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

/* ==================== CSS Variables & Design Tokens ==================== */
:root {
    /* Brand */
    --color-primary: #ef4444;
    --color-primary-600: #dc2626;
    --color-primary-50: #fff1f2;

    /* Surfaces */
    --color-bg: #f6f7fb;
    --color-surface: #ffffff;
    --color-surface-2: #f3f4f6;
    --color-surface-3: #eef2ff;

    /* Text */
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-text-subtle: #94a3b8;

    /* Borders & Shadows */
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.10);

    /* Layout */
    --sidebar-width: 288px;
    --topbar-height: 72px;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;

    /* Legacy spacing aliases (used in existing markup) */
    --spacing-xs: var(--spacing-2);
    --spacing-sm: var(--spacing-4);
    --spacing-md: var(--spacing-6);
    --spacing-lg: var(--spacing-8);
    --spacing-xl: var(--spacing-12);

    /* Radius */
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;

    /* Typography */
    --font-family-base: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 0.95rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 1.875rem;
    --line-height-base: 1.55;
}

/* ==================== Global Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    text-rendering: optimizeLegibility;
}

/* ==================== Login Page ==================== */
.auth-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(420px, 520px) 1fr;
    background: var(--color-surface);
}

.auth-left {
    padding: clamp(28px, 4vw, 44px);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
}

.auth-card {
    width: 100%;
    max-width: 420px;
}

.auth-right {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(1000px 500px at 20% 20%, rgba(255,255,255,0.18) 0%, rgba(255,255,255,0) 55%),
        radial-gradient(900px 500px at 70% 60%, rgba(255,255,255,0.10) 0%, rgba(255,255,255,0) 55%),
        linear-gradient(135deg, #2b3bff 0%, #5b2fff 55%, #8b2dff 100%);
    display: flex;
    align-items: flex-end;
    padding: clamp(28px, 4vw, 60px);
}

.auth-right-inner {
    max-width: 520px;
    color: rgba(255, 255, 255, 0.95);
}

.auth-right-inner h2 {
    font-size: clamp(1.5rem, 2.6vw, 2.4rem);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-4);
}

.auth-right-inner p {
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.98rem;
    max-width: 44ch;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: var(--spacing-6);
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.login-header h1 {
    font-size: 1.55rem;
    margin-bottom: var(--spacing-2);
    color: var(--color-text);
    font-weight: 700;
    letter-spacing: -0.03em;
}

.login-header p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 400;
}

.login-form {
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-5);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--color-text);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.9rem 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--color-surface);
    color: var(--color-text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="password"]:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.12);
}

.form-group small {
    display: block;
    margin-top: var(--spacing-2);
    color: var(--color-text-subtle);
    font-size: var(--font-size-sm);
}

.form-remember {
    display: flex;
    align-items: center;
    margin: var(--spacing-4) 0 var(--spacing-6);
    gap: var(--spacing-2);
}

.form-remember input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-remember label {
    margin: 0;
    cursor: pointer;
    font-size: var(--font-size-sm);
}

.login-footer {
    text-align: center;
    border-top: none;
    padding-top: var(--spacing-6);
}

.login-footer p {
    margin-bottom: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.link {
    color: var(--color-primary);
    text-decoration: none;
    transition: opacity 0.2s;
}

.link:hover {
    opacity: 0.7;
    text-decoration: none;
}

.oauth-divider {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    margin: var(--spacing-6) 0;
    color: var(--color-text-subtle);
    font-size: var(--font-size-xs);
}

.oauth-divider::before,
.oauth-divider::after {
    content: "";
    height: 1px;
    background: var(--border-color);
    flex: 1;
}

.btn-google {
    background: var(--color-surface);
    border: 1px solid var(--border-color);
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

.btn-google:hover {
    border-color: rgba(15, 23, 42, 0.18);
}

/* ==================== App Layout ==================== */
.app-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
    gap: 0;
    background-color: var(--color-bg);
}

.sidebar {
    background-color: var(--color-surface);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-8) var(--spacing-6);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: var(--sidebar-width);
    overflow-y: auto;
    z-index: 100;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-8);
}

