:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent-color: #FCD535;
    /* Binance Yellow */
    --success-color: #0ecb81;
    --danger-color: #f6465d;
    --input-bg: #2b2b2b;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    padding: 20px;
    padding-bottom: 80px;
    /* Space for footer */
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 20px;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
}

.total-balance-card {
    background: linear-gradient(135deg, #2b2b2b 0%, #1e1e1e 100%);
    padding: 20px 40px;
    border-radius: 16px;
    border: 1px solid #333;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.total-balance-card h2 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.balance-amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.add-coin-section {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    flex-wrap: wrap;
    align-items: center;
}

input {
    background: var(--input-bg);
    border: 1px solid #333;
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
    flex: 1 1 150px;
    /* Allow growing and shrinking, min-width 150px */
    min-width: 120px;
}

input:focus {
    outline: none;
    border-color: var(--accent-color);
}

button {
    background: var(--accent-color);
    color: #000;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s;
}

button:active {
    transform: scale(0.98);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.coin-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid #333;
    transition: transform 0.2s, box-shadow 0.2s;
}

.coin-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.coin-symbol {
    font-size: 1.2rem;
    font-weight: 700;
}

.coin-price {
    font-size: 1.1rem;
    font-weight: 600;
}

.card-body {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.info-value {
    color: var(--text-primary);
    font-weight: 500;
}

.coin-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 10px;
    color: var(--text-primary);
}

.change-percent {
    font-size: 0.9rem;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.positive {
    color: var(--success-color);
    background: rgba(14, 203, 129, 0.1);
}

.negative {
    color: var(--danger-color);
    background: rgba(246, 70, 93, 0.1);
}

.delete-btn {
    background: transparent;
    color: var(--text-secondary);
    padding: 4px;
    font-size: 1.2rem;
    margin-left: 10px;
}

.delete-btn:hover {
    color: var(--danger-color);
}

/* Footer Controls */
.footer-controls {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
    /* Allow clicking through empty space */
}

.footer-controls>* {
    pointer-events: auto;
    /* Re-enable pointer events for children */
}

.language-switcher select {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid #333;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
}

.github-link {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-secondary);
    background: var(--card-bg);
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid #333;
    transition: all 0.2s;
}

.github-link:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
    background: #2b2b2b;
}


/* Detail Icon */
.detail-icon {
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s;
    margin-left: 10px;
}

.detail-icon:hover {
    color: var(--accent-color);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    border: 1px solid #333;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    padding-bottom: 10px;
}

.modal-header h2 {
    font-size: 1.5rem;
    color: var(--accent-color);
}

#close-modal-btn {
    background: transparent;
    color: var(--text-secondary);
    font-size: 2rem;
    padding: 0;
    line-height: 1;
}

#close-modal-btn:hover {
    color: var(--text-primary);
}

/* Order Book */
.order-book-container {
    display: flex;
    gap: 20px;
}

.order-book-column {
    flex: 1;
}

.order-book-column h3 {
    font-size: 1rem;
    margin-bottom: 10px;
    text-align: center;
    color: var(--text-secondary);
}

.order-list {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.order-row {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
}

.bids .order-row {
    color: var(--success-color);
}

.asks .order-row {
    color: var(--danger-color);
}

.order-price {
    font-weight: 600;
}

.order-qty {
    color: var(--text-secondary);
}