:root {
    --bg: #0b1220;
    --bg-alt: #111a2e;
    --card: #16203a;
    --border: #243258;
    --text: #e6eaf2;
    --muted: #9aa7c0;
    --accent: #2ec4b6;
    --accent-dark: #1f948a;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== NAVBAR ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11, 18, 32, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.1rem;
}

.brand .logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #0b1220;
    font-size: 1.1rem;
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== HERO ===== */
.hero {
    padding: 90px 0 80px;
    text-align: center;
    background: radial-gradient(ellipse at top, #14224a 0%, var(--bg) 70%);
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 14px;
}

.hero h1 .highlight {
    color: var(--accent);
}

.hero .tagline {
    font-size: 1.15rem;
    color: var(--muted);
    max-width: 640px;
    margin: 0 auto 34px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: transform 0.15s, opacity 0.15s;
}

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

.btn-primary {
    background: var(--accent);
    color: #0b1220;
}

.btn-outline {
    border: 1px solid var(--accent);
    color: var(--accent);
}

.hero .buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== SECTIONS ===== */
.section {
    padding: 70px 0;
}

.section-alt {
    background: var(--bg-alt);
}

.section h2 {
    font-size: 1.9rem;
    text-align: center;
    margin-bottom: 10px;
}

.section .subtitle {
    text-align: center;
    color: var(--muted);
    max-width: 640px;
    margin: 0 auto 44px;
    font-size: 1rem;
}

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

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 28px 24px;
    transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.card .icon {
    font-size: 1.8rem;
    margin-bottom: 12px;
}

.card h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.card p {
    color: var(--muted);
    font-size: 0.95rem;
}

/* ===== ACTIVITIES ===== */
.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.activity {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 26px 22px;
}

.activity .date {
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.activity h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.activity p {
    color: var(--muted);
    font-size: 0.95rem;
}

/* ===== JOIN / CONTACT ===== */
.join-box {
    max-width: 640px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 36px 32px;
    text-align: center;
}

.join-box p {
    color: var(--muted);
    margin-bottom: 18px;
}

.join-box .contact {
    display: flex;
    justify-content: center;
    gap: 28px;
    flex-wrap: wrap;
    margin-top: 18px;
    font-size: 0.95rem;
}

.join-box .contact span {
    color: var(--muted);
}

.join-box .contact strong {
    color: var(--text);
}

/* ===== FOOTER ===== */
footer {
    border-top: 1px solid var(--border);
    padding: 26px 0;
    background: var(--bg-alt);
}

footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    color: var(--muted);
    font-size: 0.9rem;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        padding: 16px 20px;
        gap: 14px;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .section {
        padding: 50px 0;
    }
}