/*
Theme Name: N₂OArctic
Theme URI: https://n2oarctic.ru
Author: N₂OArctic Science
Description: Полярный научный журнал о закиси азота — криосфера, климат, арктические экосистемы. Наука с холодным умом.
Version: 1.0.0
Tags: full-width-template, custom-colors, science, environment, magazine
Text Domain: n2oarctic
*/

/* ============================================================
   CSS CUSTOM PROPERTIES — ARCTIC PALETTE
   ============================================================ */
:root {
    --ice-white:    #f0f8ff;
    --arctic-blue:  #0369a1;
    --glacier:      #38bdf8;
    --midnight:     #0c1445;
    --light-panel:  #e0f2fe;
    --border-blue:  #bae6fd;
    --ink:          #0f172a;
    --muted:        #64748b;
    --card-bg:      #ffffff;
    --font-head:    'Montserrat', sans-serif;
    --font-body:    'Source Serif 4', serif;
    --font-mono:    'IBM Plex Mono', monospace;
    --max-w:        1280px;
    --radius:       4px;
    --shadow:       0 2px 12px rgba(12,20,69,0.10);
    --shadow-hover: 0 8px 32px rgba(12,20,69,0.18);
    --transition:   0.22s ease;
}

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

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

body {
    background: var(--ice-white);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--arctic-blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--glacier); }
ul, ol { list-style: none; }

/* ============================================================
   READING PROGRESS BAR
   ============================================================ */
#reading-progress {
    position: fixed;
    top: 0; left: 0;
    width: 0%;
    height: 3px;
    background: var(--glacier);
    z-index: 9999;
    transition: width 0.1s linear;
}

/* ============================================================
   LAYOUT WRAPPERS
   ============================================================ */
.arctic-container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

.arctic-main { min-height: 60vh; }

/* ============================================================
   HEADER
   ============================================================ */
.arctic-header {
    background: var(--midnight);
    position: sticky;
    top: 3px;
    z-index: 100;
    box-shadow: 0 2px 16px rgba(12,20,69,0.35);
}

.arctic-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Cg fill='none' stroke='rgba(56,189,248,0.06)' stroke-width='0.8'%3E%3Cpath d='M30 5v50M5 30h50M12.3 12.3l35.4 35.4M47.7 12.3L12.3 47.7'/%3E%3Ccircle cx='30' cy='30' r='10'/%3E%3Ccircle cx='30' cy='30' r='3'/%3E%3C/g%3E%3C/svg%3E");
    background-size: 60px 60px;
    pointer-events: none;
}

.arctic-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 16px 24px;
    position: relative;
    z-index: 1;
}

/* Logo */
.arctic-logo { display: flex; align-items: center; gap: 14px; text-decoration: none; flex-shrink: 0; }
.arctic-logo-text { display: flex; flex-direction: column; }
.arctic-logo-name {
    font-family: var(--font-head);
    font-size: 1.45rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.1;
    letter-spacing: -0.02em;
}
.arctic-logo-name span { color: var(--glacier); }
.arctic-logo-sub {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: rgba(255,255,255,0.52);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-top: 2px;
}

/* Primary Nav */
.arctic-nav { display: flex; align-items: center; gap: 6px; }
.arctic-nav a {
    color: rgba(255,255,255,0.82);
    font-family: var(--font-head);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: var(--radius);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: color var(--transition), background var(--transition);
    position: relative;
}
.arctic-nav a::after {
    content: '';
    position: absolute;
    bottom: 2px; left: 12px; right: 12px;
    height: 2px;
    background: var(--glacier);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}
.arctic-nav a:hover { color: #fff; }
.arctic-nav a:hover::after { transform: scaleX(1); }

/* Search toggle */
.arctic-search-btn {
    background: none;
    border: none;
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius);
    transition: color var(--transition);
    flex-shrink: 0;
}
.arctic-search-btn:hover { color: var(--glacier); }

