/* ============================================================
   Revive ERM — Shared Stylesheet
   Mobile-first architecture. Base styles target 375px.
   Scale up via min-width breakpoints: 480px, 768px, 900px, 1024px, 1200px.
   Edit here; all pages update.
   ============================================================ */

/* ── Custom Properties ─────────────────────────────────────── */

:root {
    --color-ink:    #1a1a1a;
    --color-paper:  #faf9f7;
    --color-accent: #0656d6;
    --color-muted:  #6b6b6b;
    --color-rule:   #d4d0c8;
    --color-surface:#f4f3f1;

    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body:    'Source Sans 3', system-ui, sans-serif;

    /* Spacing scale */
    --space-xs:  0.5rem;
    --space-sm:  1rem;
    --space-md:  1.5rem;
    --space-lg:  2.5rem;
    --space-xl:  4rem;
    --space-2xl: 6rem;

    /* Nav height — used for page padding-top */
    --nav-height: 60px;
}

/* ── Reset ─────────────────────────────────────────────────── */

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

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

/* ── Base (375px mobile) ───────────────────────────────────── */

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-ink);
    background: var(--color-paper);
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: inherit;
}

/* ── Navigation ────────────────────────────────────────────── */

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-paper);
    border-bottom: 1px solid var(--color-rule);
    padding: 0 var(--space-sm);
    height: var(--nav-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: box-shadow 0.3s ease;
}

nav.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.nav-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
    z-index: 2;
}

/* Mobile: 40px logo keeps nav bar clean at 60px height */
.nav-logo {
    height: 40px;
    width: auto;
}

/* Mobile: hamburger visible, links hidden */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    /* 44×44px touch target */
    width: 44px;
    height: 44px;
    padding: 10px;
    z-index: 2;
    background: none;
    border: none;
    flex-shrink: 0;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-ink);
    transition: all 0.3s ease;
    border-radius: 1px;
}

/* Mobile nav: full-width dropdown below bar */
.nav-links {
    display: none;
    list-style: none;
}

.nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-paper);
    border-bottom: 2px solid var(--color-accent);
    padding: var(--space-sm) 0;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    animation: navSlideDown 0.2s ease;
}

@keyframes navSlideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.nav-links li {
    border-bottom: 1px solid var(--color-rule);
}

.nav-links li:last-child {
    border-bottom: none;
}

.nav-links a {
    display: block;
    padding: 0.875rem var(--space-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-muted);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    /* 44px min touch target */
    min-height: 44px;
    display: flex;
    align-items: center;
    transition: color 0.2s ease, background 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-accent);
    background: rgba(6, 86, 214, 0.04);
}

/* ── Section utilities ─────────────────────────────────────── */

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

.section-eyebrow {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 5vw, 3rem);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

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

/* ── Page padding (accounts for fixed nav) ─────────────────── */

.article-header {
    padding: calc(var(--nav-height) + 2.5rem) var(--space-sm) 2rem;
    max-width: 800px;
    margin: 0 auto;
}

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

.article-category {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
}

.article-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 500;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.article-subtitle {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--color-muted);
    line-height: 1.6;
}

/* ── Article content ───────────────────────────────────────── */

.article-content {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 var(--space-sm) var(--space-2xl);
}

.article-content h2 {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 1.75rem);
    font-weight: 500;
    margin: 2.5rem 0 var(--space-md);
    line-height: 1.3;
}

.article-content h3 {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 3vw, 1.35rem);
    font-weight: 500;
    margin: 2rem 0 var(--space-sm);
    line-height: 1.3;
}

.article-content p {
    margin-bottom: var(--space-md);
    font-weight: 300;
    font-size: 1rem;
    line-height: 1.75;
}

.article-content p strong {
    font-weight: 500;
    color: var(--color-ink);
}

/* Callout blocks */
.callout {
    background: var(--color-accent);
    color: var(--color-paper);
    padding: var(--space-md) var(--space-sm);
    margin: 2rem calc(-1 * var(--space-sm));
    font-weight: 500;
    font-size: 1.05rem;
    line-height: 1.5;
}

.callout-question {
    background: var(--color-surface);
    color: var(--color-ink);
    padding: var(--space-md);
    margin: 2rem 0;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-style: italic;
    font-weight: 400;
    line-height: 1.5;
    border-left: 4px solid var(--color-accent);
}

/* TLDR block */
.tldr {
    background: var(--color-surface);
    border-left: 4px solid var(--color-accent);
    padding: var(--space-md);
    margin: 0 0 2rem;
}

