:root {
    --primary: #1f6fb2;
    --primary-light: #e7f1fb;
    --accent: #3aa87a;
    --text-main: #1f2933;
    --text-muted: #6b7280;
    --bg: #f5f7fb;
    --card-bg: #ffffff;
    --border: #d1d5db;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* header and navigation */

header {
    background-color: #ffffff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 30;
}

.topbar {
    max-width: 1100px;
    margin: 0 auto;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-box {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-box img {
    height: 48px;
    width: auto;
}

.logo-text-main {
    font-weight: 700;
    font-size: 18px;
    color: var(--primary);
}

.logo-text-sub {
    font-size: 12px;
    color: var(--text-muted);
}

.lang-switch {
    display: flex;
    gap: 6px;
}

.lang-btn {
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background-color: #ffffff;
    font-size: 12px;
    cursor: pointer;
}

.lang-btn.active {
    border-color: var(--primary);
    background-color: var(--primary);
    color: #ffffff;
}

nav {
    border-top: 1px solid var(--border);
}

.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font-size: 14px;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.nav-links a {
    color: var(--text-main);
    font-weight: 500;
}

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

/* hero section */

.hero {
    background: linear-gradient(135deg, var(--primary-light), #ffffff);
    border-bottom: 1px solid var(--border);
}

.hero-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 16px 32px 16px;
    display: grid;
    grid-template-columns: minmax(0, 2.1fr) minmax(0, 1.4fr);
    gap: 28px;
    align-items: center;
}

.hero-kicker {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 8px;
}

.hero-title {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 10px;
}

.hero-text {
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 18px;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.btn-primary {
    padding: 8px 18px;
    background-color: var(--primary);
    color: #ffffff;
    border-radius: 999px;
    border: none;
    font-size: 14px;
    cursor: pointer;
    font-weight: 600;
}

.btn-primary:hover {
    background-color: #155083;
}

.btn-ghost {
    padding: 7px 16px;
    background-color: transparent;
    border-radius: 999px;
    border: 1px solid var(--border);
    font-size: 14px;
    cursor: pointer;
    color: var(--text-main);
}

.hero-side-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    border: 1px solid var(--border);
    padding: 18px 16px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
    font-size: 13px;
}

.hero-side-title {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--primary);
}

.hero-stat-grid {
    margin-top: 12px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.hero-stat {
    text-align: center;
}

.hero-stat-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

.hero-stat-label {
    font-size: 11px;
    color: var(--text-muted);
}

/* page layout */

.page {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 16px 32px 16px;
}

.page h2 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--primary);
}

.page p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-main);
}

/* grids and cards */

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 18px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 14px;
    border: 1px solid var(--border);
    padding: 16px;
    font-size: 14px;
}

.card h3 {
    margin-top: 0;
    font-size: 15px;
    margin-bottom: 6px;
    color: var(--primary);
}

.card p {
    margin: 0;
    font-size: 14px;
    color: var(--text-muted);
}

.project-card {
    margin-top: 14px;
}

/* contact layout */

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr);
    gap: 20px;
    align-items: flex-start;
}

.contact-grid p {
    font-size: 14px;
    line-height: 1.6;
}

/* form elements */

form label {
    display: block;
    font-size: 13px;
    margin-bottom: 4px;
    margin-top: 8px;
}

form input,
form textarea {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
}

form textarea {
    resize: vertical;
}

/* footer */

footer {
    border-top: 1px solid var(--border);
    background-color: #ffffff;
    margin-top: 30px;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
}

/* responsive */

@media (max-width: 800px) {
    .hero-inner {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero-side-card {
        order: -1;
    }

    .grid-3 {
        grid-template-columns: minmax(0, 1fr);
    }

    .nav-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-links {
        justify-content: flex-start;
    }

    .contact-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}