/* ==========================================
   DESIGN SYSTEM & HSL CSS VARIABLES
   ========================================== */
:root {
    /* Color Palette - Default Light Warm Editorial Theme */
    --hue: 24; /* Warm terracotta/coral base */
    
    --bg-base: hsl(var(--hue), 35%, 97%);
    --bg-surface: hsla(var(--hue), 25%, 100%, 0.85);
    --bg-surface-hover: hsla(var(--hue), 20%, 95%, 0.95);
    
    --border-color: hsla(var(--hue), 20%, 80%, 0.5);
    --border-color-hover: hsla(var(--hue), 50%, 55%, 0.6);
    
    --text-primary: hsl(var(--hue), 30%, 15%);
    --text-secondary: hsl(var(--hue), 15%, 32%);
    --text-muted: hsl(var(--hue), 10%, 52%);
    
    --accent: hsl(var(--hue), 70%, 46%); /* Premium Terracotta */
    --accent-hover: hsl(var(--hue), 80%, 38%);
    --accent-glow: hsla(var(--hue), 70%, 46%, 0.12);
    
    --success: hsl(150, 50%, 35%);
    --error: hsl(10, 70%, 45%);
    
    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-ui: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    /* Layout & Shadows */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    
    --shadow-soft: 0 10px 30px rgba(78, 62, 54, 0.05);
    --shadow-accent: 0 4px 20px hsla(var(--hue), 70%, 46%, 0.1);
    --glass-blur: blur(16px);
    
    --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Warm Dark Theme Override */
body.dark-theme {
    --bg-base: hsl(var(--hue), 22%, 10%);
    --bg-surface: hsla(var(--hue), 15%, 15%, 0.75);
    --bg-surface-hover: hsla(var(--hue), 15%, 19%, 0.9);
    
    --border-color: hsla(var(--hue), 15%, 26%, 0.6);
    --border-color-hover: hsla(var(--hue), 50%, 55%, 0.5);
    
    --text-primary: hsl(var(--hue), 20%, 94%);
    --text-secondary: hsl(var(--hue), 12%, 76%);
    --text-muted: hsl(var(--hue), 8%, 56%);
    
    --accent: hsl(var(--hue), 75%, 60%);
    --accent-hover: hsl(var(--hue), 85%, 66%);
    --accent-glow: hsla(var(--hue), 75%, 60%, 0.2);
    
    --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.25);
    --shadow-accent: 0 4px 24px hsla(var(--hue), 75%, 60%, 0.15);
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
    transition: background-color 0.6s ease, color 0.6s ease;
}

/* ==========================================
   BACKGROUND SOFT GLOW POINTS
   ========================================== */
.glow-point {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.35;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

body.dark-theme .glow-point {
    opacity: 0.15;
}

.glow-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, hsl(var(--hue), 60%, 85%), transparent 70%);
    top: -150px;
    left: -100px;
    animation: gentle-move 20s infinite alternate;
}

.glow-2 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, hsl(42, 60%, 85%), transparent 70%);
    bottom: -150px;
    right: -100px;
    animation: gentle-move 25s infinite alternate-reverse;
}

@keyframes gentle-move {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, -30px) scale(1.1); }
}

/* ==========================================
   APP HEADER
   ========================================== */
.app-header {
    position: sticky;
    top: 0;
    width: 100%;
    background-color: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    transition: var(--transition-smooth);
}

.header-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    font-family: var(--font-heading);
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    user-select: none;
}

.logo span {
    color: var(--accent);
    font-family: var(--font-ui);
    font-size: 24px;
    font-weight: 400;
    margin-left: 2px;
}

.search-box {
    position: relative;
    width: 100%;
    max-width: 360px;
}

.search-box input {
    width: 100%;
    padding: 10px 16px 10px 38px;
    background-color: hsla(var(--hue), 20%, 50%, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    outline: none;
    transition: var(--transition-smooth);
}

.search-box input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
    background-color: hsla(var(--hue), 20%, 50%, 0.02);
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 13px;
    color: var(--text-muted);
}

.theme-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.theme-btn:hover {
    border-color: var(--accent);
    background-color: var(--accent-glow);
}

.theme-icon {
    font-size: 15px;
}

/* ==========================================
   HERO BANNER
   ========================================== */
.hero-section {
    max-width: 1100px;
    margin: 40px auto 10px auto;
    padding: 0 24px;
}

