:root {
    --bg: #F7F7F8;
    --surface: #FFFFFF;
    --border: #E3E4E8;
    --text: #1A1B1E;
    --text-secondary: #6B6E76;
    --accent: #3653D6;
    --success: #2F9E64;
    --alert: #D6483F;
    --radius: 9px;
}

[data-theme="dark"] {
    --bg: #14161A;
    --surface: #1D1F25;
    --border: #2C2F37;
    --text: #EDEEF1;
    --text-secondary: #9599A3;
    --accent: #6C8CFF;
    --success: #4CBE86;
    --alert: #E5695F;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 16px 64px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    position: relative;
    gap: 12px;
}

.topbar h1 {
    font-size: 18px;
    font-weight: 700;
    margin: 0;
    white-space: nowrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    color: var(--text);
    cursor: pointer;
    flex-shrink: 0;
}

@media (max-width: 640px) {
    .topbar h1 {
        font-size: 15px;
    }

    .brand-logo {
        width: 24px;
        height: 24px;
    }

    .menu-toggle {
        display: inline-flex;
    }

    .topbar-actions {
        display: none;
        position: absolute;
        top: 100%;
        right: 16px;
        left: 16px;
        flex-direction: column;
        align-items: stretch;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 8px;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        z-index: 40;
    }

    .topbar-actions.is-open {
        display: flex;
    }

    .topbar-actions .btn {
        width: 100%;
        justify-content: flex-start;
    }
}

.brand-logo {
    border-radius: 6px;
    display: block;
}

.topbar-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    vertical-align: -3px;
}

.icon-sm {
    width: 14px;
    height: 14px;
    vertical-align: -2px;
}

.btn {
    gap: 6px;
}

.stat-value,
.month-chip,
.history-table td {
    font-variant-numeric: tabular-nums;
}

.login-brand {
    display: flex;
    justify-content: center;
    margin-bottom: 8px;
}

.login-brand img {
    border-radius: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0 32px;
}

@media (max-width: 720px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    animation: card-rise 0.35s ease both;
}

.stat-card:nth-child(2) { animation-delay: 0.05s; }
.stat-card:nth-child(3) { animation-delay: 0.1s; }
.stat-card:nth-child(4) { animation-delay: 0.15s; }

@keyframes card-rise {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
    .stat-card {
        animation: none;
    }
}

.stat-icon {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
}

.stat-icon svg {
    width: 18px;
    height: 18px;
}

.stat-icon-accent {
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    color: var(--accent);
}

.stat-icon-success {
    background: color-mix(in srgb, var(--success) 14%, transparent);
    color: var(--success);
}

.stat-icon-alert {
    background: color-mix(in srgb, var(--alert) 14%, transparent);
    color: var(--alert);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.stat-value-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stat-breakdown {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 6px;
}

.eye-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 4px;
    display: inline-flex;
    align-items: center;
}

.eye-toggle svg {
    width: 18px;
    height: 18px;
}

.search-bar {
    margin-bottom: 16px;
}

.search-bar input {
    margin-top: 0;
}

.tabs {
    display: flex;
    gap: 24px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.tab-btn {
    background: none;
    border: none;
    padding: 10px 2px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

.tab-btn.is-active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.panel-header {
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.sort-control {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sort-control label {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
    white-space: nowrap;
}

.sort-control select {
    margin: 0;
    width: auto;
    padding: 7px 10px;
    font-size: 13px;
}

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

.client-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.client-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    gap: 12px;
    flex-wrap: wrap;
}

.client-main {
    display: flex;
    align-items: center;
    gap: 10px;
}

.expand-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 12px;
    padding: 4px;
}

.expand-toggle.is-open .chevron {
    display: inline-block;
    transform: rotate(90deg);
}

.client-name {
    font-weight: 600;
    font-size: 15px;
}

.client-value {
    font-size: 13px;
    color: var(--text-secondary);
}

.client-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
}

.badge-success {
    background: color-mix(in srgb, var(--success) 15%, transparent);
    color: var(--success);
}

.badge-muted {
    background: color-mix(in srgb, var(--text-secondary) 15%, transparent);
    color: var(--text-secondary);
}

.badge-alert {
    background: color-mix(in srgb, var(--alert) 15%, transparent);
    color: var(--alert);
}

.btn {
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px;
    padding: 8px 14px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn:hover {
    border-color: var(--accent);
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #FFFFFF;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-block {
    width: 100%;
}

.btn-icon {
    padding: 8px 12px;
}

.btn-danger {
    color: var(--alert);
}

.btn-pay {
    min-width: 88px;
}

.btn-pay.is-paid {
    background: color-mix(in srgb, var(--success) 12%, transparent);
    border-color: var(--success);
    color: var(--success);
}

.btn-pay.is-pending {
    background: color-mix(in srgb, var(--alert) 12%, transparent);
    border-color: var(--alert);
    color: var(--alert);
}

.btn-whatsapp {
    border-color: var(--success);
    color: var(--success);
}

.client-details {
    border-top: 1px solid var(--border);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.months-history {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.month-chip {
    font-size: 12px;
    font-weight: 600;
    border-radius: 999px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
}

.month-chip.is-paid {
    background: color-mix(in srgb, var(--success) 12%, transparent);
    border-color: var(--success);
    color: var(--success);
}

.month-chip.is-pending {
    background: color-mix(in srgb, var(--alert) 12%, transparent);
    border-color: var(--alert);
    color: var(--alert);
}

.details-info {
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 13px;
}

.info-line strong {
    color: var(--text-secondary);
    font-weight: 600;
}

.chart-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 24px;
}

.chart-title {
    font-size: 15px;
    font-weight: 700;
    margin: 0 0 16px;
}

.chart-scroll {
    overflow-x: auto;
}

.revenue-chart {
    width: 100%;
    min-width: 480px;
    height: auto;
    display: block;
}

.chart-bar {
    fill: var(--accent);
}

.bar-group:hover .chart-bar {
    opacity: 0.85;
}

.chart-label {
    font-size: 11px;
    fill: var(--text-secondary);
    font-family: inherit;
}

.history-table-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    overflow-x: auto;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.history-table th,
.history-table td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}

.history-table th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.history-table tbody tr:last-child td {
    border-bottom: none;
}

.empty-state {
    color: var(--text-secondary);
    font-size: 14px;
    padding: 24px 0;
    text-align: center;
}

/* Login */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    width: 100%;
    max-width: 360px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.login-card h1 {
    font-size: 18px;
    margin: 0 0 12px;
}

.login-error {
    color: var(--alert);
    font-size: 13px;
    margin: 0 0 4px;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    flex-direction: row;
    margin: 6px 0;
}

/* Forms */
label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    display: block;
    margin-top: 4px;
}

input[type="text"],
input[type="password"],
input[type="url"],
input[type="number"],
input[type="month"],
select,
textarea {
    width: 100%;
    font-family: inherit;
    font-size: 14px;
    padding: 9px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    margin-top: 4px;
}

textarea {
    resize: vertical;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    z-index: 50;
}

.modal-overlay[hidden] {
    display: none;
}

.modal-card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 24px;
    width: 100%;
    max-width: 440px;
    max-height: 90vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.modal-card h2 {
    margin: 0 0 8px;
    font-size: 16px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}