/* ============================================
   图片压缩工具 - 深色专业主题
   ============================================ */

/* ---------- 字体导入 ---------- */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=DM+Sans:wght@400;500;600&display=swap');

/* ---------- CSS 变量 ---------- */
:root {
  /* 主背景层次 */
  --bg-base: #08080c;
  --bg-surface: #0f0f14;
  --bg-elevated: #16161e;
  --bg-hover: #1e1e28;

  /* 强调色 */
  --accent-primary: #00d4aa;
  --accent-primary-dim: rgba(0, 212, 170, 0.15);
  --accent-primary-glow: rgba(0, 212, 170, 0.4);
  --accent-secondary: #8b5cf6;
  --accent-secondary-dim: rgba(139, 92, 246, 0.15);

  /* 文字层次 */
  --text-primary: #f0f0f5;
  --text-secondary: #8888a0;
  --text-muted: #55556a;
  --text-accent: #00d4aa;

  /* 边框 */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(255, 255, 255, 0.18);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(0, 212, 170, 0.15);

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 动画 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 背景渐变光晕 */
body::before {
  content: '';
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 140%;
  height: 60%;
  background: radial-gradient(
    ellipse at center,
    rgba(0, 212, 170, 0.06) 0%,
    rgba(139, 92, 246, 0.04) 40%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

/* 噪点纹理 */
body::after {
  content: '';
  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='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ---------- 容器布局 ---------- */
.container {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 48px 32px 64px;
}

/* ---------- 头部 ---------- */
header {
  text-align: center;
  margin-bottom: 56px;
  animation: fadeInDown 0.6s var(--ease-out) both;
}

header .logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--accent-primary-dim), var(--accent-secondary-dim));
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
  transition: transform 0.4s var(--ease-spring), box-shadow 0.4s;
}

header .logo:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-glow);
}

header .logo svg {
  width: 36px;
  height: 36px;
  color: var(--accent-primary);
}

header h1 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 12px;
  background: linear-gradient(135deg, #ffffff 0%, #a0a0b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header .subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* ---------- 上传区域 ---------- */
.upload-area {
  position: relative;
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-xl);
  padding: 72px 40px;
  text-align: center;
  cursor: pointer;
  transition: all 0.4s var(--ease-out);
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
  margin-bottom: 32px;
  overflow: hidden;
  animation: fadeInUp 0.6s var(--ease-out) 0.1s both;
}

.upload-area::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, var(--accent-primary-dim) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.4s;
}

.upload-area:hover {
  border-color: var(--accent-primary);
  background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--bg-hover) 100%);
}

.upload-area:hover::before {
  opacity: 1;
}

.upload-area.drag-over {
  border-color: var(--accent-primary);
  border-style: solid;
  background: var(--bg-hover);
  transform: scale(1.01);
  box-shadow: var(--shadow-glow), inset 0 0 60px var(--accent-primary-dim);
}

.upload-area.drag-over::before {
  opacity: 1;
}

.upload-content {
  position: relative;
  z-index: 1;
}

.upload-icon-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: 24px;
}

.upload-icon {
  width: 80px;
  height: 80px;
  background: var(--bg-hover);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s var(--ease-spring), background 0.3s, border-color 0.3s;
}

.upload-area:hover .upload-icon,
.upload-area.drag-over .upload-icon {
  transform: translateY(-6px);
  background: var(--accent-primary-dim);
  border-color: var(--accent-primary);
}

.upload-icon svg {
  width: 36px;
  height: 36px;
  color: var(--text-secondary);
  transition: color 0.3s, transform 0.4s var(--ease-spring);
}

.upload-area:hover .upload-icon svg,
.upload-area.drag-over .upload-icon svg {
  color: var(--accent-primary);
  transform: scale(1.1);
}

/* 上传图标周围的动画圆圈 */
.upload-icon-wrapper::after {
  content: '';
  position: absolute;
  inset: -12px;
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-lg);
  opacity: 0;
  animation: pulse-ring 2s ease-out infinite;
}

.upload-area:hover .upload-icon-wrapper::after {
  opacity: 1;
}

.upload-content p {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.15rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.upload-content p strong {
  color: var(--accent-primary);
  font-weight: 600;
}

.upload-content .hint {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.upload-content .hint svg {
  width: 14px;
  height: 14px;
}

/* ---------- 设置区域 ---------- */
.settings-section {
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px 36px;
  margin-bottom: 32px;
  animation: fadeInUp 0.6s var(--ease-out) 0.2s both;
}

.settings-section h2 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.settings-section h2::before {
  content: '';
  width: 4px;
  height: 18px;
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 2px;
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-group label svg {
  width: 16px;
  height: 16px;
  color: var(--accent-primary);
}

.form-group input[type="number"],
.form-group select {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-base);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  transition: all 0.3s;
  -moz-appearance: textfield;
}

.form-group input[type="number"]::-webkit-inner-spin-button,
.form-group input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.form-group input[type="number"]:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-dim);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%238888a0' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form-group select option {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

/* 复选框 */
.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-base);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s;
}

.checkbox-wrapper:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

.checkbox-wrapper input[type="checkbox"] {
  display: none;
}

.checkbox-custom {
  width: 22px;
  height: 22px;
  border: 2px solid var(--border-default);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s var(--ease-spring);
  flex-shrink: 0;
}

.checkbox-wrapper input[type="checkbox"]:checked + .checkbox-custom {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: scale(1.05);
}

.checkbox-custom svg {
  width: 14px;
  height: 14px;
  color: var(--bg-base);
  opacity: 0;
  transform: scale(0.5);
  transition: all 0.2s var(--ease-spring);
}

