:root {
    --primary-color: #7b2cbf;
    --nav-bg: linear-gradient(180deg, #3c096c 0%, #240046 100%);
    --primary-gradient: linear-gradient(135deg, #9d4edd 0%, #7b2cbf 50%, #5a189a 100%);
    
    /* Unified Purple Metallic Style */
    --metallic-bg: linear-gradient(135deg, #9d4edd 0%, #7b2cbf 50%, #5a189a 100%);
    --metallic-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.3), inset 0 -2px 4px rgba(0, 0, 0, 0.3), 0 4px 10px rgba(0, 0, 0, 0.3);
    --metallic-glow: 0 0 15px rgba(157, 78, 221, 0.5);

    --medal-gold: #ffd700;
    --medal-silver: #c0c0c0;
    --medal-bronze: #cd7f32;

    --background-color: #f0f2f5;
    --text-color: #1a1a1a;
    --card-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --input-bg: #ffffff;
    --input-border: #dcdcdc;
    --footer-bg: #e9ecef;
}

[data-theme='dark'] {
    --background-color: #0f0f0f;
    --text-color: #f0f0f0;
    --card-background: #1a1a1a;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --input-bg: #2a2a2a;
    --input-border: #333333;
    --footer-bg: #151515;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    margin: 0; background-color: var(--background-color); color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    overflow-x: hidden;
}

/* Metallic Button Class */
.auth-btn, .theme-toggle, .back-btn, .btn-metallic, .vote-btn {
    background: var(--metallic-bg);
    color: white !important;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    padding: 0.6rem 1.5rem;
    font-weight: 800;
    cursor: pointer;
    box-shadow: var(--metallic-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    font-size: 0.85rem;
}
.auth-btn:hover, .theme-toggle:hover, .back-btn:hover, .btn-metallic:hover, .vote-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--metallic-shadow), var(--metallic-glow);
    filter: brightness(1.1);
}

/* Navigation */
.top-nav {
    background: var(--nav-bg); color: white; padding: 0.8rem 0;
    position: sticky; top: 0; z-index: 2000; box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
.nav-container {
    max-width: 1200px; margin: 0 auto; display: flex;
    justify-content: space-between; align-items: center; padding: 0 1.5rem;
}
.nav-logo { font-size: 1.5rem; font-weight: 900; cursor: pointer; letter-spacing: -1px; }
.nav-menu { display: flex; gap: 1.5rem; align-items: center; }
.nav-links { display: flex; gap: 2rem; }
.nav-item { color: white; text-decoration: none; text-align: center; }
.main-label { font-weight: 700; font-size: 0.9rem; }
.sub-label { font-size: 0.65rem; color: #ffcc00; display: block; }

.menu-toggle { display: none; background: none; border: none; color: white; font-size: 1.8rem; cursor: pointer; }

/* Header */
header { background: var(--primary-gradient); color: white; text-align: center; padding: 5rem 1rem; box-shadow: var(--metallic-shadow); }
.main-title {
    font-size: clamp(3rem, 10vw, 6rem); font-weight: 900; margin: 0; cursor: pointer;
    background: linear-gradient(to bottom, #fff 30%, #ddd 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3)); letter-spacing: -2px;
}

/* Search Section & Container Alignment */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; box-sizing: border-box; }
.search-section { padding: 4rem 0 2rem 0; width: 100%; }
.search-wrapper { position: relative; width: 100%; max-width: 800px; margin: 0 auto; }
#searchInput {
    width: 100%; padding: 1.2rem 3.5rem 1.2rem 1.8rem;
    border: none; border-radius: 50px; background: var(--input-bg);
    color: var(--text-color); font-size: 1.1rem; box-shadow: 0 8px 24px var(--shadow-color);
    box-sizing: border-box; transition: transform 0.3s;
}
.search-icon { position: absolute; right: 25px; top: 50%; transform: translateY(-50%); font-size: 1.3rem; opacity: 0.5; }

/* Coin List */
.coin-list {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem; padding: 2rem 0;
}
coin-card {
    background: var(--card-background); border-radius: 20px;
    box-shadow: 0 10px 20px var(--shadow-color); cursor: pointer;
    overflow: hidden; transition: transform 0.3s;
}
coin-card:hover { transform: translateY(-8px); }

/* Detail View Viewport Optimization */
.hidden { display: none !important; }
.chart-container {
    width: 100%; height: 75vh; min-height: 450px; max-height: 800px;
    background: #131722; border-radius: 24px; overflow: hidden;
    margin-bottom: 3rem; box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

/* Mobile Menu Fix */
@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .nav-menu {
        position: fixed; top: 60px; right: -100%; width: 260px; height: calc(100vh - 60px);
        background: var(--nav-bg); flex-direction: column; padding: 2rem; gap: 2rem;
        transition: right 0.3s ease; box-shadow: -5px 0 15px rgba(0,0,0,0.2);
        align-items: stretch; z-index: 3000;
    }
    .nav-menu.active { right: 0; }
    .nav-links { flex-direction: column; gap: 1.5rem; }
    .auth-btn, .theme-toggle { width: 100%; }
    .detail-header { text-align: center; justify-content: center; }
    .main-title { font-size: 3.5rem; }
}

footer { text-align: center; padding: 4rem; background: var(--footer-bg); margin-top: 6rem; }