/* Mobile burger */
.arctic-burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 110;
}
.arctic-burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}
.arctic-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.arctic-burger.open span:nth-child(2) { opacity: 0; }
.arctic-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Category strip */
.arctic-cat-strip {
    background: rgba(255,255,255,0.06);
    border-top: 1px solid rgba(255,255,255,0.08);
    position: relative;
    z-index: 1;
}
.arctic-cat-strip-inner {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 0 24px;
    overflow-x: auto;
    scrollbar-width: none;
}
.arctic-cat-strip-inner::-webkit-scrollbar { display: none; }
.arctic-cat-strip a {
    color: rgba(255,255,255,0.62);
    font-family: var(--font-head);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 9px 16px;
    white-space: nowrap;
    transition: color var(--transition), background var(--transition);
    border-right: 1px solid rgba(255,255,255,0.08);
}
.arctic-cat-strip a:first-child { border-left: 1px solid rgba(255,255,255,0.08); }
.arctic-cat-strip a:hover { color: var(--glacier); background: rgba(56,189,248,0.08); }

/* Mobile nav drawer */
.arctic-mobile-nav {
    display: none;
    position: fixed;
    top: 0; right: 0;
    width: min(320px, 85vw);
    height: 100vh;
    background: var(--midnight);
    z-index: 200;
    padding: 80px 28px 28px;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: -4px 0 32px rgba(0,0,0,0.4);
}
.arctic-mobile-nav.open { transform: translateX(0); }
.arctic-mobile-nav a {
    display: block;
    color: rgba(255,255,255,0.85);
    font-family: var(--font-head);
    font-size: 1rem;
    font-weight: 600;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    transition: color var(--transition);
}
.arctic-mobile-nav a:hover { color: var(--glacier); }
.arctic-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.55);
    z-index: 190;
}
.arctic-overlay.open { display: block; }

/* ============================================================
   BREADCRUMBS
   ============================================================ */
.arctic-breadcrumbs {
    padding: 12px 0;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--muted);
    letter-spacing: 0.04em;
}
.arctic-breadcrumbs a { color: var(--arctic-blue); }
.arctic-breadcrumbs a:hover { color: var(--glacier); }
.arctic-breadcrumbs span { color: var(--muted); }
.arctic-breadcrumbs .sep { margin: 0 6px; }

/* ============================================================
   HERO SECTION
   ============================================================ */
.arctic-hero {
    position: relative;
    width: 100%;
    height: clamp(420px, 60vh, 680px);
    overflow: hidden;
    background: var(--midnight);
}
.arctic-hero-image {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.arctic-hero-image svg, .arctic-hero-image img { width: 100%; height: 100%; object-fit: cover; }
.arctic-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(0deg, rgba(12,20,69,0.92) 0%, rgba(12,20,69,0.5) 45%, rgba(12,20,69,0.1) 100%);
}
.arctic-hero-content {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    padding: 48px 40px;
}
.arctic-hero-cat {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--glacier);
    background: rgba(56,189,248,0.15);
    border: 1px solid rgba(56,189,248,0.35);
    padding: 4px 12px;
    border-radius: 2px;
    margin-bottom: 16px;
}
.arctic-hero-title {
    font-family: var(--font-head);
    font-size: clamp(1.8rem, 4vw, 3.2rem);
    font-weight: 900;
    color: #fff;
    line-height: 1.15;
    max-width: 820px;
    margin-bottom: 16px;
    text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
.arctic-hero-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: rgba(255,255,255,0.6);
}
.arctic-hero-meta a { color: rgba(255,255,255,0.75); }
.arctic-hero-meta a:hover { color: var(--glacier); }

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.arctic-section-hd {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
    padding: 36px 0 0;
}
.arctic-section-hd h2 {
    font-family: var(--font-head);
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--midnight);
}
.arctic-section-hd::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-blue);
}

/* Aurora separator */
.arctic-aurora-sep {
    height: 3px;
    background: linear-gradient(90deg, #0369a1, #38bdf8, #818cf8, #a78bfa, #34d399, #38bdf8);
    background-size: 400% 100%;
    animation: aurora-shift 6s linear infinite;
    margin: 40px 0;
    border-radius: 2px;
}
@keyframes aurora-shift {
    0%   { background-position: 0% 50%; }
    100% { background-position: 400% 50%; }
}

