:root {
    --primary: #1E88E5;
    --primary-hover: #1976D2;
    --primary-light: #64B5F6;
    --secondary: #455A64;
    --secondary-hover: #37474F;
    --accent: #00C853;
    --warning: #FF9800;
    --danger: #F44336;
    --bg-primary: #121212;
    --bg-secondary: #1E1E1E;
    --bg-tertiary: #2D2D2D;
    --bg-hover: #383838;
    --text-primary: #FFFFFF;
    --text-secondary: #B0BEC5;
    --text-tertiary: #78909C;
    --border-color: #424242;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-height: 100vh;
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

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

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
    filter: drop-shadow(0 2px 8px rgba(30, 136, 229, 0.3));
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.refresh-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.refresh-btn:hover {
    background: var(--primary);
    color: var(--text-primary);
    transform: rotate(180deg);
    border-color: var(--primary);
}

.refresh-btn svg {
    width: 20px;
    height: 20px;
}

.search-bar {
    display: flex;
    gap: 12px;
    align-items: center;
}

.search-wrapper {
    flex: 1;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 12px 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-family: var(--font-body);
    transition: var(--transition);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.15);
}

.search-clear {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border: none;
    background: var(--bg-hover);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.search-clear:hover {
    background: var(--danger);
    color: var(--text-primary);
}

.search-clear svg {
    width: 14px;
    height: 14px;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.filter-btn:hover {
    background: var(--primary);
    color: var(--text-primary);
    border-color: var(--primary);
}

.filter-btn svg {
    width: 18px;
    height: 18px;
}

.filter-panel {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-top: 16px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.filter-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-row label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-row input {
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

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

.filter-row input[type="date"] {
    color-scheme: dark;
}

.filter-actions {
    grid-column: span 2;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 8px;
}

.btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-secondary:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(30, 136, 229, 0.3);
}

.main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

.email-list-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    max-width: 100%;
    overflow: hidden;
}

.email-list-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.email-count {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

.email-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.email-list::-webkit-scrollbar {
    width: 6px;
}

.email-list::-webkit-scrollbar-track {
    background: transparent;
}

.email-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

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

.email-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.email-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: transparent;
    transition: var(--transition);
}

.email-item:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: translateX(4px);
}

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

.email-item.active {
    background: var(--bg-hover);
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(30, 136, 229, 0.2);
}

.email-item.active::before {
    background: var(--primary);
}

.email-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.email-sender {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.sender-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9375rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sender-email {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.email-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
}

.email-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    white-space: nowrap;
}

.spam-badge {
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 10px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.spam-badge.safe {
    background: rgba(0, 200, 83, 0.15);
    color: var(--accent);
}

.spam-badge.low {
    background: rgba(255, 152, 0, 0.15);
    color: var(--warning);
}

.spam-badge.high {
    background: rgba(244, 67, 54, 0.15);
    color: var(--danger);
}

.email-subject {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.email-preview {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.email-attachments-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 8px;
    font-size: 0.75rem;
    color: var(--primary-light);
}

.email-attachments-indicator svg {
    width: 14px;
    height: 14px;
}

.loading-state,
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-tertiary);
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

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

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    color: var(--text-tertiary);
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.empty-state span {
    font-size: 0.875rem;
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.page-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.page-btn:hover:not(:disabled) {
    background: var(--primary);
    color: var(--text-primary);
    border-color: var(--primary);
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-btn svg {
    width: 16px;
    height: 16px;
}

.page-info {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.email-detail-container {
    flex: 1.5;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    max-width: 100%;
    overflow: hidden;
}

.detail-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.back-btn:hover {
    background: var(--primary);
    color: var(--text-primary);
    border-color: var(--primary);
}

.back-btn svg {
    width: 18px;
    height: 18px;
}

.detail-actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.action-btn:hover {
    background: var(--primary);
    color: var(--text-primary);
    border-color: var(--primary);
}

.action-btn svg {
    width: 18px;
    height: 18px;
}

.email-detail {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.email-detail::-webkit-scrollbar {
    width: 6px;
}

