:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    
    /* Light Theme */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f3f5;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;
    --border-color: #e9ecef;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --text-tertiary: #6c757d;
    --border-color: #2d3748;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

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

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 400px;
    background: var(--primary-gradient);
    opacity: 0.1;
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-2xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* Buttons */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.btn-icon:hover {
    background-color: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

/* Cards */
.card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

/* Main Content */
.main-content {
    display: grid;
    gap: var(--spacing-xl);
}

/* Email Section */
.email-section h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
}

.email-display {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.email-address {
    flex: 1;
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.email-address::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transition: left 0.5s;
}

.email-address:hover::before {
    left: 100%;
}

.loading-text {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

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

.email-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.info-item svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

/* Inbox Section */
.inbox-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.inbox-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.inbox-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.email-count {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-tertiary);
    animation: pulse-dot 2s ease-in-out infinite;
}

.status-indicator.active .status-dot {
    background-color: #10b981;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-text {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    font-weight: 500;
}

.inbox-content {
    min-height: 400px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    text-align: center;
    min-height: 400px;
}

.empty-state svg {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.empty-state p {
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
}

/* Email List */
.email-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.email-item {
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.email-item:hover {
    background: var(--bg-primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.email-item-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-sm);
}

.email-from {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.email-time {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.email-subject {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.email-preview {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    animation: fadeIn var(--transition-base);
}

.modal.active {
    display: flex;
}

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

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--transition-base);
    border: 1px solid var(--border-color);
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: transparent;
    box-shadow: none;
}

.modal-close:hover {
    background: var(--bg-tertiary);
}

.modal-body {
    padding: var(--spacing-xl);
    overflow-y: auto;
    max-height: calc(90vh - 100px);
}

.email-meta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.meta-item {
    display: flex;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.meta-item strong {
    color: var(--text-secondary);
    min-width: 60px;
}

.meta-item span {
    color: var(--text-primary);
}

.email-body {
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    line-height: 1.8;
    word-wrap: break-word;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .header {
        margin-bottom: var(--spacing-xl);
    }
    
    .logo h1 {
        font-size: var(--font-size-xl);
    }
    
    .email-display {
        flex-direction: column;
    }
    
    .email-address {
        font-size: var(--font-size-base);
    }
    
    .inbox-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .inbox-stats {
        width: 100%;
        justify-content: space-between;
    }
    
    .modal-content {
        margin: var(--spacing-md);
    }
}

/* Animations */
@keyframes slideInUp {
    from {
        transform: translateY(10px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.email-item {
    animation: slideInUp var(--transition-base);
}

/* Copy notification */
.copy-notification {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    background: var(--primary-gradient);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideInUp var(--transition-base);
    z-index: 1001;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: var(--radius-sm);
}

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