.tldr-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.tldr p {
    font-size: 0.95rem;
    font-weight: 400;
    margin-bottom: 0;
    line-height: 1.65;
}

/* Article CTA */
.article-cta {
    background: var(--color-surface);
    padding: 2rem var(--space-sm);
    margin: 2rem calc(-1 * var(--space-sm)) 0;
    text-align: center;
}

.article-cta h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
    /* Override article-content h3 margins */
    margin-top: 0;
}

.article-cta p {
    font-weight: 300;
    color: var(--color-muted);
    margin-bottom: var(--space-md);
}

/* ── CTA Button ────────────────────────────────────────────── */

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-paper);
    background: var(--color-ink);
    text-decoration: none;
    padding: 0.875rem 1.75rem;
    min-height: 44px;
    transition: background 0.3s ease;
}

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

/* ── About Page ────────────────────────────────────────────── */

.about-section {
    padding: calc(var(--nav-height) + 2.5rem) var(--space-sm) var(--space-xl);
    max-width: 1100px;
    margin: 0 auto;
}

/* Mobile: stacked */
.about-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.about-image {
    position: relative;
    max-width: 280px;
}

.about-image img {
    width: 100%;
    aspect-ratio: 4/5;
    object-fit: cover;
    filter: grayscale(20%);
}

.about-image::after {
    content: '';
    position: absolute;
    inset: 0.75rem -0.75rem -0.75rem 0.75rem;
    border: 1px solid var(--color-accent);
    z-index: -1;
}

.about-text h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 500;
    margin-bottom: var(--space-md);
    line-height: 1.2;
}

.about-text p {
    font-size: 1rem;
    font-weight: 300;
    color: var(--color-muted);
    margin-bottom: var(--space-md);
    line-height: 1.75;
}

.about-text p strong {
    color: var(--color-ink);
    font-weight: 500;
}

.about-credentials {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-rule);
}

.about-credentials h2 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

/* Mobile: single column */
.about-credentials ul {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

.about-credentials li {
    font-size: 0.95rem;
    color: var(--color-muted);
    padding-left: var(--space-sm);
    position: relative;
    line-height: 1.5;
}

.about-credentials li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-rule);
}

/* ── Contact Section ───────────────────────────────────────── */

.contact {
    background: var(--color-ink);
    color: var(--color-paper);
    text-align: center;
    padding: var(--space-xl) var(--space-sm);
}

.contact .section-eyebrow {
    color: rgba(255, 255, 255, 0.5);
}

.contact .section-title {
    color: var(--color-paper);
    margin-bottom: var(--space-sm);
}

.contact-subtitle {
    font-size: 1rem;
    font-weight: 300;
    opacity: 0.7;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.contact-method {
    text-align: center;
}

.contact-method-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    opacity: 0.5;
    margin-bottom: 0.5rem;
}

.contact-method a {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--color-paper);
    text-decoration: none;
    /* Tap target */
    display: inline-block;
    padding: 0.25rem 0;
    min-height: 44px;
    line-height: 44px;
    transition: opacity 0.2s ease;
}

.contact-method a:hover {
    opacity: 0.7;
}

/* ── Insights Page ─────────────────────────────────────────── */

.page-header {
    padding: calc(var(--nav-height) + 2.5rem) var(--space-sm) 2rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 500;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
}

.page-subtitle {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--color-muted);
    line-height: 1.6;
}

.insights-list {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-sm) var(--space-2xl);
}

.cluster-header {
    padding: 2.5rem 0 0;
    border-top: 2px solid var(--color-ink);
    margin-top: var(--space-sm);
}

.cluster-header:first-child {
    border-top: none;
    margin-top: 0;
    padding-top: 0;
}

.cluster-label {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-ink);
}

.insight-item {
    display: block;
    padding: 2rem 0;
    border-bottom: 1px solid var(--color-rule);
    text-decoration: none;
    color: inherit;
    transition: padding-left 0.3s ease;
}

.insight-item:first-of-type {
    border-top: 1px solid var(--color-rule);
}

.insight-category {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.insight-title {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 4vw, 1.75rem);
    font-weight: 500;
    line-height: 1.3;
    margin-bottom: 0.75rem;
    transition: color 0.2s ease;
}

.insight-excerpt {
    font-size: 0.95rem;
    font-weight: 300;
    color: var(--color-muted);
    line-height: 1.7;
}

