:root {
    --canvas: #f7f7f4;
    --canvas-soft: #fafaf7;
    --surface-card: #ffffff;
    --surface-strong: #e6e5e0;
    --primary: #f54e00;
    --primary-active: #d04200;
    --ink: #26251e;
    --body: #5a5852;
    --body-strong: #26251e;
    --muted: #807d72;
    --muted-soft: #a09c92;
    --on-primary: #ffffff;
    --hairline: #e6e5e0;
    --hairline-soft: #efeee8;
    --hairline-strong: #cfcdc4;
    --semantic-success: #1f8a65;
    --semantic-error: #cf2d56;
    --rounded-xs: 4px;
    --rounded-sm: 6px;
    --rounded-md: 8px;
    --rounded-lg: 12px;
    --rounded-xl: 16px;
    --rounded-pill: 9999px;
    --spacing-xxs: 4px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-base: 16px;
    --spacing-md: 20px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-section: 80px;
    --font-sans: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --max-width: 1200px;
}

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

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

body {
    background-color: var(--canvas);
    color: var(--body);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--primary); }

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

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

.site-header {
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 64px;
}

.header-inner {
    display: flex;
    align-items: center;
    height: 64px;
    gap: var(--spacing-xl);
}

.logo {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 18px;
    color: var(--ink);
    text-decoration: none;
    letter-spacing: -0.3px;
    flex-shrink: 0;
}

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

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

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

.main-nav a {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--body);
    text-decoration: none;
    transition: color 0.15s;
}

.main-nav a:hover,
.main-nav a.active { color: var(--ink); }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    margin-left: auto;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform 0.2s, opacity 0.2s;
}

h1, h2, h3, h4 {
    font-family: var(--font-sans);
    color: var(--ink);
    font-weight: 400;
}

h1 { font-size: 72px; line-height: 1.1; letter-spacing: -2.16px; }
h2 { font-size: 36px; line-height: 1.2; letter-spacing: -0.72px; }
h3 { font-size: 26px; line-height: 1.25; letter-spacing: -0.325px; }
h4 { font-size: 22px; line-height: 1.3; letter-spacing: -0.11px; }

.title-md { font-size: 18px; font-weight: 600; line-height: 1.4; color: var(--ink); }
.title-sm { font-size: 16px; font-weight: 600; line-height: 1.4; color: var(--ink); }
.body-sm { font-size: 14px; line-height: 1.5; }
.caption { font-size: 13px; line-height: 1.4; color: var(--muted); }
.caption-upper {
    font-size: 11px;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
}

.hero {
    padding: var(--spacing-section) 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline-soft);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-section);
    align-items: center;
}

.hero-text { max-width: 560px; }

.hero-label {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    background: var(--surface-strong);
    border-radius: var(--rounded-pill);
    padding: 4px 10px;
    margin-bottom: var(--spacing-lg);
}

.hero h1 { margin-bottom: var(--spacing-lg); }

.hero-desc {
    font-size: 16px;
    color: var(--body);
    line-height: 1.5;
    margin-bottom: var(--spacing-xl);
    max-width: 480px;
}

.hero-image {
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
}

.hero-image img {
    width: 100%;
    height: 420px;
    object-fit: cover;
}

.section { padding: var(--spacing-section) 0; }

.section-label {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    background: var(--surface-strong);
    border-radius: var(--rounded-pill);
    padding: 4px 10px;
    margin-bottom: var(--spacing-lg);
}

.section-title { margin-bottom: var(--spacing-md); }
.section-desc { color: var(--body); max-width: 600px; margin-bottom: var(--spacing-xxl); }

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

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg);
    transition: border-color 0.15s;
}

.card:hover { border-color: var(--hairline-strong); }

.card-image {
    border-radius: var(--rounded-md);
    overflow: hidden;
    margin-bottom: var(--spacing-base);
    border: 1px solid var(--hairline-soft);
}

.card-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: var(--spacing-xs);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    line-height: 1.4;
    margin-bottom: var(--spacing-xs);
}

.card-title a { text-decoration: none; color: inherit; }
.card-title a:hover { color: var(--primary); }

.card-excerpt { font-size: 14px; color: var(--body); line-height: 1.5; }

.card-meta {
    font-size: 13px;
    color: var(--muted);
    margin-top: var(--spacing-base);
    padding-top: var(--spacing-base);
    border-top: 1px solid var(--hairline-soft);
}

