@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400&display=swap');

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

:root {
    --canvas: #f7f7f4;
    --canvas-soft: #fafaf7;
    --surface-card: #ffffff;
    --surface-strong: #e6e5e0;
    --primary: #f54e00;
    --primary-active: #d04200;
    --on-primary: #ffffff;
    --ink: #26251e;
    --body: #5a5852;
    --body-strong: #26251e;
    --muted: #807d72;
    --muted-soft: #a09c92;
    --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;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--body);
    background-color: var(--canvas);
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--ink); }
img { max-width: 100%; display: block; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.03em;
}
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-uppercase { font-size: 11px; font-weight: 600; line-height: 1.4; letter-spacing: 0.88px; text-transform: uppercase; }
.muted { color: var(--muted); }

code, pre, .code { font-family: 'JetBrains Mono', monospace; font-size: 13px; }

/* Navigation */
.site-nav {
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    height: 64px;
    position: sticky;
    top: 0;
    z-index: 100;
}
.site-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}
.nav-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.5px;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}
.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--body);
    transition: color 0.15s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }
.nav-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--ink);
}
.nav-hamburger svg { display: block; }

/* Hero */
.hero-band {
    padding: 80px 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
}
.hero-band .hero-label {
    display: inline-block;
    background: var(--surface-strong);
    color: var(--ink);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: var(--rounded-pill);
    margin-bottom: 24px;
}
.hero-band h1 { margin-bottom: 20px; }
.hero-band .hero-sub {
    font-size: 16px;
    color: var(--body);
    max-width: 580px;
    margin-bottom: 48px;
    line-height: 1.5;
}
.hero-image-wrap {
    margin-top: 48px;
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
    background: var(--surface-card);
}
.hero-image-wrap img { width: 100%; height: 420px; object-fit: cover; }

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

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

.btn-download {
    display: inline-flex;
    align-items: center;
    background: var(--ink);
    color: var(--canvas);
    font-size: 14px;
    font-weight: 500;
    padding: 12px 20px;
    height: 44px;
    border-radius: var(--rounded-md);
    border: none;
    cursor: pointer;
    transition: opacity 0.15s;
    text-decoration: none;
}
.btn-download:hover { opacity: 0.85; color: var(--canvas); }

/* Sections */
.section { padding: 80px 0; }
.section-label {
    display: inline-block;
    background: var(--surface-strong);
    color: var(--ink);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: var(--rounded-pill);
    margin-bottom: 20px;
}
.section-head { margin-bottom: 48px; }
.section-head h2 { margin-bottom: 12px; }
.section-head p { color: var(--body); max-width: 560px; }
.section-divider { border: none; border-top: 1px solid var(--hairline); margin: 0; }

/* Cards */
.feature-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 24px;
}
.feature-card h4 { font-size: 18px; font-weight: 600; margin-bottom: 12px; letter-spacing: 0; }
.feature-card p { color: var(--body); font-size: 15px; line-height: 1.6; }

.card-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

/* Article Cards */
.article-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    transition: border-color 0.15s;
}
.article-card:hover { border-color: var(--hairline-strong); }
.article-card-img { width: 100%; height: 200px; object-fit: cover; }
.article-card-body { padding: 20px; }
.article-card-tag {
    display: inline-block;
    background: var(--surface-strong);
    color: var(--muted);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    padding: 3px 8px;
    border-radius: var(--rounded-xs);
    margin-bottom: 12px;
}
.article-card h3 { font-size: 20px; font-weight: 400; margin-bottom: 8px; color: var(--ink); }
.article-card p { font-size: 14px; color: var(--body); line-height: 1.6; margin-bottom: 16px; }
.article-card-meta { font-size: 13px; color: var(--muted); }

/* Article Page */
.article-hero { padding: 64px 0 48px; border-bottom: 1px solid var(--hairline); }
.article-hero .article-tag {
    display: inline-block;
    background: var(--surface-strong);
    color: var(--muted);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: var(--rounded-pill);
    margin-bottom: 20px;
}
.article-hero h1 { font-size: 48px; line-height: 1.15; letter-spacing: -1.5px; margin-bottom: 16px; max-width: 800px; }
.article-meta { font-size: 14px; color: var(--muted); }
.article-meta span + span::before { content: " · "; }
.article-featured-img { margin: 48px 0; border-radius: var(--rounded-lg); overflow: hidden; border: 1px solid var(--hairline); }
.article-featured-img img { width: 100%; height: 480px; object-fit: cover; }

.article-body { padding: 48px 0 80px; }
.article-content { max-width: 720px; }
.article-content p { font-size: 16px; line-height: 1.7; color: var(--body); margin-bottom: 24px; }
.article-content h2 { font-size: 28px; margin-top: 48px; margin-bottom: 16px; color: var(--ink); }
.article-content h3 { font-size: 22px; margin-top: 32px; margin-bottom: 12px; color: var(--ink); }
.article-content ul, .article-content ol { padding-left: 24px; margin-bottom: 24px; }
.article-content li { font-size: 16px; line-height: 1.7; color: var(--body); margin-bottom: 8px; }
.article-content a { color: var(--primary); border-bottom: 1px solid transparent; transition: border-color 0.15s; }
.article-content a:hover { border-bottom-color: var(--primary); }
.article-content blockquote {
    border-left: 3px solid var(--hairline-strong);
    padding: 16px 20px;
    margin: 24px 0;
    background: var(--canvas-soft);
    border-radius: 0 var(--rounded-sm) var(--rounded-sm) 0;
}
.article-content blockquote p { margin-bottom: 0; color: var(--muted); }
.info-box {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 24px;
    margin: 32px 0;
}
.info-box .info-box-title { font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.info-box ul { padding-left: 20px; }
.info-box li { font-size: 15px; color: var(--body); line-height: 1.6; margin-bottom: 6px; }