/* ============================================================
   EDITORIAL GRID (fresh issue section)
   ============================================================ */
.arctic-editorial {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4px;
    background: var(--border-blue);
    border: 1px solid var(--border-blue);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 0;
}
.arctic-editorial-main { background: var(--card-bg); }
.arctic-editorial-stack { display: flex; flex-direction: column; gap: 4px; background: var(--border-blue); }
.arctic-editorial-sub { background: var(--card-bg); flex: 1; }

.arctic-editorial-main .ed-image,
.arctic-editorial-sub .ed-image {
    overflow: hidden;
}
.arctic-editorial-main .ed-image { height: 280px; }
.arctic-editorial-sub .ed-image { height: 160px; }
.arctic-editorial-main .ed-image img,
.arctic-editorial-main .ed-image svg,
.arctic-editorial-sub .ed-image img,
.arctic-editorial-sub .ed-image svg {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.4s ease;
}
.arctic-editorial-main:hover .ed-image img,
.arctic-editorial-main:hover .ed-image svg,
.arctic-editorial-sub:hover .ed-image img,
.arctic-editorial-sub:hover .ed-image svg { transform: scale(1.04); }

.ed-body { padding: 20px 22px 24px; }
.ed-cat {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--glacier);
    display: block;
    margin-bottom: 8px;
}
.ed-title {
    font-family: var(--font-head);
    font-weight: 700;
    color: var(--midnight);
    line-height: 1.3;
    display: block;
    transition: color var(--transition);
}
.arctic-editorial-main .ed-title { font-size: 1.35rem; }
.arctic-editorial-sub .ed-title { font-size: 1rem; }
.ed-title:hover { color: var(--arctic-blue); }
.ed-excerpt {
    color: var(--muted);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-top: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.ed-meta {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--muted);
    margin-top: 12px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* ============================================================
   ARCTIC CARD
   ============================================================ */
.arctic-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border-top: 2px solid var(--glacier);
    box-shadow: var(--shadow);
    transition: box-shadow var(--transition), transform var(--transition);
    display: flex;
    flex-direction: column;
}
.arctic-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }

.arctic-card-image {
    overflow: hidden;
    height: 192px;
    background: var(--light-panel);
    flex-shrink: 0;
}
.arctic-card-image img,
.arctic-card-image svg {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.arctic-card:hover .arctic-card-image img,
.arctic-card:hover .arctic-card-image svg { transform: scale(1.06); }

.arctic-card-body { padding: 18px 20px 22px; flex: 1; display: flex; flex-direction: column; }
.arctic-card-cat {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--glacier);
    margin-bottom: 8px;
    display: block;
}
.arctic-card-title {
    font-family: var(--font-head);
    font-size: 1rem;
    font-weight: 700;
    color: var(--midnight);
    line-height: 1.3;
    display: block;
    margin-bottom: 10px;
    transition: color var(--transition);
    flex: 1;
}
.arctic-card-title:hover { color: var(--arctic-blue); }
.arctic-card-excerpt {
    font-size: 0.845rem;
    color: var(--muted);
    line-height: 1.55;
    margin-bottom: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.arctic-card-meta {
    font-family: var(--font-mono);
    font-size: 0.64rem;
    color: var(--muted);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    border-top: 1px solid var(--border-blue);
    padding-top: 12px;
    margin-top: auto;
}
.arctic-card-meta span { display: flex; align-items: center; gap: 4px; }

/* ============================================================
   GRID LAYOUTS
   ============================================================ */
.arctic-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.arctic-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.arctic-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

/* AJAX zone */
#js-arctic-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 32px;
}
.arctic-load-wrap {
    text-align: center;
    padding: 36px 0 48px;
}
#js-load-more {
    background: var(--midnight);
    color: #fff;
    border: none;
    font-family: var(--font-head);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 14px 40px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}
#js-load-more:hover { background: var(--arctic-blue); transform: translateY(-2px); }
#js-load-more:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ============================================================
   SINGLE POST
   ============================================================ */
.single-wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

