================================
   SCINTILLA
   ======================================== */
.scintilla-section {
  background: var(--paper);
}

.scintilla-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.scintilla-item {
  background: var(--white);
  padding: 2rem;
  position: relative;
  border-left: 4px solid var(--red);
  transition: all var(--transition-fast);
  opacity: 0;
  animation: diaryIn 0.8s ease-out forwards;
  cursor: pointer;
}

.scintilla-item:nth-child(even) {
  border-left-color: var(--yellow);
}

.scintilla-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.scintilla-title {
  font-family: 'ZCOOL XiaoWei', 'Noto Serif SC', serif;
  font-size: 1.2rem;
  color: var(--black);
  margin-bottom: 0.5rem;
}

.scintilla-date {
  font-size: 0.8rem;
  color: var(--gray);
  margin-bottom: 0.5rem;
  display: block;
}

.scintilla-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--black);
}

.scintilla-tag {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--red);
  border: 1px solid var(--red);
  padding: 2px 8px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.scintilla-item:nth-child(even) .scintilla-tag {
  color: var(--yellow);
  border-color: var(--yellow);
}

.scintilla-geo-accent {
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  background: var(--red);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
  opacity: 0.1;
}

.scintilla-item:nth-child(even) .scintilla-geo-accent {
  background: var(--yellow);
}

/* ========================================
   内陆帝国
   ======================================== */
.inland-empire-section {
  background: var(--black);
  padding: 6rem 3rem;
}

.inland-empire-section .section-title {
  color: var(--white);
}

.inland-empire-section .section-number {
  color: var(--yellow);
}

.inland-empire-section .geo-enter-btn {
  background: var(--yellow);
  color: var(--black);
  border-color: var(--yellow);
}

.inland-empire-section .geo-enter-btn:hover {
  background: var(--red);
  color: var(--white);
  border-color: var(--red);
}

/* 多列瀑布流：图片比例完全自适应 */
.inland-empire-grid {
  column-count: 4;
  column-gap: 1rem;
}

.ie-item {
  break-inside: avoid;
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
  background: var(--paper);
  transform: rotate(0deg);
  transition: transform var(--transition-fast);
  cursor: pointer;
}

.ie-item:hover {
  transform: scale(1.02);
  z-index: 10;
}

.ie-item img {
  width: 100%;
  height: auto;
  display: block;
  max-width: 100%;
}

.ie-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.75rem;
  background: linear-gradient(to top, rgba(26, 26, 26, 0.9), transparent);
  color: var(--white);
  font-size: 0.85rem;
  transform: translateY(100%);
  transition: transform var(--transition-fast);
}

.ie-item:hover .ie-caption {
  transform: translateY(0);
}

.ie-item {
  cursor: pointer;
}

.ie-overlay {
  position: absolute;
  inset: 0;
  background: rgba(26,26,26,0.75);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
}

.ie-category {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  background: var(--yellow);
  color: var(--black);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   万有引力之虹
   ======================================== */
.gravity-rainbow-section {
  background: var(--paper);
  position: relative;
  overflow: hidden;
}

.gravity-rainbow-section::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 100%;
  background: var(--yellow);
  opacity: 0.1;
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.gravity-rainbow-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 3rem;
  position: relative;
  z-index: 1;
}

.gr-item {
  background: var(--white);
  padding: 2.5rem;
  position: relative;
  cursor: pointer;
  border-top: 4px solid var(--black);
  transition: all var(--transition-fast);
}

.gr-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.gr-geo-decor {
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: var(--red);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.gr-date {
  font-size: 0.8rem;
  color: var(--gray);
  margin-bottom: 0.5rem;
  display: block;
}

.gr-title {
  font-family: 'ZCOOL XiaoWei', 'Noto Serif SC', serif;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.gr-md-preview {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--gray);
}

.gr-item {
  cursor: pointer;
}

.gr-md-body {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 2px solid var(--paper);
}

