:root {
    --primary: #2C3E50;
    --secondary: #3498DB;
    --bg: #F8F9FA;
    --card-bg: #FFFFFF;
    --text: #333333;
    --border: #EEEEEE;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.header {
    background: var(--primary);
    color: white;
    padding: 1rem 2rem;
}

.header h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.7);
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    font-size: 1rem;
}

.nav-btn.active {
    color: white;
    border-bottom-color: var(--secondary);
}

.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.card-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.countdown-timer {
    font-size: 1.2rem;
    font-weight: bold;
    color: #E74C3C;
    margin-bottom: 0.5rem;
}

.query-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.query-tab {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 4px;
}

.query-tab.active {
    background: var(--secondary);
    color: white;
    border-color: var(--secondary);
}

.query-form {
    margin-bottom: 1rem;
}

.footer {
    text-align: center;
    padding: 2rem;
    color: #999;
    font-size: 0.9rem;
}