*, *::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;
    --success:         #1f8a65;
    --error:           #cf2d56;

    --r-xs:   4px;
    --r-sm:   6px;
    --r-md:   8px;
    --r-lg:   12px;
    --r-xl:   16px;
    --r-pill: 9999px;

    --font-sans: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--canvas);
    color: var(--body);
    font-family: var(--font-sans);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
address { font-style: normal; }
ul { list-style: none; }

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

.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;
    justify-content: space-between;
    height: 64px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}
.logo-mark {
    color: var(--primary);
    font-size: 20px;
    line-height: 1;
}
.logo-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.01em;
}
.main-nav { display: flex; align-items: center; }
.nav-list { display: flex; align-items: center; gap: 4px; }
.nav-link {
    display: block;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 500;
    color: var(--ink);
    border-radius: var(--r-sm);
    transition: color 0.15s, background 0.15s;
}
.nav-link:hover { background: var(--surface-strong); color: var(--ink); }
.nav-dropdown { position: relative; }
.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
    padding: 8px;
    min-width: 220px;
    z-index: 200;
}
.dropdown-menu li a {
    display: block;
    padding: 8px 12px;
    font-size: 14px;
    color: var(--ink);
    border-radius: var(--r-sm);
}
.dropdown-menu li a:hover { background: var(--canvas); }
.nav-dropdown:hover .dropdown-menu { display: block; }
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform 0.2s, opacity 0.2s;
}

.hero-band {
    padding: 80px 0;
    border-bottom: 1px solid var(--hairline);
}
.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}
.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;
    border-radius: var(--r-pill);
    padding: 4px 10px;
    margin-bottom: 20px;
}
.hero-h1 {
    font-size: 56px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -1.5px;
    color: var(--ink);
    margin-bottom: 20px;
}
.hero-sub {
    font-size: 16px;
    color: var(--body);
    line-height: 1.6;
    max-width: 480px;
    margin-bottom: 32px;
}
.hero-img-wrap {
    border-radius: var(--r-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
}
.hero-img-wrap img {
    width: 100%;
    height: 360px;
    object-fit: cover;
}
.hero-meta {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}
.hero-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.hero-stat-value {
    font-size: 22px;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.3px;
}
.hero-stat-label {
    font-size: 13px;
    color: var(--muted);
}

.section {
    padding: 80px 0;
}
.section + .section {
    border-top: 1px solid var(--hairline-soft);
}
.section-label {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 12px;
}
.section-title {
    font-size: 36px;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.72px;
    line-height: 1.2;
    margin-bottom: 16px;
}
.section-sub {
    font-size: 16px;
    color: var(--body);
    max-width: 560px;
    line-height: 1.6;
    margin-bottom: 48px;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.article-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--r-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: 24px; }
.article-card-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 8px;
}
.article-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    line-height: 1.3;
    margin-bottom: 12px;
}
.article-card-excerpt {
    font-size: 14px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 20px;
}
.article-card-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
}
.article-card-link:hover { color: var(--primary-active); }

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}
.feature-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
    padding: 24px;
}
.feature-icon {
    width: 40px;
    height: 40px;
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    margin-bottom: 16px;
}
.feature-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 8px;
}
.feature-text {
    font-size: 14px;
    color: var(--body);
    line-height: 1.6;
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}
.two-col-img {
    border-radius: var(--r-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
}
.two-col-img img {
    width: 100%;
    height: 340px;
    object-fit: cover;
}
.two-col-content { padding-top: 8px; }
.two-col-content .section-title { margin-bottom: 16px; }
.two-col-content p {
    font-size: 16px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 16px;
}
.two-col-content ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 8px;
}
.two-col-content ul li {
    display: flex;
    gap: 12px;
    font-size: 14px;
    color: var(--body);
    line-height: 1.5;
}
.two-col-content ul li::before {
    content: '→';
    color: var(--primary);
    flex-shrink: 0;
    font-weight: 600;
}

