/* ========================================
   CSS 变量定义 - 新中式奢华配色
   ======================================== */
:root {
  /* 主色调 - 深邃的中国红 */
  --color-primary: #c41e3a;
  --color-primary-dark: #8b1428;
  --color-primary-light: #e85a5a;
  --color-primary-glow: rgba(196, 30, 58, 0.4);

  /* 金色点缀 - 金箔质感 */
  --color-gold: #d4a853;
  --color-gold-dark: #b8862f;
  --color-gold-light: #f0d78c;
  --color-gold-bright: #ffd700;
  --color-gold-glow: rgba(212, 168, 83, 0.3);

  /* 背景色 - 温暖纸质感 */
  --color-bg: #fff8f0;
  --color-bg-dark: #1a1210;
  --color-bg-pattern: rgba(212, 168, 83, 0.03);
  --color-card: #ffffff;
  --color-card-glass: rgba(255, 255, 255, 0.85);

  /* 文字色 */
  --color-text: #2a1a1a;
  --color-text-light: #5a4a4a;
  --color-text-muted: #8a7a7a;

  /* 边框和阴影 */
  --color-border: rgba(212, 168, 83, 0.15);
  --color-border-gold: rgba(212, 168, 83, 0.3);
  --shadow-sm: 0 2px 8px rgba(196, 30, 58, 0.08);
  --shadow-md: 0 8px 24px rgba(196, 30, 58, 0.12);
  --shadow-lg: 0 16px 48px rgba(196, 30, 58, 0.18);
  --shadow-gold: 0 4px 20px var(--color-gold-glow);
  --shadow-inset: inset 0 1px 3px rgba(0, 0, 0, 0.1);

  /* 圆角 */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;

  /* 过渡 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体 */
  --font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* ========================================
   基础重置
   ======================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

/* 纸质纹理背景 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      var(--color-bg-pattern) 2px,
      var(--color-bg-pattern) 4px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 2px,
      var(--color-bg-pattern) 2px,
      var(--color-bg-pattern) 4px
    );
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* 装饰性中式图案 - 左上角 */
body::after {
  content: "";
  position: fixed;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--color-gold-glow) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(-30px, 30px) rotate(90deg); }
  50% { transform: translate(0, 50px) rotate(180deg); }
  75% { transform: translate(30px, 30px) rotate(270deg); }
}

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

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

/* ========================================
   通用容器
   ======================================== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

/* ========================================
   头部 - 金箔渐变效果
   ======================================== */
.header {
  background:
    linear-gradient(135deg,
      var(--color-primary) 0%,
      var(--color-primary-dark) 50%,
      var(--color-primary) 100%
    );
  color: white;
  padding: 48px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(196, 30, 58, 0.3);
}

/* 动态光泽效果 */
.header::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -100%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    120deg,
    transparent 0%,
    transparent 40%,
    rgba(255, 215, 0, 0.15) 45%,
    rgba(255, 215, 0, 0.25) 50%,
    rgba(255, 215, 0, 0.15) 55%,
    transparent 60%,
    transparent 100%
  );
  animation: shimmer 8s linear infinite;
  pointer-events: none;
}

/* 金色装饰线 */
.header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-gold-bright) 20%,
    var(--color-gold) 50%,
    var(--color-gold-bright) 80%,
    transparent 100%
  );
  box-shadow: 0 0 20px var(--color-gold-glow);
}

@keyframes shimmer {
  0% { transform: translateX(0); }
  100% { transform: translateX(50%); }
}

.logo {
  font-size: 2.25rem;
  font-weight: 900;
  margin-bottom: 12px;
  position: relative;
  letter-spacing: 0.5px;
  text-shadow:
    0 2px 10px rgba(0, 0, 0, 0.3),
    0 0 30px var(--color-gold-glow);
  animation: glow-pulse 3s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% { text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3), 0 0 30px var(--color-gold-glow); }
  50% { text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3), 0 0 50px var(--color-gold-bright); }
}

.tagline {
  font-size: 1rem;
  opacity: 0.95;
  position: relative;
  font-weight: 500;
  letter-spacing: 2px;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* ========================================
   主内容区
   ======================================== */
.main {
  flex: 1;
  padding: 48px 0 64px;
  position: relative;
  z-index: 1;
}

/* ========================================
   壁纸网格 - 响应式瀑布流
   ======================================== */
.wallpaper-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media (min-width: 640px) {
  .wallpaper-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .wallpaper-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }
}

/* ========================================
   壁纸卡片 - 玻璃态 + 3D 效果
   ======================================== */
.wallpaper-card {
  background: var(--color-card-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow:
    var(--shadow-sm),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-border-gold);
  transform-style: preserve-3d;
  perspective: 1000px;
}