/* Sidebar / Article layout */
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 48px; align-items: start; }
.sidebar-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 20px;
    margin-bottom: 20px;
}
.sidebar-card .sidebar-title { font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.88px; color: var(--muted); margin-bottom: 16px; }
.sidebar-link-list { list-style: none; }
.sidebar-link-list li { border-top: 1px solid var(--hairline-soft); }
.sidebar-link-list li:first-child { border-top: none; }
.sidebar-link-list a { display: block; padding: 10px 0; font-size: 14px; color: var(--body); line-height: 1.4; transition: color 0.15s; }
.sidebar-link-list a:hover { color: var(--ink); }

/* Form */
.contact-section { padding: 80px 0; background: var(--canvas-soft); border-top: 1px solid var(--hairline); }
.form-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 40px;
    max-width: 600px;
}
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 14px; font-weight: 500; color: var(--ink); margin-bottom: 8px; }
.form-input {
    width: 100%;
    background: var(--surface-card);
    color: var(--ink);
    font-size: 16px;
    font-family: inherit;
    padding: 12px 16px;
    height: 44px;
    border: 1px solid var(--hairline-strong);
    border-radius: var(--rounded-md);
    outline: none;
    transition: border-color 0.15s;
}
.form-input:focus { border-color: var(--ink); }
.form-input.error { border-color: var(--semantic-error); }
textarea.form-input { height: auto; resize: vertical; min-height: 120px; }
.form-error { font-size: 13px; color: var(--semantic-error); margin-top: 4px; display: none; }
.form-error.visible { display: block; }
.form-submit-wrap { margin-top: 24px; }
.form-success {
    display: none;
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 24px;
    text-align: center;
    color: var(--semantic-success);
    font-size: 15px;
}
.form-success.visible { display: block; }

/* Footer */
.site-footer {
    background: var(--canvas);
    border-top: 1px solid var(--hairline);
    padding: 64px 0 48px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}
.footer-brand { font-size: 18px; font-weight: 600; color: var(--ink); margin-bottom: 12px; }
.footer-desc { font-size: 14px; color: var(--body); line-height: 1.6; max-width: 220px; }
.footer-col-title { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { font-size: 14px; color: var(--body); transition: color 0.15s; }
.footer-links a:hover { color: var(--ink); }
.footer-bottom { border-top: 1px solid var(--hairline); padding-top: 24px; display: flex; align-items: center; justify-content: space-between; }
.footer-copy { font-size: 13px; color: var(--muted); }
.footer-disclaimer { font-size: 12px; color: var(--muted-soft); max-width: 640px; line-height: 1.5; }

/* Cookie Banner */
.cookie-banner {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 48px);
    max-width: 720px;
    background: var(--ink);
    color: var(--canvas);
    border-radius: var(--rounded-lg);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    z-index: 999;
    box-shadow: none;
}
.cookie-banner p { font-size: 14px; line-height: 1.5; color: var(--canvas); flex: 1; }
.cookie-banner p a { color: var(--primary); text-decoration: underline; }
.cookie-actions { display: flex; gap: 12px; flex-shrink: 0; }
.cookie-accept {
    background: var(--primary);
    color: var(--on-primary);
    font-size: 13px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--rounded-md);
    border: none;
    cursor: pointer;
    height: 36px;
}
.cookie-reject {
    background: transparent;
    color: var(--canvas);
    font-size: 13px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--rounded-md);
    border: 1px solid rgba(247,247,244,0.3);
    cursor: pointer;
    height: 36px;
}

/* Page header for inner pages */
.page-header { padding: 64px 0 48px; border-bottom: 1px solid var(--hairline); }
.page-header h1 { font-size: 48px; letter-spacing: -1.5px; margin-bottom: 12px; }
.page-header p { font-size: 16px; color: var(--body); max-width: 560px; }
.page-updated { font-size: 13px; color: var(--muted); margin-top: 8px; }
.page-body { padding: 64px 0; }
.page-content { max-width: 800px; }
.page-content h2 { font-size: 26px; margin-top: 48px; margin-bottom: 16px; }
.page-content h3 { font-size: 20px; margin-top: 28px; margin-bottom: 10px; }
.page-content p { font-size: 16px; line-height: 1.7; color: var(--body); margin-bottom: 20px; }
.page-content ul, .page-content ol { padding-left: 24px; margin-bottom: 20px; }
.page-content li { font-size: 16px; line-height: 1.7; color: var(--body); margin-bottom: 6px; }
.page-content a { color: var(--primary); }

/* Mobile */
.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0; right: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    padding: 16px 24px;
    z-index: 99;
}
.mobile-menu.open { display: block; }
.mobile-menu ul { list-style: none; }
.mobile-menu li { border-top: 1px solid var(--hairline-soft); }
.mobile-menu a { display: block; padding: 14px 0; font-size: 16px; color: var(--ink); }

/* Responsive */
@media (max-width: 1024px) {
    h1 { font-size: 56px; }
    .article-layout { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    h1 { font-size: 36px; letter-spacing: -1px; }
    h2 { font-size: 28px; }
    .nav-links { display: none; }
    .nav-hamburger { display: flex; }
    .hero-band { padding: 48px 0; }
    .section { padding: 48px 0; }
    .card-grid-3, .card-grid-2 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 12px; align-items: flex-start; }
    .cookie-banner { flex-direction: column; align-items: flex-start; bottom: 0; border-radius: var(--rounded-lg) var(--rounded-lg) 0 0; }
    .article-hero h1 { font-size: 32px; }
    .form-card { padding: 24px; }
    .hero-image-wrap img { height: 240px; }
    .article-featured-img img { height: 280px; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
}