.arctic-post-header { padding: 36px 0 32px; }
.arctic-post-cat-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--glacier);
    background: var(--light-panel);
    border: 1px solid var(--border-blue);
    padding: 4px 12px;
    border-radius: 2px;
    margin-bottom: 20px;
}
.arctic-post-h1 {
    font-family: var(--font-head);
    font-size: clamp(2rem, 4.5vw, 3.5rem);
    font-weight: 900;
    color: var(--midnight);
    line-height: 1.12;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}
.arctic-post-subtitle {
    font-family: var(--font-body);
    font-size: 1.2rem;
    color: var(--muted);
    line-height: 1.6;
    font-style: italic;
    max-width: 740px;
    margin-bottom: 24px;
}
.arctic-byline {
    display: flex;
    align-items: center;
    gap: 20px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--muted);
    flex-wrap: wrap;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-blue);
}
.arctic-byline strong { color: var(--midnight); }

/* Full-width hero image */
.arctic-post-hero {
    width: 100vw;
    margin-left: calc(50% - 50vw);
    height: clamp(280px, 45vw, 520px);
    overflow: hidden;
    background: var(--light-panel);
    margin-bottom: 48px;
}
.arctic-post-hero img,
.arctic-post-hero svg { width: 100%; height: 100%; object-fit: cover; }

/* Article body */
.article-body {
    max-width: 780px;
    margin: 0 auto;
    font-size: 1.08rem;
    line-height: 1.82;
}
.article-body p { margin-bottom: 1.4em; }
.article-body h2 {
    font-family: var(--font-head);
    font-size: 1.55rem;
    font-weight: 800;
    color: var(--midnight);
    margin: 2em 0 0.6em;
    line-height: 1.2;
}
.article-body h3 {
    font-family: var(--font-head);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--midnight);
    margin: 1.6em 0 0.5em;
}
.article-body ul, .article-body ol {
    padding-left: 1.5em;
    margin-bottom: 1.4em;
    list-style: disc;
}
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 0.4em; }
.article-body a { color: var(--arctic-blue); text-decoration: underline; text-underline-offset: 2px; }
.article-body blockquote {
    border-left: 4px solid var(--glacier);
    margin: 1.8em 0;
    padding: 14px 24px;
    background: var(--light-panel);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--muted);
    font-style: italic;
}
.article-body code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--light-panel);
    padding: 2px 6px;
    border-radius: 3px;
}

/* Drop cap */
.article-body > p:first-of-type::first-letter {
    float: left;
    font-family: var(--font-head);
    font-size: 4.2rem;
    font-weight: 900;
    line-height: 0.82;
    color: var(--arctic-blue);
    margin: 4px 12px 0 0;
    text-transform: uppercase;
}

/* Pull quote */
.arctic-pullquote {
    border-left: 5px solid var(--arctic-blue);
    margin: 2.5em 0;
    padding: 20px 28px;
    background: var(--light-panel);
}
.arctic-pullquote p {
    font-family: var(--font-head);
    font-size: 1.35rem;
    font-style: italic;
    color: var(--midnight);
    line-height: 1.4;
    margin: 0;
}

/* Data box */
.arctic-data-box {
    max-width: 780px;
    margin: 3em auto;
    background: var(--midnight);
    border-radius: var(--radius);
    padding: 28px 32px;
    color: #fff;
}
.arctic-data-box-title {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--glacier);
    margin-bottom: 20px;
}
.arctic-data-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.arctic-data-stat-val {
    font-family: var(--font-head);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--glacier);
    display: block;
    line-height: 1;
}
.arctic-data-stat-lbl {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: rgba(255,255,255,0.55);
    line-height: 1.4;
    margin-top: 6px;
    display: block;
}

/* Tags row */
.arctic-tags {
    max-width: 780px;
    margin: 2em auto 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 20px 0;
    border-top: 1px solid var(--border-blue);
}
.arctic-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--arctic-blue);
    background: var(--light-panel);
    border: 1px solid var(--border-blue);
    padding: 4px 12px;
    border-radius: 20px;
    transition: background var(--transition), color var(--transition);
}
.arctic-tag:hover { background: var(--arctic-blue); color: #fff; }

