/* ==========================================
   CSS VARIABLES
   ========================================== */

:root {
    /* Colors - Refined neutral palette with warm accent */
    --color-bg: #FAFAF9;
    --color-bg-alt: #FFFFFF;
    --color-bg-accent: #F5F5F4;
    --color-text: #1C1917;
    --color-text-secondary: #57534E;
    --color-text-muted: #A8A29E;
    --color-accent: #B45309;
    --color-accent-hover: #92400E;
    --color-accent-light: #FEF3C7;
    --color-border: #E7E5E4;
    --color-border-light: #F5F5F4;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    
    /* Sizing */
    --container-max: 1200px;
    --container-narrow: 720px;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;

    /* Effects */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ==========================================
   RESET & BASE
   ========================================== */

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

html {
    font-size: 17px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

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

/* ==========================================
   TYPOGRAPHY
   ========================================== */

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.125rem; }

p {
    color: var(--color-text-secondary);
}

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

/* ==========================================
   LAYOUT
   ========================================== */

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

section {
    padding: var(--space-3xl) 0;
}

/* ==========================================
   COMPONENTS: NAVIGATION
   ========================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(250, 250, 249, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
}

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

.nav-logo {
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: -0.01em;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.nav-logo:hover {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--color-text);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 20px;
    height: 1.5px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

/* ==========================================
   COMPONENTS: BUTTONS
   ========================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--color-text);
    color: var(--color-bg);
}

.btn-primary:hover {
    background: var(--color-accent);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover {
    border-color: var(--color-text);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 500;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.text-link svg {
    transition: transform var(--transition-fast);
}

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

.text-link:hover svg {
    transform: translateX(4px);
}

/* ==========================================
   COMPONENTS: SECTION LABELS
   ========================================== */

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.section-title {
    max-width: 640px;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

/* ==========================================
   HERO SECTION
   ========================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

.hero-content {
    max-width: 720px;
}

.hero-title {
    font-family: var(--font-serif);
    font-weight: 500;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.hero-title-accent {
    color: var(--color-accent);
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    max-width: 560px;
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ==========================================
   VALUE SECTION
   ========================================== */

.value-section {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border-light);
    border-bottom: 1px solid var(--color-border-light);
}

.value-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--space-xl);
}

.value-header .section-title {
    margin-left: auto;
    margin-right: auto;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.value-card {
    padding: var(--space-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base);
}

.value-card:hover {
    border-color: var(--color-text-muted);
}

.value-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-accent);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.value-card h3 {
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.value-card p {
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==========================================
   APPROACH SECTION
   ========================================== */

.approach-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.approach-text {
    font-size: 1.1rem;
    line-height: 1.75;
    margin-bottom: var(--space-md);
}

.approach-text:last-of-type {
    margin-bottom: var(--space-lg);
}

.approach-visual {
    display: flex;
    justify-content: center;
}

.approach-diagram {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.diagram-item {
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
}

.diagram-label {
    display: block;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.diagram-source {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.diagram-connector {
    width: 1px;
    height: 24px;
    background: var(--color-border);
    margin: 0 auto;
}

/* ==========================================
   SERVICES SECTION
   ========================================== */

.services-section {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border-light);
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.service-item {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    transition: background var(--transition-base);
}

.service-item:hover {
    background: var(--color-bg);
}

.service-number {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    display: block;
    margin-bottom: var(--space-sm);
}

.service-item h3 {
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.service-item p {
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==========================================
   CTA SECTION
   ========================================== */

.cta-section {
    border-top: 1px solid var(--color-border-light);
}

.cta-content {
    max-width: 560px;
    margin: 0 auto;
    text-align: center;
}

.cta-content h2 {
    font-family: var(--font-serif);
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.cta-content p {
    font-size: 1.1rem;
    margin-bottom: var(--space-lg);
}

/* ==========================================
   FOOTER
   ========================================== */

.footer {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
}

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

.footer-name {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-link {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-text);
}

/* ==========================================
   ANIMATIONS
   ========================================== */

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title,
.hero-subtitle,
.hero-cta {
    animation: fadeUp 0.6s ease both;
}

.hero-subtitle {
    animation-delay: 0.1s;
}

.hero-cta {
    animation-delay: 0.2s;
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 1024px) {
    .approach-section .container {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .approach-visual {
        order: -1;
    }

    .approach-diagram {
        flex-direction: row;
        align-items: center;
        gap: 0;
    }

    .diagram-connector {
        width: 32px;
        height: 1px;
    }
}

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

    section {
        padding: var(--space-2xl) 0;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--space-md);
        gap: var(--space-sm);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

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

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

    .approach-diagram {
        flex-direction: column;
    }

    .diagram-connector {
        width: 1px;
        height: 24px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .footer-inner {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

