/* ==========================================================================
   CSS Variables & Base Configuration
   ========================================================================== */
:root {
    /* Color Palette */
    --primary-color: #1a5f7a;
    --secondary-color: #2c8a9e;
    --accent-color: #f4b942;
    --text-color: #222;
    --text-muted: #666;
    --light-bg: #f8fafc;
    --white: #fff;
    --border-color: #e0e0e0;
    --error-color: #dc3545;
    --success-color: #28a745;
    --warning-color: #ffc107;
    
    /* Spacing System */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, 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: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Effects */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 24px rgba(26, 95, 122, 0.08);
    --shadow-lg: 0 8px 32px rgba(26, 95, 122, 0.15);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s ease-out;
    
    /* Breakpoints */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
}

/* ==========================================================================
   CSS Reset & Base Styles
   ========================================================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    line-height: 1.7;
    color: var(--text-color);
    background: var(--light-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

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

a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ==========================================================================
   Layout Components
   ========================================================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

.site-grid {
    display: grid;
    grid-template-columns: 220px 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas: "header header" "sidebar main";
    min-height: 100vh;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.main-header {
    grid-area: header;
    background: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition-base);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nav-menu {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    gap: var(--spacing-lg);
}

.logo a {
    color: var(--primary-color);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    position: relative;
}

.nav-links a:hover,
.nav-links a:focus {
    background: var(--primary-color);
    color: var(--white);
    outline: none;
    transform: translateY(-2px);
}

/* ==========================================================================
   Buttons & Interactive Elements
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    min-height: 44px;
    min-width: 44px;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--accent-color);
    color: var(--white);
}

.btn-secondary:hover {
    background: #e6a800;
    transform: translateY(-2px);
}

/* ==========================================================================
   Cards & Content
   ========================================================================== */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: none;
    overflow: hidden;
    transition: var(--transition-base);
    position: relative;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-img-top {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-body {
    padding: var(--spacing-lg);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.card-text {
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-sm);
    background: var(--accent-color);
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

/* ==========================================================================
   Forms & Inputs
   ========================================================================== */
.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    min-height: 44px;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 95, 122, 0.1);
}

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

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

/* ==========================================================================
   Sidebar
   ========================================================================== */
.sidebar {
    grid-area: sidebar;
    background: var(--white);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    min-height: 0;
    overflow-y: auto;
}

.sidebar h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    font-weight: 700;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar li {
    margin-bottom: var(--spacing-sm);
}

.sidebar button,
.sidebar a {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: var(--font-size-base);
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    width: 100%;
    text-align: left;
    display: block;
    text-decoration: none;
    font-weight: 500;
}

.sidebar button.active,
.sidebar button:hover,
.sidebar a:hover {
    background: rgba(244, 185, 66, 0.15);
    color: var(--accent-color);
    transform: translateX(8px);
}

/* ==========================================================================
   Main Content
   ========================================================================== */
.site-main {
    grid-area: main;
    background: var(--light-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    min-width: 0;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    padding: var(--spacing-md) 0;
}

/* ==========================================================================
   Search & Suggestions
   ========================================================================== */
.header-search-form {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0;
}

.header-search-form input[type="text"] {
    border-radius: 20px 0 0 20px;
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    height: 36px;
    width: 240px;
}

.header-search-form button {
    border-radius: 0 20px 20px 0;
    font-size: var(--font-size-sm);
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-md);
}

#search-suggestions {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    box-shadow: var(--shadow-lg);
    max-height: 320px;
    overflow-y: auto;
    display: none;
    position: absolute;
    top: 36px;
    left: 0;
    right: 0;
    z-index: 1500;
}

#search-suggestions.active {
    display: block;
}

.suggestion-item {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    color: var(--primary-color);
    font-size: var(--font-size-base);
    transition: var(--transition-base);
}

.suggestion-item:last-child {
    border-bottom: none;
}

.suggestion-item:hover,
.suggestion-item.active {
    background: rgba(244, 185, 66, 0.15);
    color: var(--accent-color);
}

/* ==========================================================================
   Mobile Menu
   ========================================================================== */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: var(--transition-base);
    background: transparent;
    border: none;
    min-width: 48px;
    min-height: 48px;
    justify-content: center;
    align-items: center;
}

