/* Современный дизайн VanillaMail */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --secondary: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    --bg-card: #ffffff;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-light: #ffffff;
    
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --border-dark: #94a3b8;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

/* ===== ФОРМА ВХОДА ===== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-box {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: 3rem;
    width: 100%;
    max-width: 480px;
    text-align: center;
}

.login-header {
    margin-bottom: 2.5rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.logo-icon {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin: 0;
}

.login-form {
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: all 0.2s ease;
    background: var(--bg-secondary);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-card);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.login-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.error-message {
    background: #fef2f2;
    color: var(--danger);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    border: 1px solid #fecaca;
    display: none;
}

.login-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.info-icon {
    font-size: 1.2rem;
}

/* ===== ОСНОВНОЙ ИНТЕРФЕЙС ===== */
.mail-interface {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
}

/* Шапка */
.mail-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 2rem;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 2rem;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-logo .logo-icon {
    font-size: 1.5rem;
}

.header-logo h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 2.5rem;
    height: 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

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

.header-center {
    display: flex;
    justify-content: center;
}

.header-right {
    display: flex;
    gap: 1rem;
}

.header-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.header-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
    transform: translateY(-1px);
}

.header-btn .btn-icon {
    font-size: 1.1rem;
}

/* Основное содержимое */
.mail-main {
    display: grid;
    grid-template-columns: 280px 400px 1fr;
    flex: 1;
    min-height: calc(100vh - 140px);
}

/* Боковые панели */
.sidebar {
    background: var(--bg-card);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.folder-count {
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 600;
}

/* Папки */
.folders-nav {
    flex: 1;
    padding: 1rem 0;
}

.folders-list {
    list-style: none;
}

.folder-item {
    margin-bottom: 0.25rem;
}

.folder-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    position: relative;
}

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

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

.folder-btn.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--secondary);
}

.folder-icon {
    font-size: 1.2rem;
}

.folder-name {
    flex: 1;
}

.folder-badge {
    background: rgba(255, 255, 255, 0.2);
    color: inherit;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 600;
}

/* Элементы управления письмами в хедере */
.mails-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: var(--bg-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.search-container {
    position: relative;
}

.search-input {
    width: 300px;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    background: var(--bg-card);
    transition: all 0.2s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.filter-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.filter-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.filter-checkbox input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-medium);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all 0.2s ease;
}

.filter-checkbox input:checked + .checkmark {
    background: var(--primary);
    border-color: var(--primary);
}

.filter-checkbox input:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
}

.sort-select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 160px;
}

.sort-select:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-card);
}

.mails-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.no-mails {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Элемент письма */
.mail-item {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 1rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.mail-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.mail-item.active {
    border-color: var(--primary);
    background: var(--primary);
    color: white;
}

/* Прочитанные письма - бледные */
.mail-item.read {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
}

.mail-item.read .mail-subject {
    color: var(--text-secondary);
    font-weight: 400;
}

.mail-item.read .mail-sender {
    color: var(--text-muted);
}

.mail-item.read .mail-preview {
    color: var(--text-muted);
}

/* Непрочитанные письма - яркие */
.mail-item.unseen {
    border-left: 4px solid var(--primary);
    background: var(--bg-card);
    border-color: var(--primary);
}

.mail-item.unseen .mail-subject {
    font-weight: 600;
    color: var(--text-primary);
}

.mail-item.unseen .mail-sender {
    color: var(--text-primary);
    font-weight: 500;
}

.mail-item.unseen .mail-preview {
    color: var(--text-secondary);
}

.mail-item.unseen .mail-subject::after {
    content: '●';
    color: var(--primary);
    margin-left: 0.5rem;
    font-size: 0.8rem;
}

.mail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.mail-subject {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    line-height: 1.4;
}

.mail-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.mail-sender {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.mail-preview {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.delete-btn {
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.delete-btn:hover {
    background: #dc2626;
    transform: scale(1.05);
}

/* Просмотр письма */
.mail-content {
    background: var(--bg-card);
    padding: 2rem;
    overflow-y: auto;
}

.mail-content-header {
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
}

.mail-header-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
}

.mail-header-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.mail-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.delete-mail-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.delete-mail-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.delete-mail-btn .btn-icon {
    font-size: 1rem;
}

.no-mail-selected {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.no-mail-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.no-mail-selected h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.no-mail-selected p {
    font-size: 1rem;
    color: var(--text-muted);
}

/* Футер */
.mail-footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-dark);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-left {
    display: flex;
    gap: 2rem;
}

.footer-info {
    display: flex;
    gap: 0.5rem;
}

.footer-label {
    color: var(--text-muted);
}

.footer-value {
    font-weight: 500;
}

.footer-right {
    display: flex;
    gap: 2rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-link {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--primary-light);
}

/* Skeleton */
.skeleton-list {
    padding: 1rem;
}

.skeleton-item {
    height: 120px;
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 37%, var(--bg-tertiary) 63%);
    background-size: 400% 100%;
    animation: shimmer 1.2s infinite;
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
}

@keyframes shimmer {
    0% { background-position: 100% 0; }
    100% { background-position: 0 0; }
}

/* Адаптивность */
@media (max-width: 1200px) {
    .mail-main {
        grid-template-columns: 250px 350px 1fr;
    }
}

@media (max-width: 1024px) {
    .mail-main {
        grid-template-columns: 220px 300px 1fr;
    }
}

@media (max-width: 768px) {
    .mail-main {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto 1fr;
    }
    
    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-light);
    }
    
    .mails-sidebar {
        max-height: 300px;
    }
    
    .mail-content {
        padding: 1rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .login-box {
        padding: 2rem 1.5rem;
        margin: 1rem;
    }
    
    .mail-header {
        padding: 1rem;
        grid-template-columns: 1fr;
        gap: 1rem;
        text-align: center;
    }
    
    .header-left {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .header-center {
        order: 3;
    }
    
    .mails-controls {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .search-input {
        width: 100%;
    }
    
    .filter-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .header-right {
        justify-content: center;
    }
}