/* ==========================================
   UTILITY: PAGE STYLES (for other pages)
   ========================================== */

.page-header {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: calc(80px + var(--space-xl)) var(--space-lg) var(--space-lg);
}

.page-header h1 {
    font-family: var(--font-serif);
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.page-header .lead {
    font-size: 1.2rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.page-content {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: var(--space-lg) var(--space-lg) var(--space-3xl);
}

.page-content h2 {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.page-content p {
    font-size: 1.05rem;
    line-height: 1.75;
    margin-bottom: var(--space-md);
}

.page-content ul {
    list-style: none;
    margin: var(--space-md) 0;
}

.page-content li {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-secondary);
}

.page-content li strong {
    color: var(--color-text);
}

/* Work page */
.work-grid {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg) var(--space-3xl);
}

.case-study {
    padding: var(--space-lg);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.case-study-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    background: var(--color-accent-light);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-sm);
}

.case-study h3 {
    margin-bottom: var(--space-md);
}

.case-study h4 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
}

.case-study p {
    font-size: 0.95rem;
}

.case-study ul {
    list-style: none;
    margin-top: var(--space-xs);
}

.case-study li {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    padding: 0.35rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.case-study li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.85rem;
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
}

/* Writing page */
.article-section {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--space-lg) var(--space-xl);
}

.article-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border-light);
    flex-wrap: wrap;
}

.article-filters {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.filter-link {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
    position: relative;
}

.filter-link:hover {
    color: var(--color-text);
}

.filter-link.active {
    color: var(--color-text);
}

.filter-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--color-accent);
}

.article-search input {
    width: 160px;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    font-size: 0.85rem;
    transition: border-color var(--transition-fast), width var(--transition-base);
}

.article-search input:focus {
    outline: none;
    border-color: var(--color-text-muted);
    width: 200px;
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.article-card {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-light);
    transition: background var(--transition-fast);
}

.article-card:first-child {
    padding-top: 0;
}

.article-card:last-child {
    border-bottom: none;
}

.article-date {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    display: block;
    margin-bottom: var(--space-xs);
}

.article-card h3 {
    font-family: var(--font-serif);
    font-weight: 500;
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
    line-height: 1.35;
}

.article-card h3 a {
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.article-card h3 a:hover {
    color: var(--color-accent);
}

.article-card p {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--space-xs);
}

.article-read-time {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.no-results {
    text-align: center;
    padding: var(--space-xl) 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* Subscribe section */
.subscribe-section {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg) var(--space-3xl);
    text-align: center;
}

.subscribe-section h2 {
    font-family: var(--font-serif);
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.subscribe-desc {
    margin-bottom: var(--space-md);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.subscribe-form {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.subscribe-form input {
    width: 240px;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-bg-alt);
    font-size: 0.9rem;
}

.subscribe-form input:focus {
    outline: none;
    border-color: var(--color-text-muted);
}

@media (max-width: 600px) {
    .article-toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .article-search input {
        width: 100%;
    }
    
    .article-search input:focus {
        width: 100%;
    }
    
    .subscribe-form {
        flex-direction: column;
        align-items: stretch;
    }
    
    .subscribe-form input {
        width: 100%;
    }
}

/* Contact page */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.contact-card {
    padding: var(--space-lg);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    transition: border-color var(--transition-fast);
}

.contact-card:hover {
    border-color: var(--color-accent);
}

.contact-icon {
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.contact-card h3 {
    margin-bottom: var(--space-xs);
}

.contact-card a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

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


/* Post page */
.post {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: calc(var(--space-3xl) + 72px) var(--space-lg) var(--space-3xl);
}

.post-header {
    margin-bottom: var(--space-xl);
}

.post-kicker {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.post-header h1 {
    margin-bottom: var(--space-sm);
    text-wrap: balance;
    line-height: 1.2;
    padding-top: 0.12em;
    padding-bottom: 0.04em;
}

.post-meta {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.post-lead {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
}

.post-hero {
    margin: 0 0 var(--space-xl);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: var(--color-bg-alt);
}

.post-hero img {
    width: 100%;
    display: block;
}

.post-hero figcaption {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    padding: var(--space-xs) var(--space-sm);
    border-top: 1px solid var(--color-border);
}

.post-content h2 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-xs);
}

.post-content p,
.post-content li {
    font-size: 0.98rem;
    line-height: 1.7;
}

.post-content ul {
    padding-left: 1.25rem;
    margin: var(--space-xs) 0 var(--space-md);
}



/* Post page spacing */
.post-header {
    margin-bottom: var(--space-2xl);
}

.post-hero {
    margin-bottom: var(--space-2xl);
}

.post-content p {
    margin-bottom: var(--space-md);
}

.post-content ul {
    margin-bottom: var(--space-lg);
}


.nav-back {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.nav-back:hover {
    color: var(--color-text);
}