.divider { border: none; border-top: 1px solid var(--hairline); margin: var(--spacing-section) 0; }

.page-hero {
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    border-bottom: 1px solid var(--hairline-soft);
}

.page-hero .caption-upper { margin-bottom: var(--spacing-base); }
.page-hero h1 { font-size: 48px; letter-spacing: -1.2px; margin-bottom: var(--spacing-base); }
.page-hero .lead { font-size: 18px; color: var(--body); max-width: 700px; line-height: 1.5; }

.article-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-section);
    padding: var(--spacing-section) 0;
}

.article-body h2 { font-size: 28px; margin: var(--spacing-xxl) 0 var(--spacing-base); }
.article-body h3 { font-size: 22px; margin: var(--spacing-xl) 0 var(--spacing-sm); }
.article-body p { margin-bottom: var(--spacing-base); color: var(--body); }
.article-body ul, .article-body ol { margin-bottom: var(--spacing-base); padding-left: var(--spacing-xl); color: var(--body); }
.article-body li { margin-bottom: var(--spacing-xs); }
.article-body figure { margin: var(--spacing-xl) 0; }
.article-body figure img { border-radius: var(--rounded-lg); border: 1px solid var(--hairline); }
.article-body figcaption { font-size: 13px; color: var(--muted); margin-top: var(--spacing-xs); }
.article-body a { color: var(--primary); }

.article-meta {
    display: flex;
    gap: var(--spacing-base);
    align-items: center;
    font-size: 13px;
    color: var(--muted);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--hairline-soft);
    flex-wrap: wrap;
}

.article-sidebar { position: sticky; top: 80px; align-self: start; }

.sidebar-box {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-base);
}

.sidebar-box .title-sm { margin-bottom: var(--spacing-base); }
.sidebar-box ul { list-style: none; }
.sidebar-box li { border-bottom: 1px solid var(--hairline-soft); padding: var(--spacing-xs) 0; }
.sidebar-box li:last-child { border-bottom: none; }
.sidebar-box a { font-size: 14px; text-decoration: none; color: var(--body); }
.sidebar-box a:hover { color: var(--primary); }

.infobox {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-left: 3px solid var(--primary);
    border-radius: var(--rounded-md);
    padding: var(--spacing-base) var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.infobox p { margin-bottom: 0; font-size: 14px; }

.table-wrap { overflow-x: auto; margin: var(--spacing-xl) 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { background: var(--surface-strong); color: var(--ink); font-weight: 600; text-align: left; padding: var(--spacing-sm) var(--spacing-base); border-bottom: 1px solid var(--hairline); }
td { padding: var(--spacing-sm) var(--spacing-base); border-bottom: 1px solid var(--hairline-soft); color: var(--body); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--canvas-soft); }

.page-content { padding: var(--spacing-section) 0; max-width: 800px; }
.page-content h2 { font-size: 26px; margin: var(--spacing-xxl) 0 var(--spacing-base); }
.page-content h3 { font-size: 20px; margin: var(--spacing-xl) 0 var(--spacing-sm); }
.page-content p { margin-bottom: var(--spacing-base); color: var(--body); }
.page-content ul, .page-content ol { margin-bottom: var(--spacing-base); padding-left: var(--spacing-xl); color: var(--body); }
.page-content li { margin-bottom: var(--spacing-xs); }

.contact-form-section { padding: var(--spacing-section) 0; }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-section);
}

.form-group { margin-bottom: var(--spacing-lg); }

label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--ink);
    margin-bottom: var(--spacing-xs);
}

input[type="text"],
input[type="email"],
input[type="tel"],
textarea {
    width: 100%;
    background: var(--surface-card);
    color: var(--ink);
    border: 1px solid var(--hairline-strong);
    border-radius: var(--rounded-md);
    padding: 12px 16px;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    height: 44px;
    transition: border-color 0.15s;
    outline: none;
}

input:focus, textarea:focus { border-color: var(--ink); }
input.invalid, textarea.invalid { border-color: var(--semantic-error); }

textarea { height: auto; min-height: 120px; resize: vertical; }

.form-error {
    font-size: 13px;
    color: var(--semantic-error);
    margin-top: var(--spacing-xxs);
    display: none;
}

