: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;
}

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

html { scroll-behavior: smooth; }

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

a { color: inherit; text-decoration: none; }
a:hover { color: var(--ink); }

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

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

h1, h2, h3, h4 {
    color: var(--ink);
    font-weight: 400;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

h1 { font-size: 48px; letter-spacing: -0.03em; }
h2 { font-size: 36px; letter-spacing: -0.02em; }
h3 { font-size: 26px; letter-spacing: -0.01em; }
h4 { font-size: 22px; }

p { margin-bottom: 16px; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 20px; }
li { margin-bottom: 8px; }

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 0;
}

.logo-mark {
    color: var(--primary);
    font-size: 22px;
    font-weight: 700;
}

.logo-text { color: var(--ink); }

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 8px;
    padding: 0;
    margin: 0;
}

.main-nav a {
    color: var(--body);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--rounded-md);
    transition: background 0.15s, color 0.15s;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--rounded-md);
}

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

.btn-primary {
    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;
    display: inline-flex;
    align-items: center;
    transition: background 0.15s;
}

.btn-primary:hover { background: var(--primary-active); }

.btn-secondary {
    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;
    display: inline-flex;
    align-items: center;
    transition: background 0.15s;
}

.btn-secondary:hover { background: var(--surface-strong); }

.hero {
    padding: 80px 0;
    border-bottom: 1px solid var(--hairline);
}

.hero-content { max-width: 700px; }

.badge-pill {
    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;
}

.hero h1 { margin-bottom: 20px; }

.hero-desc {
    font-size: 18px;
    color: var(--body);
    margin-bottom: 32px;
    max-width: 560px;
}

.hero-image {
    margin-top: 48px;
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
    max-height: 420px;
}

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

.section { padding: 80px 0; }
.section-alt { background: var(--canvas-soft); border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }

.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 { margin-bottom: 16px; }
.section-intro { font-size: 18px; color: var(--body); max-width: 600px; margin-bottom: 48px; }

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 24px;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--ink);
    letter-spacing: 0;
}

.feature-card p { color: var(--body); font-size: 14px; }

.article-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

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

.article-card-body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card-body h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--ink);
    letter-spacing: 0;
}

.article-card-body p {
    font-size: 14px;
    color: var(--body);
    flex: 1;
    margin-bottom: 16px;
}

.article-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
    border-bottom: 1px solid transparent;
    transition: border-color 0.15s;
    align-self: flex-start;
}

.article-link:hover { border-color: var(--primary); color: var(--primary); }

.article-meta {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 8px;
}

.tips-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.tips-list li {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 20px;
    font-size: 14px;
    color: var(--body);
    margin: 0;
}

.tips-list li strong {
    display: block;
    color: var(--ink);
    font-size: 15px;
    margin-bottom: 6px;
}

.contact-section { padding: 80px 0; }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-info h2 { margin-bottom: 16px; }
.contact-info p { color: var(--body); margin-bottom: 24px; }

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 14px;
    color: var(--body);
}

.contact-form {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 32px;
}

.form-group { margin-bottom: 20px; }

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    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(--rounded-md);
    padding: 12px 16px;
    height: 44px;
    font-size: 16px;
    font-family: inherit;
    color: var(--ink);
    transition: border-color 0.15s;
}

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

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--muted-soft);
}

.form-status {
    display: none;
    padding: 12px 16px;
    border-radius: var(--rounded-md);
    font-size: 14px;
    margin-top: 16px;
}

.form-status.success {
    background: #e8f5f0;
    color: var(--semantic-success);
    border: 1px solid #b3dece;
    display: block;
}

.form-status.loading {
    background: var(--surface-strong);
    color: var(--muted);
    display: block;
}

.page-hero {
    padding: 64px 0 48px;
    border-bottom: 1px solid var(--hairline);
}

.page-hero h1 { margin-bottom: 12px; }
.page-hero p { font-size: 18px; color: var(--body); max-width: 560px; }

.content-body {
    padding: 64px 0;
    max-width: 720px;
}

.content-body h2 { font-size: 28px; margin: 40px 0 16px; }
.content-body h3 { font-size: 22px; margin: 32px 0 12px; }
.content-body p { color: var(--body); line-height: 1.7; margin-bottom: 20px; }
.content-body ul, .content-body ol { color: var(--body); margin-bottom: 20px; }
.content-body li { margin-bottom: 10px; line-height: 1.6; }
.content-body a { color: var(--primary); border-bottom: 1px solid transparent; }
.content-body a:hover { border-color: var(--primary); }

.content-box {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 24px;
    margin: 32px 0;
}

.content-box h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; letter-spacing: 0; }

.article-full { padding: 64px 0; }

.article-full .article-image {
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
    margin-bottom: 40px;
}

