:root {
    --color-primary: #2a6ef2;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #f97316;
    --color-text: #1f2937;
    --color-muted: #4b5563;
    --color-background: #ffffff;
    --color-surface: #f8fafc;
    --color-border: #e2e8f0;
    --max-width: 1100px;
    --radius-md: 16px;
    --radius-sm: 10px;
    --shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

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

body {
    font-family: 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--color-text);
    background: var(--color-background);
    line-height: 1.7;
    font-size: 16px;
}

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

a:hover {
    color: var(--color-primary);
}

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

.container {
    width: min(92%, var(--max-width));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 18px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-primary);
}

.brand .logo {
    width: 42px;
    height: 42px;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 15px;
    color: var(--color-muted);
}

.site-nav a {
    transition: color 0.25s ease;
}

.site-nav a.active,
.site-nav a:hover {
    color: var(--color-primary);
}

.cta {
    padding: 10px 18px;
    border-radius: 999px;
    background: rgba(42, 110, 242, 0.08);
    color: var(--color-primary);
    font-weight: 600;
    transition: background 0.25s ease;
}

.cta:hover {
    background: rgba(42, 110, 242, 0.16);
}

.hero {
    padding: 110px 0 90px;
    background: radial-gradient(circle at top right, rgba(42, 110, 242, 0.12), transparent 45%),
                linear-gradient(180deg, rgba(248, 250, 252, 0.6), transparent 80%);
}

.hero .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    align-items: center;
    gap: 48px;
}

.hero-content h1 {
    font-size: clamp(32px, 4vw, 44px);
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 17px;
    color: var(--color-muted);
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 999px;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn.primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 12px 30px rgba(42, 110, 242, 0.2);
}

.btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 40px rgba(42, 110, 242, 0.3);
    background: var(--color-primary-dark);
}

.btn.secondary {
    background: rgba(42, 110, 242, 0.1);
    color: var(--color-primary);
}

.btn.secondary:hover {
    transform: translateY(-1px);
    background: rgba(42, 110, 242, 0.18);
}

.hero-illustration {
    position: relative;
    height: 320px;
}

.hero-illustration .circle {
    position: absolute;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(42, 110, 242, 0.25), rgba(249, 115, 22, 0.25));
    top: 0;
    right: 0;
}

.hero-illustration .triangle {
    position: absolute;
    width: 0;
    height: 0;
    border-left: 120px solid transparent;
    border-right: 120px solid transparent;
    border-bottom: 200px solid rgba(42, 110, 242, 0.2);
    bottom: 20px;
    left: 0;
}

.hero-illustration .dots {
    position: absolute;
    width: 160px;
    height: 160px;
    background-image: radial-gradient(rgba(42, 110, 242, 0.3) 2px, transparent 2px);
    background-size: 16px 16px;
    bottom: 0;
    right: 40px;
    opacity: 0.6;
}

.section {
    padding: 90px 0;
}

.section.light {
    background: var(--color-surface);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header .eyebrow {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.32em;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: clamp(28px, 3vw, 36px);
    margin-bottom: 16px;
}

.section-header p {
    max-width: 640px;
    margin: 0 auto;
    color: var(--color-muted);
}

.columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.card,
.service-card {
    padding: 28px;
    border-radius: var(--radius-md);
    background: var(--color-background);
    border: 1px solid var(--color-border);
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.04);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover,
.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow);
}

.card h3,
.service-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.card p,
.service-card p {
    color: var(--color-muted);
}

.grid {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.link {
    margin-top: 16px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 15px;
}

.link::after {
    content: '→';
    transition: transform 0.2s ease;
}

.link:hover::after {
    transform: translateX(4px);
}

.case-list {
    display: grid;
    gap: 24px;
}

.case {
    padding: 32px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: linear-gradient(135deg, rgba(42, 110, 242, 0.05), rgba(248, 250, 252, 1));
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.05);
}

.case-meta {
    font-size: 13px;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.case h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.case p {
    color: var(--color-muted);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 36px;
    align-items: start;
}

.contact-list {
    list-style: none;
    margin-top: 24px;
    display: grid;
    gap: 12px;
    color: var(--color-muted);
}

.contact-form {
    display: grid;
    gap: 12px;
    padding: 32px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
}

.contact-form label {
    font-weight: 600;
    color: var(--color-text);
}

.contact-form input,
.contact-form textarea {
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: #fff;
    font-size: 15px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(42, 110, 242, 0.15);
}

.contact-form .form-tip {
    font-size: 13px;
    color: var(--color-muted);
    line-height: 1.6;
}

.contact-form button[disabled] {
    opacity: 0.7;
    cursor: not-allowed;
}

.site-footer {
    border-top: 1px solid var(--color-border);
    background: #fff;
    padding: 24px 0;
    font-size: 14px;
    color: var(--color-muted);
}

.site-footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.back-to-top {
    font-weight: 600;
    color: var(--color-primary);
}

.site-footer p {
    margin: 0;
}

.site-footer .cdn-credit {
    display: flex;
    align-items: center;
    gap: 8px;
    color: inherit;
}

.site-footer .cdn-credit a {
    display: inline-flex;
    align-items: center;
}

.site-footer .cdn-credit img {
    height: 26px;
    width: auto;
}

.site-footer .icp-link {
    color: inherit;
    text-decoration: underline;
}

.site-footer .icp-link:hover {
    color: var(--color-primary);
}
@media (max-width: 720px) {
    .site-header .container {
        flex-wrap: wrap;
        justify-content: center;
    }

    .site-nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px;
    }

    .hero {
        padding-top: 140px;
    }

    .hero-illustration {
        display: none;
    }

    .site-footer .container {
        flex-direction: column;
        text-align: center;
    }
}