.gr-md-full {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--black);
}

.gr-md-full h1,
.gr-md-full h2,
.gr-md-full h3 {
  color: var(--black);
  margin: 1.2rem 0 0.6rem;
}

.gr-md-full p {
  margin-bottom: 0.8rem;
}

.gr-md-content h1,
.gr-md-content h2,
.gr-md-content h3 {
  color: var(--black);
  margin: 1.2rem 0 0.6rem;
}

.gr-md-content p {
  margin-bottom: 0.8rem;
}

.gr-tags {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.gr-tag {
  font-size: 0.75rem;
  background: var(--paper);
  color: var(--black);
  padding: 2px 8px;
  border: 1px solid var(--black);
}

/* ========================================
   宣言区（原台词区）
   ======================================== */
.manifesto-section {
  background: var(--black);
  color: var(--white);
  position: relative;
  overflow: hidden;
  padding: 8rem 3rem;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.manifesto-bg-geo {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, var(--red) 0%, transparent 30%),
    radial-gradient(circle at 80% 70%, var(--yellow) 0%, transparent 25%);
  opacity: 0.1;
  animation: bgFloat 20s ease-in-out infinite;
  pointer-events: none;
}

.manifesto-quote {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  padding: 2rem;
  background: rgba(198, 40, 40, 0.08);
  border: 2px solid rgba(251, 192, 45, 0.2);
}

.manifesto-quote p {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  line-height: 1.8;
  color: var(--white);
  letter-spacing: 0.02em;
}

/* ========================================
   B-side 隐秘入口
   ======================================== */
.bside-trigger {
  position: absolute;
  bottom: 140px;
  right: 8%;
  z-index: 998;
  cursor: pointer;
  width: 24px;
  height: 24px;
}

.bside-shape {
  width: 100%;
  height: 100%;
  background: var(--red);
  animation: bsideEnter 0.8s ease-out forwards, bsideBlink 2.2s ease-in-out infinite 0.8s;
}

@keyframes bsideEnter {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.6);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes bsideBlink {
  0%, 100% {
    opacity: 0.35;
    box-shadow: 0 0 0 transparent;
  }
  50% {
    opacity: 1;
    box-shadow: 0 0 14px 2px var(--red);
  }
}

/* B-side 弹窗 */
.bside-modal {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 26, 0.85);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.bside-modal.active {
  display: flex;
}

.bside-panel {
  background: var(--paper);
  padding: 3rem;
  position: relative;
  border: 3px solid var(--black);
  max-width: 360px;
  width: 90%;
  text-align: center;
}

.bside-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--black);
}

.bside-hint {
  font-family: 'Archivo Black', sans-serif;
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  color: var(--red);
  letter-spacing: 0.1em;
}

.bside-input {
  width: 100%;
  padding: 0.8rem;
  font-size: 1.2rem;
  text-align: center;
  letter-spacing: 0.5em;
  border: 2px solid var(--black);
  background: var(--white);
  color: var(--black);
  margin-bottom: 0.5rem;
  outline: none;
}

.bside-input:focus {
  border-color: var(--red);
}

.bside-hint-small {
  font-size: 0.8rem;
  color: var(--gray);
  margin-bottom: 1.5rem;
}

.bside-submit {
  background: var(--black);
  color: var(--yellow);
  border: none;
  padding: 0.8rem 2rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.bside-submit:hover {
  background: var(--red);
  color: var(--white);
}

/* B-side 解锁后展示 */
.bside-reveal {
  display: none;
  padding: 4rem 3rem;
  background: var(--black);
  color: var(--white);
  position: relative;
}

.bside-reveal.active {
  display: block;
}

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

.bside-reveal-title {
  font-family: 'Archivo Black', sans-serif;
  font-size: 2rem;
  color: var(--red);
  margin-bottom: 2rem;
  letter-spacing: 0.1em;
}

.bside-list {
  display: grid;
  gap: 1.5rem;
}

.bside-entry {
  background: rgba(255,255,255,0.05);
  padding: 1.5rem;
  border-left: 3px solid var(--yellow);
}

