/* Root theme variables */
:root {
    --color-bg: #f8f9fb;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-border-strong: #cbd5e1;
    --color-text: #1e293b;
    --color-text-soft: #475569;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-accent-rgb: 37, 99, 235;
    --color-primary: #0d9488;
    --color-primary-hover: #0f766e;
    --color-danger: #dc2626;
    --color-warning: #d97706;
    --color-success: #059669;
    --radius-xs: 3px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 10px -2px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.06);
    --transition: 120ms cubic-bezier(.4, 0, .2, 1);
    --font-stack: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', Arial, sans-serif;
    --header-height: 60px;
    --navbar-width: 150px;
}

/* App Shell Layout */
.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.header-content {
    height: 100%;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-logo {
    width: 40px;
    height: 40px;
}

.main-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.burger-button {
    display: none;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--color-text);
    line-height: 1;
    transition: background var(--transition), border-color var(--transition);
}

.burger-button:hover {
    background: var(--color-bg);
    border-color: var(--color-border-strong);
}

/* Navbar */
.app-navbar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--navbar-width);
    height: calc(100vh - var(--header-height));
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: 1rem;
    overflow-y: auto;
    transition: transform var(--transition);
    z-index: 90;
}

.app-navbar .nav-link {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--color-text-soft);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition);
    font-weight: 500;
}

.app-navbar .nav-link:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.app-navbar .nav-link.active {
    background: rgba(var(--color-accent-rgb), 0.1);
    color: var(--color-accent);
}

/* Main Content */
.app-main {
    margin-top: var(--header-height);
    margin-left: var(--navbar-width);
    padding: 1rem;
    min-height: calc(100vh - var(--header-height));
    transition: margin-left var(--transition);
}

/* Responsive - Mobile */
@media (max-width: 768px) {
    .burger-button {
        display: block;
    }

    .app-navbar.collapsed-mobile {
        transform: translateX(-100%);
    }

    .app-main {
        margin-left: 0;
    }
}

body,
.dash-spa-layout,
.page-container {
    font-family: var(--font-stack);
    background: var(--color-bg);
    color: var(--color-text);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

.page-container {
    padding: clamp(0.75rem, 2vw, 1.75rem);
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    box-sizing: border-box;
}

/* Typography */
.page-title,
.section-title {
    margin: 0 0 .75rem;
    font-weight: 600;
    letter-spacing: .5px;
}

.page-title {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
}

.section-title {
    font-size: clamp(1.2rem, 2.2vw, 1.6rem);
}

.status-msg {
    font-size: .875rem;
    margin-top: .5rem;
    min-height: 1.25rem;
}

.file-name {
    font-size: .8rem;
    color: var(--color-warning);
    margin-top: .25rem;
}

/* Cards */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem 1.25rem;
    box-shadow: var(--shadow-sm);
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.section-upload {
    gap: .75rem;
}

/* Grid Layout */
.layout-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: 1fr;
}

@media (min-width: 1100px) {
    .layout-grid {
        grid-template-columns: minmax(0, 420px) 1fr;
        align-items: start;
    }

    .chart-card {
        min-height: 540px;
    }
}

/* Form */
.form-row {
    display: flex;
    flex-wrap: nowrap;
    gap: .75rem;
    align-items: flex-end;
}

.form-row.wrap {
    flex-wrap: wrap;
}

.responsive-row {
    flex-wrap: wrap;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: .35rem;
    min-width: 120px;
}

.form-field.grow {
    flex: 1 1 240px;
}

.form-label {
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    font-weight: 600;
    color: var(--color-text-soft);
}

.dynamic-inputs {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
}

/* Dropdown sizing overrides (Dash core components) */
.dropdown.sm .Select-control,
.dropdown.sm .Select__control {
    min-width: 150px;
}

.dropdown.md .Select-control,
.dropdown.md .Select__control {
    min-width: 220px;
}

.dropdown.filter .Select-control,
.dropdown.filter .Select__control {
    min-width: 180px;
}

/* Upload & filters */
.upload-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .75rem;
}

.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-sm);
    padding: .5rem .75rem;
    transition: border-color var(--transition), background var(--transition);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--color-accent);
    background: rgba(var(--color-accent-rgb), .04);
}

.filter-container {
    width: 100%;
}

.filter-grid {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin-top: .5rem;
}

.filter-field {
    display: flex;
    flex-direction: column;
    gap: .35rem;
    padding: .5rem .65rem .75rem;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.filter-field:hover {
    border-color: var(--color-border-strong);
}

/* Buttons */
.btn {
    font-family: inherit;
    font-size: .875rem;
    font-weight: 600;
    line-height: 1.2;
    border-radius: var(--radius-sm);
    padding: .55rem .9rem .6rem;
    cursor: pointer;
    border: 1px solid transparent;
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    position: relative;
    transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

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

.btn.accent {
    background: var(--color-accent);
    color: #fff;
}

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

.btn.outline {
    background: transparent;
    border-color: var(--color-border-strong);
    color: var(--color-text-soft);
}

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

.btn.subtle {
    background: rgba(var(--color-accent-rgb), .07);
    color: var(--color-accent);
    border: 1px solid rgba(var(--color-accent-rgb), .2);
}

.btn.subtle:hover {
    background: rgba(var(--color-accent-rgb), .15);
}

/* Chart */
.chart {
    width: 100%;
    height: 100%;
}

.chart-card {
    padding: .75rem 1rem;
}

/* Utilities */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    border: 0;
}

/* Dark Mode (optional) */
body.dark,
[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-border: #334155;
    --color-border-strong: #475569;
    --color-text: #f1f5f9;
    --color-text-soft: #cbd5e1;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-primary: #14b8a6;
    --color-primary-hover: #0d9488;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 10px -2px rgba(0, 0, 0, 0.55), 0 2px 4px rgba(0, 0, 0, 0.4);
}

/* Fine-tuning for small screens */
@media (max-width: 680px) {

    .form-row,
    .responsive-row {
        flex-direction: column;
        align-items: stretch;
    }

    .form-field,
    .form-field.grow {
        width: 100%;
    }

    .upload-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-grid {
        flex-direction: column;
    }
}

/* Keep original title colors with Mantine integration if used */
.main-title {
    color: var(--color-text);
}

[data-mantine-color-scheme="dark"] .main-title {
    color: var(--color-text);
}