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

:root {
    --color-bg: #ffffff;
    --color-bg-soft: #f8f9fa;
    --color-bg-muted: #f1f3f5;
    --color-border: #e9ecef;
    --color-border-soft: #f1f3f5;
    --color-text: #1a1a2e;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    --color-primary: #6366f1;
    --color-primary-soft: #eef2ff;
    --color-primary-hover: #4f46e5;
    --color-accent: #ec4899;
    --color-accent-soft: #fdf2f8;
    --color-success: #10b981;
    --color-success-soft: #ecfdf5;
    --color-warning: #f59e0b;
    --color-warning-soft: #fffbeb;
    --color-danger: #ef4444;
    --color-danger-soft: #fef2f2;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.06), 0 2px 4px -2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.06), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.06), 0 8px 10px -6px rgba(0,0,0,0.04);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ─── Typography ─── */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.375rem, 3vw, 1.875rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.375rem); }
h4 { font-size: 1.125rem; }

p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ─── Layout ─── */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
}

@media (min-width: 768px) {
    .container { padding: 0 24px; }
}

@media (min-width: 1024px) {
    .container { padding: 0 32px; }
}

/* ─── Navbar ─── */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 0 16px;
}

.navbar-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

@media (min-width: 768px) {
    .navbar { padding: 0 24px; }
    .navbar-inner { height: 64px; }
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-text);
    letter-spacing: -0.03em;
}

.navbar-brand-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.875rem;
    font-weight: 700;
}

.navbar-nav {
    display: none;
    list-style: none;
    gap: 4px;
}

@media (min-width: 768px) {
    .navbar-nav {
        display: flex;
        align-items: center;
    }
}

.navbar-nav a {
    display: block;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
}

.navbar-nav a:hover {
    color: var(--color-text);
    background: var(--color-bg-muted);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.navbar-mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    background: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text);
    transition: background var(--transition);
}

.navbar-mobile-toggle:hover {
    background: var(--color-bg-muted);
}

@media (min-width: 768px) {
    .navbar-mobile-toggle { display: none; }
}

.mobile-menu {
    display: none;
    position: fixed;
    inset: 60px 0 0 0;
    background: var(--color-bg);
    z-index: 99;
    padding: 16px;
    border-top: 1px solid var(--color-border);
    overflow-y: auto;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu a {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition);
}

.mobile-menu a:hover {
    color: var(--color-text);
    background: var(--color-bg-muted);
}

@media (min-width: 768px) {
    .mobile-menu { display: none !important; }
}

/* ─── Buttons ─── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    user-select: none;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-muted);
    border-color: var(--color-border);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-bg-muted);
    color: var(--color-text);
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
    border-color: #dc2626;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

.btn-full {
    width: 100%;
}

/* ─── Form Elements ─── */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text);
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: all var(--transition);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.form-input-error {
    border-color: var(--color-danger);
}

.form-input-error:focus {
    box-shadow: 0 0 0 3px var(--color-danger-soft);
}

.form-error {
    font-size: 0.75rem;
    color: var(--color-danger);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.form-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.form-stack {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* ─── Card ─── */
.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow var(--transition);
}

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

.card-body {
    padding: 20px;
}

@media (min-width: 768px) {
    .card-body { padding: 24px; }
}

.card-header {
    padding: 20px 20px 0;
}

@media (min-width: 768px) {
    .card-header { padding: 24px 24px 0; }
}

.card-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--color-border-soft);
}

@media (min-width: 768px) {
    .card-footer { padding: 16px 24px; }
}

/* ─── Badge ─── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    line-height: 1;
}

.badge-primary {
    background: var(--color-primary-soft);
    color: var(--color-primary);
}

.badge-accent {
    background: var(--color-accent-soft);
    color: var(--color-accent);
}

.badge-success {
    background: var(--color-success-soft);
    color: var(--color-success);
}

.badge-warning {
    background: var(--color-warning-soft);
    color: var(--color-warning);
}

.badge-danger {
    background: var(--color-danger-soft);
    color: var(--color-danger);
}

/* ─── Separator ─── */
.separator {
    height: 1px;
    background: var(--color-border);
    border: none;
    margin: 24px 0;
}

/* ─── Auth Pages ─── */
.auth-layout {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    background: var(--color-bg-soft);
}

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

.auth-card .card-body {
    padding: 32px 24px;
}

@media (min-width: 768px) {
    .auth-card .card-body { padding: 40px 32px; }
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
}

.auth-header h1 {
    font-size: 1.375rem;
    margin-bottom: 6px;
}

.auth-header p {
    font-size: 0.875rem;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.auth-footer a {
    font-weight: 500;
}

/* ─── Alert ─── */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    line-height: 1.5;
}

.alert-error {
    background: var(--color-danger-soft);
    color: var(--color-danger);
    border: 1px solid #fecaca;
}

.alert-success {
    background: var(--color-success-soft);
    color: var(--color-success);
    border: 1px solid #a7f3d0;
}

.alert-warning {
    background: var(--color-warning-soft);
    color: var(--color-warning);
    border: 1px solid #fde68a;
}

