/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --success-color: #16a34a;
    --success-light: #dcfce7;
    --danger-color: #dc2626;
    --danger-light: #fee2e2;
    --warning-color: #ea580c;
    --warning-light: #ffedd5;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

header h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.username {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Main Content */
main {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* Balance Card */
.balance-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    margin-bottom: 30px;
}

.balance-card h2 {
    font-size: 1rem;
    font-weight: 500;
    opacity: 0.9;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.balance-amount {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.last-updated {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* Balance Mini (on transaction pages) */
.balance-mini {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.balance-mini .label {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.balance-mini .amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Action Buttons */
.action-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 40px;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 24px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.btn-icon {
    font-size: 1.5rem;
    font-weight: 700;
}

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

.btn-deposit:hover {
    background-color: #15803d;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-withdrawal {
    background-color: var(--warning-color);
    color: white;
}

.btn-withdrawal:hover {
    background-color: #c2410c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-airtime {
    background-color: #7c3aed;
    color: white;
}

.btn-airtime:hover {
    background-color: #6d28d9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-mpesa {
    background-color: #16a34a;
    color: white;
}

.btn-mpesa:hover {
    background-color: #15803d;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-sms {
    background-color: #0891b2;
    color: white;
}

.btn-sms:hover {
    background-color: #0e7490;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary {
    width: 100%;
    margin-top: 8px;
}

/* Page Header */
.page-header {
    margin-bottom: 24px;
}

.back-link {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 12px;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--primary-color);
}

.page-header h2 {
    font-size: 1.75rem;
    color: var(--text-primary);
}

/* Messages */
.message {
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.message.success {
    background-color: var(--success-light);
    color: #15803d;
    border-left: 4px solid var(--success-color);
}

.message.error {
    background-color: var(--danger-light);
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

/* Transaction Form */
.transaction-form {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 24px;
}

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

.input-wrapper {
    position: relative;
}

.currency-symbol {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input[type="number"],
.form-group input[type="text"] {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input[type="number"] {
    padding-left: 36px;
    font-size: 1.25rem;
    font-weight: 600;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.2s;
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-hint {
    margin-top: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.message-stats {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.estimated-cost {
    font-weight: 600;
    color: var(--primary-color);
}

/* Quick Amounts */
.quick-amounts {
    margin-bottom: 24px;
}

.quick-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.quick-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.quick-btn {
    padding: 12px;
    background-color: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-primary);
}

.quick-btn:hover {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
}

/* Airtime Info */
.airtime-info {
    background-color: var(--bg-color);
    border-left: 4px solid #7c3aed;
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 24px;
}

.airtime-info h4 {
    color: var(--text-primary);
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.airtime-info ul {
    margin-left: 20px;
}

.airtime-info li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 6px;
}

/* SMS Info */
.sms-info {
    background-color: var(--bg-color);
    border-left: 4px solid #0891b2;
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 24px;
}

.sms-info h4 {
    color: var(--text-primary);
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.sms-info ul {
    margin-left: 20px;
}

.sms-info li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 6px;
}

/* Transactions Section */
.transactions-section {
    margin-top: 40px;
}

.transactions-section h3 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.no-transactions {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.transactions-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.transaction-item {
    background-color: var(--card-bg);
    padding: 16px 20px;
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid transparent;
    transition: transform 0.2s;
}

.transaction-item:hover {
    transform: translateX(4px);
}

.transaction-item.deposit {
    border-left-color: var(--success-color);
}

.transaction-item.withdrawal {
    border-left-color: var(--warning-color);
}

.transaction-info {
    display: flex;
    gap: 12px;
    align-items: center;
    flex: 1;
}

.transaction-type {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}

.deposit-icon {
    background-color: var(--success-light);
    color: var(--success-color);
}

.withdrawal-icon {
    background-color: var(--warning-light);
    color: var(--warning-color);
}

.type-label {
    font-weight: 600;
    color: var(--text-primary);
}

.transaction-details .description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.transaction-details .date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.transaction-amount {
    font-size: 1.25rem;
    font-weight: 700;
    white-space: nowrap;
}

.transaction-amount.deposit {
    color: var(--success-color);
}

.transaction-amount.withdrawal {
    color: var(--warning-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px 20px;
    margin-top: 40px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Tablet Styles */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }

    header h1 {
        font-size: 1.75rem;
    }

    .balance-amount {
        font-size: 2.5rem;
    }

    .action-buttons {
        grid-template-columns: 1fr;
    }

    .transaction-form {
        padding: 24px;
    }

    .quick-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .balance-mini .amount {
        font-size: 1.25rem;
    }

    .transaction-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .transaction-amount {
        align-self: flex-end;
    }
}

/* Mobile Styles */
@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    .balance-card {
        padding: 24px 20px;
    }

    .balance-amount {
        font-size: 2rem;
    }

    .action-buttons {
        grid-template-columns: 1fr;
    }

    .transaction-form {
        padding: 20px;
    }

    .quick-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .balance-mini {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .page-header h2 {
        font-size: 1.5rem;
    }

    .transaction-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}