.bside-entry-date {
  font-size: 0.8rem;
  color: var(--yellow);
  margin-bottom: 0.5rem;
  display: block;
}

.bside-archive-link {
  display: inline-block;
  margin-top: 2rem;
  color: var(--yellow);
  border: 2px solid var(--yellow);
  padding: 0.5rem 1.2rem;
  font-weight: 700;
  transition: all var(--transition-fast);
}

.bside-archive-link:hover {
  background: var(--yellow);
  color: var(--black);
}

/* ========================================
   午夜电台 BGM 播放器
   ======================================== */
.bgm-player {
  position: fixed;
  bottom: 1.5rem;
  left: 1.5rem;
  z-index: 999;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--black);
  padding: 0.6rem 1rem;
  border: 2px solid var(--yellow);
  animation: bgmEnter 0.6s ease-out both;
}

@keyframes bgmEnter {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

.bgm-toggle {
  width: 36px;
  height: 36px;
  background: var(--yellow);
  border: none;
  color: var(--black);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-fast);
}

.bgm-toggle:hover {
  background: var(--red);
  color: var(--white);
}

.bgm-volume {
  -webkit-appearance: none;
  appearance: none;
  width: 80px;
  height: 4px;
  background: rgba(251, 192, 45, 0.3);
  outline: none;
  cursor: pointer;
}

.bgm-volume::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  background: var(--yellow);
  border: 2px solid var(--black);
  cursor: pointer;
}

.bgm-volume::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--yellow);
  border: 2px solid var(--black);
  cursor: pointer;
}

.bgm-label {
  color: var(--white);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  white-space: nowrap;
  font-family: 'Inter', sans-serif;
}

/* ========================================
   管理员模式
   ======================================== */
.admin-fab {
  display: none;
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1500;
  width: 56px;
  height: 56px;
  background: var(--red);
  color: var(--white);
  font-size: 2rem;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 3px solid var(--white);
  transition: transform var(--transition-fast);
}

.admin-fab:hover {
  transform: rotate(90deg) scale(1.1);
}

.admin-modal {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 26, 0.9);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  padding: 2rem;
}

.admin-modal.active {
  display: flex;
}

.admin-panel {
  background: var(--paper);
  border: 3px solid var(--black);
  max-width: 720px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2rem;
  position: relative;
}

.admin-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--black);
}

.admin-title {
  font-family: 'Archivo Black', sans-serif;
  font-size: 1.2rem;
  color: var(--red);
  margin-bottom: 1.5rem;
  letter-spacing: 0.1em;
}

.admin-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.admin-tab {
  background: var(--black);
  color: var(--white);
  border: none;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.admin-tab.active,
.admin-tab:hover {
  background: var(--red);
}

.admin-tab-bside {
  animation: bsideTabBlink 2.5s ease-in-out infinite;
}

.admin-tab-bside:hover,
.admin-tab-bside.active {
  animation: none;
  background: var(--red);
}

@keyframes bsideTabBlink {
  0%, 100% {
    opacity: 0.45;
    box-shadow: 0 0 0 transparent;
  }
  50% {
    opacity: 1;
    box-shadow: 0 0 12px 2px rgba(198, 40, 40, 0.6);
  }
}

.admin-forms {
  margin-bottom: 1.5rem;
}

.admin-form {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
}

.admin-form.active {
  display: flex;
}

.admin-input,
.admin-textarea,
.admin-select {
  padding: 0.6rem;
  border: 2px solid var(--black);
  background: var(--white);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
}

.admin-input:focus,
.admin-textarea:focus,
.admin-select:focus {
  border-color: var(--red);
}

.admin-textarea {
  min-height: 120px;
  resize: vertical;
}

.admin-submit {
  background: var(--black);
  color: var(--yellow);
  border: none;
  padding: 0.7rem 1.5rem;
  font-weight: 700;
  cursor: pointer;
  align-self: flex-start;
  transition: background var(--transition-fast);
}