/* Share */
.arctic-share {
    max-width: 780px;
    margin: 24px auto;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.arctic-share-lbl {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    margin-right: 4px;
}
.arctic-share-btn {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 7px 18px;
    border-radius: 20px;
    border: 1px solid var(--border-blue);
    background: #fff;
    color: var(--midnight);
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
    text-decoration: none;
    display: inline-block;
}
.arctic-share-btn:hover { background: var(--midnight); color: #fff; border-color: var(--midnight); }

/* Author box */
.arctic-author-box {
    max-width: 780px;
    margin: 40px auto;
    background: var(--light-panel);
    border: 1px solid var(--border-blue);
    border-radius: var(--radius);
    padding: 28px 32px;
    display: flex;
    align-items: flex-start;
    gap: 24px;
}
.arctic-author-box-avatar {
    width: 72px; height: 72px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    background: var(--midnight);
    border: 3px solid var(--glacier);
}
.arctic-author-box-avatar svg, .arctic-author-box-avatar img { width: 100%; height: 100%; }
.arctic-author-box-name {
    font-family: var(--font-head);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--midnight);
}
.arctic-author-box-title {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--glacier);
    letter-spacing: 0.08em;
    margin: 4px 0 8px;
}
.arctic-author-box-bio {
    font-size: 0.875rem;
    color: var(--muted);
    line-height: 1.65;
}

/* Related posts */
.arctic-related {
    max-width: var(--max-w);
    margin: 48px auto;
    padding: 0 24px;
    border-top: 1px solid var(--border-blue);
    padding-top: 40px;
}
.arctic-related h3 {
    font-family: var(--font-head);
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--midnight);
    margin-bottom: 24px;
}

/* ============================================================
   CATEGORY PAGE
   ============================================================ */
.arctic-cat-hero {
    width: 100vw;
    margin-left: calc(50% - 50vw);
    background: linear-gradient(135deg, var(--midnight) 0%, #0a2540 50%, #0369a1 100%);
    padding: 56px 24px 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.arctic-cat-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(56,189,248,0.06) 0%, rgba(129,140,248,0.06) 50%, rgba(52,211,153,0.06) 100%);
}
.arctic-cat-hero-inner { position: relative; max-width: 640px; margin: 0 auto; }
.arctic-cat-hero-name {
    font-family: var(--font-head);
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 900;
    color: #fff;
    margin-bottom: 12px;
}
.arctic-cat-hero-desc { color: rgba(255,255,255,0.72); font-size: 1.05rem; line-height: 1.6; margin-bottom: 16px; }
.arctic-cat-hero-count {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    color: var(--glacier);
    text-transform: uppercase;
}

/* ============================================================
   AUTHOR PAGE
   ============================================================ */
.arctic-author-hero {
    background: var(--midnight);
    padding: 56px 24px 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.arctic-author-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80'%3E%3Cg fill='none' stroke='rgba(56,189,248,0.05)' stroke-width='0.8'%3E%3Cpath d='M40 5v70M5 40h70M16.7 16.7l46.6 46.6M63.3 16.7L16.7 63.3'/%3E%3C/g%3E%3C/svg%3E");
    background-size: 80px 80px;
}
.arctic-author-hero-inner { position: relative; max-width: 760px; margin: 0 auto; }
.arctic-author-avatar-wrap {
    width: 120px; height: 120px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 24px;
    background: rgba(56,189,248,0.15);
    border: 4px solid var(--glacier);
    display: flex; align-items: center; justify-content: center;
}
.arctic-author-hero-name {
    font-family: var(--font-head);
    font-size: 2.2rem;
    font-weight: 900;
    color: #fff;
    margin-bottom: 6px;
}
.arctic-author-hero-title {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--glacier);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 20px;
}
.arctic-author-hero-bio {
    color: rgba(255,255,255,0.72);
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 640px;
    margin: 0 auto 28px;
}
.arctic-author-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}
.arctic-author-stat-val {
    display: block;
    font-family: var(--font-head);
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--glacier);
}
.arctic-author-stat-lbl {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.arctic-specialties {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 24px;
}
.arctic-specialty {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: rgba(255,255,255,0.75);
    background: rgba(56,189,248,0.12);
    border: 1px solid rgba(56,189,248,0.25);
    padding: 5px 14px;
    border-radius: 20px;
}

