/* ============================================
   HRV Zone — Editorial Wellness
   Premium magazine-inspired health resource
   ============================================ */

:root {
    /* Warm, sophisticated palette */
    --color-ink: #1a1816;
    --color-charcoal: #2d2926;
    --color-warm-gray: #4a4543;
    --color-stone: #6b6662;
    --color-parchment: #f5f0e8;
    --color-cream: #faf8f5;
    --color-white: #ffffff;

    /* Accent - Living terracotta */
    --color-accent: #c4634f;
    --color-accent-light: #e07a5f;
    --color-accent-glow: rgba(196, 99, 79, 0.15);

    /* Secondary - Sage wellness */
    --color-sage: #7d9a6f;
    --color-sage-light: #a3b899;

    /* Functional */
    --color-success: #7d9a6f;
    --color-warning: #d4a03c;
    --color-error: #c4634f;

    /* Typography - Modern tech */
    --font-display: 'Space Grotesk', -apple-system, sans-serif;
    --font-body: 'Inter', -apple-system, sans-serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', monospace;

    /* Spacing - Tighter for density */
    --space-xs: 0.2rem;
    --space-sm: 0.4rem;
    --space-md: 0.75rem;
    --space-lg: 1.25rem;
    --space-xl: 1.75rem;
    --space-2xl: 2.5rem;
    --space-3xl: 3.5rem;
    --space-4xl: 5rem;

    /* Layout */
    --content-width: min(52rem, 90vw);
    --wide-width: min(72rem, 92vw);
    --full-width: min(80rem, 94vw);

    /* Effects */
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* ============================================
   Reset
   ============================================ */

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

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

html {
    font-size: 18px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.75;
    color: var(--color-ink);
    background: var(--color-cream);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Subtle grain texture */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.4;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
    z-index: 1000;
    mix-blend-mode: overlay;
}

::selection {
    background: var(--color-accent);
    color: var(--color-white);
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: all 0.3s var(--ease-out);
}

a:hover {
    color: var(--color-ink);
}

/* ============================================
   Typography - Editorial Style
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.15;
    color: var(--color-ink);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 500;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
    position: relative;
}

h3 {
    font-size: 1.25rem;
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

p {
    margin-bottom: var(--space-sm);
    color: var(--color-charcoal);
}

strong {
    font-weight: 600;
    color: var(--color-ink);
}

ul, ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-lg);
}

li {
    margin-bottom: var(--space-sm);
    color: var(--color-charcoal);
}

li::marker {
    color: var(--color-accent);
}

/* ============================================
   Preview Banner
   ============================================ */

.preview-banner {
    background: var(--color-ink);
    color: var(--color-parchment);
    text-align: center;
    padding: var(--space-xs) var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

/* ============================================
   Header - Refined & Minimal
   ============================================ */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 248, 245, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(26, 24, 22, 0.08);
}

.header-inner {
    max-width: var(--full-width);
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 500;
    color: var(--color-ink);
    letter-spacing: -0.02em;
}

.site-logo:hover {
    color: var(--color-ink);
}

.logo-icon {
    height: 28px;
    width: auto;
    transition: transform 0.3s var(--ease-out);
}

.site-logo:hover .logo-icon {
    transform: scaleX(1.05);
}

.logo-text {
    font-weight: 400;
}

.site-nav {
    display: flex;
    gap: var(--space-xl);
}

.nav-link {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-warm-gray);
    letter-spacing: 0.02em;
    padding: var(--space-sm) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-ink);
    transition: width 0.4s var(--ease-out);
}

.nav-link:hover {
    color: var(--color-ink);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    width: 24px;
    height: 1.5px;
    background: var(--color-ink);
    transition: 0.3s var(--ease-out);
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
    flex: 1;
}

/* ============================================
   Homepage Hero - Dramatic Editorial
   ============================================ */

.home-hero {
    padding: var(--space-2xl) var(--space-xl) var(--space-xl);
    text-align: center;
    position: relative;
    background: linear-gradient(180deg, var(--color-cream) 0%, var(--color-parchment) 100%);
    overflow: hidden;
}

/* Decorative element */
.home-hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
    pointer-events: none;
    opacity: 0.6;
}

.home-hero-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    position: relative;
    animation: fadeUp 1s var(--ease-out);
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.home-hero h1 {
    margin-bottom: var(--space-md);
    line-height: 1.1;
    font-size: clamp(2.5rem, 6vw, 4rem);
}

