/* ============================================================
   LEARNING — THE CORRODING WEB
   ============================================================ */

:root {
    --bg-black: #050505;
    --intel-gray: #1a1a1a;
    --text-white: #f5f5f5;
    --text-muted: #888;
    --accent-green: #00c853;
    --accent-border: #222;
    --alert-red: #aa0000;
    --nav-height: 64px;
}

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

html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    background-color: var(--bg-black);
    color: var(--text-white);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Emergency Alert ── */
.emergency-alert {
    background-color: var(--alert-red);
    color: #fff;
    text-align: center;
    padding: 10px 16px;
    font-size: 0.7rem;
    font-weight: 900;
    letter-spacing: 1px;
    line-height: 1.4;
}

/* ── Navigation ── */
.intel-nav {
    border-bottom: 1px solid var(--accent-border);
    background: rgba(5, 5, 5, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    overflow: visible;
}

.nav-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.brand {
    font-weight: 900;
    letter-spacing: 2px;
    font-size: 0.85rem;
    white-space: nowrap;
    flex-shrink: 0;
    color: var(--text-white);
    cursor: default;
    user-select: none;
}

.brand-sub {
    color: var(--accent-green);
    font-size: 0.65rem;
    letter-spacing: 3px;
    margin-left: 10px;
    font-weight: 700;
}

.menu { display: none !important; }

.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: 1px solid var(--accent-border);
    cursor: pointer;
    padding: 10px 12px;
    z-index: 1100;
    transition: border-color 0.2s;
}

.hamburger:hover { border-color: #555; }

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-white);
    transition: transform 0.3s, opacity 0.3s;
    transform-origin: center;
}

@media (max-width: 768px) {
    .hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.open span:nth-child(2) { opacity: 0; }
    .hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #050505;
    z-index: 2000;
    flex-direction: column;
    justify-content: center;
    padding: 0 30px;
    overflow-y: auto;
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 900;
    letter-spacing: 2px;
    padding: 16px 0;
    border-bottom: 1px solid var(--accent-border);
    display: block;
    transition: color 0.2s;
}

.mobile-menu a:last-child { border-bottom: none; }

.mobile-menu a:hover,
.mobile-menu a.active { color: var(--text-white); }

.mobile-menu a.active::before {
    content: '→ ';
    color: var(--accent-green);
}

.mobile-section-label {
    font-size: 0.6rem;
    letter-spacing: 5px;
    color: #333;
    margin-bottom: 16px;
    text-transform: uppercase;
    display: block;
}

@media (min-width: 769px) {
    .mobile-menu {
        position: fixed;
        top: auto;
        left: auto;
        width: 190px;
        height: auto;
        background: #0c0c0c;
        border: 1px solid var(--accent-border);
        z-index: 2000;
        flex-direction: column;
        justify-content: flex-start;
        padding: 6px 0;
        box-shadow: 0 16px 40px rgba(0,0,0,0.8);
        overflow-y: visible;
    }

    .mobile-menu a {
        font-size: 0.72rem;
        font-weight: 700;
        letter-spacing: 1.5px;
        padding: 11px 18px;
        border-bottom: 1px solid #161616;
    }

    .mobile-menu a:last-child { border-bottom: none; }
    .mobile-menu a:hover { background: rgba(255,255,255,0.03); }
    .mobile-menu a.active::before { content: ""; }
    .mobile-section-label { display: none; }
}

/* ── Hero ── */
.hero-portal {
    padding: clamp(70px, 12vw, 130px) 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    text-align: center;
    background: #050505;
    overflow: hidden;
}

.topographic-overlay {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 1.5px 1.5px, #151515 1px, transparent 0);
    background-size: 30px 30px;
    pointer-events: none;
}

.hero-text {
    position: relative;
    z-index: 10;
    max-width: 900px;
    width: 100%;
}

h1 {
    font-size: clamp(2rem, 6vw, 4rem);
    line-height: 1.1;
    font-weight: 900;
    letter-spacing: -1px;
    margin-bottom: 20px;
}

h1 .accent { color: var(--accent-green); }

.sub-line {
    color: var(--text-muted);
    max-width: 680px;
    margin: 0 auto 40px;
    font-size: clamp(0.9rem, 2vw, 1.05rem);
    line-height: 1.7;
}

.hero-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.primary-btn {
    padding: 14px 32px;
    background: #fff;
    color: #000;
    text-decoration: none;
    font-weight: 900;
    font-size: 0.72rem;
    letter-spacing: 1px;
    display: inline-block;
    transition: opacity 0.2s;
    white-space: nowrap;
}
.primary-btn:hover { opacity: 0.85; }

.secondary-btn {
    padding: 14px 32px;
    border: 1px solid var(--accent-border);
    color: #fff;
    text-decoration: none;
    font-weight: 900;
    font-size: 0.72rem;
    letter-spacing: 1px;
    display: inline-block;
    transition: border-color 0.2s;
    white-space: nowrap;
}
.secondary-btn:hover { border-color: #555; }

.green-btn {
    padding: 14px 32px;
    border: 1px solid var(--accent-green);
    color: var(--accent-green);
    text-decoration: none;
    font-weight: 900;
    font-size: 0.72rem;
    letter-spacing: 1px;
    display: inline-block;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
}
.green-btn:hover { background: var(--accent-green); color: #000; }

/* ── Container & Grid ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.section-title {
    font-size: 0.68rem;
    color: var(--accent-green);
    letter-spacing: 5px;
    margin-top: clamp(50px, 8vw, 80px);
    margin-bottom: clamp(30px, 5vw, 50px);
    text-align: center;
    text-transform: uppercase;
}