.hero-content {
    background: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 50px 30px;
    text-align: center;
    box-shadow: var(--shadow-soft);
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--accent-glow);
    border: 1px solid hsla(var(--hue), 70%, 46%, 0.3);
    border-radius: 50px;
    color: var(--accent);
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: clamp(30px, 4.5vw, 42px);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.hero-content p {
    font-family: var(--font-body);
    font-size: clamp(15px, 1.8vw, 16px);
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto;
}

/* ==========================================
   CATEGORIES NAVIGATION
   ========================================== */
.categories-nav {
    max-width: 1100px;
    margin: 25px auto;
    padding: 0 24px;
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.cat-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 18px;
    border-radius: 50px;
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.cat-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-color-hover);
}

.cat-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: var(--shadow-accent);
}

/* ==========================================
   POSTS GRID & CARDS
   ========================================== */
.posts-grid {
    max-width: 1100px;
    margin: 0 auto 50px auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.post-card {
    background: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 250px;
    cursor: pointer;
    box-shadow: var(--shadow-soft);
    position: relative;
    transition: var(--transition-smooth);
}

.post-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: var(--shadow-accent), var(--shadow-soft);
}

.post-header {
    margin-bottom: 16px;
}

.post-categories {
    display: flex;
    gap: 6px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.card-badge {
    font-family: var(--font-ui);
    font-size: 10px;
    font-weight: 600;
    padding: 2px 8px;
    background: var(--accent-glow);
    color: var(--accent);
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.post-card h2 {
    font-family: var(--font-heading);
    font-size: 21px;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 10px;
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.post-card:hover h2 {
    color: var(--accent);
}

.post-card p {
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.post-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-family: var(--font-ui);
    font-size: 12px;
    color: var(--text-muted);
}

.post-date {
    display: flex;
    align-items: center;
    gap: 6px;
}

.read-more {
    font-weight: 600;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition-smooth);
}

.post-card:hover .read-more {
    transform: translateX(4px);
}

/* ==========================================
   LOADING & ERROR STATES
   ========================================== */
.loading-state, .error-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 50px 24px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    max-width: 500px;
    margin: 20px auto;
    box-shadow: var(--shadow-soft);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    margin: 0 auto 16px auto;
    animation: spin 1s linear infinite;
}

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

.error-icon {
    font-size: 32px;
    display: block;
    margin-bottom: 12px;
}

.error-state h3 {
    margin-bottom: 6px;
    font-family: var(--font-heading);
}

.error-state p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.error-state button {
    background: var(--accent);
    border: none;
    color: white;
    padding: 8px 20px;
    font-family: var(--font-ui);
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    box-shadow: var(--shadow-accent);
    transition: var(--transition-smooth);
}

.error-state button:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.hidden {
    display: none !important;
}

/* ==========================================
   FULL POST VIEW (MODAL)
   ========================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(46, 39, 36, 0.4);
    backdrop-filter: blur(6px);
}

body.dark-theme .modal-overlay {
    background: rgba(0, 0, 0, 0.6);
}

.modal-wrapper {
    background: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 720px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    z-index: 1001;
    box-shadow: var(--shadow-soft);
    animation: modalSlide 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

.close-modal {
    position: sticky;
    top: 20px;
    float: right;
    margin-right: 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 20px;
    line-height: 32px;
    text-align: center;
    cursor: pointer;
    z-index: 10;
    transition: var(--transition-smooth);
}

.close-modal:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}

.modal-body {
    padding: 40px 30px;
}

.modal-body .post-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    font-family: var(--font-ui);
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.modal-body h1 {
    font-family: var(--font-heading);
    font-size: clamp(24px, 3.5vw, 32px);
    line-height: 1.25;
    margin-bottom: 20px;
    font-weight: 700;
}

.modal-body .post-content {
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.modal-body .post-content p {
    margin-bottom: 16px;
}

/* ==========================================
   APP FOOTER
   ========================================== */
.app-footer {
    border-top: 1px solid var(--border-color);
    background: var(--bg-surface);
    padding: 24px 20px;
    text-align: center;
}

.footer-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-family: var(--font-ui);
    font-size: 13px;
    color: var(--text-secondary);
}

.footer-meta {
    color: var(--text-muted);
    font-size: 11px;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .logo {
        text-align: center;
        margin-bottom: 8px;
    }
    
    .search-box {
        max-width: 100%;
    }
    
    .hero-content {
        padding: 30px 20px;
    }
    
    .modal-body {
        padding: 24px 16px;
    }
}