@import url('variables.css');

:root {
    --spacing-xs: var(--space-xs, 8px);
    --spacing-sm: var(--space-sm, 16px);
    --spacing-md: var(--space-md, 24px);
    --spacing-lg: var(--space-lg, 40px);
    --spacing-xl: var(--space-xl, 64px);

    --border-radius-sm: var(--radius-sm, 8px);
    --border-radius-md: var(--radius-md, 16px);
    --border-radius-lg: var(--radius-lg, 24px);

    --shadow-sm: 0 4px 16px rgba(15, 39, 68, 0.08);
    --shadow-md: 0 12px 32px rgba(15, 39, 68, 0.12);

    --color-primary: var(--color-brand-blue, #1E5AA8);
    --color-secondary: var(--color-spring-green, #22C55E);
    --color-accent: var(--color-warm-orange, #F59E0B);
    --color-background-white: #FFFFFF;
    --color-background-light: var(--color-bg, #F8FAFC);
    --color-text-dark: var(--color-deep-navy, #0F2744);
    --color-text-light: var(--color-slate, #64748B);
}

* {
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: inherit;
}

body {
    margin: 0;
    font-family: var(--font-body, 'Source Han Sans SC', 'PingFang SC', sans-serif);
    color: var(--color-text-dark);
    background-color: var(--color-background-light);
    line-height: 1.7;
}

img {
    max-width: 100%;
    display: block;
    border: none;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

main {
    padding-top: 90px;
}

header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    min-height: 72px;
    box-shadow: var(--shadow-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-text-dark);
}

.logo-icon {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: var(--color-primary);
    color: #FFFFFF;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    margin: 0;
    padding: 0;
    align-items: center;
}

nav li {
    position: relative;
}

nav a {
    color: var(--color-text-dark);
    font-weight: 500;
    padding: 6px 0;
}

.submenu {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    background: #FFFFFF;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-sm);
    min-width: 200px;
    flex-direction: column;
    gap: var(--spacing-xs);
    z-index: 30;
}

nav li:hover > .submenu {
    display: flex;
}

.header-contact .btn {
    margin-left: var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid transparent;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.btn-contact {
    background-color: var(--color-primary);
    color: #FFFFFF;
    box-shadow: var(--shadow-sm);
}

.btn-contact:hover {
    background-color: var(--color-secondary);
}

.banner {
    background: var(--gradient-brand);
    color: #FFFFFF;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.banner-content {
    width: min(900px, 100% - 48px);
    margin: 0 auto;
}

.banner-content h1 {
    font-size: clamp(32px, 4vw, 48px);
    margin-bottom: var(--spacing-sm);
}

.banner-content p {
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

section {
    padding: var(--spacing-xl) 0;
}

.container {
    width: min(1200px, 100% - 48px);
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title h2 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.section-title p {
    margin: 0;
    color: var(--color-text-light);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.card {
    background: var(--color-background-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    height: 100%;
}

.card-image {
    width: 100%;
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    object-fit: cover;
}

.card-title {
    margin: 0 0 var(--spacing-xs);
    color: var(--color-text-dark);
}

.card-description {
    color: var(--color-text-light);
    margin: 0 0 var(--spacing-md);
}

.card-link {
    font-weight: 600;
    color: var(--color-primary);
}

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

footer {
    background: #0B1526;
    color: rgba(255, 255, 255, 0.8);
}

footer h4 {
    color: #FFFFFF;
}

footer ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

footer li {
    margin-bottom: 8px;
}

footer a {
    color: rgba(255, 255, 255, 0.8);
}

footer a:hover {
    color: var(--color-secondary);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-xl) 0;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    text-align: center;
    padding: var(--spacing-md) 0;
    font-size: 0.9rem;
}

form input,
form textarea,
form select {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-border);
    font: inherit;
    background: #FFFFFF;
}

form textarea {
    min-height: 160px;
    resize: vertical;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(30, 90, 168, 0.1);
    color: var(--color-primary);
    font-size: 0.85rem;
}

@media (max-width: 1024px) {
    header {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .header-contact {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 640px) {
    header {
        padding: 0 var(--spacing-md);
    }

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

    nav li {
        width: 100%;
    }

    .header-contact {
        display: flex;
        justify-content: flex-start;
    }

    .banner {
        text-align: left;
    }

    .section-title {
        text-align: left;
    }
}