.admin-submit:hover {
  background: var(--red);
  color: var(--white);
}

.admin-list {
  border-top: 2px solid var(--black);
  padding-top: 1rem;
}

.admin-list-title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.admin-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(26,26,26,0.15);
  font-size: 0.85rem;
}

.admin-list-item button {
  background: none;
  border: 1px solid var(--red);
  color: var(--red);
  padding: 2px 10px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.admin-list-item button:hover {
  background: var(--red);
  color: var(--white);
}

/* ========================================
   归档页样式（SPA 内置）
   ======================================== */
.archive-page {
  min-height: 100vh;
  padding: 6rem 3rem 3rem;
  background: var(--paper);
}

.archive-page-dark {
  background: var(--black);
  color: var(--white);
}

.archive-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--black);
}

.archive-page-dark .archive-nav {
  border-bottom-color: var(--yellow);
}

.archive-nav-back {
  font-weight: 700;
  color: var(--red);
  transition: color var(--transition-fast);
}

.archive-nav-back:hover {
  color: var(--yellow);
}

.archive-nav-title {
  font-family: 'Archivo Black', sans-serif;
  font-size: 1.2rem;
  letter-spacing: 0.1em;
}

.archive-empty {
  color: var(--gray);
  font-size: 1.1rem;
}

/* 归档页 SCINTILLA - 按日期分组 */
.archive-date-group {
  margin-bottom: 2.5rem;
}

.archive-date-heading {
  font-family: 'Archivo Black', sans-serif;
  font-size: 0.85rem;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  border-bottom: 2px solid var(--black);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.archive-page-dark .archive-date-heading {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

.archive-sci-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.archive-sci-item {
  background: var(--white);
  padding: 1.5rem;
  border-left: 4px solid var(--red);
  position: relative;
  transition: transform var(--transition-fast);
  cursor: pointer;
}

.archive-sci-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.archive-sci-item:nth-child(even) {
  border-left-color: var(--yellow);
}

.archive-sci-date {
  font-size: 0.75rem;
  color: var(--gray);
  margin-bottom: 0.5rem;
  display: block;
}

.archive-sci-text {
  font-size: 1rem;
  line-height: 1.8;
}

.archive-sci-tag {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--red);
  border: 1px solid var(--red);
  padding: 2px 8px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.archive-sci-item:nth-child(even) .archive-sci-tag {
  color: var(--yellow);
  border-color: var(--yellow);
}

/* 归档页 inland-empire - 按日期分组 */
.archive-ie-grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.archive-ie-date-group {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.archive-ie-item {
  break-inside: avoid;
  margin-bottom: 0;
  position: relative;
  overflow: hidden;
  background: var(--white);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.archive-ie-item:hover {
  transform: scale(1.02);
}

.archive-ie-item img {
  width: 100%;
  height: auto;
  display: block;
}

.archive-ie-category {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  background: var(--yellow);
  color: var(--black);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  text-transform: uppercase;
}

.archive-ie-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.75rem;
  background: linear-gradient(to top, rgba(26,26,26,0.9), transparent);
  color: var(--white);
  font-size: 0.85rem;
  transform: translateY(100%);
  transition: transform var(--transition-fast);
}

.archive-ie-item:hover .archive-ie-caption {
  transform: translateY(0);
}

@media (max-width: 1024px) { .archive-ie-date-group { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) { .archive-ie-date-group { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .archive-ie-date-group { grid-template-columns: 1fr; } }

/* 归档页 gravity-rainbow - 按日期分组 */
.archive-gr-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  max-width: 900px;
}

.archive-gr-item {
  background: var(--white);
  padding: 2rem;
  border-top: 4px solid var(--black);
  position: relative;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.archive-gr-item:hover {
  transform: translateY(-4px);
}

.archive-gr-date {
  font-size: 0.75rem;
  color: var(--gray);
  margin-bottom: 0.5rem;
  display: block;
}