.toggle-sidebar {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    font-size: var(--font-size-lg);
    cursor: pointer;
}

.nav-section-title {
    color: var(--color-text-subtle);
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin: var(--spacing-6) 0 var(--spacing-3);
}

.nav-menu {
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: 0.75rem 0.9rem;
    margin-bottom: var(--spacing-2);
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: 12px;
    transition: color 0.15s, background-color 0.15s, box-shadow 0.15s;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.nav-link:hover {
    background-color: rgba(15, 23, 42, 0.03);
    color: var(--color-text);
}

.nav-link.active {
    background-color: var(--color-primary-50);
    color: var(--color-primary-600);
    box-shadow: inset 0 0 0 1px rgba(239, 68, 68, 0.15);
}

.nav-link .icon {
    width: 34px;
    height: 34px;
    border-radius: 11px;
    display: grid;
    place-items: center;
    background: rgba(15, 23, 42, 0.04);
    font-size: 1.05rem;
}

.sidebar-footer {
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--border-color);
}

.main-content {
    grid-column: 2;
    padding: var(--spacing-8) var(--spacing-8) var(--spacing-12);
    overflow-y: auto;
    background-color: var(--color-bg);
}

/* ==================== Header ==================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-8);
    gap: var(--spacing-8);
}

.header-left h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-1);
    letter-spacing: -0.03em;
}

.subtitle {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
}

.search-bar input {
    padding: 0.85rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    background-color: var(--color-surface);
    color: var(--color-text);
    width: min(340px, 42vw);
    box-shadow: var(--shadow-sm);
}

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

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.user-name {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.05rem;
    border: 1px solid transparent;
    border-radius: 14px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    text-decoration: none;
    white-space: nowrap;
    gap: var(--spacing-xs);
    font-family: inherit;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 12px 30px rgba(239, 68, 68, 0.20);
}

.btn-primary:hover {
    background-color: var(--color-primary-600);
}

.btn-secondary {
    background-color: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    border-color: rgba(15, 23, 42, 0.18);
}

.btn-danger {
    background-color: transparent;
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.45);
}

.btn-danger:hover {
    background-color: rgba(239, 68, 68, 0.08);
}

.btn-small {
    padding: 0.5rem 0.875rem;
    font-size: var(--font-size-sm);
}

/* ==================== Dashboard Content ==================== */
.dashboard-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-10);
}

.stats-section h2,
.recent-section h2,
.quick-actions-section h2 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-5);
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-5);
}

@media (min-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

.stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-5);
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    transition: all 0.15s;
    box-shadow: var(--shadow-sm);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: rgba(99, 102, 241, 0.10);
    color: #4f46e5;
    font-size: 1.5rem;
}

.stat-info h3 {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-2);
}

.stat-value {
    font-size: var(--font-size-xl);
    font-weight: bold;
    color: var(--color-text);
}

.table-responsive {
    overflow-x: auto;
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background-color: var(--color-surface-2);
    border-bottom: 1px solid var(--border-color);
}

.table th {
    padding: var(--spacing-5);
    text-align: left;
    font-weight: 500;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.table td {
    padding: var(--spacing-5);
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-size-sm);
    color: var(--color-text);
}

.table tbody tr:hover {
    background-color: rgba(15, 23, 42, 0.02);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.55rem;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.badge-success {
    background-color: rgba(16, 185, 129, 0.2);
    color: #059669;
}

.badge-warning {
    background-color: rgba(245, 158, 11, 0.2);
    color: #b45309;
}

.badge-secondary {
    background-color: rgba(148, 163, 184, 0.2);
    color: var(--color-text-muted);
}

.action-link {
    color: #4f46e5;
    text-decoration: none;
    transition: color 0.2s;
}

.action-link:hover {
    color: #4338ca;
    text-decoration: underline;
}

.section-footer {
    margin-top: var(--spacing-5);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

