@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-main: #f3f4f6;
    --bg-card: #ffffff;
    --border-color: rgba(0, 0, 0, 0.08);
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --accent: #0d9488;
    --accent-hover: #0f766e;
    --success: #10b981;
    --error: #ef4444;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --glass-blur: blur(16px);
}

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

body {
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 0% 0%, rgba(79, 70, 229, 0.04) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(13, 148, 136, 0.04) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    overflow-x: hidden;
}

/* Auth Page */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    width: 100%;
    padding: 20px;
}

.auth-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
    animation: fadeIn 0.6s ease-out;
}

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

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

.brand-logo {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 14px;
    color: #fff;
    font-weight: 700;
    font-size: 20px;
    letter-spacing: 1px;
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
    margin-bottom: 12px;
}

.brand-title {
    font-size: 14px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.form-group {
    margin-bottom: 24px;
}

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

.form-control {
    width: 100%;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border: none;
    border-radius: 12px;
    padding: 14px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.3);
}

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

/* Dashboard Layout */
.dashboard-container {
    width: 100%;
    max-width: 1200px;
    padding: 40px 20px;
    animation: fadeIn 0.5s ease-out;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}

.dashboard-title {
    display: flex;
    align-items: center;
    gap: 15px;
}

.dashboard-title h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.btn-logout {
    background: rgba(239, 68, 68, 0.15);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.3);
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-logout:hover {
    background: var(--error);
    color: #fff;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2);
}

/* Alert Notification */
.alert {
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 24px;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideDown 0.3s ease-out;
}

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

.alert-success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--success);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--error);
}

/* Tabs */
.tabs-navigation {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.tab-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 12px 24px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background: rgba(0, 0, 0, 0.02);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

/* Editor Panel */
.main-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 992px) {
    .main-grid {
        grid-template-columns: 1.2fr 0.8fr;
    }
}

.editor-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Textarea styling */
textarea.form-control {
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
    min-height: 350px;
}

/* Help text */
.help-box {
    background: rgba(13, 148, 136, 0.05);
    border: 1px dashed rgba(13, 148, 136, 0.2);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
}

.help-box h4 {
    color: var(--accent);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
}

.help-box p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.help-box code {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 12px;
}

/* Preview Box */
.preview-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
}

.preview-container {
    background: #f9fafb;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px;
    flex-grow: 1;
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

.preview-header-meta {
    padding: 8px 12px 12px 12px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.preview-subject {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preview-subject span {
    color: var(--text-secondary);
    margin-right: 6px;
}

.preview-iframe {
    width: 100%;
    height: 100%;
    min-height: 380px;
    border: none;
    border-radius: 8px;
    background: transparent;
}

/* Sidebar Layout styles */
.admin-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-top: 20px;
    width: 100%;
}

@media (min-width: 768px) {
    .admin-layout {
        grid-template-columns: 260px 1fr;
    }
}

.admin-sidebar {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    height: fit-content;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
}

.sidebar-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: 10px;
    margin-bottom: 8px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.sidebar-item:hover {
    background: rgba(0, 0, 0, 0.03);
    color: var(--text-primary);
    transform: translateX(4px);
}

.sidebar-item.active {
    background: rgba(79, 70, 229, 0.08);
    border: 1px solid rgba(79, 70, 229, 0.15);
    color: var(--primary);
}

.admin-main-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.welcome-card {
    text-align: left;
    padding: 40px;
}

/* --- THEME TOGGLE BUTTON & NAVIGATION ACTIONS --- */
.theme-toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 22px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.theme-toggle-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.dark .theme-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

/* --- DARK MODE VARIABLES & ADJUSTMENTS --- */
.dark {
    --bg-main: #0b0f19;
    --bg-card: rgba(17, 24, 39, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --accent: #06b6d4;
    --accent-hover: #0891b2;
}

.dark body {
    background-color: var(--bg-main);
    color: var(--text-primary);
}

.dark .preview-container {
    background: #090d16;
}

.dark .form-control {
    background: rgba(255, 255, 255, 0.03);
}

.dark .form-control:focus {
    background: rgba(17, 24, 39, 0.8);
}

.dark .sidebar-item:hover {
    background: rgba(255, 255, 255, 0.04);
}

.dark .sidebar-item.active {
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
    color: #ffffff;
}

/* Smooth transition for theme switching */
body, .auth-card, .dashboard-header, .admin-sidebar, .editor-card, .preview-card, .preview-container, .form-control, .btn, .tab-btn, .sidebar-item {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}