/* Accent line under hero title */
.home-hero h1::after {
    content: '';
    display: block;
    width: 50px;
    height: 2px;
    background: var(--color-accent);
    margin: var(--space-md) auto 0;
}

.home-hero-description {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--color-warm-gray);
    line-height: 1.6;
    max-width: 36rem;
    margin: var(--space-lg) auto;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-ink);
    color: var(--color-parchment);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    border: none;
    cursor: pointer;
    transition: all 0.4s var(--ease-out);
}

.hero-cta:hover {
    background: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* ============================================
   Home Navigation Grid
   ============================================ */

.home-nav-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: rgba(26, 24, 22, 0.1);
    max-width: var(--wide-width);
    margin: 0 auto;
    border-top: 1px solid rgba(26, 24, 22, 0.1);
    border-bottom: 1px solid rgba(26, 24, 22, 0.1);
}

.home-nav-card {
    background: var(--color-cream);
    padding: var(--space-lg);
    text-align: left;
    text-decoration: none;
    transition: all 0.5s var(--ease-out);
    position: relative;
    overflow: hidden;
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.home-nav-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--card-image) center/cover no-repeat;
    opacity: 0.15;
    transition: all 0.5s var(--ease-out);
}

.home-nav-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: var(--color-accent);
    transition: height 0.4s var(--ease-out);
    z-index: 1;
}

.home-nav-card:hover {
    background: var(--color-parchment);
}

.home-nav-card:hover::before {
    opacity: 0.25;
    transform: scale(1.05);
}

.home-nav-card:hover::after {
    height: 100%;
}

.home-nav-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    margin: 0 0 var(--space-xs) 0;
    color: var(--color-ink);
    transition: color 0.3s var(--ease-out);
    position: relative;
    z-index: 2;
}

.home-nav-card:hover h3 {
    color: var(--color-accent);
}

.home-nav-card p {
    font-size: 0.8rem;
    color: var(--color-stone);
    margin: 0;
    line-height: 1.4;
    position: relative;
    z-index: 2;
}

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

.page-hero {
    padding: var(--space-xl) var(--space-xl) var(--space-lg);
    text-align: center;
    background: var(--color-cream);
    border-bottom: 1px solid rgba(26, 24, 22, 0.08);
}

.page-hero-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    animation: fadeUp 0.8s var(--ease-out);
}

.page-hero h1 {
    margin-bottom: var(--space-md);
}

.page-subtitle {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--color-stone);
}

/* ============================================
   Content Sections
   ============================================ */

.content-section {
    padding: var(--space-2xl) var(--space-xl);
    max-width: var(--wide-width);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-header h2 {
    margin-top: 0;
    margin-bottom: var(--space-sm);
}

.section-header h2::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background: var(--color-accent);
    margin: var(--space-md) auto 0;
}

.section-header p {
    font-family: var(--font-body);
    color: var(--color-stone);
    font-size: 1rem;
}

/* ============================================
   Cards - Editorial Style
   ============================================ */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--space-lg);
}

.card {
    background: var(--color-white);
    border: 1px solid rgba(26, 24, 22, 0.08);
    padding: var(--space-lg);
    transition: all 0.4s var(--ease-out);
    position: relative;
}

.card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--space-xl);
    right: var(--space-xl);
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease-out);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(26, 24, 22, 0.08);
}

.card:hover::after {
    transform: scaleX(1);
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.card-title a {
    color: var(--color-ink);
}

.card-title a:hover {
    color: var(--color-accent);
}

.card-meta {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-md);
}

.card-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-parchment);
    color: var(--color-stone);
    border: 1px solid rgba(26, 24, 22, 0.06);
}

.card-description {
    color: var(--color-charcoal);
    font-size: 0.95rem;
    line-height: 1.7;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
    font-size: 0.85rem;
    font-weight: 500;
    color: #a54a38;
    letter-spacing: 0.02em;
}

.card-link::after {
    content: '→';
    transition: transform 0.3s var(--ease-spring);
}

.card-link:hover::after {
    transform: translateX(6px);
}

/* ============================================
   Device Images
   ============================================ */

.device-hero-image {
    width: 100%;
    max-width: 600px;
    height: auto;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
}

.product-card-image,
.card-image {
    display: block;
    overflow: hidden;
}

.product-card-image img,
.card-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.5s var(--ease-out);
}