/* ─── Landing Page ─── */
.hero {
    padding: 48px 0 40px;
    text-align: center;
}

@media (min-width: 768px) {
    .hero { padding: 80px 0 64px; }
}

.hero-badge {
    margin-bottom: 20px;
}

.hero h1 {
    margin-bottom: 16px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: clamp(0.9375rem, 2vw, 1.125rem);
    max-width: 560px;
    margin: 0 auto 32px;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

@media (min-width: 480px) {
    .hero-actions {
        flex-direction: row;
        justify-content: center;
    }
}

/* ─── Sections ─── */
.section {
    padding: 48px 0;
}

@media (min-width: 768px) {
    .section { padding: 72px 0; }
}

.section-alt {
    background: var(--color-bg-soft);
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

@media (min-width: 768px) {
    .section-header { margin-bottom: 48px; }
}

.section-header h2 {
    margin-bottom: 10px;
}

.section-header p {
    max-width: 520px;
    margin: 0 auto;
    font-size: 0.9375rem;
}

/* ─── Grid ─── */
.grid {
    display: grid;
    gap: 16px;
}

@media (min-width: 768px) {
    .grid { gap: 20px; }
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

@media (min-width: 640px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ─── Module Card ─── */
.module-card {
    position: relative;
    padding: 24px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

.module-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: transparent;
    transform: translateY(-2px);
}

.module-card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    margin-bottom: 16px;
}

.module-card-icon.primary {
    background: var(--color-primary-soft);
    color: var(--color-primary);
}

.module-card-icon.accent {
    background: var(--color-accent-soft);
    color: var(--color-accent);
}

.module-card-icon.success {
    background: var(--color-success-soft);
    color: var(--color-success);
}

.module-card-icon.warning {
    background: var(--color-warning-soft);
    color: var(--color-warning);
}

.module-card h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.module-card p {
    font-size: 0.8125rem;
    line-height: 1.6;
}

.module-card-arrow {
    position: absolute;
    top: 24px;
    right: 24px;
    color: var(--color-text-muted);
    opacity: 0;
    transform: translateX(-4px);
    transition: all var(--transition);
}

.module-card:hover .module-card-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* ─── Post Card ─── */
.post-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

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

.post-card-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--color-bg-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 2rem;
}

.post-card-body {
    padding: 20px;
}

.post-card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.post-card h3 {
    font-size: 1rem;
    margin-bottom: 8px;
    line-height: 1.4;
}

.post-card p {
    font-size: 0.8125rem;
    line-height: 1.6;
}

/* ─── Footer ─── */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 32px 0;
    text-align: center;
}

.site-footer p {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ─── Admin Layout ─── */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    display: none;
    width: 260px;
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    padding: 20px 12px;
    flex-shrink: 0;
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 101;
    overflow-y: auto;
}

.admin-sidebar.active {
    display: block;
}

@media (min-width: 1024px) {
    .admin-sidebar {
        display: block;
        position: sticky;
        top: 0;
        height: 100vh;
    }
}

.admin-sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    margin-bottom: 24px;
    font-weight: 700;
    font-size: 1rem;
    color: var(--color-text);
}

.admin-sidebar-nav {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.admin-sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
}

.admin-sidebar-nav a:hover,
.admin-sidebar-nav a.active {
    color: var(--color-text);
    background: var(--color-bg-muted);
}

.admin-sidebar-nav a.active {
    background: var(--color-primary-soft);
    color: var(--color-primary);
}

.admin-main {
    flex: 1;
    min-width: 0;
}

.admin-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 50;
}

@media (min-width: 768px) {
    .admin-topbar { padding: 12px 24px; }
}

.admin-topbar-title {
    font-size: 1rem;
    font-weight: 600;
}

.admin-content {
    padding: 24px 16px;
}

@media (min-width: 768px) {
    .admin-content { padding: 32px 24px; }
}

.admin-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.3);
    z-index: 100;
}

.admin-overlay.active {
    display: block;
}

@media (min-width: 1024px) {
    .admin-overlay { display: none !important; }
}

/* ─── Stats Cards ─── */
.stat-card {
    padding: 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.stat-card-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.stat-card-value {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

/* ─── Table ─── */
.table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.table th {
    text-align: left;
    padding: 12px 16px;
    font-weight: 500;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-bg-soft);
    border-bottom: 1px solid var(--color-border);
}

.table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border-soft);
    color: var(--color-text-secondary);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background: var(--color-bg-soft);
}

/* ─── Toast ─── */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease;
    max-width: 360px;
}

.toast-success {
    background: var(--color-success);
    color: white;
}

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

@keyframes toastIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─── Spinner ─── */
.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ─── Empty State ─── */
.empty-state {
    text-align: center;
    padding: 48px 24px;
}

.empty-state-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    background: var(--color-bg-muted);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 1.25rem;
}

.empty-state h3 {
    font-size: 1rem;
    margin-bottom: 6px;
}

.empty-state p {
    font-size: 0.8125rem;
    max-width: 320px;
    margin: 0 auto;
}

/* ─── Utilities ─── */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.hidden { display: none; }