/* AI Healthcare Now - Main Stylesheet */

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

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

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    padding-top: var(--header-height);
}

a { color: var(--color-blue); text-decoration: none; }
a:hover { color: var(--color-blue-light); }

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

/* ── Typography ──────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 300;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: var(--color-navy);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.3rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.1rem; font-weight: 400; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.25rem; }

/* ── Screen reader only ──────────────────────────────────────────────────── */
.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── Container ───────────────────────────────────────────────────────────── */
.container {
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

/* ── Header / Nav ────────────────────────────────────────────────────────── */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-height);
    background: var(--color-bg-navy);
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.site-header__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.site-logo a {
    display: flex;
    align-items: baseline;
    gap: 0;
    text-decoration: none;
}

.site-logo__primary {
    font-family: var(--font-heading);
    font-weight: 200;
    font-size: 1.125rem;
    letter-spacing: -0.03em;
    color: #ffffff;
}

.site-logo__dot {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-teal-light);
    margin-left: 0.2em;
}

.site-nav { margin-left: auto; }

.site-nav__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0;
}

.site-nav__item { }

.site-nav__list a {
    display: block;
    padding: 0.4rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    transition: color 0.15s;
}

.site-nav__list a:hover,
.site-nav__list a.is-active {
    color: #ffffff;
}

/* Hamburger */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: auto;
}

.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: rgba(255,255,255,0.8);
    transition: background 0.2s;
}

/* ── Page wrapper ────────────────────────────────────────────────────────── */
.page-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

.content-main { }

/* ── Breadcrumbs ─────────────────────────────────────────────────────────── */
.breadcrumbs { margin-bottom: 1.5rem; }

.breadcrumbs__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.breadcrumbs__item + .breadcrumbs__item::before {
    content: '/';
    margin: 0 0.5rem;
    color: var(--color-border);
}

.breadcrumbs__item a { color: var(--color-text-muted); }
.breadcrumbs__item a:hover { color: var(--color-blue); }
.breadcrumbs__item.is-current span { color: var(--color-text-muted); }

/* ── Section headings ────────────────────────────────────────────────────── */
.section-heading {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 300;
    margin-bottom: 1.5rem;
    color: var(--color-navy);
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    border-radius: var(--radius-btn);
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    white-space: nowrap;
}

.btn--primary {
    background: var(--color-blue);
    color: #ffffff;
    border-color: var(--color-blue);
}

.btn--primary:hover {
    background: var(--color-blue-light);
    border-color: var(--color-blue-light);
    color: #ffffff;
}

.btn--ghost {
    background: transparent;
    color: rgba(255,255,255,0.9);
    border-color: rgba(255,255,255,0.3);
}

.btn--ghost:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.6);
    color: #ffffff;
}

.btn--outline {
    background: transparent;
    color: var(--color-blue);
    border-color: var(--color-blue);
}

.btn--outline:hover {
    background: var(--color-blue);
    color: #ffffff;
}

/* ── Hero ────────────────────────────────────────────────────────────────── */
.hero {
    background: var(--color-bg-navy);
    color: #ffffff;
    padding: 5rem 1.5rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 3rem;
    align-items: center;
}

.hero__headline {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 200;
    letter-spacing: -0.04em;
    color: #ffffff;
    margin-bottom: 0.5rem;
}

.hero__subheadline {
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 300;
    color: var(--color-teal-light);
    letter-spacing: 0;
    margin-bottom: 1.5rem;
}

.hero__intro {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.78);
    max-width: 580px;
    margin-bottom: 2rem;
}

.hero__ctas { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Signal decoration */
.hero__signal {
    position: relative;
    width: 160px;
    height: 160px;
    flex-shrink: 0;
}

.signal-ring {
    position: absolute;
    border: 1px solid rgba(0,121,107,0.25);
    border-radius: 50%;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
}

.signal-ring--1 { width: 160px; height: 160px; }
.signal-ring--2 { width: 110px; height: 110px; border-color: rgba(0,121,107,0.4); }
.signal-ring--3 { width: 64px;  height: 64px;  border-color: rgba(0,121,107,0.6); }

.signal-dot {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 12px; height: 12px;
    background: var(--color-teal-light);
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(0,137,123,0.6);
}

/* ── Intro section ───────────────────────────────────────────────────────── */
.intro-section {
    padding: 3rem 1.5rem;
    background: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border-light);
}

.intro-section .container { max-width: 720px; }

.intro-section__headline {
    font-size: clamp(1.3rem, 2.5vw, 1.75rem);
    margin-bottom: 1rem;
}

.intro-section__body {
    font-size: 1.0625rem;
    line-height: 1.75;
    color: var(--color-text-muted);
}

