/* ============================================================
   MevzuForum - Modern CSS Design System
   Version: 2.0.0
   ============================================================ */

/* ============================================================
   CSS CUSTOM PROPERTIES (Variables)
   ============================================================ */
:root {
    /* Primary Colors */
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.1);
    
    /* Secondary Colors */
    --secondary: #8b5cf6;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    
    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Light Theme (default for data-theme="light") */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --surface: #ffffff;
    --surface-hover: #f8fafc;
    --border: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Layout */
    --container-max: 1280px;
    --navbar-height: 64px;
    --sidebar-width: 320px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --surface: #1e293b;
    --surface-hover: #334155;
    --border: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

/* ============================================================
   RESET & BASE STYLES
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

button {
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ============================================================
   LAYOUT & CONTAINER
   ============================================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.layout {
    flex: 1;
    padding: var(--space-6) 0;
}

.layout-container {
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--space-6);
}

.main-content {
    min-width: 0;
}

@media (max-width: 1024px) {
    .layout-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: none;
    }
}

/* ============================================================
   AD SLOTS
   ============================================================ */
.ad-slot {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px dashed var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.ad-header {
    min-height: 90px;
    max-height: 90px;
    margin-bottom: var(--space-2);
}

.ad-sidebar {
    min-height: 600px;
    position: sticky;
    top: calc(var(--navbar-height) + var(--space-4));
}

.ad-placeholder {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    text-align: center;
    padding: var(--space-4);
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--navbar-height);
    backdrop-filter: blur(10px);
    background: rgba(var(--surface), 0.9);
}

[data-theme="dark"] .navbar {
    background: rgba(30, 41, 59, 0.9);
}

.navbar-container {
    display: flex;
    align-items: center;
    height: 100%;
    gap: var(--space-6);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.brand-icon {
    font-size: 1.5rem;
}

.navbar-menu {
    display: flex;
    align-items: center;
    flex: 1;
    gap: var(--space-4);
}

.navbar-nav {
    display: flex;
    align-items: center;
    list-style: none;
    gap: var(--space-1);
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-3);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: var(--primary-light);
}

.nav-admin {
    color: var(--accent) !important;
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-toggle::after {
    content: '▾';
    margin-left: var(--space-1);
    font-size: 0.7em;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    list-style: none;
    z-index: 1000;
}

.dropdown:hover .dropdown-menu,
.dropdown-menu:hover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu-end {
    left: auto;
    right: 0;
}

.dropdown-item {
    display: block;
    padding: var(--space-2) var(--space-3);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--primary-light);
    color: var(--text-primary);
}

.dropdown-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: var(--space-2) 0;
}

/* Navbar Search */
.navbar-search {
    display: flex;
    flex: 1;
    max-width: 400px;
}

.search-input {
    flex: 1;
    padding: var(--space-2) var(--space-3);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-right: none;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast);
}

.search-input:focus {
    border-color: var(--primary);
}

.search-btn {
    padding: var(--space-2) var(--space-3);
    background: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: white;
    transition: background var(--transition-fast);
}

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

/* User Avatar */
.user-dropdown {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

/* Theme Toggle */
.theme-toggle {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--primary-light);
    color: var(--text-primary);
}

.theme-icon {
    font-size: 1.25rem;
}

/* Mobile Navigation */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    background: transparent;
    border: none;
}

.navbar-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .navbar-toggle {
        display: flex;
    }
    
    .navbar-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        background: var(--surface);
        padding: var(--space-4);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        overflow-y: auto;
    }
    
    .navbar-menu.active {
        transform: translateX(0);
    }
    
    .navbar-nav {
        flex-direction: column;
        width: 100%;
    }
    
    .navbar-search {
        max-width: 100%;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        padding-left: var(--space-4);
        display: none;
    }
    
    .dropdown.active .dropdown-menu {
        display: block;
    }
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.card-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.card-body {
    padding: var(--space-4);
}