.product-card:hover .product-card-image img,
.card:hover .card-image img {
    transform: scale(1.05);
}

/* ============================================
   Product Cards
   ============================================ */

.product-card {
    background: var(--color-white);
    border: 1px solid rgba(26, 24, 22, 0.08);
    overflow: hidden;
    transition: all 0.4s var(--ease-out);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 24px 48px rgba(26, 24, 22, 0.1);
}

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

.product-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(26, 24, 22, 0.06);
    gap: var(--space-sm);
}

.product-name {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 500;
    margin: 0;
}

.product-name a {
    color: var(--color-ink);
}

.product-name a:hover {
    color: var(--color-accent);
}

.product-price {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-accent);
    white-space: nowrap;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-accent-glow);
    letter-spacing: 0.02em;
}

.product-specs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.spec-item {
    font-size: 0.9rem;
}

.spec-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-stone);
    display: block;
    margin-bottom: 2px;
}

.spec-value {
    color: var(--color-ink);
    font-weight: 500;
}

.product-verdict {
    font-family: var(--font-body);
    color: var(--color-charcoal);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--space-md);
    padding-left: var(--space-sm);
    border-left: 2px solid var(--color-accent);
}

.product-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    padding-top: var(--space-md);
    border-top: 1px solid rgba(26, 24, 22, 0.06);
}

/* ============================================
   Buy Buttons
   ============================================ */

.buy-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-ink);
    color: var(--color-parchment);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    margin-top: var(--space-lg);
    transition: all 0.4s var(--ease-out);
}

.buy-button:hover {
    background: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-2px);
}

.buy-button-sm {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--color-ink);
    color: var(--color-parchment);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: all 0.3s var(--ease-out);
}

.buy-button-sm:hover {
    background: var(--color-accent);
    color: var(--color-white);
}

/* ============================================
   Article Content
   ============================================ */

.article-content {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

.article-section {
    margin-bottom: var(--space-xl);
}

.article-section h2::after {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background: var(--color-accent);
    margin-top: var(--space-sm);
}

/* ============================================
   Pros & Cons
   ============================================ */

.pros-cons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.pros, .cons {
    padding: var(--space-lg);
    background: var(--color-white);
    border: 1px solid rgba(26, 24, 22, 0.08);
}

.pros {
    border-top: 3px solid var(--color-sage);
}

.cons {
    border-top: 3px solid var(--color-accent);
}

.pros-cons h4 {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--space-md);
}

.pros h4 { color: var(--color-sage); }
.cons h4 { color: var(--color-accent); }

.pros ul, .cons ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.pros li, .cons li {
    position: relative;
    padding-left: var(--space-lg);
    font-size: 0.9rem;
    margin-bottom: var(--space-sm);
}

.pros li::before {
    content: '+';
    position: absolute;
    left: 0;
    color: var(--color-sage);
    font-weight: 600;
    font-family: var(--font-mono);
}

.cons li::before {
    content: '−';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 600;
    font-family: var(--font-mono);
}

/* ============================================
   Comparison Tables
   ============================================ */

.comparison-table-wrapper {
    overflow-x: auto;
    margin: var(--space-xl) 0;
    background: var(--color-white);
    border: 1px solid rgba(26, 24, 22, 0.08);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.comparison-table th,
.comparison-table td {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    border-bottom: 1px solid rgba(26, 24, 22, 0.06);
}

.comparison-table th {
    background: var(--color-parchment);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
    color: var(--color-stone);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tbody tr {
    transition: background 0.2s var(--ease-out);
}

.comparison-table tbody tr:hover {
    background: var(--color-parchment);
}

.winner-cell {
    background: rgba(125, 154, 111, 0.1);
    color: var(--color-sage);
    font-weight: 500;
}

.comparison-note {
    display: block;
    font-size: 0.8rem;
    color: var(--color-stone);
    font-style: italic;
    margin-top: var(--space-xs);
}

/* ============================================
   Compatibility Matrix
   ============================================ */

.matrix-wrapper {
    overflow-x: auto;
    margin: var(--space-xl) 0;
}

.compatibility-matrix {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    background: var(--color-white);
    border: 1px solid rgba(26, 24, 22, 0.08);
}