.wallpaper-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    135deg,
    transparent 0%,
    rgba(212, 168, 83, 0.1) 45%,
    rgba(255, 215, 0, 0.2) 50%,
    rgba(212, 168, 83, 0.1) 55%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

.wallpaper-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow:
    var(--shadow-lg),
    var(--shadow-gold),
    inset 0 1px 0 rgba(255, 255, 255, 1);
  border-color: var(--color-gold);
}

.wallpaper-card:hover::before {
  opacity: 1;
  animation: shine 1.5s ease-in-out;
}

@keyframes shine {
  0% { transform: translate(-100%, -100%) rotate(0deg); }
  100% { transform: translate(100%, 100%) rotate(45deg); }
}

/* 悬停提示 */
.wallpaper-card::after {
  content: "✨ 点击预览";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(
    to top,
    rgba(196, 30, 58, 0.95) 0%,
    rgba(196, 30, 58, 0.85) 50%,
    transparent 100%
  );
  color: white;
  padding: 32px 16px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
  backdrop-filter: blur(8px);
  letter-spacing: 1px;
}

.wallpaper-card:hover::after {
  opacity: 1;
}

.wallpaper-image {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: linear-gradient(
    135deg,
    #f5f5f5 0%,
    #e8e8e8 25%,
    #f5f5f5 50%,
    #e8e8e8 75%,
    #f5f5f5 100%
  );
  background-size: 400% 400%;
  animation: loading-gradient 2s ease infinite;
  transition: transform var(--transition-slow);
}

@keyframes loading-gradient {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.wallpaper-card:hover .wallpaper-image {
  transform: scale(1.05);
}

.wallpaper-image.loaded {
  animation: none;
}

/* ========================================
   加载状态 - 中式旋转效果
   ======================================== */
.loading {
  text-align: center;
  padding: 64px 0;
  color: var(--color-text-muted);
}

.loading.hidden {
  display: none;
}

.loading-spinner {
  width: 56px;
  height: 56px;
  border: 4px solid transparent;
  border-top-color: var(--color-primary);
  border-right-color: var(--color-gold);
  border-bottom-color: var(--color-primary);
  border-left-color: var(--color-gold);
  border-radius: 50%;
  margin: 0 auto 20px;
  animation: spin-elegant 1.5s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
  box-shadow:
    0 0 20px var(--color-primary-glow),
    inset 0 0 10px rgba(212, 168, 83, 0.2);
  position: relative;
}

.loading-spinner::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  background: var(--color-gold-bright);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 15px var(--color-gold-glow);
}

@keyframes spin-elegant {
  0% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(180deg) scale(1.1); }
  100% { transform: rotate(360deg) scale(1); }
}

/* ========================================
   弹窗通用样式 - 高级模糊效果
   ======================================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 18, 16, 0.75);
  backdrop-filter: blur(12px) saturate(150%);
  animation: overlay-in 0.4s ease;
}

@keyframes overlay-in {
  from {
    opacity: 0;
    backdrop-filter: blur(0px) saturate(100%);
  }
  to {
    opacity: 1;
    backdrop-filter: blur(12px) saturate(150%);
  }
}

.modal-content {
  position: relative;
  background: var(--color-card);
  border-radius: var(--radius-lg);
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
  animation: modal-scale-in 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow:
    0 24px 64px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(212, 168, 83, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

@keyframes modal-scale-in {
  0% {
    opacity: 0;
    transform: scale(0.8) translateY(30px) rotateX(10deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0) rotateX(0deg);
  }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.8));
  color: white;
  font-size: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: all var(--transition-fast);
  border: 2px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.modal-close:hover {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-color: var(--color-gold);
  transform: rotate(90deg) scale(1.1);
  box-shadow:
    0 6px 20px rgba(196, 30, 58, 0.4),
    0 0 30px var(--color-gold-glow);
}

/* ========================================
   预览弹窗 - 精致展示
   ======================================== */
.preview-content {
  padding: 0;
  background: transparent;
  text-align: center;
  box-shadow: none;
}

.preview-image {
  max-width: 85vw;
  max-height: 70vh;
  border-radius: var(--radius-lg);
  box-shadow:
    0 32px 64px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(212, 168, 83, 0.5),
    0 0 60px rgba(212, 168, 83, 0.2);
  border: 3px solid rgba(255, 255, 255, 0.9);
  animation: image-reveal 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes image-reveal {
  0% {
    opacity: 0;
    transform: scale(0.9) rotateY(-15deg);
    filter: blur(10px);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotateY(0deg);
    filter: blur(0px);
  }
}

