/* Variables */
:root {
    --primary-color: #0f172a; /* Dark Blue */
    --secondary-color: #10b981; /* Green */
    --text-color: #334155;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --border-radius: 8px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --container-width: 1100px;
    --font-main: system-ui, -apple-system, sans-serif;
}

/* Reset & Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

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

ul {
    list-style: none;
}

/* Layout */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 4rem 0;
}

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

.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }

/* Header */
.site-header {
    background: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.site-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Navigation */
.main-navigation ul {
    display: flex;
    gap: 2rem;
}

.main-navigation a {
    font-weight: 500;
    color: var(--primary-color);
    transition: color 0.3s;
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.menu-toggle .bar {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: 0.3s;
}

/* Hero */
.hero-section {
    background-color: var(--primary-color);
    background-image: linear-gradient(120deg, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.65)), var(--hero-image);
    background-size: cover;
    background-position: center;
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-content {
    max-width: 760px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: transform 0.2s, opacity 0.2s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: var(--white);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    background-color: var(--primary-color);
    color: var(--white);
    margin-top: 1rem;
}

/* Cards & Grid */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid #e2e8f0;
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.page-banner {
    background-color: var(--primary-color);
    background-image: linear-gradient(120deg, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.65)), var(--banner-image);
    background-size: cover;
    background-position: center;
    color: var(--white);
    padding: 4.5rem 0 4rem;
    text-align: center;
}

.page-banner .page-title {
    font-size: 2.4rem;
    margin-bottom: 0.5rem;
}

.page-banner .page-subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 680px;
    margin: 0 auto;
}

.service-card {
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card-media {
    min-height: 190px;
    background-size: cover;
    background-position: center;
}

.card-body {
    padding: 1.75rem;
}

.card-body p {
    margin-bottom: 1rem;
}

.faq-section {
    padding-top: 3rem;
}

.faq-list {
    display: grid;
    gap: 1rem;
}

.faq-item {
    background: var(--white);
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 1rem 1.25rem;
}

.faq-item summary {
    font-weight: 600;
    cursor: pointer;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    float: right;
    font-weight: 700;
}

.faq-item[open] summary::after {
    content: "−";
}

.faq-item p {
    margin-top: 0.75rem;
    color: var(--text-color);
}

.page-title {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.page-subtitle {
    color: inherit;
    opacity: 0.9;
}

.gk-blank-header {
    padding: 16px 20px 8px;
    position: sticky;
    top: 0;
    z-index: 999;
    background: rgba(255, 255, 255, 0.9);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

.gk-blank-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
}

.gk-blank-back-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 999px;
    border: 1px solid #e2e8f0;
    background: var(--white);
    box-shadow: var(--shadow);
    font-size: 20px;
    line-height: 1;
}

.gk-blank-back:hover {
    color: var(--secondary-color);
}

/* Benefits */
.benefits-list {
    margin-top: 2rem;
    font-size: 1.1rem;
}

.benefits-list li {
    margin-bottom: 1rem;
}

/* Contact Page */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 2rem;
}

.contact-details li {
    margin-bottom: 0.5rem;
}

/* Footer */
.site-footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .main-navigation {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .main-navigation.toggled {
        display: block;
    }

    .main-navigation ul {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .hero-title {
        font-size: 2rem;
    }

    .contact-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}