.form-section { background: var(--canvas-soft); }
.form-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
    padding: 48px;
    max-width: 640px;
    margin: 0 auto;
}
.form-title {
    font-size: 26px;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.3px;
    margin-bottom: 8px;
}
.form-sub {
    font-size: 14px;
    color: var(--body);
    margin-bottom: 32px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
    width: 100%;
    background: var(--surface-card);
    border: 1px solid var(--hairline-strong);
    border-radius: var(--r-md);
    padding: 12px 16px;
    height: 44px;
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--ink);
    transition: border-color 0.15s;
    outline: none;
}
.form-group textarea { height: 120px; resize: vertical; }
.form-group input:focus,
.form-group textarea:focus { border-color: var(--ink); }
.form-group input.error,
.form-group textarea.error { border-color: var(--error); }
.form-group .field-error {
    font-size: 12px;
    color: var(--error);
    margin-top: 4px;
    display: none;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.btn-primary {
    background: var(--primary);
    color: var(--on-primary);
    border: none;
    border-radius: var(--r-md);
    padding: 10px 18px;
    height: 40px;
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: background 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-primary:hover { background: var(--primary-active); }
.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(--r-md);
    padding: 10px 18px;
    height: 40px;
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: background 0.15s;
}
.btn-secondary:hover { background: var(--canvas); }
.form-success {
    display: none;
    text-align: center;
    padding: 24px;
}
.form-success-icon {
    width: 48px;
    height: 48px;
    background: #e6f4ef;
    border-radius: var(--r-pill);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin: 0 auto 16px;
}
.form-success p {
    font-size: 16px;
    color: var(--body);
}
.form-success strong { color: var(--ink); }

.article-page { padding: 48px 0 80px; }
.article-container { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.article-breadcrumb {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 32px;
    display: flex;
    gap: 8px;
    align-items: center;
}
.article-breadcrumb a { color: var(--muted); }
.article-breadcrumb a:hover { color: var(--ink); }
.article-breadcrumb span { color: var(--muted-soft); }
.article-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 12px;
}
.article-h1 {
    font-size: 42px;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.8px;
    line-height: 1.15;
    margin-bottom: 16px;
}
.article-meta {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 32px;
    flex-wrap: wrap;
}
.article-hero-img {
    width: 100%;
    height: 380px;
    object-fit: cover;
    border-radius: var(--r-lg);
    border: 1px solid var(--hairline);
    margin-bottom: 40px;
}
.article-body h2 {
    font-size: 26px;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.3px;
    margin: 40px 0 16px;
}
.article-body h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin: 28px 0 12px;
}
.article-body p {
    font-size: 16px;
    color: var(--body);
    line-height: 1.7;
    margin-bottom: 20px;
}
.article-body ul,
.article-body ol {
    margin-bottom: 20px;
    padding-left: 24px;
}
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li {
    font-size: 16px;
    color: var(--body);
    line-height: 1.7;
    margin-bottom: 6px;
}
.article-body a { color: var(--primary); }
.article-body a:hover { color: var(--primary-active); }
.article-body figure {
    margin: 32px 0;
}
.article-body figure img {
    width: 100%;
    border-radius: var(--r-lg);
    border: 1px solid var(--hairline);
}
.article-body figcaption {
    font-size: 13px;
    color: var(--muted);
    text-align: center;
    margin-top: 8px;
}
.article-info-box {
    background: var(--canvas-soft);
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
    padding: 24px;
    margin: 32px 0;
}
.article-info-box h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 12px;
}
.article-info-box ul { list-style: disc; padding-left: 20px; }
.article-info-box li {
    font-size: 14px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 4px;
}
.article-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 14px;
}
.article-table th {
    background: var(--canvas-soft);
    border: 1px solid var(--hairline);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--ink);
}
.article-table td {
    border: 1px solid var(--hairline);
    padding: 10px 14px;
    color: var(--body);
}
.article-table tr:nth-child(even) td { background: var(--canvas-soft); }

.article-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--hairline);
}
.article-nav a {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
}
.article-nav a:hover { color: var(--primary-active); }