/* ============================================================
   SEARCH PAGE
   ============================================================ */
.arctic-search-header {
    padding: 40px 0 32px;
    border-bottom: 1px solid var(--border-blue);
    margin-bottom: 32px;
}
.arctic-search-title {
    font-family: var(--font-head);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--midnight);
}
.arctic-search-title em {
    color: var(--arctic-blue);
    font-style: normal;
}
.arctic-search-count {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--muted);
    margin-top: 6px;
    letter-spacing: 0.06em;
}

/* ============================================================
   404 PAGE
   ============================================================ */
.arctic-404 {
    text-align: center;
    padding: 80px 24px;
    max-width: 640px;
    margin: 0 auto;
}
.arctic-404-svg { margin: 0 auto 32px; max-width: 240px; }
.arctic-404-code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--glacier);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.arctic-404-h1 {
    font-family: var(--font-head);
    font-size: 2.4rem;
    font-weight: 900;
    color: var(--midnight);
    margin-bottom: 16px;
    line-height: 1.15;
}
.arctic-404-fact {
    background: var(--light-panel);
    border: 1px solid var(--border-blue);
    border-radius: var(--radius);
    padding: 18px 24px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--muted);
    margin: 24px 0 32px;
    line-height: 1.6;
}
.arctic-404-links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.arctic-404-links a {
    font-family: var(--font-head);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 12px 28px;
    border-radius: var(--radius);
    transition: background var(--transition), color var(--transition);
}
.arctic-404-links .btn-primary { background: var(--midnight); color: #fff; }
.arctic-404-links .btn-primary:hover { background: var(--arctic-blue); }
.arctic-404-links .btn-secondary { background: var(--light-panel); color: var(--midnight); border: 1px solid var(--border-blue); }
.arctic-404-links .btn-secondary:hover { background: var(--border-blue); }

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.aurora-hero {
    width: 100vw;
    margin-left: calc(50% - 50vw);
    padding: 80px 24px;
    text-align: center;
    background: var(--midnight);
    position: relative;
    overflow: hidden;
}
.aurora-hero::before {
    content: '';
    position: absolute;
    top: 0; left: -50%;
    width: 200%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(56,189,248,0.12) 20%, rgba(167,139,250,0.10) 40%, rgba(52,211,153,0.10) 60%, rgba(56,189,248,0.08) 80%, transparent);
    animation: aurora-wave 8s ease-in-out infinite;
}
@keyframes aurora-wave {
    0%   { transform: translateX(-20%) skewX(-5deg); opacity: 0.7; }
    50%  { transform: translateX(10%)  skewX(5deg);  opacity: 1;   }
    100% { transform: translateX(-20%) skewX(-5deg); opacity: 0.7; }
}
.aurora-hero-inner { position: relative; max-width: 780px; margin: 0 auto; }
.aurora-hero h1 {
    font-family: var(--font-head);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    color: #fff;
    line-height: 1.1;
    margin-bottom: 20px;
}
.aurora-hero p { color: rgba(255,255,255,0.72); font-size: 1.1rem; line-height: 1.7; }

.about-topics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 40px 0;
}
.about-topic-card {
    background: var(--light-panel);
    border: 1px solid var(--border-blue);
    border-radius: var(--radius);
    padding: 24px;
    border-top: 3px solid var(--glacier);
}
.about-topic-card h3 {
    font-family: var(--font-head);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--midnight);
    margin-bottom: 8px;
}
.about-topic-card p { font-size: 0.875rem; color: var(--muted); line-height: 1.6; }