.checkbox-wrapper input[type="checkbox"]:checked + .checkbox-custom svg {
  opacity: 1;
  transform: scale(1);
}

.checkbox-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  user-select: none;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 36px;
  border: none;
  border-radius: var(--radius-md);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.4s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s var(--ease-spring);
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s;
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary) 0%, #00b894 100%);
  color: var(--bg-base);
  box-shadow: 0 4px 20px rgba(0, 212, 170, 0.3);
  width: 100%;
  margin-top: 8px;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 170, 0.4);
}

.btn-primary:hover svg {
  transform: translateX(4px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-success {
  background: linear-gradient(135deg, var(--accent-primary) 0%, #00b894 100%);
  color: var(--bg-base);
  box-shadow: 0 4px 20px rgba(0, 212, 170, 0.3);
  width: 100%;
  margin-top: 16px;
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 170, 0.4);
}

.btn-success:hover svg {
  transform: translateY(-2px);
}

.btn-success:active {
  transform: translateY(0);
}

.btn-success:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* ---------- 结果区域 ---------- */
.result-section {
  margin-top: 8px;
  animation: fadeInUp 0.6s var(--ease-out) 0.3s both;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.result-header h2 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.result-header h2::before {
  content: '';
  width: 4px;
  height: 18px;
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 2px;
}

.compression-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--accent-primary-dim);
  border: 1px solid rgba(0, 212, 170, 0.3);
  border-radius: 100px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.compression-badge svg {
  width: 14px;
  height: 14px;
}

/* 预览卡片网格 */
.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.preview-card {
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 24px;
  transition: all 0.4s var(--ease-out);
}

.preview-card:first-child {
  border-color: var(--border-default);
}

.preview-card:last-child {
  border-color: rgba(0, 212, 170, 0.2);
  background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(0, 212, 170, 0.03) 100%);
}

.preview-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.preview-card:last-child:hover {
  box-shadow: var(--shadow-glow), var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.card-header-icon {
  width: 32px;
  height: 32px;
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-header-icon svg {
  width: 18px;
  height: 18px;
  color: var(--text-secondary);
}

.preview-card:last-child .card-header-icon {
  background: var(--accent-primary-dim);
}

.preview-card:last-child .card-header-icon svg {
  color: var(--accent-primary);
}

.preview-card h3 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* 图片预览 */
.preview-image-wrapper {
  position: relative;
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-image-wrapper img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.preview-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.preview-placeholder svg {
  width: 32px;
  height: 32px;
  opacity: 0.5;
}

/* 图片信息 */
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.info-item {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.info-item.full-width {
  grid-column: 1 / -1;
}

.info-item label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.info-item span {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-all;
}

.preview-card:last-child .info-item span {
  color: var(--accent-primary);
}

/* 节省信息 */
.saving-highlight {
  background: var(--accent-primary-dim) !important;
  border-color: rgba(0, 212, 170, 0.3) !important;
}

.saving-highlight span {
  color: var(--accent-primary) !important;
  font-size: 1.1rem !important;
}

/* ---------- 消息提示 ---------- */
.message {
  margin-top: 24px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  display: none;
  align-items: center;
  gap: 12px;
  animation: fadeInUp 0.4s var(--ease-out);
}

.message.show {
  display: flex;
}

.message svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.message.info {
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: #a78bfa;
}

.message.success {
  background: var(--accent-primary-dim);
  border: 1px solid rgba(0, 212, 170, 0.3);
  color: var(--accent-primary);
}

.message.error {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: #f87171;
}

/* ---------- 加载状态 ---------- */
.loading {
  position: fixed;
  inset: 0;
  background: rgba(8, 8, 12, 0.85);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

.loading.show {
  opacity: 1;
  visibility: visible;
}

.loading-content {
  text-align: center;
}

.loading-spinner {
  width: 72px;
  height: 72px;
  position: relative;
  margin: 0 auto 28px;
}

.loading-spinner::before,
.loading-spinner::after {
  content: '';
  position: absolute;
  border-radius: 50%;
}

.loading-spinner::before {
  inset: 0;
  border: 3px solid var(--border-default);
}

.loading-spinner::after {
  inset: 0;
  border: 3px solid transparent;
  border-top-color: var(--accent-primary);
  animation: spin 1s linear infinite;
}

.loading-spinner-inner {
  position: absolute;
  inset: 8px;
  background: linear-gradient(135deg, var(--accent-primary-dim), var(--accent-secondary-dim));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.loading-spinner-inner svg {
  width: 28px;
  height: 28px;
  color: var(--accent-primary);
  animation: spin-reverse 2s linear infinite;
}

.loading p {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.loading span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes spin-reverse {
  to {
    transform: rotate(-360deg);
  }
}

@keyframes pulse-ring {
  0% {
    transform: scale(1);
    opacity: 0.5;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.2;
  }
  100% {
    transform: scale(1);
    opacity: 0.5;
  }
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .container {
    padding: 32px 20px 48px;
  }

  header {
    margin-bottom: 40px;
  }

  header h1 {
    font-size: 1.8rem;
  }

  header .logo {
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
  }

  header .logo svg {
    width: 28px;
    height: 28px;
  }

  .upload-area {
    padding: 48px 24px;
  }

  .upload-icon {
    width: 64px;
    height: 64px;
  }

  .upload-icon svg {
    width: 28px;
    height: 28px;
  }

  .settings-section {
    padding: 24px;
  }

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

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

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

  .result-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .btn {
    padding: 14px 24px;
  }
}