:root {
    /* Blue Aero Theme */
    --bg-gradient: linear-gradient(135deg, #E0F7FA 0%, #E1F5FE 100%);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: 1px solid rgba(255, 255, 255, 0.6);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);

    --primary-color: #0288D1;
    --secondary-color: #0097A7;
    --danger-color: #D32F2F;
    --success-color: #388E3C;

    --text-color: #37474F;
    --text-light: #607D8B;
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    font-size: 16px;
    min-height: 100vh;
}

header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 15px 20px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: center;
    align-items: center;
}

h1 {
    margin: 0;
    font-size: 24px;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: 0.5px;
}

h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-color);
    margin-top: 0;
}

h3 {
    font-size: 18px;
    font-weight: 500;
    margin: 0;
}

.logout-btn {
    position: absolute;
    right: 20px;
    color: var(--text-light);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    padding: 5px 10px;
    border-radius: 5px;
    transition: all 0.2s;
}

.logout-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--danger-color);
}

main {
    padding: 20px;
    max-width: 500px;
    margin: 0 auto;
    padding-bottom: 100px;
}

/* Cards & Containers */
.login-container,
.dashboard-header,
.debtor-card,
.debtor-header,
.add-debt-form,
.debt-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 12px;
    border: var(--glass-border);
    box-shadow: var(--glass-shadow);
    padding: 20px;
    margin-bottom: 15px;
}

/* Login */
.login-container {
    text-align: center;
    margin-top: 40px;
}

#pin-input {
    font-size: 32px;
    text-align: center;
    width: 180px;
    margin-bottom: 20px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-color);
    font-family: 'Poppins', sans-serif;
    letter-spacing: 5px;
}

.keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    max-width: 280px;
    margin: 0 auto;
}

.keypad button {
    padding: 15px;
    font-size: 20px;
    border: none;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    transition: all 0.1s;
    color: var(--text-color);
    font-weight: 600;
}

.keypad button:active {
    transform: scale(0.95);
    background: #f0f0f0;
}

.enter-btn {
    grid-column: span 3;
    background: linear-gradient(to bottom, #4FC3F7, #039BE5) !important;
    color: white !important;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
}

/* Dashboard */
.dashboard-header {
    text-align: center;
    padding: 25px;
}

.dashboard-header h2 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.backup-btn {
    display: inline-block;
    margin-top: 10px;
    color: var(--text-light);
    text-decoration: none;
    border: 1px solid rgba(0, 0, 0, 0.1);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 13px;
    background: white;
}

/* Search Bar */
.search-container {
    margin-bottom: 25px;
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 15px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    pointer-events: none;
}

#search-input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.8);
    font-size: 16px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    text-align: left;
    text-transform: uppercase;
    transition: all 0.3s ease;
}

#search-input:focus {
    background: white;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.9);
    outline: none;
}

/* --- BUTTONS --- */
button.primary-btn,
button.secondary-btn,
.add-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    color: white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.1s;
    font-family: 'Poppins', sans-serif;
    margin-bottom: 8px;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
}

.primary-btn,
.add-btn {
    background: linear-gradient(to bottom, #66BB6A, #43A047);
}

.secondary-btn {
    background: linear-gradient(to bottom, #42A5F5, #1E88E5);
}

/* Action Bar & Add Button */
.action-bar {
    margin-bottom: 20px;
}

.add-person-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #66BB6A 0%, #43A047 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.add-person-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
    filter: brightness(1.05);
}

.add-person-btn:active {
    transform: translateY(1px);
}

.plus-icon {
    font-size: 24px;
    position: absolute;
    left: 15px;
    top: 15px;
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    display: flex;
    align-items: center;
    background: white;
    padding: 5px 10px;
    border-radius: 15px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* --- DEBTOR LIST (Dashboard) --- */
.debtor-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s;
    padding: 15px 20px;
    margin-bottom: 10px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.debtor-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    background: white;
}

.debtor-info h3 {
    margin: 0;
    font-size: 18px;
    color: var(--text-color);
    text-transform: uppercase;
    font-weight: 600;
}

.debtor-info p {
    margin: 2px 0 0;
    color: var(--text-light);
    font-size: 13px;
}

.debtor-total {
    font-size: 18px;
    font-weight: 700;
    color: var(--danger-color);
    background: rgba(255, 255, 255, 0.5);
    padding: 5px 10px;
    border-radius: 8px;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

/* --- DEBTOR DETAIL VIEW --- */
.debtor-header {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
    position: relative;
    text-align: center;
    /* Center content */
}

.back-btn {
    align-self: flex-start;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 5px;
    display: inline-block;
    padding: 5px 10px;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.03);
}

.debtor-header h2 {
    margin: 0;
    font-size: 28px;
    color: var(--text-color);
    text-transform: uppercase;
}

.debtor-actions {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.total-amount {
    color: var(--danger-color);
    font-weight: 700;
    font-size: 32px;
    display: block;
    margin: 10px 0;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.delete-link {
    display: inline-block;
    margin-top: 5px;
    color: var(--danger-color);
    font-size: 12px;
    text-decoration: none;
    opacity: 0.7;
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 25px;
}

.action-buttons button {
    margin-bottom: 0;
    height: 55px;
    font-size: 15px;
}

