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

:root {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary: #8b5cf6;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1e293b;
    --light: #f1f5f9;
    --white: #ffffff;
    --text: #334155;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 600px;
}

.card {
    background: var(--white);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header {
    background: linear-gradient(
        135deg,
        var(--primary) 0%,
        var(--secondary) 100%
    );
    padding: 40px 30px;
    text-align: center;
    color: var(--white);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo-icon {
    font-size: 3rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%,
    100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

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

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

/* Tab Styles */
.tab-container {
    display: flex;
    background: var(--light);
    padding: 8px;
    gap: 8px;
    border-bottom: 2px solid var(--border);
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s;
}

.tab-btn:hover {
    background: rgba(14, 165, 233, 0.1);
    color: var(--primary);
}

.tab-btn.active {
    background: linear-gradient(
        135deg,
        var(--primary) 0%,
        var(--secondary) 100%
    );
    color: var(--white);
    box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
}

.form {
    padding: 40px 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text);
    font-weight: 600;
    font-size: 0.95rem;
}

.form-group input {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s;
    font-family: monospace;
    letter-spacing: 1px;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.help-text {
    display: block;
    margin-top: 6px;
    color: var(--text-light);
    font-size: 0.85rem;
}

.btn-submit {
    width: 100%;
    padding: 15px;
    background: linear-gradient(
        135deg,
        var(--primary) 0%,
        var(--secondary) 100%
    );
    color: var(--white);
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.4);
}

.btn-submit:active {
    transform: translateY(0);
}

.btn-submit.loading {
    pointer-events: none;
    opacity: 0.8;
}

.btn-loading {
    display: none;
}

.btn-submit.loading .btn-text {
    display: none;
}

.btn-submit.loading .btn-loading {
    display: inline;
}

.result {
    padding: 0 30px 30px;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.result.hidden {
    display: none;
}

.result-card {
    border: 2px solid var(--border);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 20px;
}

.result-card.success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    border-color: var(--success);
}

.result-card.warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-color: var(--warning);
}

.status-badge {
    display: inline-block;
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.status-badge.lunas {
    background: var(--success);
    color: var(--white);
}

.status-badge.belum {
    background: var(--danger);
    color: var(--white);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

.info-value {
    color: var(--text);
    font-weight: 600;
    text-align: right;
}

.info-value.highlight {
    color: var(--danger);
    font-size: 1.1rem;
}

.bill-total {
    background: var(--primary);
    color: var(--white);
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
    text-align: center;
}

.bill-total .label {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 5px;
}

.bill-total .amount {
    font-size: 2rem;
    font-weight: 700;
}

.foto-section {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 2px dashed var(--border);
}

.foto-section h3 {
    color: var(--text);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.foto-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.foto-item {
    border: 2px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: transform 0.3s;
}

.foto-item:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px var(--shadow);
}

.foto-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    cursor: pointer;
}

.foto-item p {
    padding: 10px;
    text-align: center;
    background: var(--light);
    font-size: 0.85rem;
    color: var(--text);
    font-weight: 600;
}

.alert {
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.alert.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.alert.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.footer {
    text-align: center;
    margin-top: 20px;
    color: var(--white);
    font-size: 0.9rem;
    opacity: 0.9;
}

/* History Section */
.history-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.history-item {
    background: var(--light);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 10px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s;
    min-height: 60px;
}

.history-item:hover {
    background: #e0e7ff;
    border-color: var(--primary);
    transform: translateX(5px);
    box-shadow: 0 5px 15px var(--shadow);
}

#historyCard {
    padding: 20px 25px;
}

#historyCard h3 {
    color: var(--text);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Responsive */
@media (max-width: 600px) {
    .header {
        padding: 30px 20px;
    }

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

    .logo-icon {
        font-size: 2rem;
    }

    .form {
        padding: 30px 20px;
    }

    .result {
        padding: 0 20px 20px;
    }

    .result-card {
        padding: 20px;
    }

    .bill-total .amount {
        font-size: 1.5rem;
    }

    .foto-grid {
        grid-template-columns: 1fr;
    }

    #historyCard {
        padding: 15px;
    }

    .history-item {
        padding: 8px;
        min-height: auto;
        font-size: 11px;
    }

    .history-item > div {
        flex-wrap: wrap;
    }

    .history-item button {
        padding: 4px 8px !important;
        font-size: 11px !important;
    }
} /* Loading Animation */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.btn-loading::before {
    content: "⚡";
    display: inline-block;
    animation: spin 1s linear infinite;
    margin-right: 5px;
}

/* Popup Styles */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(4px);
}

.popup-overlay.show {
    opacity: 1;
}

.popup-content {
    background: var(--white);
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    width: 90%;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.popup-overlay.show .popup-content {
    transform: scale(1);
}

.popup-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--border);
}

.popup-overlay.success .popup-header {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
}

.popup-overlay.warning .popup-header {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
}

.popup-overlay.error .popup-header {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
}

.popup-overlay.info .popup-header {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
}

.popup-header h3 {
    margin: 0;
    color: var(--dark);
    font-size: 1.2rem;
}

.popup-close {
    background: transparent;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text);
    line-height: 1;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.popup-close:hover {
    color: var(--danger);
    transform: rotate(90deg);
}

.popup-body {
    padding: 25px;
    color: var(--text);
    line-height: 1.6;
}

.popup-footer {
    padding: 15px 20px;
    background: var(--light);
    display: flex;
    justify-content: flex-end;
}

.popup-btn {
    background: linear-gradient(
        135deg,
        var(--primary) 0%,
        var(--secondary) 100%
    );
    color: var(--white);
    border: none;
    padding: 10px 30px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.popup-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(139, 92, 246, 0.4);
}

.popup-btn:active {
    transform: translateY(0);
}