/* ==========================================
   PROFESSIONAL WATER BILLING SYSTEM STYLES
   ========================================== */

:root {
    --primary-color: #005eb8;
    --primary-strong: #00458a;
    --primary-dark: #00356d;
    --primary-light: #eaf2ff;
    --secondary-color: #0ea5c6;
    --success-color: #15803d;
    --danger-color: #c2410c;
    --warning-color: #d97706;
    --neutral-bg: #f4f7fb;
    --surface: #ffffff;
    --surface-alt: #f8fbff;
    --neutral-border: #d8e0ea;
    --text-primary: #102033;
    --text-secondary: #5f6b7a;
    --shadow-sm: 0 2px 10px rgba(16, 32, 51, 0.08);
    --shadow-md: 0 8px 24px rgba(16, 32, 51, 0.12);
    --shadow-lg: 0 18px 36px rgba(16, 32, 51, 0.16);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition-fast: 160ms ease;
    --transition-normal: 220ms ease;
}

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

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background:
        radial-gradient(circle at top left, rgba(0, 94, 184, 0.08), transparent 32%),
        radial-gradient(circle at top right, rgba(14, 165, 198, 0.08), transparent 28%),
        var(--neutral-bg);
}

::selection {
    background: rgba(0, 94, 184, 0.16);
    color: var(--text-primary);
}

button,
input,
select,
textarea {
    font: inherit;
}

:focus {
    outline: none;
}

:focus-visible {
    outline: 3px solid rgba(0, 94, 184, 0.28);
    outline-offset: 2px;
}

/* ==================== TYPOGRAPHY ==================== */

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

h4 {
    font-size: 1.25rem;
    margin-bottom: 0.875rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
    color: var(--primary-strong);
}

/* ==================== LAYOUT UTILS ==================== */

.page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 0;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.page-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
}

.page-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.card {
    background: var(--surface);
    border: 1px solid rgba(16, 32, 51, 0.06);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 1rem;
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.table-responsive table {
    width: 100%;
    min-width: 640px;
}

/* ==================== BUTTONS ==================== */

.btn,
button,
input[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-fast),
        background-color var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast),
        opacity var(--transition-fast);
    text-decoration: none;
    gap: 0.5rem;
    line-height: 1.1;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.btn-primary,
.btn:not(.btn-secondary):not(.btn-danger):not(.btn-warning):not(.btn-outline) {
    background: linear-gradient(180deg, #0068d1 0%, var(--primary-color) 100%);
    color: white;
}

.btn-primary:hover,
.btn:not(.btn-secondary):not(.btn-danger):not(.btn-warning):not(.btn-outline):hover {
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--primary-strong) 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-secondary {
    background: linear-gradient(180deg, #14b8d7 0%, var(--secondary-color) 100%);
    color: white;
}

.btn-secondary:hover {
    background: linear-gradient(180deg, var(--secondary-color) 0%, #0b91ab 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(180deg, #1f9d4a 0%, var(--success-color) 100%);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(180deg, var(--success-color) 0%, #0f6b31 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(180deg, #e76f2e 0%, var(--danger-color) 100%);
    color: white;
}

.btn-danger:hover {
    background: linear-gradient(180deg, var(--danger-color) 0%, #9a3412 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-warning {
    background: linear-gradient(180deg, #f59e0b 0%, var(--warning-color) 100%);
    color: white;
}

.btn-warning:hover {
    background: linear-gradient(180deg, var(--warning-color) 0%, #b45309 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 1.5px solid var(--primary-color);
    color: var(--primary-color);
    box-shadow: none;
}

.btn-outline:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-strong);
    color: var(--primary-strong);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none;
}

/* ==================== FORMS ==================== */

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="tel"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--neutral-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--surface);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 94, 184, 0.12);
    background-color: #fbfdff;
}

input:disabled,
textarea:disabled,
select:disabled {
    background-color: #f5f5f5;
    color: var(--text-secondary);
    cursor: not-allowed;
}

textarea {
    resize: vertical;
    min-height: 120px;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-row.full {
    grid-template-columns: 1fr;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ==================== CARDS ==================== */