.page-header {
    padding: 64px 0 48px;
    border-bottom: 1px solid var(--hairline);
}
.page-h1 {
    font-size: 42px;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.72px;
    margin-bottom: 12px;
}
.page-sub {
    font-size: 16px;
    color: var(--body);
    max-width: 560px;
}
.page-body { padding: 64px 0; max-width: 760px; }
.page-body h2 {
    font-size: 22px;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.2px;
    margin: 40px 0 12px;
}
.page-body p {
    font-size: 16px;
    color: var(--body);
    line-height: 1.7;
    margin-bottom: 16px;
}
.page-body ul {
    list-style: disc;
    padding-left: 24px;
    margin-bottom: 16px;
}
.page-body li {
    font-size: 16px;
    color: var(--body);
    line-height: 1.7;
    margin-bottom: 6px;
}
.page-updated {
    font-size: 13px;
    color: var(--muted);
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--hairline);
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 64px;
    align-items: start;
    padding: 64px 0;
}
.about-img {
    border-radius: var(--r-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
    margin-top: 8px;
}
.about-img img {
    width: 100%;
    height: 340px;
    object-fit: cover;
}
.about-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.about-sidebar-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
    padding: 20px;
}
.about-sidebar-card h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 8px;
}
.about-sidebar-card p {
    font-size: 13px;
    color: var(--body);
    line-height: 1.6;
}

.site-footer {
    background: var(--canvas);
    border-top: 1px solid var(--hairline);
    padding: 64px 0 0;
}
.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}
.footer-tagline {
    font-size: 14px;
    color: var(--body);
    line-height: 1.6;
}
.footer-heading {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 16px;
}
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a {
    font-size: 14px;
    color: var(--body);
}
.footer-links a:hover { color: var(--ink); }
.footer-contact p {
    font-size: 14px;
    color: var(--body);
    line-height: 1.6;
}
.footer-contact a { color: var(--body); }
.footer-contact a:hover { color: var(--ink); }
.footer-bottom {
    border-top: 1px solid var(--hairline);
    padding: 20px 0;
}
.footer-bottom-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    flex-wrap: wrap;
}
.footer-copy {
    font-size: 13px;
    color: var(--muted);
}
.footer-disclaimer {
    font-size: 12px;
    color: var(--muted-soft);
    max-width: 500px;
    line-height: 1.5;
}

.cookie-banner {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    width: min(560px, calc(100vw - 32px));
    background: var(--surface-card);
    border: 1px solid var(--hairline-strong);
    border-radius: var(--r-lg);
    box-shadow: 0 4px 20px rgba(38,37,30,0.12);
}
.cookie-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 20px;
    flex-wrap: wrap;
}
.cookie-text {
    font-size: 14px;
    color: var(--body);
    flex: 1;
}
.cookie-text a { color: var(--primary); }
.cookie-actions { display: flex; gap: 8px; flex-shrink: 0; }

.updated-note {
    font-size: 13px;
    color: var(--muted);
    margin-top: 4px;
}

@media (max-width: 1024px) {
    .hero-h1 { font-size: 42px; }
    .articles-grid { grid-template-columns: 1fr 1fr; }
    .features-grid { grid-template-columns: 1fr 1fr; }
    .footer-inner { grid-template-columns: 1fr 1fr 1fr; }
    .two-col { gap: 48px; }
    .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .main-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--canvas); border-bottom: 1px solid var(--hairline); padding: 16px; }
    .main-nav.open { display: block; }
    .nav-list { flex-direction: column; align-items: flex-start; gap: 4px; }
    .nav-dropdown:hover .dropdown-menu { display: none; }
    .dropdown-menu { display: none; position: static; box-shadow: none; margin-top: 4px; border: none; border-radius: 0; padding: 0 0 0 16px; }
    .nav-toggle { display: flex; }
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-h1 { font-size: 36px; }
    .hero-img-wrap { order: -1; }
    .articles-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .two-col { grid-template-columns: 1fr; gap: 32px; }
    .form-row { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .footer-bottom-inner { flex-direction: column; }
    .section-title { font-size: 28px; }
    .article-h1 { font-size: 32px; }
    .page-h1 { font-size: 32px; }
}

@media (max-width: 480px) {
    .hero-h1 { font-size: 28px; }
    .footer-inner { grid-template-columns: 1fr; }
    .form-card { padding: 24px; }
    .hero-band { padding: 48px 0; }
    .section { padding: 48px 0; }
}