/* ── Topic cards ─────────────────────────────────────────────────────────── */
.topics-section {
    padding: 4rem 1.5rem;
    background: var(--color-bg);
}

.topics-section .container { }

.topic-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
    margin-top: 0;
}

.topic-card {
    display: flex;
    flex-direction: column;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}

.topic-card:hover {
    border-color: var(--color-blue);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.topic-card__title {
    font-size: 1.05rem;
    font-weight: 400;
    color: var(--color-navy);
    margin-bottom: 0.75rem;
}

.topic-card__desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 1rem;
}

.topic-card__link {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-blue);
    letter-spacing: 0.01em;
}

/* ── Article cards ───────────────────────────────────────────────────────── */
.featured-articles {
    padding: 4rem 1.5rem;
    background: var(--color-bg-white);
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.article-grid--compact { margin-bottom: 0; }

.article-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.article-card__meta {
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-bottom: 0.75rem;
}

.article-card__title {
    font-size: 1.05rem;
    font-weight: 400;
    margin-bottom: 0.75rem;
    line-height: 1.35;
}

.article-card__title a {
    color: var(--color-navy);
    text-decoration: none;
}

.article-card__title a:hover { color: var(--color-blue); }

.article-card__excerpt {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 1rem;
}

.article-card__readmore {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-blue);
    text-decoration: none;
    margin-top: auto;
}

.view-all-wrap { text-align: center; margin-top: 1rem; }

/* ── Newsletter ──────────────────────────────────────────────────────────── */
.newsletter-section {
    padding: 4rem 1.5rem;
    background: var(--color-accent-blue-pale);
}

.newsletter-block {
    background: var(--color-navy);
    border-radius: var(--radius-card);
    padding: 2.5rem;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: center;
}

.newsletter-block--inline {
    grid-template-columns: 1fr;
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
}

.newsletter-block--inline .newsletter-block__headline { color: var(--color-navy); }
.newsletter-block--inline .newsletter-block__body { color: var(--color-text-muted); }

.newsletter-block__headline {
    font-size: clamp(1.2rem, 2.5vw, 1.75rem);
    font-weight: 300;
    color: #ffffff;
    margin-bottom: 0.5rem;
}

.newsletter-block__body {
    font-size: 0.9375rem;
    color: rgba(255,255,255,0.7);
}

.newsletter-block__success {
    font-size: 0.9375rem;
    color: var(--color-teal-light);
    padding: 1rem 0;
}

.newsletter-form__row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.newsletter-form__input {
    flex: 1;
    min-width: 200px;
    padding: 0.6rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-btn);
    font-size: 0.875rem;
    background: var(--color-bg-white);
    color: var(--color-text);
}

.newsletter-form__input:focus {
    outline: 2px solid var(--color-blue);
    outline-offset: 1px;
}

/* ── Portfolio section ───────────────────────────────────────────────────── */
.portfolio-section {
    padding: 4rem 1.5rem;
    background: var(--color-bg);
}

.portfolio-intro {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    max-width: 640px;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.portfolio-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 1rem 1.25rem;
}

.portfolio-card__name {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-blue);
    text-decoration: none;
    display: block;
    margin-bottom: 0.25rem;
}

.portfolio-card__name:hover { color: var(--color-navy); }

.portfolio-card__desc {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* ── Page content ────────────────────────────────────────────────────────── */
.page-header {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border-light);
}

.page-header__title {
    font-size: clamp(1.5rem, 3.5vw, 2.25rem);
    margin-bottom: 0.75rem;
}

.page-header__intro {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    max-width: 680px;
    margin: 0;
}

.page-body { max-width: 700px; }

.prose h2 { margin-top: 2rem; margin-bottom: 0.75rem; }
.prose h3 { margin-top: 1.5rem; margin-bottom: 0.5rem; }
.prose p  { margin-bottom: 1rem; }
.prose ul, .prose ol { margin-bottom: 1rem; }
.prose li { margin-bottom: 0.35rem; }

.callout {
    background: var(--color-accent-blue-pale);
    border-left: 3px solid var(--color-blue);
    padding: 1rem 1.25rem;
    border-radius: 0 var(--radius-card) var(--radius-card) 0;
    margin: 1.5rem 0;
    font-size: 0.9375rem;
    color: var(--color-text);
}

/* ── Article page ────────────────────────────────────────────────────────── */
.article-page { max-width: 780px; }

.article-header { margin-bottom: 2rem; }

.article-header__meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.article-meta__category {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-teal);
    text-decoration: none;
}