.about-data-card {
    background: var(--midnight);
    border-radius: var(--radius);
    padding: 32px;
    color: #fff;
    margin: 40px 0;
}
.about-data-card h3 {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--glacier);
    margin-bottom: 24px;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 32px 0;
}
.team-card {
    background: var(--light-panel);
    border: 1px solid var(--border-blue);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
}
.team-avatar {
    width: 72px; height: 72px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 16px;
    background: var(--midnight);
    border: 3px solid var(--glacier);
    display: flex; align-items: center; justify-content: center;
}
.team-name {
    font-family: var(--font-head);
    font-weight: 700;
    color: var(--midnight);
    font-size: 1rem;
}
.team-role {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--glacier);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin: 6px 0 10px;
}
.team-desc { font-size: 0.845rem; color: var(--muted); line-height: 1.55; }

/* ============================================================
   POLAR GUIDE PAGE
   ============================================================ */
.guide-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin: 40px 0;
}
.guide-card {
    background: var(--card-bg);
    border: 1px solid var(--border-blue);
    border-radius: var(--radius);
    padding: 24px 26px;
    display: flex;
    gap: 18px;
    align-items: flex-start;
    transition: box-shadow var(--transition), border-color var(--transition);
}
.guide-card:hover { box-shadow: var(--shadow); border-color: var(--glacier); }
.guide-num {
    font-family: var(--font-head);
    font-size: 2rem;
    font-weight: 900;
    color: var(--border-blue);
    line-height: 1;
    flex-shrink: 0;
    min-width: 44px;
}
.guide-title {
    font-family: var(--font-head);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--midnight);
    margin-bottom: 8px;
}
.guide-desc { font-size: 0.845rem; color: var(--muted); line-height: 1.6; }

/* ============================================================
   FOOTER
   ============================================================ */
.arctic-footer {
    background: var(--midnight);
    color: rgba(255,255,255,0.72);
    margin-top: 64px;
}
.arctic-footer-aurora {
    height: 3px;
    background: linear-gradient(90deg, #0369a1, #38bdf8, #818cf8, #a78bfa, #34d399);
    background-size: 300% 100%;
    animation: aurora-shift 5s linear infinite;
}
.arctic-footer-main {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
    gap: 48px;
    padding: 56px 24px 40px;
    max-width: var(--max-w);
    margin: 0 auto;
}
.arctic-footer-brand { }
.arctic-footer-logo {
    font-family: var(--font-head);
    font-size: 1.4rem;
    font-weight: 900;
    color: #fff;
    display: block;
    margin-bottom: 12px;
}
.arctic-footer-logo span { color: var(--glacier); }
.arctic-footer-tagline {
    font-size: 0.875rem;
    line-height: 1.65;
    color: rgba(255,255,255,0.55);
    margin-bottom: 20px;
}
.arctic-footer-socials { display: flex; gap: 10px; flex-wrap: wrap; }
.arctic-footer-social {
    width: 36px; height: 36px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: rgba(255,255,255,0.6);
    font-size: 0.7rem;
    font-family: var(--font-mono);
    font-weight: 600;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.arctic-footer-social:hover { border-color: var(--glacier); color: var(--glacier); background: rgba(56,189,248,0.1); }
.arctic-footer-col h4 {
    font-family: var(--font-head);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.4);
    margin-bottom: 16px;
}
.arctic-footer-col ul li { margin-bottom: 10px; }
.arctic-footer-col ul li a {
    color: rgba(255,255,255,0.62);
    font-size: 0.875rem;
    transition: color var(--transition);
}
.arctic-footer-col ul li a:hover { color: var(--glacier); }

/* Subscribe */
.arctic-footer-sub p { font-size: 0.845rem; color: rgba(255,255,255,0.55); margin-bottom: 14px; line-height: 1.6; }
.arctic-footer-input-wrap { display: flex; gap: 8px; }
.arctic-footer-input-wrap input {
    flex: 1;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius);
    padding: 10px 14px;
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    outline: none;
    transition: border-color var(--transition);
}
.arctic-footer-input-wrap input::placeholder { color: rgba(255,255,255,0.35); }
.arctic-footer-input-wrap input:focus { border-color: var(--glacier); }
.arctic-footer-input-wrap button {
    background: var(--glacier);
    color: var(--midnight);
    border: none;
    border-radius: var(--radius);
    padding: 10px 16px;
    font-family: var(--font-head);
    font-size: 0.72rem;
    font-weight: 700;
    cursor: pointer;
    transition: background var(--transition);
}
.arctic-footer-input-wrap button:hover { background: #7dd3fc; }

