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

:root {
    --blue-dark: #1b1b4b;
    --blue-medium: #2d2d6b;
    --gold: #c9a84c;
    --gold-light: #d4b965;
    --white: #ffffff;
    --gray-bg: #f7f7fb;
    --gray-text: #555566;
    --gray-subtle: #888899;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--blue-dark);
    background: var(--white);
    line-height: 1.6;
}

/* === Header === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e8e8f0;
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0.8rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-logo {
    font-size: 1.2rem;
    color: var(--blue-dark);
    letter-spacing: 0.5px;
}

.header-logo strong {
    color: var(--gold);
}

.lang-switch {
    background: transparent;
    border: 1px solid var(--blue-dark);
    color: var(--blue-dark);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    transition: background 0.2s, color 0.2s;
}

.lang-switch:hover {
    background: var(--blue-dark);
    color: var(--white);
}

/* === Hero === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 1.5rem 4rem;
    background: var(--white);
}

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

.hero-logo {
    width: 100%;
    max-width: 420px;
    height: auto;
    margin-bottom: 2rem;
    border-radius: 12px;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--blue-dark);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--gray-text);
    margin-bottom: 2.5rem;
}

/* === CTA Button === */
.cta-button {
    display: inline-block;
    background: var(--gold);
    color: var(--white);
    padding: 0.9rem 2.2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.3px;
    transition: background 0.2s, transform 0.2s;
}

.cta-button:hover {
    background: var(--gold-light);
    transform: translateY(-1px);
}

/* === Concept === */
.concept {
    padding: 5rem 1.5rem;
    background: var(--gray-bg);
    text-align: center;
}

.concept h2 {
    font-size: 1.6rem;
    margin-bottom: 3rem;
    color: var(--blue-dark);
}

.concept-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.concept-card {
    background: var(--white);
    border: 1px solid #e0e0ee;
    border-radius: 12px;
    padding: 2rem 1.5rem;
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.concept-card:hover {
    border-color: var(--gold);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(27, 27, 75, 0.08);
}

.concept-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.concept-card h3 {
    font-size: 1.15rem;
    color: var(--blue-dark);
    margin-bottom: 0.7rem;
}

.concept-card p {
    font-size: 0.95rem;
    color: var(--gray-text);
    line-height: 1.5;
}

/* === Why === */
.why {
    padding: 5rem 1.5rem;
    text-align: center;
    background: var(--white);
}

.why h2 {
    font-size: 1.6rem;
    margin-bottom: 3rem;
    color: var(--blue-dark);
}

.why-grid {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.why-item {
    text-align: left;
    padding: 1.5rem;
}

.why-icon {
    color: var(--gold);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.why-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--blue-dark);
}

.why-item p {
    font-size: 0.95rem;
    color: var(--gray-text);
}

/* === CTA Section === */
.cta-section {
    padding: 4rem 1.5rem;
    text-align: center;
    background: var(--blue-dark);
    color: var(--white);
}

.cta-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.cta-section p {
    color: #b0b0c8;
    margin-bottom: 2rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* === Footer === */
.footer {
    padding: 2rem 1.5rem;
    text-align: center;
    border-top: 1px solid #e8e8f0;
    font-size: 0.85rem;
    color: var(--gray-subtle);
}

.footer p {
    margin-bottom: 0.3rem;
}

.footer a {
    color: var(--gold);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* === Responsive === */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-logo {
        max-width: 300px;
    }

    .concept-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .why-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

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