/* ==================== Form Styles ==================== */
.form-container {
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-10);
    max-width: 900px;
    box-shadow: var(--shadow-sm);
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-10);
}

.form-section {
    border-bottom: 1px solid var(--border-color);
    /* padding-bottom: var(--spacing-10); */
}

.form-section:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.form-section h2 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-5);
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-6);
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group textarea {
    resize: vertical;
    font-family: monospace;
}

.editor-toolbar {
    display: flex;
    gap: var(--spacing-3);
    margin-top: var(--spacing-5);
    padding: var(--spacing-5);
    background-color: var(--color-surface-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.toolbar-btn {
    padding: 0.5rem 0.875rem;
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.15s;
    font-weight: 400;
}

.toolbar-btn:hover {
    border-color: rgba(15, 23, 42, 0.18);
}

.recipient-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.checkbox-option {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
    padding: var(--spacing-5);
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s;
    box-shadow: var(--shadow-sm);
}

.checkbox-option:hover {
    box-shadow: var(--shadow-md);
}

.checkbox-option input[type="radio"],
.checkbox-option input[type="checkbox"] {
    margin-top: 2px;
    cursor: pointer;
}

.checkbox-option span {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.checkbox-option strong {
    color: var(--color-text);
}

.checkbox-option small {
    color: var(--color-text-subtle);
}

.form-actions {
    display: flex;
    gap: var(--spacing-4);
    justify-content: flex-end;
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--border-color);
}

/* ==================== Modal ==================== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-md);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-6);
    border-bottom: 1px solid var(--border-color);
}

.modal-close {
    background: none;
    border: none;
    color: var(--color-text);
    font-size: var(--font-size-2xl);
    cursor: pointer;
    line-height: 1;
}

.modal-body {
    padding: var(--spacing-6);
}

.modal-footer {
    padding: var(--spacing-6);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-4);
}

/* ==================== Newsletter View ==================== */
.newsletters-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.newsletter-item {
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-8);
    transition: all 0.15s;
    box-shadow: var(--shadow-sm);
}

.newsletter-item:hover {
    box-shadow: var(--shadow-md);
}

.newsletter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-5);
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.newsletter-header h3 {
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

.newsletter-preview {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-5);
    line-height: 1.6;
}

.newsletter-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-4);
    padding: var(--spacing-5) 0;
    border: 1px solid var(--border-color);
    border-left: none;
    border-right: none;
    margin: var(--spacing-5) 0;
    padding: var(--spacing-5) 0;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.meta-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-subtle);
}

.meta-value {
    color: var(--color-text);
    font-weight: 500;
}

.newsletter-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-4);
    margin: var(--spacing-6) 0;
    padding: var(--spacing-6);
    background-color: var(--color-surface-2);
    border-radius: var(--radius-md);
}

.stat {
    text-align: center;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-subtle);
    display: block;
    margin-bottom: var(--spacing-1);
}

.stat-data {
    font-size: var(--font-size-lg);
    font-weight: bold;
    color: var(--color-text);
}

.stat-percent {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    display: block;
}

.newsletter-actions {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.filter-bar {
    display: flex;
    gap: var(--spacing-4);
}

.filter-bar select {
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    background-color: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-sm);
}

/* Password toggle */
.password-field {
    position: relative;
    display: flex;
    align-items: center;
}

.password-field input[type="password"],
.password-field input[type="text"] {
    padding-right: 3rem;
}

.password-toggle {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    display: grid;
    place-items: center;
    z-index: 5;
}

.password-toggle:hover {
    border-color: rgba(15, 23, 42, 0.18);
}

.password-toggle-icon {
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1;
}

/* Quill editor content */
.ql-editor img,
#editorBody img {
    max-width: 700px;
    width: 100%;
    height: auto;
    display: block;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-6);
    margin-top: var(--spacing-10);
}

.page-info {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ==================== Settings Page ==================== */
.settings-container {
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.settings-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--border-color);
    padding: 0 var(--spacing-6);
    overflow-x: auto;
    background-color: var(--color-surface-2);
}