.compatibility-matrix th,
.compatibility-matrix td {
    padding: var(--space-sm) var(--space-md);
    text-align: center;
    border: 1px solid rgba(26, 24, 22, 0.06);
}

.compatibility-matrix th {
    background: var(--color-parchment);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
    color: var(--color-stone);
}

.compatibility-matrix th:first-child,
.compatibility-matrix td:first-child {
    text-align: left;
    font-weight: 500;
    background: var(--color-parchment);
    position: sticky;
    left: 0;
    color: var(--color-ink);
}

.compat-full {
    color: var(--color-sage);
    font-size: 1.1rem;
}

.compat-partial {
    color: var(--color-warning);
    font-size: 1.1rem;
}

.compat-none {
    color: var(--color-stone);
    font-size: 0.9rem;
    opacity: 0.5;
}

.matrix-legend {
    display: flex;
    gap: var(--space-xl);
    justify-content: center;
    margin-top: var(--space-lg);
    font-size: 0.85rem;
    color: var(--color-stone);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* ============================================
   Matrix Filters
   ============================================ */

.matrix-filters {
    margin-bottom: var(--space-lg);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.filter-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-stone);
}

.filter-buttons {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-body);
    font-size: 0.8rem;
    background: var(--color-white);
    border: 1px solid rgba(26, 24, 22, 0.15);
    color: var(--color-charcoal);
    cursor: pointer;
    transition: all 0.2s var(--ease-out);
}

.filter-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-btn.active {
    background: var(--color-ink);
    border-color: var(--color-ink);
    color: var(--color-parchment);
}

.sensor-link {
    color: var(--color-ink);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s var(--ease-out);
}

.sensor-link:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.sensor-type-label {
    color: var(--color-stone);
    font-size: 0.75rem;
}

.app-link {
    color: var(--color-charcoal);
    text-decoration: none;
    transition: color 0.2s var(--ease-out);
}

.app-link:hover {
    color: var(--color-accent);
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
    background: var(--color-ink);
    color: var(--color-parchment);
    margin-top: var(--space-2xl);
}

.footer-inner {
    max-width: var(--wide-width);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-parchment);
    margin-bottom: var(--space-sm);
    text-decoration: none;
}

.footer-logo:hover {
    color: var(--color-cream);
}

.footer-logo-icon {
    height: 22px;
    width: auto;
    filter: brightness(0) invert(0.85);
}

.footer-tagline {
    color: #a09a96;
    font-size: 0.95rem;
    margin: 0;
}

.footer-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-nav-title {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-parchment);
    margin-bottom: var(--space-sm);
}

.footer-nav a {
    color: #a09a96;
    font-size: 0.85rem;
    transition: color 0.3s var(--ease-out);
}

.footer-nav a:hover {
    color: var(--color-cream);
}

.footer-meta {
    text-align: right;
}

.footer-meta p {
    color: #8a8480;
    font-size: 0.8rem;
    margin: 0;
}

.footer-meta a {
    color: #a09a96;
}

.footer-meta a:hover {
    color: var(--color-cream);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
    .home-nav-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .product-specs {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .footer-meta {
        grid-column: 1 / -1;
        text-align: center;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }

    .header-inner {
        padding: var(--space-md);
    }

    .site-nav {
        position: fixed;
        top: 65px;
        left: 0;
        right: 0;
        background: var(--color-cream);
        border-bottom: 1px solid rgba(26, 24, 22, 0.08);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.4s var(--ease-out);
    }

    .site-nav.is-open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.is-active span:first-child {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.is-active span:last-child {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .home-nav-grid {
        grid-template-columns: 1fr;
        gap: 0;
        border-left: 1px solid rgba(26, 24, 22, 0.1);
        border-right: 1px solid rgba(26, 24, 22, 0.1);
    }

    .home-nav-card {
        border-bottom: 1px solid rgba(26, 24, 22, 0.1);
    }

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

    .pros-cons {
        grid-template-columns: 1fr;
    }

    .product-specs {
        grid-template-columns: repeat(2, 1fr);
    }

    .product-card-header {
        flex-direction: column;
    }

    .page-hero,
    .home-hero {
        padding: var(--space-lg) var(--space-md);
    }

    .content-section {
        padding: var(--space-xl) var(--space-md);
    }

    .article-content {
        padding: var(--space-xl) var(--space-md);
    }

    :root {
        --wide-width: 92vw;
        --full-width: 92vw;
    }
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card,
.product-card,
.home-nav-card {
    animation: fadeUp 0.7s var(--ease-out) both;
}

