/* ============================================================
   Prefa News — main.css
   Structure: Reset → Tokens → Layout → Header → Breaking →
              Hero → Sidebar → Grid → Cards → Infinite → Responsive
   ============================================================ */

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

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

a {
    text-decoration: none;
    color: inherit;
}

/* Tokens */
:root {
    --blue-primary:   #1a5fa8;
    --blue-dark:      #0e3460;
    --blue-light:     #e8f1fb;
    --text-primary:   #1a1a1a;
    --text-secondary: #5f5e5a;
    --text-muted:     #888780;
    --bg-page:        #f4f4f2;
    --bg-surface:     #ffffff;
    --bg-hover:       #f1efe8;
    --border:         rgba(0, 0, 0, 0.1);
    --border-hover:   rgba(0, 0, 0, 0.2);
    --radius-sm:      6px;
    --radius-md:      8px;
    --radius-lg:      12px;
    --font-sans:      system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
}

/* Base */
body {
    font-family: var(--font-sans);
    background: var(--bg-page);
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ============================================================
   Header
   ============================================================ */

.pn-header {
    background: var(--bg-surface);
    border-bottom: 2px solid var(--blue-primary);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0 1.5rem;
}

.pn-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    gap: 1.5rem;
}

.pn-logo {
    font-size: 20px;
    font-weight: 500;
    color: var(--blue-primary);
    letter-spacing: -0.5px;
    white-space: nowrap;
    flex-shrink: 0;
}

.pn-logo-accent {
    color: var(--blue-primary);
    font-weight: 500;
    font-size: 20px;
}

.pn-logo-sub {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 13px;
    margin-left: 8px;
}

.pn-nav {
    display: flex;
    gap: 4px;
    flex: 1;
}

.pn-nav a {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 6px 10px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

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

.pn-nav a.active {
    color: var(--blue-primary);
    font-weight: 500;
}

.pn-search {
    font-size: 13px;
    padding: 6px 12px;
    border: 0.5px solid var(--border-hover);
    border-radius: var(--radius-md);
    background: var(--bg-hover);
    color: var(--text-primary);
    width: 180px;
    outline: none;
    transition: border-color 0.15s, background 0.15s;
}

.pn-search:focus {
    border-color: var(--blue-primary);
    background: var(--bg-surface);
}

.pn-search::placeholder {
    color: var(--text-muted);
}

/* ============================================================
   Breaking bar
   ============================================================ */

.pn-breaking {
    background: var(--blue-primary);
    color: #fff;
    font-size: 12px;
    padding: 6px 1.5rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.pn-breaking-label {
    background: #fff;
    color: var(--blue-primary);
    font-weight: 500;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 3px;
    white-space: nowrap;
    flex-shrink: 0;
}

.pn-breaking-text {
    opacity: 0.92;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity 0.3s;
}

/* ============================================================
   Main container
   ============================================================ */

.pn-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* ============================================================
   Section title
   ============================================================ */

.pn-section-title {
    font-size: 12px;
    font-weight: 500;
    color: var(--blue-primary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    border-left: 3px solid var(--blue-primary);
    padding-left: 10px;
    margin-bottom: 1rem;
}

/* ============================================================
   Hero
   ============================================================ */

.pn-hero {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.pn-hero-main {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--border);
    overflow: hidden;
    cursor: pointer;
    transition: border-color 0.15s;
}

.pn-hero-main:hover {
    border-color: var(--border-hover);
}

.pn-hero-img {
    width: 100%;
    height: 320px;
    object-fit: cover;
    display: block;
}

.pn-hero-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--blue-primary);
    color: #fff;
    font-size: 11px;
    font-weight: 500;
    padding: 3px 10px;
    border-radius: 3px;
}

.pn-hero-body {
    padding: 1rem;
}

.pn-hero-city {
    font-size: 11px;
    color: var(--blue-primary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.pn-hero-title {
    font-size: 18px;
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.pn-hero-meta {
    font-size: 12px;
    color: var(--text-muted);
}

/* ============================================================
   Sidebar
   ============================================================ */

.pn-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background: var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 0.5px solid var(--border);
}

.pn-sidebar-item {
    background: var(--bg-surface);
    display: flex;
    gap: 10px;
    padding: 10px;
    cursor: pointer;
    align-items: flex-start;
    transition: background 0.15s;
}

.pn-sidebar-item:hover {
    background: var(--bg-hover);
}

.pn-sidebar-thumb {
    width: 72px;
    height: 56px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
    background: var(--blue-light);
}

.pn-sidebar-info {
    flex: 1;
    min-width: 0;
}

.pn-sidebar-city {
    font-size: 10px;
    color: var(--blue-primary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 3px;
}

.pn-sidebar-title {
    font-size: 13px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.pn-sidebar-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 3px;
}

/* ============================================================
   4-column grid (latest news)
   ============================================================ */

.pn-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.pn-card {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--border);
    overflow: hidden;
    cursor: pointer;
    transition: border-color 0.15s;
}

.pn-card:hover {
    border-color: var(--border-hover);
}

.pn-card-thumb {
    width: 100%;
    height: 130px;
    object-fit: cover;
    display: block;
    background: var(--blue-light);
}

.pn-card-body {
    padding: 10px;
}

.pn-card-city {
    font-size: 10px;
    color: var(--blue-primary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 4px;
}

.pn-card-title {
    font-size: 13px;
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: 6px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.pn-card-time {
    font-size: 11px;
    color: var(--text-muted);
}

/* ============================================================
   3-column grid (wide cards)
   ============================================================ */

.pn-wide-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.pn-wide-card {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--border);
    overflow: hidden;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    transition: border-color 0.15s;
}

.pn-wide-card:hover {
    border-color: var(--border-hover);
}

.pn-wide-thumb {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block;
    background: var(--blue-light);
}

.pn-wide-body {
    padding: 12px;
    flex: 1;
}

.pn-wide-city {
    font-size: 10px;
    color: var(--blue-primary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 4px;
}

.pn-wide-title {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.45;
    margin-bottom: 6px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.pn-wide-time {
    font-size: 11px;
    color: var(--text-muted);
}

/* ============================================================
   Infinite scroll loader
   ============================================================ */

.pn-loader {
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    gap: 10px;
    color: var(--text-muted);
    font-size: 13px;
}

.pn-spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--blue-primary);
    border-radius: 50%;
    animation: pn-spin 0.7s linear infinite;
    flex-shrink: 0;
}

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

/* ============================================================
   Responsive — tablet (≤ 900px)
   ============================================================ */

@media (max-width: 900px) {
    .pn-hero {
        grid-template-columns: 1fr;
    }

    .pn-sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1px;
    }

    .pn-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .pn-wide-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .pn-search {
        display: none;
    }
}

/* ============================================================
   Responsive — mobile (≤ 600px)
   ============================================================ */

@media (max-width: 600px) {
    .pn-header-inner {
        gap: 0.75rem;
    }

    .pn-logo-sub {
        display: none;
    }

    .pn-nav {
        display: none;
    }

    .pn-hero-img {
        height: 200px;
    }

    .pn-hero-title {
        font-size: 15px;
    }

    .pn-sidebar {
        grid-template-columns: 1fr;
    }

    .pn-grid {
        grid-template-columns: 1fr;
    }

    .pn-wide-grid {
        grid-template-columns: 1fr;
    }

    .pn-main {
        padding: 1rem;
    }
}