:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --danger: #ea4335;
    --danger-dark: #c5221f;
    --success: #34a853;
    --bg: #f8f9fa;
    --card: #ffffff;
    --text: #202124;
    --border: #dadce0;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.display {
    background: var(--card);
    border-bottom: 2px solid var(--border);
    padding: 1rem 2rem;
    flex-shrink: 0;
}

.display-row {
    display: flex;
    gap: 1rem;
    justify-content: space-between;
}

.display-box {
    flex: 1;
    text-align: center;
    padding: 1rem;
    background: #eef3f9;
    border-radius: 12px;
}

.display-box.change {
    background: #e6f4ea;
}

.display-box .label {
    display: block;
    font-size: 1rem;
    color: #5f6368;
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.display-box .amount {
    display: block;
    font-size: 3rem;
    font-weight: 700;
}

.main {
    display: flex;
    flex: 1;
    overflow: hidden;
    padding: 1rem;
    gap: 1rem;
}

.tickets {
    flex: 2;
    background: var(--card);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    overflow-y: auto;
}

.payment {
    flex: 1;
    background: var(--card);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

h2 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.ticket-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.ticket-card {
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 140px;
}

.ticket-info {
    margin-bottom: 0.75rem;
}

.ticket-name {
    font-size: 1.2rem;
    font-weight: 600;
}

.ticket-price {
    font-size: 1.1rem;
    color: #5f6368;
}

.ticket-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.ticket-controls button {
    width: 56px;
    height: 56px;
    font-size: 1.8rem;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    user-select: none;
    transition: background 0.1s;
}

.btn-minus {
    background: var(--danger);
    color: white;
}

.btn-minus:hover {
    background: var(--danger-dark);
}

.btn-plus {
    background: var(--success);
    color: white;
}

.btn-plus:hover {
    background: #2d8a47;
}

.ticket-count {
    font-size: 2rem;
    font-weight: 700;
    min-width: 60px;
    text-align: center;
}

.money-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.money-grid button {
    padding: 1.2rem 0;
    font-size: 1.4rem;
    font-weight: 600;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: #f1f3f4;
    cursor: pointer;
    user-select: none;
    transition: background 0.1s;
}

.money-grid button:hover {
    background: #e8eaed;
}

.money-grid button:active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.reset-payment,
.reset-all {
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    margin-bottom: 0.75rem;
}

.reset-payment {
    background: #fde293;
    color: #5f4708;
}

.reset-payment:hover {
    background: #fbd04e;
}

.reset-all {
    background: var(--danger);
    color: white;
}

.reset-all:hover {
    background: var(--danger-dark);
}

@media (max-width: 900px) {
    .main {
        flex-direction: column;
    }

    .display-box .amount {
        font-size: 2rem;
    }

    .ticket-list {
        grid-template-columns: 1fr;
    }
}