.card-grid > :nth-child(1) { animation-delay: 0.05s; }
.card-grid > :nth-child(2) { animation-delay: 0.1s; }
.card-grid > :nth-child(3) { animation-delay: 0.15s; }
.card-grid > :nth-child(4) { animation-delay: 0.2s; }
.card-grid > :nth-child(5) { animation-delay: 0.25s; }
.card-grid > :nth-child(6) { animation-delay: 0.3s; }

.home-nav-grid > :nth-child(1) { animation-delay: 0.1s; }
.home-nav-grid > :nth-child(2) { animation-delay: 0.2s; }
.home-nav-grid > :nth-child(3) { animation-delay: 0.3s; }

/* Alternating section backgrounds */
.content-section:nth-child(even) {
    background: var(--color-parchment);
}

/* ============================================
   Calculator Tools
   ============================================ */

.calculator-section {
    max-width: var(--wide-width);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.calc-card {
    background: var(--color-white);
    border: 1px solid rgba(26, 24, 22, 0.08);
    padding: var(--space-lg);
}

.calc-header {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(26, 24, 22, 0.06);
}

.calc-header h2 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 500;
    margin: 0 0 var(--space-xs) 0;
}

.calc-header p {
    font-size: 0.85rem;
    color: var(--color-stone);
    margin: 0;
}

.calc-form {
    margin-bottom: var(--space-lg);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-stone);
    margin-bottom: var(--space-xs);
}

.calc-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-body);
    font-size: 1rem;
    border: 1px solid rgba(26, 24, 22, 0.15);
    background: var(--color-cream);
    color: var(--color-ink);
    transition: all 0.3s var(--ease-out);
}

.calc-input:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-white);
}

.calc-button {
    width: 100%;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--color-ink);
    color: var(--color-parchment);
    border: none;
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
}

.calc-button:hover {
    background: var(--color-accent);
}

.calc-result {
    background: var(--color-parchment);
    padding: var(--space-lg);
    text-align: center;
}

.result-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-stone);
    margin-bottom: var(--space-sm);
}

.result-range {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.range-low, .range-high {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 400;
    color: var(--color-ink);
}

.range-sep {
    font-size: 0.85rem;
    color: var(--color-stone);
}

.range-unit {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-stone);
}

.result-note {
    font-size: 0.8rem;
    color: var(--color-stone);
    font-style: italic;
    line-height: 1.4;
}

/* Readiness Gauge */
.readiness-gauge {
    margin-bottom: var(--space-md);
}

.gauge-bar {
    position: relative;
    height: 8px;
    background: rgba(26, 24, 22, 0.1);
    border-radius: 4px;
    overflow: visible;
}

.gauge-fill {
    height: 100%;
    background: linear-gradient(90deg, #c4634f, #d4a03c, #7d9a6f, #5a8a4a);
    border-radius: 4px;
    transition: width 0.5s var(--ease-out), background 0.5s var(--ease-out);
    width: 50%;
}

.gauge-marker {
    position: absolute;
    top: -4px;
    width: 16px;
    height: 16px;
    background: var(--color-ink);
    border-radius: 50%;
    transform: translateX(-50%);
    transition: left 0.5s var(--ease-out);
    left: 50%;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.gauge-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.55rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-stone);
}

.readiness-score {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 400;
    color: var(--color-ink);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.readiness-advice {
    font-size: 0.85rem;
    color: var(--color-charcoal);
    line-height: 1.5;
}

/* Info Section */
.calc-info {
    background: var(--color-white);
    border: 1px solid rgba(26, 24, 22, 0.08);
    padding: var(--space-lg);
}

.calc-info h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    margin: 0 0 var(--space-xs) 0;
}

.calc-info-intro {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: 0 0 var(--space-md) 0;
}

.calc-info-intro a {
    color: var(--color-accent);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.info-item strong {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.info-item p {
    font-size: 0.8rem;
    color: var(--color-stone);
    margin: 0;
    line-height: 1.5;
}

@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }

    .readiness-score {
        font-size: 2.5rem;
    }
}

/* ============================================
   Science Pages
   ============================================ */

.science-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.filter-btn {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-stone);
    background: transparent;
    color: var(--color-stone);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.filter-btn:hover {
    border-color: var(--color-ink);
    color: var(--color-ink);
}