.card-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

/* ============================================================
   TOPIC CARDS
   ============================================================ */
.topic-card {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

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

.topic-card.sticky {
    border-left: 4px solid var(--accent);
    background: linear-gradient(90deg, rgba(245, 158, 11, 0.05), transparent);
}

.topic-card.locked {
    opacity: 0.7;
}

.topic-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.topic-content {
    flex: 1;
    min-width: 0;
}

.topic-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.topic-title a {
    color: inherit;
}

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

.topic-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.topic-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.topic-stats {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-3);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    min-width: 70px;
}

.topic-stats-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.topic-stats-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.badge-category {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.badge-sticky {
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent);
}

.badge-locked {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

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

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-lg);
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

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

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

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

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

/* ============================================================
   FORMS
   ============================================================ */
.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: var(--space-3);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

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

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* ============================================================
   ALERTS
   ============================================================ */
.alert {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    border-left: 4px solid;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success);
    color: var(--success);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger);
    color: var(--danger);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--warning);
    color: var(--warning);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--info);
    color: var(--info);
}

/* ============================================================
   WIDGETS (Sidebar)
   ============================================================ */
.widget {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
}

.widget-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

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

.widget-list li {
    margin-bottom: var(--space-2);
}

.widget-list a {
    display: block;
    padding: var(--space-2);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.widget-list a:hover {
    background: var(--primary-light);
    color: var(--text-primary);
}

/* ============================================================
   PAGE HEADER
   ============================================================ */
.page-header {
    margin-bottom: var(--space-6);
}

.page-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.page-subtitle {
    color: var(--text-secondary);
}

/* ============================================================
   COMMENTS
   ============================================================ */
.comment-card {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-4);
    border-bottom: 1px solid var(--border);
}

.comment-card:last-child {
    border-bottom: none;
}

.comment-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.comment-content {
    flex: 1;
}

.comment-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.comment-author {
    font-weight: 600;
    color: var(--text-primary);
}

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

.comment-text {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================================
   USER RANKS
   ============================================================ */
.rank-newbie { color: #94a3b8; }
.rank-member { color: #10b981; }
.rank-active { color: #3b82f6; }
.rank-senior { color: #8b5cf6; }
.rank-expert { color: #f59e0b; }
.rank-guru { color: #ef4444; }
.rank-legend { 
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: var(--space-8) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

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

.footer-links {
    display: flex;
    gap: var(--space-4);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

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

/* ============================================================
   UTILITIES
   ============================================================ */
.text-primary { color: var(--text-primary) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }

.text-center { text-align: center !important; }
.text-right { text-align: right !important; }

.mt-1 { margin-top: var(--space-1) !important; }
.mt-2 { margin-top: var(--space-2) !important; }
.mt-3 { margin-top: var(--space-3) !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-6 { margin-top: var(--space-6) !important; }

.mb-1 { margin-bottom: var(--space-1) !important; }
.mb-2 { margin-bottom: var(--space-2) !important; }
.mb-3 { margin-bottom: var(--space-3) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-6 { margin-bottom: var(--space-6) !important; }

.d-flex { display: flex !important; }
.align-center { align-items: center !important; }
.justify-between { justify-content: space-between !important; }
.gap-2 { gap: var(--space-2) !important; }
.gap-4 { gap: var(--space-4) !important; }

.w-full { width: 100% !important; }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn var(--transition-base);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.pulse {
    animation: pulse 2s infinite;
}

/* ============================================================
   ANIMATIONS & MICRO-INTERACTIONS
   ============================================================ */
.topic-card,
.card,
.btn,
.nav-link {
    transition: all var(--transition-fast);
}

/* Smooth hover lift effect */
.topic-card:hover,
.card:hover {
    transform: translateY(-2px);
}

/* Button press effect */
.btn:active {
    transform: scale(0.98);
}

/* Link underline animation */
.animated-link {
    position: relative;
}

.animated-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-fast);
}

.animated-link:hover::after {
    width: 100%;
}