.article-meta__category:hover { color: var(--color-teal-light); }
.article-meta__date { color: var(--color-text-light); }
.article-meta__updated { color: var(--color-text-light); font-style: italic; }

.article-header__title {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    margin-bottom: 1rem;
}

.article-header__excerpt {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.article-body { margin-bottom: 2.5rem; }

.article-faq {
    background: var(--color-bg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-card);
    padding: 1.5rem 2rem;
    margin-bottom: 2rem;
}

.article-faq__heading {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.article-footer { margin-bottom: 2rem; }

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-accent-blue-pale);
    color: var(--color-blue);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
    text-decoration: none;
    letter-spacing: 0.02em;
}

.related-articles {
    border-top: 1px solid var(--color-border-light);
    padding-top: 2.5rem;
    margin-bottom: 2.5rem;
}

.related-articles__inner { }
.related-articles__heading { font-size: 1.25rem; margin-bottom: 1.25rem; }

.article-newsletter {
    border-top: 1px solid var(--color-border-light);
    padding-top: 2rem;
}

/* ── FAQ page ────────────────────────────────────────────────────────────── */
.faq-page { }
.faq-groups { }
.faq-group { margin-bottom: 2.5rem; }
.faq-group__heading {
    font-size: 1.2rem;
    color: var(--color-blue);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border-light);
}

.faq-list { }

.faq-list__item {
    border-bottom: 1px solid var(--color-border-light);
    padding: 1.25rem 0;
}

.faq-list__item:last-child { border-bottom: none; }

.faq-list__q {
    font-weight: 500;
    font-size: 1.0625rem;
    color: var(--color-navy);
    margin-bottom: 0.5rem;
    font-family: var(--font-heading);
    letter-spacing: -0.01em;
}

.faq-list__a {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 700px;
}

.faq-cta {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border-light);
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* ── Category page ───────────────────────────────────────────────────────── */
.category-page { }
.category-header { margin-bottom: 2.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--color-border-light); }
.category-header__title { margin-bottom: 0.75rem; }
.category-header__desc { font-size: 1.0625rem; color: var(--color-text-muted); max-width: 680px; }

.related-categories {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border-light);
}

.related-categories__heading { font-size: 1rem; font-weight: 500; margin-bottom: 0.75rem; }

.related-categories__list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.related-categories__list a {
    padding: 0.3rem 0.75rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
}

.related-categories__list a:hover {
    background: var(--color-blue);
    color: #ffffff;
    border-color: var(--color-blue);
}

/* ── Library page ────────────────────────────────────────────────────────── */
.library-page { }
.library-topics { margin-bottom: 3rem; }
.library-recent { }

/* ── Glossary ────────────────────────────────────────────────────────────── */
.glossary-page { }

.glossary-alpha {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-card);
}

.glossary-alpha__link {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    line-height: 2rem;
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-blue);
    border-radius: var(--radius-btn);
    text-decoration: none;
}

.glossary-alpha__link:hover { background: var(--color-blue); color: #ffffff; }

.glossary-letter { margin-bottom: 2.5rem; }

.glossary-letter__heading {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--color-navy);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border-light);
}

.glossary-list__entry {
    border-bottom: 1px solid var(--color-border-light);
    padding: 1rem 0;
}

.glossary-list__term {
    font-weight: 500;
    font-size: 1rem;
    margin-bottom: 0.3rem;
}

.glossary-list__term a { color: var(--color-navy); }
.glossary-list__term a:hover { color: var(--color-blue); }

.glossary-list__def {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Glossary term page */
.glossary-term-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border-light);
}

.back-link {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    text-decoration: none;
    display: inline-block;
    margin-bottom: 1rem;
}

.back-link:hover { color: var(--color-blue); }

.glossary-term-header__title { margin-bottom: 0.5rem; }

.glossary-term-header__aliases {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    font-style: italic;
}

.glossary-term-short-def {
    font-size: 1.0625rem;
    color: var(--color-text);
    border-left: 3px solid var(--color-teal);
    padding-left: 1rem;
    margin-bottom: 1.5rem;
}

.glossary-term-full-def { margin-bottom: 2rem; }

.glossary-related-terms {
    background: var(--color-bg);
    border-radius: var(--radius-card);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
}

.glossary-related-terms__heading { font-size: 0.9rem; font-weight: 500; margin-bottom: 0.75rem; }

.glossary-related-terms__list {
    list-style: none;
    padding: 0;
}

.glossary-related-terms__list li { margin-bottom: 0.5rem; }
.glossary-related-terms__list a { color: var(--color-blue); }
.glossary-related-terms__def { font-size: 0.8125rem; color: var(--color-text-muted); }