.form-error.visible { display: block; }

.btn-primary {
    background: var(--primary);
    color: var(--on-primary);
    border: none;
    border-radius: var(--rounded-md);
    padding: 10px 18px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 500;
    height: 40px;
    cursor: pointer;
    transition: background 0.15s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-primary:hover, .btn-primary:focus { background: var(--primary-active); color: var(--on-primary); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-secondary {
    background: var(--surface-card);
    color: var(--ink);
    border: 1px solid var(--hairline-strong);
    border-radius: var(--rounded-md);
    padding: 10px 18px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 500;
    height: 40px;
    cursor: pointer;
    transition: border-color 0.15s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

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

.form-submit-wrap { display: flex; align-items: center; gap: var(--spacing-base); }

.form-status {
    font-size: 14px;
    display: none;
}

.form-status.success { color: var(--semantic-success); display: block; }
.form-status.loading { color: var(--muted); display: block; }

.cookie-banner {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 64px);
    max-width: 780px;
    background: var(--ink);
    color: var(--canvas);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    z-index: 200;
    display: none;
}

.cookie-banner.visible { display: block; }

.cookie-inner {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.cookie-inner p { font-size: 14px; flex: 1; color: var(--canvas); }
.cookie-inner a { color: var(--canvas); }

.cookie-actions { display: flex; gap: var(--spacing-sm); flex-shrink: 0; }

#cookie-accept {
    background: var(--primary);
    color: var(--on-primary);
    border: none;
    border-radius: var(--rounded-md);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

#cookie-reject {
    background: transparent;
    color: var(--canvas);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: var(--rounded-md);
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
}

.site-footer {
    background: var(--canvas);
    border-top: 1px solid var(--hairline);
    padding: 64px 0 48px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xxl);
}

.footer-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: var(--spacing-xs);
}

.footer-tagline { font-size: 14px; color: var(--muted); }

.footer-heading { font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: var(--spacing-base); text-transform: uppercase; letter-spacing: 0.5px; }

.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: var(--spacing-xs); }
.site-footer a { font-size: 14px; color: var(--body); text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

.footer-bottom {
    background: var(--canvas);
    border-top: 1px solid var(--hairline-soft);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xxl);
}

.footer-bottom p { font-size: 13px; color: var(--muted); }
.footer-bottom a { color: var(--muted); }

.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-section);
    padding: var(--spacing-section) 0;
    align-items: start;
}

.about-image { border-radius: var(--rounded-lg); overflow: hidden; border: 1px solid var(--hairline); }
.about-image img { width: 100%; height: 360px; object-fit: cover; }

.references-list { margin: var(--spacing-xl) 0; }
.references-list li { margin-bottom: var(--spacing-xs); font-size: 14px; color: var(--body); }
.references-list a { color: var(--body); }
.references-list a:hover { color: var(--primary); }

.disclaimer {
    background: var(--canvas-soft);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-md);
    padding: var(--spacing-base) var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    font-size: 13px;
    color: var(--muted);
}

@media (max-width: 1024px) {
    h1 { font-size: 56px; letter-spacing: -1.5px; }
    .hero-inner { grid-template-columns: 1fr; gap: var(--spacing-xxl); }
    .hero-text { max-width: 100%; }
    .hero-image img { height: 300px; }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .article-layout { grid-template-columns: 1fr; }
    .article-sidebar { position: static; }
    .footer-inner { grid-template-columns: 1fr 1fr; gap: var(--spacing-xl); }
    .about-intro { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .container { padding: 0 var(--spacing-base); }
    h1 { font-size: 36px; letter-spacing: -0.9px; }
    .hero { padding: var(--spacing-xxl) 0; }
    .section { padding: var(--spacing-xxl) 0; }
    .nav-toggle { display: flex; }
    .main-nav {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--canvas);
        border-bottom: 1px solid var(--hairline);
        padding: var(--spacing-base);
        display: none;
    }
    .main-nav.open { display: block; }
    .main-nav ul { flex-direction: column; gap: 0; }
    .main-nav li { border-bottom: 1px solid var(--hairline-soft); }
    .main-nav a { display: block; padding: var(--spacing-sm) 0; }
    .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr; gap: var(--spacing-xl); }
    .cookie-banner { width: calc(100% - 32px); bottom: var(--spacing-base); }
    .cookie-inner { flex-direction: column; gap: var(--spacing-base); align-items: flex-start; }
}

@media (max-width: 640px) {
    .page-hero h1 { font-size: 32px; letter-spacing: -0.5px; }
    .article-layout { padding: var(--spacing-xxl) 0; }
}