.email-detail::-webkit-scrollbar-track {
    background: transparent;
}

.email-detail::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.detail-meta {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.meta-row {
    display: flex;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.meta-row:last-child {
    border-bottom: none;
}

.meta-label {
    width: 80px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.meta-value {
    flex: 1;
    font-size: 0.9375rem;
    color: var(--text-primary);
    word-break: break-all;
}

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

.sender-info .sender-name {
    font-weight: 600;
}

.sender-info .sender-email {
    font-size: 0.8125rem;
    color: var(--primary-light);
}

.meta-value.subject {
    font-weight: 600;
    font-size: 1.0625rem;
}

.spam-row {
    align-items: center;
}

.spam-row .meta-label {
    align-self: center;
}

.view-toggle {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.toggle-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.toggle-btn:hover {
    background: var(--bg-tertiary);
}

.toggle-btn.active {
    background: var(--primary);
    color: var(--text-primary);
    border-color: var(--primary);
}

.toggle-btn svg {
    width: 18px;
    height: 18px;
}

.email-body {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    min-height: 300px;
}

.plain-content {
    padding: 20px;
}

.plain-content pre {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.html-content {
    width: 100%;
    height: 400px;
}

.html-content iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: var(--bg-primary);
}

.no-content {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-tertiary);
}

.attachments-section {
    margin-top: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 20px;
    border: 1px solid var(--border-color);
}

.attachments-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.attachments-title svg {
    width: 20px;
    height: 20px;
    color: var(--primary);
}

.attachments-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.attachment-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.attachment-item:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
}

.attachment-info {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.attachment-icon {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    flex-shrink: 0;
}

.attachment-icon svg {
    width: 20px;
    height: 20px;
}

.attachment-details {
    min-width: 0;
}

.attachment-name {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.attachment-meta {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.download-btn {
    padding: 10px 16px;
    background: var(--primary);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    flex-shrink: 0;
}

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

.download-btn svg {
    width: 16px;
    height: 16px;
}

.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

@media (max-width: 767px) {
    .header {
        padding: 12px 16px;
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .search-bar {
        flex-direction: column;
    }

    .search-input {
        padding: 10px 40px;
    }

    .filter-panel {
        grid-template-columns: 1fr;
    }

    .filter-row {
        grid-column: span 1;
    }

    .filter-actions {
        grid-column: span 1;
    }

    .main-content {
        flex-direction: column;
    }

    .email-list-container {
        max-width: 100%;
        height: 100%;
        border-right: none;
    }

    .email-detail-container {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-primary);
        z-index: 50;
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }

    .email-detail-container.visible {
        transform: translateX(0);
    }

    .detail-header {
        padding: 12px 16px;
    }

    .email-detail {
        padding: 16px;
    }

    .detail-meta {
        padding: 16px;
    }

    .view-toggle {
        flex-wrap: wrap;
    }

    .toggle-btn {
        flex: 1;
        justify-content: center;
    }

    .attachment-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .download-btn {
        width: 100%;
        justify-content: center;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    .email-list-container {
        max-width: 40%;
    }

    .email-detail-container {
        max-width: 60%;
    }

    .filter-panel {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1025px) {
    .email-list-container {
        max-width: 35%;
        min-width: 380px;
    }

    .email-detail-container {
        max-width: 65%;
    }

    .filter-panel {
        grid-template-columns: repeat(4, 1fr);
    }

    .filter-row {
        grid-column: span 1;
    }

    .filter-actions {
        grid-column: span 4;
    }
}

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

.email-item {
    animation: fadeIn 0.3s ease forwards;
}

.email-item:nth-child(1) { animation-delay: 0.05s; }
.email-item:nth-child(2) { animation-delay: 0.1s; }
.email-item:nth-child(3) { animation-delay: 0.15s; }
.email-item:nth-child(4) { animation-delay: 0.2s; }
.email-item:nth-child(5) { animation-delay: 0.25s; }