/* CSS Variables */
:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-success: #10b981;
    --color-success-dark: #059669;
    --color-warning: #f59e0b;
    --color-warning-dark: #d97706;
    --color-danger: #ef4444;
    --color-danger-dark: #dc2626;
    --color-secondary: #6b7280;
    --color-secondary-dark: #4b5563;
    
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    --bg-card: #ffffff;
    --bg-hover: #f9fafb;
    --bg-muted: #f3f4f6;
    
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --text-white: #ffffff;
    
    --border-color: #e5e7eb;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-xs: 6px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.5;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius-xs);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-primary {
    background: var(--color-primary);
    color: var(--text-white);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-success {
    background: var(--color-success);
    color: var(--text-white);
}

.btn-success:hover {
    background: var(--color-success-dark);
}

.btn-warning {
    background: var(--color-warning);
    color: var(--text-primary);
}

.btn-warning:hover {
    background: var(--color-warning-dark);
}

.btn-danger {
    background: var(--color-danger);
    color: var(--text-white);
}

.btn-danger:hover {
    background: var(--color-danger-dark);
}

.btn-secondary {
    background: var(--color-secondary);
    color: var(--text-white);
}

.btn-secondary:hover {
    background: var(--color-secondary-dark);
}

.btn-icon {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 5px;
    border-radius: var(--border-radius-xs);
    transition: background var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-muted);
}

.btn-icon-left {
    font-size: 16px;
}

/* Landing Page */
.landing-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 40px);
}

.landing-card {
    background: var(--bg-card);
    padding: 60px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 600px;
}

.landing-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.landing-card h1 {
    font-size: 32px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.landing-description {
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 16px;
}

.usage-box {
    background: var(--bg-muted);
    padding: 20px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 30px;
}

.usage-box h3 {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.usage-box code {
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 14px;
    color: var(--text-primary);
}

.usage-box .highlight {
    color: var(--color-primary);
}

.features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    text-align: left;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: var(--bg-muted);
    border-radius: var(--border-radius-xs);
    font-size: 14px;
}

.feature-icon {
    font-size: 20px;
}

/* Inbox Container */
.inbox-container {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* Inbox Header */
.inbox-header {
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    padding: 25px 30px;
    color: var(--text-white);
}

.email-address {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 10px;
    word-break: break-all;
}

.url-display {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.15);
    padding: 10px 15px;
    border-radius: var(--border-radius-xs);
    font-size: 12px;
    font-family: 'SF Mono', 'Consolas', monospace;
}

.url-text {
    flex: 1;
    word-break: break-all;
    opacity: 0.9;
}

.url-display .btn-icon {
    color: var(--text-white);
}

.url-display .btn-icon:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Action Bar */
.action-bar {
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-muted);
}

.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

/* Stats Bar */
.stats-bar {
    display: flex;
    gap: 30px;
    padding: 15px 30px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-value.highlight {
    color: var(--color-primary);
}

/* Email List */
.email-list {
    max-height: 60vh;
    overflow-y: auto;
}

.email-item {
    padding: 18px 30px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.email-item:hover {
    background: var(--bg-hover);
}

.email-item.unread {
    background: #eef2ff;
    border-left: 4px solid var(--color-primary);
}

.email-item.unread:hover {
    background: #e0e7ff;
}

.email-item.expired {
    opacity: 0.6;
    background: #fee2e2;
}

.email-item.expired:hover {
    background: #fecaca;
}

.email-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.email-from {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.email-date {
    font-size: 12px;
    color: var(--text-muted);
}

.email-subject {
    font-size: 15px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.badge-new {
    display: inline-block;
    padding: 2px 8px;
    background: var(--color-success);
    color: var(--text-white);
    font-size: 10px;
    font-weight: 700;
    border-radius: 10px;
    text-transform: uppercase;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* Email View */
.email-view-container {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.back-bar {
    padding: 15px 25px;
    background: var(--bg-muted);
    border-bottom: 1px solid var(--border-color);
}

.email-view-header {
    padding: 25px;
    border-bottom: 1px solid var(--border-color);
}

.email-view-header .email-subject {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.email-meta-grid {
    display: grid;
    gap: 10px;
}

.meta-item {
    display: flex;
    gap: 10px;
}

.meta-label {
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 50px;
}

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

.codes-section {
    padding: 20px 25px;
    background: #fef3c7;
    border-bottom: 1px solid #fcd34d;
}

.codes-section h3 {
    font-size: 16px;
    margin-bottom: 15px;
}

.codes-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.code-box {
    background: var(--bg-card);
    border: 2px solid var(--color-warning);
    border-radius: var(--border-radius-sm);
    padding: 15px 25px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.code-box:hover {
    background: #fffbeb;
    transform: scale(1.02);
}

.code-box-totp {
    border-color: var(--color-primary);
    background: #f0f9ff;
}

.code-box-totp:hover {
    background: #e0f2fe;
}

.code-value {
    display: block;
    font-size: 24px;
    font-weight: 700;
    font-family: 'SF Mono', 'Consolas', monospace;
    letter-spacing: 3px;
    color: var(--text-primary);
    word-break: break-all;
}

.code-box-totp .code-value {
    font-size: 16px;
    letter-spacing: 1px;
}

.code-hint {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 5px;
}

.codes-note {
    margin-top: 15px;
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
}

.email-body {
    padding: 25px;
    min-height: 300px;
}

.email-html-content {
    line-height: 1.6;
}

.email-text-content {
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 14px;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.empty-content {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    display: none;
}

.modal-overlay.active {
    display: block;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.modal.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.modal-content {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 400px;
    max-width: 90vw;
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.modal-icon {
    font-size: 32px;
}

.modal-icon.warning {
    color: var(--color-warning);
}

.modal-header h3 {
    font-size: 20px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 25px;
}

/* Modal Codes */
#codes-content {
    text-align: center;
    padding: 20px 0;
}

#codes-content .codes-grid {
    justify-content: center;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 15px;
}

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

/* Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    z-index: 2000;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: var(--color-success);
    color: var(--text-white);
}

.toast.error {
    background: var(--color-danger);
    color: var(--text-white);
}

.toast.info {
    background: var(--color-primary);
    color: var(--text-white);
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        padding: 10px;
    }
    
    .landing-card {
        padding: 40px 25px;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .inbox-header {
        padding: 20px;
    }
    
    .email-address {
        font-size: 18px;
    }
    
    .action-bar,
    .stats-bar,
    .email-item {
        padding-left: 20px;
        padding-right: 20px;
    }
    
    .action-buttons {
        justify-content: center;
    }
    
    .btn {
        padding: 8px 14px;
        font-size: 13px;
    }
    
    .stats-bar {
        gap: 20px;
    }
    
    .stat-value {
        font-size: 20px;
    }
    
    .modal-content {
        min-width: auto;
        width: 90vw;
        padding: 20px;
    }
}

/* Scrollbar */
.email-list::-webkit-scrollbar {
    width: 8px;
}

.email-list::-webkit-scrollbar-track {
    background: var(--bg-muted);
}

.email-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.email-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}