.preview-info {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.95) 0%,
    rgba(255, 248, 240, 0.98) 100%
  );
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  margin-top: 20px;
  box-shadow:
    var(--shadow-lg),
    inset 0 1px 0 rgba(255, 255, 255, 1);
  border: 1px solid var(--color-border-gold);
  backdrop-filter: blur(20px);
  animation: info-slide-up 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s both;
}

@keyframes info-slide-up {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.preview-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
  letter-spacing: 0.5px;
}

.preview-info p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
  font-weight: 500;
}

/* ========================================
   密码弹窗 - 奢华设计
   ======================================== */
.password-content {
  width: 420px;
  max-width: 90vw;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.98) 0%,
    rgba(255, 248, 240, 1) 100%
  );
  border: 2px solid var(--color-border-gold);
  position: relative;
  overflow: hidden;
}

.password-content::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    var(--color-gold) 50%,
    var(--color-primary) 100%
  );
  background-size: 200% 100%;
  animation: gradient-flow 3s linear infinite;
}

@keyframes gradient-flow {
  0% { background-position: 0% 0%; }
  100% { background-position: 200% 0%; }
}

.password-box {
  padding: 40px 32px;
  text-align: center;
  position: relative;
}

.password-box h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--color-text);
  letter-spacing: 0.5px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.password-hint {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: 28px;
  line-height: 1.6;
  font-weight: 500;
}

.password-input {
  width: 100%;
  padding: 16px 20px;
  border: 2px solid var(--color-border-gold);
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  text-align: center;
  transition: all var(--transition-fast);
  background: rgba(255, 255, 255, 0.8);
  font-weight: 600;
  letter-spacing: 2px;
  box-shadow: var(--shadow-inset);
}

.password-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: white;
  box-shadow:
    0 0 0 4px rgba(196, 30, 58, 0.1),
    var(--shadow-inset);
  transform: scale(1.02);
}

.password-input::placeholder {
  letter-spacing: normal;
  font-weight: 400;
}

.password-error {
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 12px;
  min-height: 24px;
  animation: shake 0.5s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

/* ========================================
   按钮 - 金箔渐变效果
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 32px;
  border-radius: var(--radius-sm);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  border: none;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-dark) 50%,
    var(--color-primary) 100%
  );
  background-size: 200% 100%;
  color: white;
  box-shadow:
    var(--shadow-md),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 215, 0, 0.3);
}

.btn-primary::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, rgba(255, 215, 0, 0.4), transparent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow:
    0 12px 32px rgba(196, 30, 58, 0.4),
    0 0 40px var(--color-gold-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  background-position: 100% 0;
  border-color: var(--color-gold-bright);
}

.btn-primary:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary:active {
  transform: translateY(-1px);
  box-shadow:
    0 6px 16px rgba(196, 30, 58, 0.3),
    inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn-full {
  width: 100%;
  margin-top: 20px;
}

.btn-icon {
  font-size: 1.25rem;
  animation: bounce-icon 2s ease-in-out infinite;
}

@keyframes bounce-icon {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

/* ========================================
   底部 - 优雅收尾
   ======================================== */
.footer {
  background: linear-gradient(
    to bottom,
    var(--color-bg-dark) 0%,
    #0f0a08 100%
  );
  color: rgba(255, 255, 255, 0.7);
  padding: 32px 0;
  text-align: center;
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(212, 168, 83, 0.2);
  box-shadow: inset 0 1px 0 rgba(212, 168, 83, 0.1);
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-gold) 50%,
    transparent 100%
  );
  opacity: 0.6;
}

.footer p {
  position: relative;
  z-index: 1;
  font-weight: 500;
  letter-spacing: 0.5px;
}

/* ========================================
   工具类
   ======================================== */
.hidden {
  display: none !important;
}

/* ========================================
   响应式优化
   ======================================== */
@media (max-width: 640px) {
  .logo {
    font-size: 1.75rem;
  }

  .header {
    padding: 36px 0;
  }

  .main {
    padding: 32px 0 48px;
  }

  .preview-image {
    max-width: 92vw;
    max-height: 65vh;
  }

  .preview-info {
    padding: 20px 24px;
  }

  .password-box {
    padding: 32px 24px;
  }
}

/* ========================================
   滚动条美化
   ======================================== */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(
    to bottom,
    var(--color-primary) 0%,
    var(--color-gold) 100%
  );
  border-radius: 6px;
  border: 2px solid var(--color-bg);
  transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(
    to bottom,
    var(--color-primary-dark) 0%,
    var(--color-gold-dark) 100%
  );
  box-shadow: 0 0 10px var(--color-gold-glow);
}

/* ========================================
   性能优化 - 硬件加速
   ======================================== */
.wallpaper-card,
.modal-content,
.preview-image,
.btn-primary {
  will-change: transform;
  transform: translateZ(0);
  backface-visibility: hidden;
}