/* === Base === */
:root {
    --bg: #0a0b14;
    --surface: #12152a;
    --surface2: #1a1f38;
    --accent-cyan: #00e5ff;
    --accent-yellow: #ffea00;
    --accent-pink: #ff2d78;
    --text: #e8eaf6;
    --text-muted: #8892b0;
    --radius: 12px;
}

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

body {
    font-family: 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
    color: var(--text);
    background-color: var(--bg);
    line-height: 1.6;
}

/* === Header === */
header {
    padding: 20px 32px;
    background-color: rgba(10, 11, 20, 0.9);
    border-bottom: 2px solid var(--accent-cyan);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

header h1 {
    font-size: 1.2rem;
    font-weight: 900;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
    text-transform: uppercase;
}

nav {
    display: flex;
    gap: 8px;
    align-items: center;
}

nav a {
    padding: 6px 14px;
    color: var(--text);
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: border-color 0.2s, color 0.2s;
}

nav a:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

/* === Main layout === */
main {
    max-width: 960px;
    margin: 0 auto;
    padding: 48px 24px;
}

/* === Hero === */
.hero {
    text-align: center;
    padding: 80px 24px 60px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(0, 229, 255, 0.12) 0%, transparent 60%),
        radial-gradient(circle at 80% 30%, rgba(255, 45, 120, 0.12) 0%, transparent 60%);
    pointer-events: none;
}

.hero-eyebrow {
    display: inline-block;
    padding: 4px 14px;
    background: var(--accent-cyan);
    color: var(--bg);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    border-radius: 4px;
    margin-bottom: 20px;
}

.hero h2 {
    font-size: clamp(2.2rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.hero h2 span {
    color: var(--accent-yellow);
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 480px;
    margin: 0 auto 32px;
}

.button {
    display: inline-block;
    padding: 14px 28px;
    color: var(--bg);
    background-color: var(--accent-cyan);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.04em;
    transition: opacity 0.2s, transform 0.2s;
}

.button:hover {
    opacity: 0.85;
    transform: translateY(-2px);
}

.button-outline {
    display: inline-block;
    padding: 14px 28px;
    color: var(--accent-cyan);
    border: 2px solid var(--accent-cyan);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    margin-left: 12px;
    transition: background-color 0.2s, color 0.2s;
}

.button-outline:hover {
    background-color: var(--accent-cyan);
    color: var(--bg);
}

/* === Section titles === */
.section-title {
    font-size: 1.8rem;
    font-weight: 900;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

.section-title span {
    color: var(--accent-pink);
}

.section-sub {
    color: var(--text-muted);
    margin-bottom: 36px;
    font-size: 0.95rem;
}

/* === Friends grid === */
.friends-section {
    padding: 60px 24px;
    max-width: 960px;
    margin: 0 auto;
}

.friends-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.friend-card {
    background: var(--surface);
    border: 1px solid var(--surface2);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: border-color 0.2s, transform 0.2s;
    position: relative;
    overflow: hidden;
}

.friend-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--card-accent, var(--accent-cyan));
}

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

.friend-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--card-accent, var(--accent-cyan));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 16px;
    opacity: 0.9;
}

.friend-card h3 {
    font-size: 1.2rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.friend-role {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--card-accent, var(--accent-cyan));
    margin-bottom: 12px;
}

.friend-bio {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.65;
}

.friend-tags {
    margin-top: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    padding: 3px 10px;
    background: var(--surface2);
    border-radius: 20px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* === Card (event static) === */
.card {
    background: var(--surface);
    border: 1px solid var(--surface2);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* === Event cards (live page) === */
#events {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 32px;
}

.event-card {
    background: var(--surface);
    border: 1px solid var(--surface2);
    border-radius: var(--radius);
    padding: 24px;
    position: relative;
    overflow: hidden;
    transition: border-color 0.2s, transform 0.2s;
}

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

.event-category {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.cat-workshop { background: rgba(0, 229, 255, 0.15); color: var(--accent-cyan); }
.cat-lt       { background: rgba(255, 45, 120, 0.15); color: var(--accent-pink); }
.cat-exhibition { background: rgba(255, 234, 0, 0.15); color: var(--accent-yellow); }
.cat-hackathon { background: rgba(160, 100, 255, 0.2); color: #c084fc; }

.event-card h3 {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 10px;
    line-height: 1.3;
}

.event-card .desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 16px;
    line-height: 1.6;
}

.event-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-top: 1px solid var(--surface2);
    padding-top: 14px;
    margin-top: auto;
}

.event-meta span::before {
    margin-right: 6px;
}

.event-meta .time::before { content: '🕐'; }
.event-meta .location::before { content: '📍'; }
.event-meta .speaker::before { content: '🎙'; }

.live-hero {
    padding: 48px 0 16px;
    text-align: center;
}

.live-hero h2 {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 8px;
}

.live-hero p {
    color: var(--text-muted);
}

.loading {
    text-align: center;
    padding: 60px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* === Footer === */
footer {
    padding: 32px 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--surface2);
}