/* ── Hero Animations (index only) ──────────────────────────── */

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

/* ── Footer ────────────────────────────────────────────────── */

footer {
    background: var(--color-ink);
    color: var(--color-paper);
    padding: 1.5rem var(--space-sm);
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-text {
    font-size: 0.82rem;
    opacity: 0.5;
    line-height: 1.6;
}

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

/* ── 480px breakpoint ──────────────────────────────────────── */

@media (min-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }

    .article-header {
        padding: calc(var(--nav-height) + 3rem) var(--space-md) 2.5rem;
    }

    .article-content {
        padding: 0 var(--space-md) var(--space-2xl);
    }

    .callout {
        padding: var(--space-md) var(--space-md);
        margin: 2rem calc(-1 * var(--space-md));
    }

    .article-cta {
        padding: 2.5rem var(--space-md);
        margin: 2rem calc(-1 * var(--space-md)) 0;
    }

    .about-section {
        padding: calc(var(--nav-height) + 3rem) var(--space-md) var(--space-xl);
    }

    .about-image {
        max-width: 320px;
    }

    .page-header {
        padding: calc(var(--nav-height) + 3rem) var(--space-md) 2.5rem;
    }

    .insights-list {
        padding: 0 var(--space-md) var(--space-2xl);
    }
}

/* ── 768px breakpoint ──────────────────────────────────────── */

@media (min-width: 768px) {
    body {
        font-size: 17px;
    }

    .article-header {
        padding: calc(var(--nav-height) + 4rem) 2rem 3rem;
    }

    .article-content {
        padding: 0 2rem var(--space-2xl);
    }

    .article-subtitle {
        font-size: 1.25rem;
    }

    .callout {
        padding: 1.5rem 2rem;
        margin: 2.5rem -2rem;
        font-size: 1.1rem;
    }

    .callout-question {
        font-size: 1.25rem;
        padding: 2rem;
    }

    .article-cta {
        padding: 3rem;
        margin: 3rem -2rem 0;
    }

    .article-cta h3 {
        font-size: 1.5rem;
    }

    .about-section {
        padding: calc(var(--nav-height) + 5rem) 2rem var(--space-2xl);
    }

    .contact {
        padding: var(--space-2xl) 2rem;
    }

    .contact-methods {
        flex-direction: row;
        justify-content: center;
        gap: var(--space-xl);
    }

    .contact-subtitle {
        font-size: 1.1rem;
        margin-bottom: 3rem;
    }

    .contact-method a {
        font-size: 1.25rem;
    }

    .page-header {
        padding: calc(var(--nav-height) + 5rem) 2rem 3rem;
    }

    .insights-list {
        padding: 0 2rem var(--space-2xl);
    }

    .insight-item {
        padding: 2.5rem 0;
    }

    .insight-item:hover {
        padding-left: var(--space-sm);
    }

    .insight-item:hover .insight-title {
        color: var(--color-accent);
    }

    .about-credentials ul {
        grid-template-columns: 1fr 1fr;
    }
}

/* ── 900px breakpoint — desktop nav replaces hamburger ─────── */

@media (min-width: 900px) {
    :root {
        --nav-height: 72px;
    }

    nav {
        padding: 0 2rem;
    }

    .nav-logo {
        height: 60px;
    }

    /* Hide hamburger, show links */
    .nav-toggle {
        display: none;
    }

    .nav-links {
        display: flex;
        flex-direction: row;
        gap: 2.5rem;
        position: static;
        background: none;
        border: none;
        padding: 0;
        box-shadow: none;
        animation: none;
    }

    /* Override mobile active state */
    .nav-links.active {
        display: flex;
        flex-direction: row;
        position: static;
        border: none;
        box-shadow: none;
        padding: 0;
        animation: none;
    }

    .nav-links li {
        border-bottom: none;
    }

    .nav-links a {
        display: block;
        padding: 0;
        min-height: auto;
        font-size: 0.9rem;
        background: none;
    }

    .nav-links a:hover,
    .nav-links a.active {
        background: none;
        color: var(--color-accent);
    }
}

/* ── 1024px breakpoint ─────────────────────────────────────── */

@media (min-width: 1024px) {
    .about-content {
        display: grid;
        grid-template-columns: 350px 1fr;
        gap: 5rem;
        align-items: start;
    }

    .about-image {
        max-width: none;
    }

    .about-image::after {
        inset: 1rem -1rem -1rem 1rem;
    }
}

/* ── 1200px breakpoint ─────────────────────────────────────── */

@media (min-width: 1200px) {
    .container {
        padding: 0 2rem;
    }
}