.arctic-footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 18px 24px;
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: rgba(255,255,255,0.35);
}
.arctic-footer-bottom a { color: rgba(255,255,255,0.5); transition: color var(--transition); }
.arctic-footer-bottom a:hover { color: var(--glacier); }
.arctic-footer-bottom-links { display: flex; gap: 20px; flex-wrap: wrap; }
.arctic-monitor { color: var(--glacier); font-weight: 600; }

/* ============================================================
   PAGINATION
   ============================================================ */
.arctic-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 40px 0 48px;
    flex-wrap: wrap;
}
.arctic-pagination a,
.arctic-pagination span {
    display: flex; align-items: center; justify-content: center;
    min-width: 40px; height: 40px;
    padding: 0 12px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-blue);
    background: #fff;
    color: var(--midnight);
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.arctic-pagination a:hover { background: var(--arctic-blue); color: #fff; border-color: var(--arctic-blue); }
.arctic-pagination span.current { background: var(--midnight); color: #fff; border-color: var(--midnight); }

/* ============================================================
   PAGE GENERIC
   ============================================================ */
.arctic-page-header {
    padding: 48px 0 32px;
    border-bottom: 1px solid var(--border-blue);
    margin-bottom: 40px;
}
.arctic-page-h1 {
    font-family: var(--font-head);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    color: var(--midnight);
}
.arctic-page-body {
    max-width: 820px;
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.8;
}
.arctic-page-body h2 {
    font-family: var(--font-head);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--midnight);
    margin: 2em 0 0.5em;
}
.arctic-page-body p { margin-bottom: 1.3em; }

/* ============================================================
   UTILITY
   ============================================================ */
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.text-center { text-align: center; }


.arctic-card.reveal-ready { opacity: 1; transform: translateY(20px); }
.arctic-card.reveal-ready.in-view,
.arctic-card.reveal-ready.visible { opacity: 1; transform: translateY(0); }
.arctic-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
    .arctic-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .arctic-editorial { grid-template-columns: 1fr; }
    .arctic-editorial-stack { flex-direction: row; }
    .arctic-editorial-sub .ed-image { height: 140px; }
    .arctic-footer-main { grid-template-columns: 1fr 1fr; gap: 36px; }
    .arctic-data-stats { grid-template-columns: repeat(2, 1fr); }
    .about-topics-grid { grid-template-columns: repeat(2, 1fr); }
    .team-grid { grid-template-columns: repeat(2, 1fr); }
    .guide-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .arctic-header-inner { padding: 12px 16px; }
    .arctic-nav { display: none; }
    .arctic-burger { display: flex; }
    .arctic-mobile-nav { display: block; }
    .arctic-grid-3, #js-arctic-grid { grid-template-columns: repeat(2, 1fr); }
    .arctic-grid-4 { grid-template-columns: 1fr; }
    .arctic-footer-main { grid-template-columns: 1fr; gap: 28px; }
    .arctic-post-h1 { font-size: 2rem; }
    .arctic-data-stats { grid-template-columns: repeat(2, 1fr); }
    .about-topics-grid { grid-template-columns: 1fr; }
    .team-grid { grid-template-columns: 1fr; }
    .arctic-author-box { flex-direction: column; }
    .arctic-editorial-stack { flex-direction: column; }
    .arctic-footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
    .arctic-grid-3, #js-arctic-grid { grid-template-columns: 1fr; }
    .arctic-container { padding: 0 16px; }
    .arctic-hero-content { padding: 28px 16px; }
    .arctic-data-stats { grid-template-columns: 1fr; }
    .arctic-author-stats { gap: 20px; }
    .arctic-cat-strip-inner { padding: 0 16px; }
}