:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --accent-hover: #79c0ff;
    --success-color: #3fb950;
    --error-color: #f85149;
    --warning-color: #d29922;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 30px;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.email-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
}

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

.email-address {
    flex: 1;
    min-width: 200px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px 20px;
    font-size: 1.2rem;
    font-family: 'SF Mono', 'Consolas', monospace;
    color: var(--accent-color);
    word-break: break-all;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-success {
    background-color: var(--success-color);
    color: var(--bg-primary);
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.inbox-section {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.inbox-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
}

.inbox-title {
    font-size: 1.2rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.message-count {
    background-color: var(--accent-color);
    color: var(--bg-primary);
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.refresh-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.refresh-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.inbox-list {
    max-height: 500px;
    overflow-y: auto;
}

.inbox-empty {
    padding: 50px 20px;
    text-align: center;
    color: var(--text-secondary);
}

.inbox-empty-icon {
    margin-bottom: 20px;
    color: var(--text-secondary);
    opacity: 0.5;
}

.inbox-empty-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.inbox-empty-desc {
    color: var(--text-secondary);
    margin-bottom: 25px;
    font-size: 1rem;
}

.waiting-info {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.1), rgba(63, 185, 80, 0.1));
    border: 1px solid rgba(88, 166, 255, 0.2);
    padding: 14px 24px;
    border-radius: 30px;
    margin-bottom: 25px;
    color: var(--accent-color);
    font-size: 0.95rem;
    font-weight: 500;
}

.waiting-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(88, 166, 255, 0.3);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.inbox-tips {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

.tip-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.tip-item svg {
    color: var(--success-color);
}

.message-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 18px 20px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s ease;
}

.message-item:last-child {
    border-bottom: none;
}

.message-item:hover {
    background-color: var(--bg-tertiary);
}

.message-item.active {
    background-color: rgba(88, 166, 255, 0.1);
    border-left: 3px solid var(--accent-color);
}

.message-avatar {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-color), #79c0ff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
    color: var(--bg-primary);
    flex-shrink: 0;
}

.message-content {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
    gap: 15px;
}

.message-from {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message-date {
    color: var(--text-secondary);
    font-size: 0.8rem;
    white-space: nowrap;
    background: var(--bg-tertiary);
    padding: 4px 10px;
    border-radius: 12px;
}

.message-subject {
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 6px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.95rem;
}

.message-preview {
    color: var(--text-secondary);
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    line-height: 1.4;
}

.message-arrow {
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: transform 0.2s;
}

.message-item:hover .message-arrow {
    transform: translateX(3px);
    color: var(--accent-color);
}

.message-view {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-top: 25px;
    overflow: hidden;
    display: none;
}

.message-view.active {
    display: block;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-view-header {
    padding: 25px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    color: var(--accent-color);
    font-size: 0.95rem;
    cursor: pointer;
    padding: 8px 0;
    margin-bottom: 20px;
    transition: all 0.2s;
}

.btn-back:hover {
    color: var(--accent-hover);
}

.btn-back:hover svg {
    transform: translateX(-3px);
}

.btn-back svg {
    transition: transform 0.2s;
}

.message-view-subject {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 20px;
    word-break: break-word;
    line-height: 1.4;
}

.message-view-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.meta-avatar {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--accent-color), #79c0ff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--bg-primary);
}

.meta-details {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.meta-from {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.meta-date {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.message-view-body {
    padding: 0;
    overflow-x: auto;
}

.message-view-body iframe {
    width: 100%;
    min-height: 400px;
    border: none;
    background-color: #fff;
}

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: var(--text-secondary);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 10px;
}

.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--success-color);
}

.toast.error {
    border-color: var(--error-color);
}

footer {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
    background: linear-gradient(180deg, transparent, rgba(88, 166, 255, 0.03));
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.footer-brand {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-color);
    margin: 0;
}

.footer-tagline {
    color: var(--text-secondary);
    margin: 0;
}

.footer-founder {
    margin-top: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-tertiary);
    border-radius: 30px;
    border: 1px solid var(--border-color);
}

.footer-founder span:first-child {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.founder-name {
    font-weight: 600;
    color: var(--accent-color);
    font-size: 0.95rem;
}

.api-card {
    background: linear-gradient(135deg, var(--bg-secondary), rgba(88, 166, 255, 0.05));
    border: 1px solid var(--border-color);
    border-radius: 16px;
    margin-top: 25px;
    overflow: hidden;
}

.api-card-header {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 25px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(88, 166, 255, 0.03);
    flex-wrap: wrap;
}

.api-card-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent-color), #79c0ff);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    flex-shrink: 0;
}

.api-card-title {
    flex: 1;
    min-width: 150px;
}

.api-card-title h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--text-primary);
    font-weight: 600;
}

.api-card-title p {
    margin: 5px 0 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.api-docs-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--accent-color), #79c0ff);
    color: var(--bg-primary);
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.3);
}

.api-docs-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.4);
}

.api-endpoints-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    padding: 20px;
}

.api-endpoint-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.api-endpoint-card:hover {
    border-color: var(--accent-color);
    transform: translateX(5px);
}

.api-method {
    padding: 6px 10px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.api-method.get {
    background: rgba(63, 185, 80, 0.15);
    color: var(--success-color);
    border: 1px solid rgba(63, 185, 80, 0.3);
}

.api-endpoint-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.api-endpoint-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.api-endpoint-info code {
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    header {
        padding: 25px 15px;
    }

    .logo {
        font-size: 1.8rem;
    }

    .email-display {
        flex-direction: column;
    }

    .email-address {
        width: 100%;
        font-size: 1rem;
        text-align: center;
    }

    .button-group {
        width: 100%;
        justify-content: center;
    }

    .btn {
        flex: 1;
        min-width: 120px;
    }

    .inbox-header {
        flex-direction: column;
        gap: 15px;
    }

    .message-item {
        flex-wrap: wrap;
    }

    .message-avatar {
        width: 40px;
        height: 40px;
        font-size: 0.9rem;
    }

    .message-arrow {
        display: none;
    }

    .message-view-subject {
        font-size: 1.2rem;
    }

    .waiting-info {
        flex-direction: column;
        gap: 10px;
        padding: 15px 20px;
    }

    .inbox-tips {
        flex-direction: column;
        align-items: center;
    }
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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