* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    padding: 0;

    font-family:
        Arial,
        Helvetica,
        sans-serif;

    background: #f3f4f6;
    color: #1f2937;

    line-height: 1.5;
}

a {
    color: #2563eb;
}

hr {
    border: 0;
    border-top: 1px solid #e5e7eb;

    margin: 25px 0;
}


/* =========================================
   CONTAINER
========================================= */

.container {
    min-height: 100vh;

    display: flex;
    justify-content: center;
    align-items: center;

    padding: 25px;
}


/* =========================================
   CARD
========================================= */

.card {
    width: 100%;
    max-width: 500px;

    background: #ffffff;

    padding: 35px;

    border-radius: 15px;

    box-shadow:
        0 10px 30px rgba(0, 0, 0, 0.08);
}

.card.wide {
    max-width: 1100px;
}


/* =========================================
   HEADINGS
========================================= */

h1 {
    margin-top: 0;
    margin-bottom: 10px;

    font-size: 28px;
}

h2 {
    margin-top: 0;

    font-size: 22px;
}

h3 {
    font-size: 18px;
}


/* =========================================
   BUTTON
========================================= */

.button {
    display: block;

    width: 100%;

    text-align: center;

    text-decoration: none;

    background: #2563eb;

    color: #ffffff;

    padding: 13px 18px;

    border: 0;

    border-radius: 8px;

    margin-top: 12px;

    font-size: 16px;

    cursor: pointer;
}

.button:hover {
    opacity: 0.9;
}

.button.secondary {
    background: #374151;
}


/* =========================================
   FORM
========================================= */

.form-group {
    text-align: left;

    margin-bottom: 18px;
}

.form-group label {
    display: block;

    margin-bottom: 7px;

    font-weight: bold;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;

    padding: 12px;

    border: 1px solid #d1d5db;

    border-radius: 8px;

    font-family: inherit;

    font-size: 16px;

    background: #ffffff;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;

    border-color: #2563eb;

    box-shadow:
        0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-group small {
    display: block;

    margin-top: 5px;

    color: #6b7280;
}


/* =========================================
   STATUS
========================================= */

.status {
    background: #dcfce7;

    color: #166534;

    padding: 12px;

    border-radius: 8px;

    margin: 20px 0;
}

.error {
    background: #fee2e2;

    color: #991b1b;

    padding: 12px;

    border-radius: 8px;

    margin: 20px 0;
}

.success-status {
    background: #dcfce7;

    color: #166534;
}

.warning-status {
    background: #fef3c7;

    color: #92400e;
}

.danger-status {
    background: #fee2e2;

    color: #991b1b;
}

.status-large {
    padding: 14px;

    border-radius: 8px;

    text-align: center;

    font-weight: bold;

    margin: 15px 0;
}


/* =========================================
   TABLE
========================================= */

.table-wrapper {
    width: 100%;

    overflow-x: auto;

    margin-top: 20px;
}

table {
    width: 100%;

    border-collapse: collapse;

    background: #ffffff;
}

th,
td {
    border-bottom: 1px solid #e5e7eb;

    padding: 12px;

    text-align: left;

    white-space: nowrap;
}

th {
    background: #f3f4f6;

    font-weight: bold;
}

tr:hover {
    background: #f9fafb;
}


/* =========================================
   DASHBOARD
========================================= */

.dashboard-header {
    display: flex;

    justify-content: space-between;

    align-items: flex-start;

    gap: 20px;
}

.logout-link {
    color: #dc2626;

    text-decoration: none;

    font-weight: bold;
}


/* =========================================
   BILL CARD
========================================= */

.bill-card {
    background: #f9fafb;

    border: 1px solid #e5e7eb;

    border-radius: 12px;

    padding: 25px;

    margin-top: 20px;
}

.bill-card h2 {
    margin-top: 0;
}

.bill-year {
    color: #6b7280;
}

.bill-grid {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 15px;

    margin: 25px 0;
}

.bill-item {
    background: #ffffff;

    padding: 18px;

    border-radius: 10px;

    border: 1px solid #e5e7eb;
}

.bill-item span {
    display: block;

    color: #6b7280;

    font-size: 14px;

    margin-bottom: 8px;
}

.bill-item strong {
    font-size: 20px;
}


/* =========================================
   INFO BOX
========================================= */

.info-box {
    background: #f3f4f6;

    padding: 15px;

    border-radius: 8px;

    margin-bottom: 20px;
}


/* =========================================
   MOBILE
========================================= */

@media (max-width: 700px) {

    .container {
        padding: 15px;
    }

    .card {
        padding: 25px 20px;
    }

    h1 {
        font-size: 24px;
    }

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

    .dashboard-header {
        flex-direction: column;
    }

}