/* ==================== CSS Variables ==================== */
:root {
  /* Colors */
  --color-bg: #0a0a0f;
  --color-bg-card: rgba(255, 255, 255, 0.03);
  --color-bg-card-hover: rgba(255, 255, 255, 0.06);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);
  --color-text: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.6);
  --color-text-hint: rgba(255, 255, 255, 0.4);
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-success: #10b981;
  --color-error: #ef4444;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
  
  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.05);
  --shadow-glow: 0 0 60px rgba(99, 102, 241, 0.3);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== Reset & Base ==================== */
*, *::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: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ==================== Background Effects ==================== */
.background-effects {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: float 20s ease-in-out infinite;
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4) 0%, transparent 70%);
  top: -200px;
  left: -200px;
  animation-delay: 0s;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
  top: 50%;
  right: -150px;
  animation-delay: -7s;
}

.orb-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(217, 70, 239, 0.3) 0%, transparent 70%);
  bottom: -100px;
  left: 30%;
  animation-delay: -14s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -30px) scale(1.05); }
  50% { transform: translate(-20px, 20px) scale(0.95); }
  75% { transform: translate(20px, 30px) scale(1.02); }
}

/* ==================== Layout ==================== */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==================== Header ==================== */
.header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  padding-top: var(--spacing-xl);
}

.logo {
  font-size: 2.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-icon {
  font-size: 2rem;
  -webkit-text-fill-color: initial;
}

.tagline {
  color: var(--color-text-secondary);
  margin-top: var(--spacing-sm);
  font-size: 1rem;
  letter-spacing: 0.5px;
}

/* ==================== Main Content ==================== */
.main {
  flex: 1;
}

/* ==================== Settings Card (密钥设置) ==================== */
.settings-card {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  overflow: hidden;
  transition: var(--transition-normal);
}

.settings-card:hover {
  border-color: var(--color-border-hover);
}

.settings-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: var(--transition-fast);
}

.settings-header:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.02);
}

.settings-icon {
  font-size: 1.1rem;
}

.settings-arrow {
  margin-left: auto;
  font-size: 0.75rem;
  transition: transform var(--transition-fast);
}

.settings-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.settings-hint {
  font-size: 0.875rem;
  color: var(--color-text-hint);
  margin-bottom: var(--spacing-md);
  padding-top: var(--spacing-md);
}

.secret-input-group {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.secret-input-group input {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  font-size: 0.9rem;
  font-family: 'Monaco', 'Consolas', monospace;
  transition: var(--transition-fast);
}

.secret-input-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: rgba(99, 102, 241, 0.1);
}

.secret-input-group input::placeholder {
  color: var(--color-text-hint);
}

.toggle-visibility-btn {
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition-fast);
}

.toggle-visibility-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-border-hover);
}

.settings-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.save-secret-btn,
.clear-secret-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.save-secret-btn {
  background: var(--gradient-primary);
  color: white;
}

.save-secret-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.clear-secret-btn {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.clear-secret-btn:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--color-error);
}

.secret-status {
  font-size: 0.8rem;
  margin-top: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  text-align: center;
}

.secret-status.has-secret {
  color: var(--color-success);
  background: rgba(16, 185, 129, 0.1);
}

.secret-status.no-secret {
  color: var(--color-text-hint);
  background: rgba(255, 255, 255, 0.03);
}

.secret-status.message-success {
  color: var(--color-success);
  background: rgba(16, 185, 129, 0.15);
}

.secret-status.message-warning {
  color: #f59e0b;
  background: rgba(245, 158, 11, 0.15);
}

.secret-status.message-info {
  color: var(--color-primary-light);
  background: rgba(99, 102, 241, 0.15);
}

/* ==================== Upload Card ==================== */
.upload-card {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-card);
  transition: var(--transition-normal);
}

.upload-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  text-align: center;
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition-normal);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--color-primary);
  background: rgba(99, 102, 241, 0.05);
}

.upload-zone.dragover::before {
  opacity: 0.05;
}

.upload-zone > * {
  position: relative;
  z-index: 1;
}

.upload-icon {
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-md);
  transition: var(--transition-normal);
}

.upload-zone:hover .upload-icon {
  transform: translateY(-4px);
}

.upload-text {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.upload-hint {
  font-size: 0.875rem;
  color: var(--color-text-hint);
}

.paste-hint {
  margin-top: var(--spacing-sm);
  color: var(--color-text-secondary);
}

/* ==================== Progress ==================== */
.progress-container {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background: rgba(99, 102, 241, 0.1);
  border-radius: var(--radius-md);
}

.progress-bar {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 3px;
  width: 0%;
  transition: width 200ms ease;
}

.progress-text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-align: center;
  margin-top: var(--spacing-sm);
}

/* ==================== Results Section ==================== */
.results-section {
  margin-top: var(--spacing-xl);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* ==================== Result Item ==================== */
.result-item {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  display: flex;
  gap: var(--spacing-md);
  animation: slideIn 0.3s ease forwards;
  opacity: 0;
  transform: translateY(10px);
}

@keyframes slideIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-preview {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.05);
}

.result-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-normal);
}

.result-preview:hover img {
  transform: scale(1.05);
}

.result-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.result-filename {
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.result-url {
  display: flex;
  gap: var(--spacing-xs);
}

.result-url input {
  flex: 1;
  min-width: 0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--color-text-secondary);
  font-size: 0.813rem;
  font-family: 'Monaco', 'Consolas', monospace;
}

.result-url input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.copy-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.copy-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

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

.copy-btn.copied {
  background: var(--color-success);
}

.result-size {
  font-size: 0.75rem;
  color: var(--color-text-hint);
  margin-top: var(--spacing-xs);
}

/* ==================== Footer ==================== */
.footer {
  text-align: center;
  padding: var(--spacing-xl) 0;
  margin-top: auto;
  color: var(--color-text-hint);
  font-size: 0.875rem;
}

.footer a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: var(--transition-fast);
}

.footer a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ==================== Responsive ==================== */
@media (max-width: 640px) {
  .container {
    padding: var(--spacing-md);
  }
  
  .logo {
    font-size: 2rem;
  }
  
  .upload-zone {
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .result-item {
    flex-direction: column;
  }
  
  .result-preview {
    width: 100%;
    height: 120px;
  }
  
  .result-url {
    flex-direction: column;
  }
  
  .copy-btn {
    width: 100%;
    padding: var(--spacing-sm);
  }
}

/* ==================== Error state ==================== */
.error-message {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--color-error);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  text-align: center;
  animation: shake 0.5s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}