.mobile-menu-btn:hover {
    background: rgba(26, 95, 122, 0.1);
}

.mobile-menu-btn span {
    width: 24px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition-base);
    transform-origin: center;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

/* ==========================================================================
   Loading & Error States
   ========================================================================== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.loading::after {
    content: '';
    width: 32px;
    height: 32px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    background: #fee;
    color: var(--error-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    border-left: 4px solid var(--error-color);
}

.success-message {
    background: #efe;
    color: var(--success-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    border-left: 4px solid var(--success-color);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 900px) {
    /* Mobile Layout */
    .site-grid {
        display: block;
    }
    
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        height: 100vh;
        width: 280px;
        z-index: 3200;
        background: var(--white);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-base);
        overflow-y: auto;
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .site-main {
        background: var(--light-bg);
        border-radius: 0;
        box-shadow: none;
        padding: var(--spacing-md);
        margin-top: 0;
    }
    
    .container {
        padding: var(--spacing-md);
        max-width: 100%;
    }
    
    /* Mobile Navigation */
    .nav-menu {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        position: relative;
        min-height: 64px;
        padding: var(--spacing-sm) 0;
    }
    
    .mobile-menu-btn {
        display: flex;
        order: 1;
        z-index: 2002;
    }
    
    .logo {
        order: 2;
        flex: 1;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    
    .logo a {
        font-size: var(--font-size-xl);
    }
    
    .nav-main-group {
        order: 3;
        width: 100%;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        display: none;
        z-index: 2001;
        padding-top: 3.5rem;
        box-shadow: var(--shadow-lg);
        transition: var(--transition-base);
    }
    
    .nav-links.open {
        display: flex;
    }
    
    .nav-links li {
        width: 100%;
        text-align: left;
        padding: var(--spacing-sm) var(--spacing-lg);
    }
    
    .nav-links a {
        width: 100%;
        display: block;
        font-size: var(--font-size-lg);
        padding: var(--spacing-md) 0;
        border-radius: 0;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-links a:hover {
        background: var(--primary-color);
        color: var(--white);
        transform: none;
        padding-left: var(--spacing-xl);
    }
    
    /* Mobile Search */
    .header-search-form {
        width: 100%;
        max-width: none;
        margin: var(--spacing-lg) 0 var(--spacing-sm) 0;
        justify-content: center;
        display: flex;
        padding: 0 var(--spacing-md);
    }
    
    .header-search-form input[type="text"] {
        width: 100%;
        height: 40px;
        font-size: var(--font-size-base);
    }
    
    .header-search-form button {
        height: 40px;
    }
    
    #search-suggestions {
        top: 40px;
        left: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    /* Mobile Cards */
    .posts-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        margin: 0;
    }
    
    .card {
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-sm);
    }
    
    .card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-md);
    }
    
    /* Mobile Typography */
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
    
    /* Mobile Touch Improvements */
    button, a, input, select, textarea {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Prevent zoom on input focus */
    input, select, textarea {
        font-size: 16px;
    }
    
    /* Better focus states */
    button:focus, a:focus, input:focus, select:focus, textarea:focus {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }
    
    /* Mobile overlay */
    .mobile-nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1500;
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }
    
    .mobile-nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    body.mobile-menu-open {
        overflow: hidden;
    }
}

/* ==========================================================================
   Accessibility & Dark Mode Support
   ========================================================================== */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000;
        --text-color: #000;
        --white: #fff;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-color: #e0e0e0;
        --text-muted: #aaa;
        --light-bg: #1a1a1a;
        --white: #2a2a2a;
        --border-color: #444;
    }
    
    body {
        background: var(--light-bg);
        color: var(--text-color);
    }
    
    .card {
        background: var(--white);
        color: var(--text-color);
    }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
    .main-header,
    .sidebar,
    .mobile-menu-btn,
    .btn {
        display: none !important;
    }
    
    .site-main {
        margin: 0 !important;
        padding: 0 !important;
        box-shadow: none !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #ccc !important;
    }
    
    a {
        color: #000 !important;
        text-decoration: underline !important;
    }
}