.archive-gr-title {
  font-family: 'ZCOOL XiaoWei', 'Noto Serif SC', serif;
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.archive-gr-tags {
  margin-bottom: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.archive-gr-tag {
  font-size: 0.75rem;
  background: var(--paper);
  color: var(--black);
  padding: 2px 8px;
  border: 1px solid var(--black);
}

.archive-gr-md {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--black);
}

.archive-gr-md h1,
.archive-gr-md h2,
.archive-gr-md h3 {
  color: var(--black);
  margin: 1.2rem 0 0.6rem;
}

.archive-gr-md p {
  margin-bottom: 0.8rem;
}

.archive-gr-md pre {
  background: var(--black);
  color: var(--white);
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
}

.archive-gr-md code {
  background: rgba(26,26,26,0.08);
  padding: 2px 5px;
  font-family: 'Courier New', monospace;
}

/* 归档页 B-side - 按日期分组 */
.archive-bs-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.archive-bs-item {
  background: rgba(255,255,255,0.05);
  padding: 1.5rem;
  border-left: 3px solid var(--yellow);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.archive-bs-item:hover {
  transform: translateX(4px);
}

.archive-bs-item p {
  color: var(--white);
  line-height: 1.8;
}

.archive-bs-date {
  font-size: 0.75rem;
  color: var(--yellow);
  margin-bottom: 0.5rem;
  display: block;
}

.archive-bs-lock {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40vh;
}

.archive-bs-lock-panel {
  background: var(--paper);
  padding: 3rem;
  border: 3px solid var(--black);
  text-align: center;
  max-width: 360px;
  width: 90%;
}

.archive-bs-lock-panel h3 {
  font-family: 'Archivo Black', sans-serif;
  color: var(--red);
  margin-bottom: 1.5rem;
  letter-spacing: 0.1em;
}

.archive-bs-lock-panel input {
  width: 100%;
  padding: 0.8rem;
  font-size: 1.2rem;
  text-align: center;
  letter-spacing: 0.5em;
  border: 2px solid var(--black);
  background: var(--white);
  margin-bottom: 0.5rem;
  outline: none;
}

.archive-bs-lock-panel input:focus {
  border-color: var(--red);
}

.archive-bs-hint {
  font-size: 0.8rem;
  color: var(--gray);
  margin-bottom: 1.5rem;
}

.archive-bs-lock-panel button {
  background: var(--black);
  color: var(--yellow);
  border: none;
  padding: 0.8rem 2rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  cursor: pointer;
}

.archive-bs-lock-panel button:hover {
  background: var(--red);
  color: var(--white);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--red);
  color: var(--white);
  padding: 4rem 3rem;
  position: relative;
  overflow: hidden;
}

.footer-geo-line {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--yellow);
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-title {
  font-family: 'ZCOOL XiaoWei', 'Noto Serif SC', serif;
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.footer-link {
  font-weight: 700;
  padding: 0.5rem 1rem;
  border: 2px solid var(--white);
  transition: all var(--transition-fast);
}

.footer-link:hover {
  background: var(--white);
  color: var(--red);
}

.footer-divider {
  display: none;
}

.footer-copy {
  font-size: 0.8rem;
  opacity: 0.6;
}

/* ========================================
   动画定义
   ======================================== */

/* 几何圆形弹性进入 */
@keyframes geoFloatIn {
  0% {
    opacity: 0;
    transform: scale(0) translateY(80px);
  }
  50% {
    opacity: 1;
    transform: scale(1.15) translateY(-15px);
  }
  75% {
    transform: scale(0.95) translateY(5px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* 几何矩形弹性进入 */
@keyframes geoRectIn {
  0% {
    opacity: 0;
    transform: scale(0.7) rotate(25deg) translateY(40px);
  }
  60% {
    opacity: 1;
    transform: scale(1.05) rotate(-3deg) translateY(-8px);
  }
  80% {
    transform: scale(0.98) rotate(2deg) translateY(3px);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotate(0deg) translateY(0);
  }
}

