:root {
    /* Premium Color Palette (HSL for maximum flexibility) */
    --h: 222;
    --s: 47%;
    --bg-main: hsl(var(--h), var(--s), 6%);
    --bg-card: hsla(0, 0%, 100%, 0.05);
    --bg-glass: hsla(0, 0%, 100%, 0.03);
    --text-primary: hsl(210, 40%, 98%);
    --text-secondary: hsl(215, 25%, 72%);
    
    /* Accents - Vibrant & Modern */
    --accent-pink: hsl(330, 81%, 60%);
    --accent-purple: hsl(260, 90%, 66%);
    --accent-cyan: hsl(190, 90%, 50%);
    --accent-gradient: linear-gradient(135deg, var(--accent-pink) 0%, var(--accent-purple) 100%);
    --accent-glow: 0 0 20px hsla(330, 81%, 60%, 0.3);
    
    /* Surfaces & Borders */
    --glass-border: hsla(0, 0%, 100%, 0.1);
    --glass-border-bright: hsla(0, 0%, 100%, 0.2);
    --card-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
    --shadow-premium: 0 30px 60px -12px rgba(0, 0, 0, 0.6);
    
    /* Motion Tokens */
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Base Reset & Typography */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

body {
    font-family: 'Zen Kaku Gothic New', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 0% 0%, hsla(330, 81%, 60%, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, hsla(190, 90%, 50%, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.8;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Header & Navigation */
.header {
    background: transparent;
    text-align: center;
    padding: 8rem 1.5rem 6rem;
    position: relative;
}

.header h1 {
    font-size: clamp(3rem, 10vw, 5rem);
    font-weight: 950;
    letter-spacing: 0.2em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 20px hsla(330, 81%, 60%, 0.4));
    margin-bottom: 1rem;
    animation: titleEntrance 1.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes titleEntrance {
    from { opacity: 0; transform: translateY(30px) scale(0.95); filter: blur(10px); }
    to { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}

.header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    opacity: 0.8;
}

.main-nav {
    display: flex;
    justify-content: center;
    gap: 3rem;
    padding: 1.5rem;
    background: hsla(222, 47%, 6%, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 2000;
}

.main-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    transition: var(--transition-base);
    position: relative;
    padding: 0.5rem 0;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition-base);
    transform: translateX(-50%);
}

.main-nav a:hover, .main-nav a.active {
    color: var(--text-primary);
}

.main-nav a:hover::after, .main-nav a.active::after {
    width: 100%;
}

/* Era Navigation */
.era-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 2rem 1rem;
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 0 auto;
}

.era-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.6rem 1.5rem;
    border-radius: 99px;
    background: hsla(0, 0%, 100%, 0.05);
    border: 1px solid var(--glass-border);
    transition: var(--transition-smooth);
}

.era-link:hover {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
    transform: translateY(-5px);
    box-shadow: var(--accent-glow);
}

/* Layout Containers */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
}

/* Hero Card */
.hero-card {
    background: var(--bg-card);
    border-radius: 48px;
    padding: 6rem 4rem;
    margin-bottom: 8rem;
    border: 1px solid var(--glass-border);
    text-align: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(40px);
    box-shadow: var(--shadow-premium);
}

.hero-card h2 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    line-height: 1.1;
    margin-bottom: 2rem;
    font-weight: 950;
    color: var(--text-primary);
}

.hero-card p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 4rem;
}

/* Daily Pickup Widget */
.pickup-widget {
    background: linear-gradient(135deg, hsla(330, 81%, 60%, 0.1), hsla(260, 90%, 66%, 0.1));
    border: 1px solid hsla(330, 81%, 60%, 0.3);
    border-radius: 32px;
    padding: 3rem;
    margin-bottom: 6rem;
    position: relative;
}

.pickup-tag {
    position: absolute;
    top: -15px;
    left: 40px;
    background: var(--accent-gradient);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 99px;
    font-weight: 800;
    font-size: 0.8rem;
    letter-spacing: 2px;
    box-shadow: var(--accent-glow);
}

/* Timeline Components */
.timeline {
    position: relative;
    padding-left: 4rem;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 14px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-pink), var(--accent-purple), transparent);
}