.glossary-term-footer { margin-top: 1.5rem; }

/* ── Contact page ────────────────────────────────────────────────────────── */
.contact-page { max-width: 640px; }

.contact-form { margin-bottom: 2rem; }

.form-field { margin-bottom: 1.25rem; }

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-navy);
    margin-bottom: 0.4rem;
}

.form-input {
    width: 100%;
    padding: 0.6rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-btn);
    font-size: 0.9375rem;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-bg-white);
    transition: border-color 0.15s;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-blue);
    box-shadow: 0 0 0 3px rgba(21,101,192,0.1);
}

.form-textarea { resize: vertical; min-height: 140px; }

.has-error .form-input { border-color: #d32f2f; }

.form-error {
    display: block;
    font-size: 0.8125rem;
    color: #d32f2f;
    margin-top: 0.25rem;
}

.form-actions { margin-top: 1.5rem; }

.form-status {
    padding: 0.875rem 1rem;
    border-radius: var(--radius-card);
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
}

.form-status--success { background: #e8f5e9; color: #1b5e20; border: 1px solid #a5d6a7; }
.form-status--error   { background: #ffebee; color: #b71c1c; border: 1px solid #ef9a9a; }

.contact-uses { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--color-border-light); }
.contact-uses h2 { font-size: 1rem; font-weight: 500; margin-bottom: 0.75rem; }
.contact-uses ul { padding-left: 1.25rem; }

/* ── Error page ──────────────────────────────────────────────────────────── */
.error-page {
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.error-page__inner {
    max-width: 600px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
    text-align: center;
}

.error-page__code {
    font-size: 6rem;
    font-weight: 200;
    line-height: 1;
    color: var(--color-border);
    margin-bottom: 1rem;
}

.error-page__title { font-size: 1.75rem; margin-bottom: 0.75rem; }

.error-page__message { color: var(--color-text-muted); margin-bottom: 2rem; }

.error-page__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2.5rem; }

.error-page__search-tips { text-align: left; font-size: 0.9rem; }
.error-page__search-tips p { color: var(--color-text-muted); margin-bottom: 0.5rem; }
.error-page__search-tips ul { list-style: disc; padding-left: 1.5rem; }
.error-page__search-tips li { margin-bottom: 0.3rem; }

/* ── Empty state ─────────────────────────────────────────────────────────── */
.empty-state {
    padding: 2rem;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    background: var(--color-bg);
    border-radius: var(--radius-card);
    border: 1px solid var(--color-border-light);
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.site-footer {
    background: var(--color-navy);
    color: rgba(255,255,255,0.65);
    margin-top: 4rem;
}

.site-footer__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem 1.5rem 1.5rem;
}

.site-footer__top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.site-footer__brand {
    font-family: var(--font-heading);
    font-weight: 200;
    font-size: 1.25rem;
    letter-spacing: -0.03em;
    color: #ffffff;
    margin-bottom: 0.5rem;
}

.site-footer__tagline {
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    color: rgba(255,255,255,0.5);
}

.site-footer__byline {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.35);
    font-style: italic;
}

.site-footer__col-heading {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.4);
    margin-bottom: 0.875rem;
}

.site-footer__links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-footer__links li { margin-bottom: 0.5rem; font-size: 0.8125rem; }

.site-footer__links a {
    color: rgba(255,255,255,0.55);
    text-decoration: none;
    transition: color 0.15s;
}

.site-footer__links a:hover { color: rgba(255,255,255,0.9); }

.site-footer__bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: rgba(255,255,255,0.3);
}

.page-view-counter { font-size: 0.75rem; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
    .site-footer__top { grid-template-columns: 1fr 1fr; }
    .hero__inner { grid-template-columns: 1fr; }
    .hero__signal { display: none; }
    .newsletter-block { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav-hamburger { display: flex; }

    .site-nav {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0; right: 0;
        background: var(--color-navy);
        border-top: 1px solid rgba(255,255,255,0.08);
        padding: 1rem 0 1.5rem;
        z-index: 999;
    }

    .site-nav.is-open { display: block; }

    .site-nav__list { flex-direction: column; gap: 0; }

    .site-nav__list a {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
        text-transform: none;
        letter-spacing: 0;
    }

    .topic-cards { grid-template-columns: 1fr 1fr; }
    .article-grid { grid-template-columns: 1fr; }
    .portfolio-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .topic-cards, .portfolio-grid { grid-template-columns: 1fr; }
    .hero { padding: 3rem 1rem 2.5rem; }
    .hero__ctas { flex-direction: column; }
    .newsletter-form__row { flex-direction: column; }
    .site-footer__top { grid-template-columns: 1fr; }
}