/* 三角形弹性进入 */
@keyframes geoTriangleIn {
  0% {
    opacity: 0;
    transform: translateY(60px) scale(0.3);
  }
  60% {
    opacity: 0.9;
    transform: translateY(-12px) scale(1.1);
  }
  100% {
    opacity: 0.8;
    transform: translateY(0) scale(1);
  }
}

/* 十字弹性进入 */
@keyframes geoCrossIn {
  0% {
    opacity: 0;
    transform: scale(0) rotate(-180deg);
  }
  50% {
    opacity: 1;
    transform: scale(1.3) rotate(10deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
}

/* 日记卡片进入 - 更柔和的弹性效果 */
@keyframes diaryIn {
  0% {
    opacity: 0;
    transform: translateY(50px) rotate(-3deg);
  }
  60% {
    opacity: 1;
    transform: translateY(-10px) rotate(1deg);
  }
  80% {
    transform: translateY(5px) rotate(-0.5deg);
  }
  100% {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
  }
}

/* 淡入动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 脉冲动画 */
@keyframes pulse {
  0%, 100% {
    transform: translateY(-50%) scale(1);
    opacity: 0.6;
  }
  50% {
    transform: translateY(-50%) scale(1.1);
    opacity: 0.3;
  }
}

/* 背景浮动 */
@keyframes bgFloat {
  0%, 100% {
    transform: translate(0, 0) rotate(0deg);
  }
  25% {
    transform: translate(2%, 2%) rotate(1deg);
  }
  50% {
    transform: translate(0, 4%) rotate(0deg);
  }
  75% {
    transform: translate(-2%, 2%) rotate(-1deg);
  }
}

/* 悬停时的轻微浮动 */
@keyframes gentleFloat {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-6px) rotate(0.5deg);
  }
}

/* 悬停时几何元素轻微弹跳 */
@keyframes geoBounce {
  0%, 100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-10px) scale(1.02);
  }
}

/* ========================================
   响应式设计
   ======================================== */

/* Tablet */
@media (max-width: 1024px) {
  .nav {
    padding: 1rem 1.5rem;
  }

  .nav-logo {
    font-size: 1.4rem;
  }

  .nav-links {
    gap: 1.5rem;
  }

  .nav-geo-circle {
    display: none;
  }

  .hero-vertical-text {
    display: none;
  }

  .inland-empire-grid {
    column-count: 3;
  }

  .archive-ie-grid {
    column-count: 3;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-link {
    font-size: 0.8rem;
  }

  .section {
    padding: 4rem 1.5rem;
  }

  .hero {
    min-height: 80vh;
  }

  .geo-circle-1 {
    width: 150px;
    height: 150px;
    top: 10%;
    right: 5%;
  }

  .geo-rect-1 {
    width: 80px;
    height: 200px;
    left: 2%;
  }

  .geo-rect-2 {
    width: 60px;
    height: 150px;
  }

  .geo-triangle {
    border-left-width: 40px;
    border-right-width: 40px;
    border-bottom-width: 70px;
  }

  .scintilla-grid {
    grid-template-columns: 1fr;
  }

  .inland-empire-grid {
    column-count: 2;
  }

  .gravity-rainbow-container {
    grid-template-columns: 1fr;
  }

  .archive-ie-grid {
    column-count: 2;
  }

  .footer-links {
    flex-direction: column;
    gap: 0.5rem;
  }

  .bgm-player {
    bottom: 1rem;
    left: 1rem;
    padding: 0.5rem 0.75rem;
  }

  .bgm-label {
    display: none;
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .nav {
    position: relative;
  }

  .hero {
    padding-top: 120px;
  }

  .hero-title {
    font-size: 4rem;
  }

  .section-number {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .inland-empire-grid {
    column-count: 1;
  }

  .archive-ie-grid {
    column-count: 1;
  }
}

/* ========================================
   滚动条美化
   ======================================== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--paper);
}

::-webkit-scrollbar-thumb {
  background: var(--black);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--red);
}

/* ========================================
   选中文字样式
   ======================================== */
::selection {
  background: var(--red);
  color: var(--white);
}