.tab-btn {
    padding: var(--spacing-5) var(--spacing-6);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.15s;
    font-size: var(--font-size-sm);
    white-space: nowrap;
    font-weight: 400;
}

.tab-btn:hover {
    color: var(--color-text);
}

.tab-btn.active {
    color: var(--color-primary-600);
    border-bottom-color: var(--color-primary);
    font-weight: 500;
}

.tab-content {
    display: none;
    padding: var(--spacing-10);
}

.tab-content.active {
    display: block;
}

.settings-section {
    margin-bottom: var(--spacing-10);
    padding-bottom: var(--spacing-10);
    border-bottom: 1px solid var(--border-color);
}

.settings-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.settings-section h2 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-5);
    color: var(--color-text);
}

.settings-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.profile-upload {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
}

.profile-image {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    object-fit: cover;
}

.upload-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.notification-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.notification-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
    padding: var(--spacing-5);
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s;
    box-shadow: var(--shadow-sm);
}

.notification-item:hover {
    box-shadow: var(--shadow-md);
}

.notification-item input {
    margin-top: 2px;
    cursor: pointer;
}

.notification-item div {
    flex: 1;
}

.notification-item strong {
    color: var(--color-text);
    display: block;
    margin-bottom: var(--spacing-1);
}

.notification-item small {
    color: var(--color-text-subtle);
}

.danger-zone {
    background-color: rgba(239, 68, 68, 0.04);
    border: 1px solid rgba(239, 68, 68, 0.18);
    padding: var(--spacing-6);
    border-radius: var(--radius-md);
}

.plan-info {
    background-color: var(--color-surface-2);
    padding: var(--spacing-6);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-6);
    border: 1px solid var(--border-color);
}

.plan-info h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-3);
}

.plan-info p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-4);
}

.plan-features {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg) !important;
}

.billing-details {
    background-color: var(--color-surface-2);
    padding: var(--spacing-6);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-6);
    border: 1px solid var(--border-color);
}

.billing-details p {
    margin-bottom: var(--spacing-3);
    color: var(--color-text-muted);
}

.invoice-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-6);
}

.invoice-table th {
    background-color: var(--color-surface-2);
    padding: var(--spacing-5);
    text-align: left;
    font-weight: 500;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--border-color);
}

.invoice-table td {
    padding: var(--spacing-5);
    border-bottom: 1px solid var(--border-color);
    color: var(--color-text);
}

.subscriber-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-10);
}

.file-upload {
    padding: var(--spacing-6);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: all 0.15s;
    background-color: var(--color-surface-2);
}

.file-upload:hover {
    border-color: var(--color-primary);
    background-color: var(--color-surface);
}

.file-upload input {
    display: none;
}

.file-upload p {
    color: var(--color-text-muted);
    margin: var(--spacing-3) 0 0 0;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: fixed;
        left: calc(-1 * var(--sidebar-width));
        transition: left 0.3s;
        z-index: 200;
        height: 100vh;
        width: var(--sidebar-width);
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .toggle-sidebar {
        display: block;
    }
    
    .main-content {
        grid-column: 1;
    }
}

@media (max-width: 768px) {
    .auth-shell {
        grid-template-columns: 1fr;
    }

    .auth-right {
        min-height: 240px;
        align-items: center;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-4);
    }
    
    .header-right {
        width: 100%;
        flex-direction: column;
    }
    
    .search-bar input {
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .newsletter-meta {
        grid-template-columns: 1fr;
    }
    
    .settings-tabs {
        flex-wrap: wrap;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .btn {
        width: 100%;
    }
    
    .newsletter-actions {
        flex-direction: column;
    }
    
    .newsletter-actions .btn {
        width: 100%;
    }
}

@media (max-width: 640px) {
    .main-content {
        padding: var(--spacing-6);
    }
    
    .form-container {
        padding: var(--spacing-6);
    }
    
    .header h1 {
        font-size: var(--font-size-xl);
    }
    
    .table {
        font-size: var(--font-size-sm);
    }
    
    .table th,
    .table td {
        padding: var(--spacing-3);
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
    }
}