.card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(16, 32, 51, 0.06);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    border-bottom: 2px solid var(--neutral-bg);
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
}

.card-header h3 {
    margin: 0;
    color: var(--primary-color);
}

.card-body {
    padding: 0;
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.table-responsive table {
    width: 100%;
    min-width: 640px;
}

/* ==================== TABLES ==================== */

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    background: var(--surface);
    border-radius: var(--radius-md);
    overflow: hidden;
}

th {
    background: linear-gradient(180deg, #0564c6 0%, var(--primary-color) 100%);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--neutral-border);
}

tr:hover {
    background-color: rgba(0, 94, 184, 0.05);
}

tr:last-child td {
    border-bottom: none;
}

/* ==================== HEADER & NAVIGATION ==================== */

.header {
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(16, 32, 51, 0.08);
    padding: 1rem 2rem;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    margin: 0;
    font-size: 1.75rem;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.nav a:hover,
.nav a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* ==================== CONTAINERS ==================== */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.container-fluid {
    max-width: 100%;
    padding: 2rem;
}

/* ==================== GRID ==================== */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

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

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

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
    .grid-4,
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .grid,
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ==================== STAT CARDS ==================== */

.stat-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s ease;
    border-left: 4px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: "";
    position: absolute;
    inset: auto -20% -35% auto;
    width: 9rem;
    height: 9rem;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 94, 184, 0.08) 0%, rgba(0, 94, 184, 0) 70%);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card.success {
    border-left-color: var(--success-color);
}

.stat-card.danger {
    border-left-color: var(--danger-color);
}

.stat-card.warning {
    border-left-color: var(--warning-color);
}

.stat-label {
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.09em;
    margin-bottom: 0.6rem;
    font-weight: 700;
}

.stat-card h4 {
    color: var(--text-secondary);
    margin: 0 0 1.5rem 0;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card .number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.stat-card.success .number {
    color: var(--success-color);
}

.stat-card.danger .number {
    color: var(--danger-color);
}

.stat-card.warning .number {
    color: var(--warning-color);
}

/* ==================== ALERTS ==================== */

.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-success {
    background-color: #d4edda;
    border-left-color: var(--success-color);
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    border-left-color: var(--danger-color);
    color: #721c24;
}

.alert-warning {
    background-color: #fff3cd;
    border-left-color: var(--warning-color);
    color: #856404;
}

.alert-info {
    background-color: #d1ecf1;
    border-left-color: var(--secondary-color);
    color: #0c5460;
}

/* ==================== FOOTER ==================== */

footer {
    background: linear-gradient(180deg, #0f1d2d 0%, var(--text-primary) 100%);
    color: white;
    padding: 2rem;
    text-align: center;
    margin-top: 4rem;
    border-top: 1px solid var(--neutral-border);
}

footer p {
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
}

/* ==================== UTILITIES ==================== */

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-muted {
    color: var(--text-secondary);
}

.text-primary {
    color: var(--primary-color);
}

.text-success {
    color: var(--success-color);
}

.text-danger {
    color: var(--danger-color);
}

.bg-light {
    background-color: var(--primary-light);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

/* ==================== RESPONSIVE ==================== */

@media (max-width: 768px) {
    body {
        font-size: 13px;
    }

    .page {
        padding: 1.25rem 0.75rem;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .page-actions {
        width: 100%;
        flex-direction: column;
        gap: 0.5rem;
    }

    .page-actions .btn {
        width: 100%;
    }

    .btn,
    button,
    input[type="submit"] {
        width: 100%;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .container {
        padding: 1rem;
    }

    .header {
        padding: 1rem;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .nav {
        flex-wrap: wrap;
        gap: 1rem;
        justify-content: center;
    }

    .card {
        padding: 1.5rem;
    }

    table {
        font-size: 0.85rem;
    }

    th, td {
        padding: 0.75rem;
    }
}