.era-group {
    margin-bottom: 10rem;
}

.era-badge {
    display: inline-block;
    background: var(--accent-gradient);
    color: white;
    padding: 0.8rem 2.5rem;
    border-radius: 99px;
    font-weight: 900;
    font-size: 1.4rem;
    margin-bottom: 4rem;
    box-shadow: 0 15px 30px hsla(330, 81%, 60%, 0.3);
    position: relative;
    left: -4.5rem;
}

.timeline-item {
    margin-bottom: 6rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 30px;
    left: -3.85rem;
    width: 20px;
    height: 20px;
    background: var(--bg-main);
    border: 4px solid var(--accent-pink);
    border-radius: 50%;
    z-index: 10;
    box-shadow: 0 0 15px hsla(330, 81%, 60%, 0.5);
}

.timeline-content {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    padding: 4rem;
    border-radius: 40px;
    border: 1px solid var(--glass-border);
    transition: var(--transition-smooth);
    box-shadow: var(--card-shadow);
}

.timeline-content:hover {
    transform: translateX(15px) translateY(-5px);
    background: hsla(0, 0%, 100%, 0.08);
    border-color: var(--glass-border-bright);
    box-shadow: var(--shadow-premium);
}

/* Idol Grid & Cards */
.idol-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.idol-card {
    background: hsla(0, 0%, 100%, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 28px;
    padding: 2rem;
    text-decoration: none;
    color: inherit;
    transition: var(--transition-bounce);
    display: flex;
    flex-direction: column;
}

.idol-card:hover {
    transform: translateY(-15px) scale(1.03);
    background: hsla(0, 0%, 100%, 0.08);
    border-color: var(--accent-pink);
    box-shadow: var(--shadow-premium);
}

.card-img {
    width: 100%;
    height: 180px;
    border-radius: 20px;
    margin-bottom: 1.5rem;
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}

.card-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
}

.idol-card h5 {
    font-size: 1.2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* Column Grid & Cards */
.column-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.column-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    text-decoration: none;
    color: inherit;
    transition: var(--transition-bounce);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    backdrop-filter: blur(20px);
}

.column-card:hover {
    transform: translateY(-15px);
    background: hsla(0, 0%, 100%, 0.08);
    border-color: var(--accent-pink);
    box-shadow: var(--shadow-premium);
}

.column-card-img {
    width: 100%;
    height: 200px;
    background-size: cover;
    background-position: center;
    position: relative;
}

.column-card-body {
    padding: 2.5rem;
}

.column-card h4 {
    font-size: 1.4rem;
    font-weight: 900;
    margin: 1rem 0;
    color: var(--text-primary);
}

.column-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.topic-label {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: hsla(0, 0%, 100%, 0.1);
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--accent-cyan);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* Share Section */
.share-section {
    background: var(--bg-card);
    border-radius: 40px;
    padding: 4rem;
    text-align: center;
    border: 1px solid var(--glass-border);
    margin: 8rem 0;
}

.btn-share {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    padding: 1.2rem 3rem;
    border-radius: 99px;
    text-decoration: none;
    font-weight: 800;
    color: white;
    transition: var(--transition-smooth);
}

.btn-x { background: #000; border: 1px solid var(--glass-border); }
.btn-line { background: #06C755; }

.btn-share:hover {
    transform: scale(1.05);
    filter: brightness(1.2);
}

/* Footer */
footer {
    padding: 6rem 1.5rem;
    text-align: center;
    border-top: 1px solid var(--glass-border);
    background: hsla(222, 47%, 4%, 0.8);
    backdrop-filter: blur(20px);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-base);
}

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

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .header { padding: 6rem 1.5rem 4rem; }
    .hero-card { padding: 4rem 2rem; }
    .timeline { padding-left: 2rem; }
    .timeline::before { left: 9px; }
    .timeline-item::before { left: -2.35rem; width: 16px; height: 16px; }
    .era-badge { left: -2rem; padding: 0.6rem 1.5rem; font-size: 1.1rem; }
    .timeline-content { padding: 2.5rem; }
}