.filter-btn.active {
    background: var(--color-ink);
    border-color: var(--color-ink);
    color: var(--color-cream);
}

.science-controls {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.science-sort {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.science-sort label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-stone);
}

.sort-select {
    font-family: var(--font-body);
    font-size: 0.85rem;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-stone);
    border-radius: 4px;
    background: var(--color-white);
    cursor: pointer;
}

/* Study Cards */
.study-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.study-card {
    background: var(--color-white);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    padding: var(--space-xl);
    transition: box-shadow 0.2s ease;
}

.study-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.study-card-header {
    margin-bottom: var(--space-lg);
}

.study-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.study-source {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
}

.study-date {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--color-stone);
}

.study-badge {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 8px;
    border-radius: 3px;
}

.study-badge.new {
    background: var(--color-accent-glow);
    color: var(--color-accent);
}

.study-badge.works {
    background: rgba(125, 154, 111, 0.15);
    color: var(--color-sage);
}

.study-badge.mixed {
    background: rgba(212, 160, 60, 0.15);
    color: var(--color-warning);
}

.study-badge.doesnt-work {
    background: rgba(196, 99, 79, 0.15);
    color: var(--color-accent);
}

.study-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 500;
    line-height: 1.3;
    color: var(--color-ink);
    margin: 0;
}

.study-summary {
    color: var(--color-charcoal);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.study-summary p {
    margin: 0;
}

.study-topics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.topic-pill {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 4px 10px;
    background: var(--color-parchment);
    color: var(--color-stone);
    border-radius: 3px;
    text-decoration: none;
    transition: all 0.15s ease;
}

.topic-pill:hover {
    background: var(--color-ink);
    color: var(--color-cream);
}

.topic-pill.current {
    background: var(--color-ink);
    color: var(--color-cream);
}

.topic-pill.large {
    font-size: 0.7rem;
    padding: 6px 14px;
}

.topic-pills-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
}

.study-expand-btn {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.study-expand-btn:hover {
    color: var(--color-accent-light);
}

.study-expand-btn .collapse-text {
    display: none;
}

.study-expand-btn[aria-expanded="true"] .expand-text {
    display: none;
}

.study-expand-btn[aria-expanded="true"] .collapse-text {
    display: inline;
}

.study-details {
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-parchment);
}

.study-detail-section {
    margin-bottom: var(--space-lg);
}

.study-detail-section h4 {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-stone);
    margin: 0 0 var(--space-sm) 0;
}

.study-detail-section p {
    font-size: 0.85rem;
    color: var(--color-charcoal);
    margin: 0;
    line-height: 1.6;
}

.study-detail-section ul {
    margin: 0;
    padding-left: var(--space-lg);
}

.study-detail-section li {
    font-size: 0.85rem;
    color: var(--color-charcoal);
    margin-bottom: var(--space-xs);
    line-height: 1.5;
}

.study-takeaway {
    background: var(--color-sage);
    background: linear-gradient(135deg, rgba(125, 154, 111, 0.1), rgba(125, 154, 111, 0.05));
    border-left: 3px solid var(--color-sage);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
    border-radius: 0 4px 4px 0;
}

.study-takeaway h4 {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-sage);
    margin: 0 0 var(--space-sm) 0;
}

.study-takeaway p {
    font-size: 0.85rem;
    color: var(--color-charcoal);
    margin: 0;
    line-height: 1.6;
}

.study-source-link {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    text-decoration: none;
}

.study-source-link:hover {
    text-decoration: underline;
}

/* Topic Card (in hub) */
.topic-card {
    display: block;
    text-decoration: none;
}

.topic-card .card-title {
    color: var(--color-ink);
}

.topic-card:hover .card-title {
    color: var(--color-accent);
}

/* Science About */
.science-about {
    max-width: 40rem;
    margin: 0 auto;
    text-align: center;
}

.science-about h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

.science-about p {
    font-size: 0.9rem;
    color: var(--color-stone);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

/* Breadcrumb */
.breadcrumb {
    margin-bottom: var(--space-lg);
}

.breadcrumb a {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-stone);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--space-3xl);
    color: var(--color-stone);
}

@media (max-width: 768px) {
    .science-controls {
        flex-direction: column;
    }

    .study-card {
        padding: var(--space-lg);
    }

    .study-title {
        font-size: 1rem;
    }
}