/* Month Grouping */
.month-block {
    margin-bottom: 25px;
}

.month-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 10px;
    margin-bottom: 10px;
    border-bottom: 2px solid rgba(0, 0, 0, 0.05);
}

.month-header h3 {
    color: var(--text-light);
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.pay-month-btn {
    background: white;
    color: var(--success-color);
    text-decoration: none;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid var(--success-color);
    transition: all 0.2s;
}

.pay-month-btn:hover {
    background: var(--success-color);
    color: white;
}

/* --- DEBT ITEMS (Transactions) --- */
.debt-card {
    padding: 12px 15px;
    margin-bottom: 8px;
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 10px;
    border-left: 4px solid var(--danger-color);
    transition: transform 0.2s, box-shadow 0.2s;
    border-radius: 12px;
    background: white;
    /* Ensure white bg */
}

.debt-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
}

.debt-card.paid {
    border-left-color: #BDBDBD;
    opacity: 0.6;
    background: rgba(255, 255, 255, 0.5);
}

.debt-card.payment-item {
    border-left-color: var(--success-color);
    background: rgba(232, 245, 233, 0.95);
}

.debt-info {
    grid-column: 1;
}

.debt-desc {
    font-weight: 600;
    font-size: 16px;
    color: var(--text-color);
    margin-bottom: 2px !important;
    text-transform: uppercase;
}

.debt-date {
    font-size: 11px;
    color: var(--text-light);
}

.debt-amount {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-color);
    text-align: right;
}

.debt-card.payment-item .debt-amount {
    color: var(--success-color);
}

.debt-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pay-btn {
    background: var(--success-color);
    color: white;
    padding: 6px 12px;
    border-radius: 15px;
    text-decoration: none;
    font-size: 12px;
    font-weight: 700;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    text-transform: uppercase;
    display: inline-block;
}

.paid-badge {
    color: #BDBDBD;
    font-weight: 700;
    font-size: 11px;
    border: 1px solid #BDBDBD;
    padding: 2px 6px;
    border-radius: 8px;
    text-transform: uppercase;
}

.delete-icon {
    color: #CFD8DC;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.2s;
}

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

/* --- MODALS --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    margin: auto;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    width: 90%;
    max-width: 350px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    animation: zoomIn 0.2s ease;
    text-align: center;
}

.modal-content h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 22px;
}

.modal-content label {
    display: block;
    text-align: left;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 14px;
}

.modal-content input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

@keyframes zoomIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.close {
    color: #aaa;
    float: right;
    font-size: 24px;
    color: var(--text-light);
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.pay-month-btn {
    background: white;
    color: var(--success-color);
    text-decoration: none;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid var(--success-color);
    transition: all 0.2s;
}

.pay-month-btn:hover {
    background: var(--success-color);
    color: white;
}

/* --- DEBT ITEMS (Transactions) --- */
.debt-card {
    padding: 12px 15px;
    margin-bottom: 8px;
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 10px;
    border-left: 4px solid var(--danger-color);
    transition: transform 0.2s, box-shadow 0.2s;
    border-radius: 12px;
    background: white;
    /* Ensure white bg */
}

.debt-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
}

.debt-card.paid {
    border-left-color: #BDBDBD;
    opacity: 0.6;
    background: rgba(255, 255, 255, 0.5);
}

.debt-card.payment-item {
    border-left-color: var(--success-color);
    background: rgba(232, 245, 233, 0.95);
}

.debt-info {
    grid-column: 1;
}

.debt-desc {
    font-weight: 600;
    font-size: 16px;
    color: var(--text-color);
    margin-bottom: 2px !important;
    text-transform: uppercase;
}

.debt-date {
    font-size: 11px;
    color: var(--text-light);
}

.debt-amount {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-color);
    text-align: right;
}

.debt-card.payment-item .debt-amount {
    color: var(--success-color);
}

.debt-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pay-btn {
    background: var(--success-color);
    color: white;
    padding: 6px 12px;
    border-radius: 15px;
    text-decoration: none;
    font-size: 12px;
    font-weight: 700;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    text-transform: uppercase;
    display: inline-block;
}

.paid-badge {
    color: #BDBDBD;
    font-weight: 700;
    font-size: 11px;
    border: 1px solid #BDBDBD;
    padding: 2px 6px;
    border-radius: 8px;
    text-transform: uppercase;
}

.delete-icon {
    color: #CFD8DC;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.2s;
}

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

/* --- MODALS --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    margin: auto;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    width: 90%;
    max-width: 350px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    animation: zoomIn 0.2s ease;
    text-align: center;
}

.modal-content h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 22px;
}

.modal-content label {
    display: block;
    text-align: left;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 14px;
}

.modal-content input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

@keyframes zoomIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.close {
    color: #aaa;
    float: right;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    line-height: 20px;
}

.close:hover {
    color: black;
}

/* WhatsApp Button */
.whatsapp-btn {
    display: inline-block;
    background-color: #25D366;
    color: white;
    padding: 10px 15px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 600;
    margin-top: 10px;
    margin-bottom: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: background-color 0.2s;
}

.whatsapp-btn:hover {
    background-color: #128C7E;
}