.article-full .article-image img {
    width: 100%;
    max-height: 460px;
    object-fit: cover;
}

.article-full h1 { font-size: 42px; margin-bottom: 16px; }
.article-full .article-meta { margin-bottom: 32px; }
.article-full .article-content h2 { font-size: 28px; margin: 40px 0 16px; }
.article-full .article-content h3 { font-size: 22px; margin: 32px 0 12px; }
.article-full .article-content p { color: var(--body); line-height: 1.7; margin-bottom: 20px; }
.article-full .article-content ul,
.article-full .article-content ol { color: var(--body); margin-bottom: 20px; }
.article-full .article-content li { margin-bottom: 10px; line-height: 1.6; }
.article-full .article-content a { color: var(--primary); border-bottom: 1px solid transparent; }
.article-full .article-content a:hover { border-color: var(--primary); }

.step-list {
    list-style: none;
    padding: 0;
    counter-reset: steps;
}

.step-list li {
    counter-increment: steps;
    display: flex;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 20px;
    padding: 20px;
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
}

.step-list li::before {
    content: counter(steps);
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: var(--on-primary);
    border-radius: var(--rounded-pill);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    margin-top: 2px;
}

.step-content { flex: 1; }
.step-content strong { display: block; color: var(--ink); margin-bottom: 4px; }
.step-content p { color: var(--body); font-size: 14px; margin: 0; }

.info-box {
    border-left: 3px solid var(--primary);
    background: var(--surface-card);
    border-radius: 0 var(--rounded-md) var(--rounded-md) 0;
    padding: 16px 20px;
    margin: 24px 0;
    font-size: 14px;
    color: var(--body);
}

.info-box strong { color: var(--ink); display: block; margin-bottom: 4px; }

.ref-list {
    list-style: none;
    padding: 0;
    border-top: 1px solid var(--hairline);
    margin-top: 48px;
    padding-top: 24px;
}

.ref-list li { margin-bottom: 8px; font-size: 13px; color: var(--muted); }
.ref-list a { color: var(--primary); }

.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;
    gap: 48px;
    padding-bottom: 48px;
}

.footer-logo { margin-bottom: 12px; }
.footer-tagline { font-size: 14px; color: var(--body); max-width: 240px; }

.site-footer h3 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 16px;
}

.site-footer ul { list-style: none; padding: 0; }
.site-footer ul li { margin-bottom: 8px; }
.site-footer ul a { font-size: 14px; color: var(--body); transition: color 0.15s; }
.site-footer ul a:hover { color: var(--ink); }

.site-footer address { font-style: normal; font-size: 14px; color: var(--body); }
.site-footer address p { margin-bottom: 4px; }
.site-footer address a { color: var(--body); transition: color 0.15s; }
.site-footer address a:hover { color: var(--ink); }

.footer-bottom {
    border-top: 1px solid var(--hairline);
    padding: 20px 0;
}

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

.cookie-banner {
    display: none;
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--ink);
    color: var(--canvas);
    border-radius: var(--rounded-lg);
    padding: 20px 24px;
    max-width: 560px;
    width: calc(100% - 48px);
    z-index: 999;
    box-shadow: 0 4px 24px rgba(38, 37, 30, 0.15);
}

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

.cookie-title {
    font-weight: 600;
    color: var(--canvas);
    margin-bottom: 6px;
    font-size: 15px;
}

.cookie-desc { font-size: 13px; color: var(--muted-soft); margin-bottom: 16px; }

.cookie-actions { display: flex; gap: 12px; }

.cookie-actions .btn-primary {
    background: var(--primary);
    color: var(--on-primary);
}

.cookie-actions .btn-secondary {
    background: transparent;
    color: var(--canvas);
    border-color: rgba(255,255,255,0.25);
}

.cookie-actions .btn-secondary:hover {
    background: rgba(255,255,255,0.08);
}

@media (max-width: 1024px) {
    h1 { font-size: 40px; }
    h2 { font-size: 30px; }
    .card-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    h1 { font-size: 32px; }
    h2 { font-size: 26px; }

    .nav-toggle { display: flex; }

    .main-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--canvas);
        border-bottom: 1px solid var(--hairline);
        padding: 16px 24px;
    }

    .main-nav.open { display: block; }
    .main-nav ul { flex-direction: column; gap: 4px; }
    .main-nav a { display: block; padding: 10px 12px; }

    .site-header { position: relative; }

    .card-grid { grid-template-columns: 1fr; }
    .card-grid-2 { grid-template-columns: 1fr; }
    .tips-list { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr; gap: 32px; }
    .hero { padding: 48px 0; }
    .section { padding: 48px 0; }
    .article-full h1 { font-size: 30px; }
}

@media (max-width: 640px) {
    .container { padding: 0 16px; }
    .hero-image img { height: 220px; }
}