:root {
    --bg-color: #0b0e14;
    --card-bg: #161b22;
    --accent-color: #00d2ff;
    --accent-gradient: linear-gradient(135deg, #00d2ff 0%, #3a7bd5 100%);
    --text-primary: #ffffff;
    --text-secondary: #9aa0a6;
}

body {
    margin: 0;
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header & Back Button */
.header {
    padding: 20px 5%;
    display: flex;
    align-items: center;
}

.back-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: opacity 0.3s;
}

.back-link:hover {
    opacity: 0.7;
}

/* Container */
.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto 40px auto;
    text-align: center;
}

.hero-section h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 10px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 1.1rem;
}

/* Modern Search Box */
.search-box {
    display: flex;
    max-width: 600px;
    margin: 0 auto 40px auto;
    background: #1c2128;
    padding: 8px;
    border-radius: 50px;
    border: 1px solid #30363d;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.search-box input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px 20px;
    color: white;
    font-size: 16px;
    outline: none;
}

.search-box button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--accent-gradient);
    color: white;
    cursor: pointer;
    font-size: 18px;
    transition: transform 0.2s;
}

.search-box button:hover {
    transform: scale(1.05);
}

/* Grid Layout */
#airport-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

/* Airport Card Style */
.airport-card {
    background: var(--card-bg);
    border: 1px solid #30363d;
    padding: 24px;
    border-radius: 20px;
    text-align: left;
    transition: all 0.3s ease;
}

.airport-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-color);
    box-shadow: 0 15px 35px rgba(0, 210, 255, 0.15);
}

.airport-card h3 {
    margin: 0 0 12px 0;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.airport-card p {
    margin: 6px 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.airport-card .code {
    display: inline-block;
    background: rgba(0, 210, 255, 0.1);
    color: var(--accent-color);
    padding: 4px 10px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.8rem;
    margin-top: 10px;
}

/* Loading Spinner */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.1);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}