/* ── Article cards ── */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
    gap: 20px;
    margin-bottom: clamp(50px, 8vw, 80px);
}

.article-card {
    border: 1px solid var(--accent-border);
    padding: clamp(24px, 4vw, 36px);
    position: relative;
    background: #080808;
    transition: border-color 0.3s;
}

.article-card:hover { border-color: #444; }

.card-tag {
    display: inline-block;
    font-size: 0.58rem;
    font-weight: 900;
    letter-spacing: 3px;
    color: var(--accent-green);
    text-transform: uppercase;
    margin-bottom: 12px;
    padding: 4px 10px;
    border: 1px solid rgba(0,200,83,0.3);
}

.article-card h3 {
    font-size: 1.05rem;
    font-weight: 900;
    letter-spacing: 0.3px;
    margin-bottom: 12px;
    line-height: 1.3;
}

.article-card p {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.65;
    margin-bottom: 16px;
}

.article-card .read-more {
    display: inline-block;
    color: var(--accent-green);
    text-decoration: none;
    font-size: 0.68rem;
    font-weight: 900;
    letter-spacing: 2px;
    border-bottom: 1px solid var(--accent-green);
    padding-bottom: 2px;
    transition: opacity 0.2s;
}
.article-card .read-more:hover { opacity: 0.7; }

/* ── Article page ── */
.article-header {
    padding: clamp(60px, 10vw, 100px) 20px clamp(30px, 5vw, 50px);
    border-bottom: 1px solid var(--accent-border);
    text-align: center;
}

.article-header .card-tag { margin-bottom: 16px; }

.article-header h1 {
    font-size: clamp(1.6rem, 4vw, 2.8rem);
    max-width: 800px;
    margin: 0 auto 16px;
}

.article-header .article-meta {
    color: #555;
    font-size: 0.72rem;
    letter-spacing: 2px;
}

.article-body {
    max-width: 780px;
    margin: 0 auto;
    padding: clamp(30px, 5vw, 50px) 20px;
}

.article-body h2 {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    font-weight: 900;
    letter-spacing: -0.3px;
    margin: clamp(30px, 5vw, 48px) 0 16px;
    color: var(--text-white);
}

.article-body h3 {
    font-size: 0.95rem;
    font-weight: 900;
    margin: 24px 0 10px;
    color: var(--accent-green);
    letter-spacing: 0.5px;
}

.article-body p {
    color: var(--text-muted);
    font-size: clamp(0.9rem, 2vw, 1rem);
    line-height: 1.8;
    margin-bottom: 16px;
}

.article-body ul, .article-body ol {
    margin: 0 0 20px 20px;
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.8;
}

.article-body li { margin-bottom: 8px; }

.article-body strong { color: var(--text-white); }

.article-body a {
    color: var(--accent-green);
    text-decoration: none;
    border-bottom: 1px solid rgba(0,200,83,0.4);
    transition: border-color 0.2s;
}
.article-body a:hover { border-color: var(--accent-green); }

.callout-box {
    border: 1px solid var(--accent-green);
    padding: clamp(20px, 3vw, 32px);
    margin: 24px 0;
    background: rgba(0,200,83,0.03);
}

.callout-box h4 {
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 3px;
    color: var(--accent-green);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.callout-box p, .callout-box ul {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.7;
    margin-bottom: 0;
}

.callout-box ul { margin-left: 16px; }
.callout-box li { margin-bottom: 4px; }

.story-box {
    border-left: 3px solid var(--accent-green);
    padding: 20px 24px;
    margin: 24px 0;
    background: rgba(0,200,83,0.02);
    font-style: italic;
}

.story-box p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 8px;
}

.story-box .story-label {
    font-style: normal;
    font-size: 0.62rem;
    font-weight: 900;
    letter-spacing: 3px;
    color: var(--accent-green);
    text-transform: uppercase;
    display: block;
    margin-bottom: 10px;
}

.back-link {
    display: inline-block;
    margin: 40px 0 0;
    color: var(--accent-green);
    text-decoration: none;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 1px;
    transition: opacity 0.2s;
}
.back-link:hover { opacity: 0.7; }

/* ── Tip grid ── */
.tip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
    gap: 16px;
    margin: 20px 0 30px;
}

.tip-item {
    border: 1px solid var(--accent-border);
    padding: 20px;
    background: #0a0a0a;
}

.tip-item h4 {
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    color: var(--text-white);
}

.tip-item p {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0;
}

/* ── Cross-link banner ── */
.cross-link-banner {
    border: 1px solid var(--accent-border);
    padding: clamp(24px, 4vw, 40px);
    margin: clamp(40px, 6vw, 60px) 0;
    background: #080808;
    text-align: center;
}

.cross-link-banner h3 {
    font-size: 1rem;
    font-weight: 900;
    margin-bottom: 10px;
}

.cross-link-banner p {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 20px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* ── Footer ── */
.intel-footer {
    padding: clamp(40px, 6vw, 60px) 20px;
    text-align: center;
    border-top: 1px solid var(--accent-border);
    color: #444;
    font-size: 0.65rem;
    letter-spacing: 1px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #666;
    text-decoration: none;
    transition: color 0.2s;
}
.footer-links a:hover { color: #fff; }

/* ── Responsive ── */
@media (max-width: 480px) {
    .emergency-alert { font-size: 0.62rem; }
    h1 { letter-spacing: -0.5px; }
    .hero-btns { flex-direction: column; align-items: center; }
    .primary-btn, .secondary-btn, .green-btn { width: 100%; max-width: 300px; text-align: center; }
    .article-grid { grid-template-columns: 1fr; }
    .tip-grid { grid-template-columns: 1fr; }
}

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