/* ── Reset & Base ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #f4f5f7;
    --color-surface: #ffffff;
    --color-sidebar: #1e2a3a;
    --color-sidebar-hover: #263548;
    --color-sidebar-active: #2d4a6f;
    --color-primary: #3b6fa0;
    --color-primary-hover: #2e5a84;
    --color-text: #2c3e50;
    --color-text-muted: #6c7a89;
    --color-text-light: #95a5b6;
    --color-border: #dce1e8;
    --color-error: #c0392b;
    --color-error-bg: #fdf0ef;
    --color-success: #27864a;
    --color-success-bg: #edf7f0;
    --color-badge-bg: #e8edf2;
    --color-badge-text: #4a6785;
    --sidebar-width: 240px;
    --header-height: 56px;
    --radius: 6px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.08);
}

html {
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    display: flex;
    min-height: 100vh;
}

/* ── Sidebar ── */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-sidebar);
    color: #cfd8e3;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    overflow-y: auto;
}

.sidebar-header {
    padding: 1.5rem 1.25rem 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-title {
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
    letter-spacing: 0.01em;
}

.sidebar-subtitle {
    font-size: 0.75rem;
    color: #8a9bb5;
    margin-top: 0.15rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.sidebar-nav {
    list-style: none;
    padding: 0.5rem 0;
    flex: 1;
}

.sidebar-nav li {
    margin: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.6rem 1.25rem;
    color: #a0b0c4;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 450;
    transition: background 0.15s, color 0.15s;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: var(--color-sidebar-hover);
    color: #e0e8f0;
}

.nav-link.active {
    background: var(--color-sidebar-active);
    color: #ffffff;
    border-left-color: var(--color-primary);
}

.nav-icon {
    font-size: 0.65rem;
    width: 1rem;
    text-align: center;
    opacity: 0.7;
}

.nav-divider {
    border-top: 1px solid rgba(255,255,255,0.06);
    margin: 0.5rem 1.25rem;
}

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-version {
    font-size: 0.7rem;
    color: #5a6d82;
}

/* ── Main Content ── */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-header {
    height: var(--header-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 50;
}

.page-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
}

.header-meta {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.page-body {
    padding: 1.75rem 2rem;
    flex: 1;
}

/* ── Stats Grid ── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem 1.25rem 1rem;
    box-shadow: var(--shadow-sm);
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.35rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
}

.stat-value-sm {
    font-size: 1.1rem;
    font-weight: 600;
}

.stat-detail {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-top: 0.25rem;
}

/* ── Cards ── */
.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.25rem;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.card-wide {
    grid-column: 1 / -1;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.card-header h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}

.card-badge {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.2rem 0.55rem;
    background: var(--color-badge-bg);
    color: var(--color-badge-text);
    border-radius: 3px;
    letter-spacing: 0.02em;
}

.card-body {
    padding: 1.25rem;
}

/* ── Tables ── */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table th {
    text-align: left;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    padding: 0.5rem 0.75rem;
    border-bottom: 2px solid var(--color-border);
}

.data-table td {
    padding: 0.55rem 0.75rem;
    border-bottom: 1px solid #eef0f4;
    color: var(--color-text);
}

.data-table tbody tr:hover {
    background: #f8f9fb;
}

.data-table-compact th,
.data-table-compact td {
    padding: 0.4rem 0.5rem;
}

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

.table-note {
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-top: 0.75rem;
    font-style: italic;
}

.table-container {
    overflow-x: auto;
    margin-top: 1rem;
}

/* ── Section Label ── */
.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin-bottom: 0.4rem;
}

/* ── Forms ── */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.3rem;
}

.label-hint {
    font-weight: 400;
    color: var(--color-text-light);
}

.form-select,
.form-input,
.form-textarea {
    width: 100%;
    padding: 0.5rem 0.65rem;
    font-size: 0.85rem;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: border-color 0.15s;
}

.form-select:focus,
.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(59, 111, 160, 0.12);
}

.form-select-sm {
    padding: 0.35rem 0.5rem;
    font-size: 0.8rem;
}

.form-textarea {
    resize: vertical;
    min-height: 4rem;
}

.form-divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 1rem 0;
}

.filter-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.filter-label {
    min-width: 6.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.filter-row .form-select {
    flex: 1;
}

.form-row-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-error {
    background: var(--color-error-bg);
    color: var(--color-error);
    padding: 0.6rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-bottom: 0.75rem;
    border: 1px solid rgba(192, 57, 43, 0.15);
}

.form-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    padding: 0.6rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-bottom: 0.75rem;
    border: 1px solid rgba(39, 134, 74, 0.15);
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 550;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.15s;
    text-decoration: none;
}

.btn:hover {
    background: #f0f2f5;
}

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

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

.btn-primary:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 0.3rem 0.7rem;
    font-size: 0.75rem;
}

.btn-link {
    background: none;
    border: none;
    color: var(--color-primary);
    padding: 0;
    font-size: 0.8rem;
    cursor: pointer;
    text-decoration: underline;
}

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

/* ── Chart ── */
.chart-container {
    position: relative;
    width: 100%;
    max-height: 340px;
}

/* ── Query Layout ── */
.query-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 1.25rem;
    align-items: start;
}

.query-form-card {
    position: sticky;
    top: calc(var(--header-height) + 1.75rem);
}

.query-results {
    min-width: 0;
}

/* ── Placeholder ── */
.placeholder-text {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* ── Login Page ── */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--color-sidebar);
}

.login-container {
    width: 100%;
    max-width: 380px;
    padding: 1rem;
}

.login-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.login-header {
    background: #1a2332;
    color: #ffffff;
    padding: 1.75rem 1.75rem 1.5rem;
    text-align: center;
}

.login-header h1 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.login-header p {
    font-size: 0.75rem;
    color: #8a9bb5;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 0.25rem;
}

.login-form {
    padding: 1.5rem 1.75rem;
}

.login-form .form-group {
    margin-bottom: 1rem;
}

.login-form .form-group label {
    font-size: 0.78rem;
}

.login-form input {
    width: 100%;
    padding: 0.55rem 0.65rem;
    font-size: 0.85rem;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text);
}

.login-form input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(59, 111, 160, 0.12);
}

.login-footer {
    padding: 1rem 1.75rem 1.25rem;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.login-footer p {
    font-size: 0.7rem;
    color: var(--color-text-light);
    line-height: 1.55;
}

/* ── Status badges ── */
.status-active {
    color: var(--color-success);
    font-weight: 500;
}

.status-expired {
    color: var(--color-text-light);
    font-weight: 500;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .content-grid {
        grid-template-columns: 1fr;
    }
    .query-layout {
        grid-template-columns: 1fr;
    }
    .query-form-card {
        position: static;
    }
    .form-row-2col {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    .main-content {
        margin-left: 0;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
}