:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent-primary: #FF6B35;
    --accent-secondary: #FF8C42;
    --border-color: #333;
    --success: #00ff88;
    --error: #ff3860;
    --sidebar-width: 250px;
    --sidebar-collapsed: 60px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #1a0f0f 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.page-container {
    min-height: 100vh;
}

.login-container {
    max-width: 400px;
    margin: 10vh auto;
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 8px 32px rgba(255, 107, 53, 0.1);
    border: 1px solid var(--border-color);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.logo-icon {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.login-header h1 {
    font-size: 28px;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group textarea,
.form-group select,
.config-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus,
.config-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.checkbox-group {
    display: flex;
    gap: 20px;
}

.checkbox-group label,
.form-group label input[type="checkbox"] {
    cursor: pointer;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.4);
}

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

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

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

.error-message {
    color: var(--error);
    font-size: 13px;
    margin-top: 10px;
    text-align: center;
    display: none;
}

.error-message.show {
    display: block;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.navbar {
    background: var(--bg-secondary);
    padding: 16px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
}

.layout {
    display: flex;
    height: calc(100vh - 73px);
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar.collapsed .menu-item span {
    opacity: 0;
    width: 0;
}

.sidebar-menu {
    padding: 20px 0;
}

.menu-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
    text-align: left;
}

.menu-item:hover {
    background: rgba(255, 107, 53, 0.05);
    color: var(--text-primary);
}

.menu-item.active {
    background: rgba(255, 107, 53, 0.1);
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
}

.menu-item svg {
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.menu-item:hover svg {
    transform: scale(1.1);
}

.menu-item span {
    white-space: nowrap;
    transition: all 0.3s ease;
}

.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
}

.page {
    display: none;
    animation: slideIn 0.4s ease-out;
}

.page.active {
    display: block;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.content-header h2 {
    font-size: 28px;
}

.mailbox-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.mailbox-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
}

.mailbox-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(255, 107, 53, 0.2);
    border-color: var(--accent-primary);
}

.mailbox-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--accent-primary);
}

.mailbox-card .mailbox-email {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

.mailbox-card .mailbox-stats {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

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

.mailbox-card .btn {
    flex: 1;
    font-size: 12px;
    padding: 8px 12px;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 16px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow: auto;
    border: 1px solid var(--border-color);
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 22px;
    color: var(--accent-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 32px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s ease;
}

.modal-close:hover {
    color: var(--accent-primary);
}

.modal-body {
    padding: 24px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.email-login {
    max-width: 400px;
    margin: 0 auto;
    background: var(--bg-secondary);
    padding: 32px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.email-login h3 {
    margin-bottom: 24px;
    color: var(--accent-primary);
}

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

.email-item {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

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

.email-item .email-from {
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 4px;
}

.email-item .email-subject {
    font-size: 14px;
    margin-bottom: 4px;
}

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

.settings-container,
.admin-container {
    max-width: 800px;
}

.settings-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

.settings-section h3 {
    color: var(--accent-primary);
    margin-bottom: 24px;
    font-size: 20px;
}

.success-message {
    color: var(--success);
    background: rgba(0, 255, 136, 0.1);
    padding: 12px 16px;
    border-radius: 8px;
    margin-top: 16px;
    border: 1px solid var(--success);
    animation: fadeIn 0.3s ease;
}

@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        left: 0;
        top: 73px;
        height: calc(100vh - 73px);
        z-index: 100;
        transform: translateX(-100%);
    }
    
    .sidebar:not(.collapsed) {
        transform: translateX(0);
    }
    
    .main-content {
        width: 100%;
    }
    
    .mailbox-list {
        grid-template-columns: 1fr;
    }
}