/* ============================================================
   UI Design System — Core
   Tokens, typography, base resets, dark mode
   v1.0 | lib.myoasishealth.ca/v1/css/ui-core.css
   ============================================================ */

/* --------------------------------------------------------
   Light mode tokens (default)
   -------------------------------------------------------- */
:root {
    /* Module primary — overridden by each theme file */
    --ui-primary:         #2563eb;
    --ui-primary-light:   #dbeafe;
    --ui-primary-hover:   #1d4ed8;

    /* Semantic system colors */
    --ui-success:         #198754;
    --ui-success-light:   #d1e7dd;
    --ui-warning:         #ffc107;
    --ui-warning-light:   #fff3cd;
    --ui-danger:          #dc3545;
    --ui-danger-light:    #f8d7da;
    --ui-info:            #0dcaf0;
    --ui-info-light:      #cff4fc;
    --ui-secondary:       #6c757d;

    /* Surfaces */
    --ui-body-bg:         #f8f9fa;
    --ui-body-text:       #212529;
    --ui-surface-1:       #f8f9fa;
    --ui-surface-2:       #ffffff;
    --ui-surface-3:       #f1f3f5;
    --ui-border:          #dee2e6;
    --ui-text-muted:      #6c757d;

    /* Sidebar — dark in light mode, darker in dark mode */
    --ui-sidebar-bg:         #1e293b;
    --ui-sidebar-text:       #94a3b8;
    --ui-sidebar-active:     #ffffff;
    --ui-sidebar-active-bg:  var(--ui-primary);
    --ui-sidebar-hover-bg:   rgba(255, 255, 255, 0.07);

    /* Header */
    --ui-header-bg:          #ffffff;
    --ui-header-border:      #e2e8f0;
    --ui-header-text:        #212529;

    /* Typography */
    --ui-font-family:     'Inter', 'Segoe UI', Arial, sans-serif;
    --ui-text-xs:         0.75rem;
    --ui-text-sm:         0.875rem;
    --ui-text-base:       1rem;
    --ui-text-lg:         1.125rem;
    --ui-h6:              1rem;
    --ui-h5:              1.125rem;
    --ui-h4:              1.25rem;
    --ui-h3:              1.5rem;
    --ui-h2:              1.875rem;
    --ui-h1:              2.25rem;

    /* Border radius */
    --ui-radius-sm:       0.25rem;
    --ui-radius-md:       0.375rem;
    --ui-radius-lg:       0.5rem;
    --ui-radius-pill:     50rem;

    /* Shadows */
    --ui-shadow-sm:       0 1px 2px rgba(0, 0, 0, 0.075);
    --ui-shadow-md:       0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --ui-shadow-lg:       0 1rem 3rem rgba(0, 0, 0, 0.175);

    /* Spacing */
    --ui-spacing-xs:      0.25rem;
    --ui-spacing-sm:      0.5rem;
    --ui-spacing-md:      1rem;
    --ui-spacing-lg:      1.5rem;
    --ui-spacing-xl:      2rem;

    /* Layout dimensions */
    --ui-sidebar-width:            260px;
    --ui-sidebar-collapsed-width:  64px;
    --ui-header-height:            60px;
}

/* --------------------------------------------------------
   Dark mode — system preference
   Applies when no explicit [data-theme] is set
   -------------------------------------------------------- */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --ui-body-bg:          #0f172a;
        --ui-body-text:        #e2e8f0;
        --ui-surface-1:        #0f172a;
        --ui-surface-2:        #1e293b;
        --ui-surface-3:        #334155;
        --ui-border:           #334155;
        --ui-text-muted:       #94a3b8;

        --ui-primary-light:    rgba(37, 99, 235, 0.2);

        --ui-success-light:    rgba(25, 135, 84, 0.2);
        --ui-warning-light:    rgba(255, 193, 7, 0.15);
        --ui-danger-light:     rgba(220, 53, 69, 0.2);
        --ui-info-light:       rgba(13, 202, 240, 0.15);

        --ui-sidebar-bg:       #0a1628;
        --ui-sidebar-text:     #64748b;
        --ui-sidebar-active:   #e2e8f0;

        --ui-header-bg:        #1e293b;
        --ui-header-border:    #334155;
        --ui-header-text:      #e2e8f0;

        --ui-shadow-sm:        0 1px 2px rgba(0, 0, 0, 0.3);
        --ui-shadow-md:        0 0.5rem 1rem rgba(0, 0, 0, 0.4);
        --ui-shadow-lg:        0 1rem 3rem rgba(0, 0, 0, 0.5);
    }
}

/* --------------------------------------------------------
   Dark mode — explicit [data-theme="dark"]
   -------------------------------------------------------- */
[data-theme="dark"] {
    --ui-body-bg:          #0f172a;
    --ui-body-text:        #e2e8f0;
    --ui-surface-1:        #0f172a;
    --ui-surface-2:        #1e293b;
    --ui-surface-3:        #334155;
    --ui-border:           #334155;
    --ui-text-muted:       #94a3b8;

    --ui-primary-light:    rgba(37, 99, 235, 0.2);

    --ui-success-light:    rgba(25, 135, 84, 0.2);
    --ui-warning-light:    rgba(255, 193, 7, 0.15);
    --ui-danger-light:     rgba(220, 53, 69, 0.2);
    --ui-info-light:       rgba(13, 202, 240, 0.15);

    --ui-sidebar-bg:       #0a1628;
    --ui-sidebar-text:     #64748b;
    --ui-sidebar-active:   #e2e8f0;

    --ui-header-bg:        #1e293b;
    --ui-header-border:    #334155;
    --ui-header-text:      #e2e8f0;

    --ui-shadow-sm:        0 1px 2px rgba(0, 0, 0, 0.3);
    --ui-shadow-md:        0 0.5rem 1rem rgba(0, 0, 0, 0.4);
    --ui-shadow-lg:        0 1rem 3rem rgba(0, 0, 0, 0.5);
}

/* --------------------------------------------------------
   Bootstrap 5 variable bridge
   -------------------------------------------------------- */
:root {
    --bs-font-sans-serif:   var(--ui-font-family);
    --bs-body-font-family:  var(--ui-font-family);
    --bs-body-bg:           var(--ui-body-bg);
    --bs-body-color:        var(--ui-body-text);
    --bs-border-color:      var(--ui-border);
    --bs-border-radius:     var(--ui-radius-md);
    --bs-border-radius-sm:  var(--ui-radius-sm);
    --bs-border-radius-lg:  var(--ui-radius-lg);
    --bs-border-radius-pill: var(--ui-radius-pill);
}

/* --------------------------------------------------------
   Base resets
   -------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: var(--ui-font-family);
    font-size: var(--ui-text-base);
    color: var(--ui-body-text);
    background-color: var(--ui-body-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1 { font-size: var(--ui-h1); font-weight: 700; line-height: 1.2;  margin-bottom: var(--ui-spacing-sm); }
h2 { font-size: var(--ui-h2); font-weight: 700; line-height: 1.25; margin-bottom: var(--ui-spacing-sm); }
h3 { font-size: var(--ui-h3); font-weight: 600; line-height: 1.3;  margin-bottom: var(--ui-spacing-sm); }
h4 { font-size: var(--ui-h4); font-weight: 600; line-height: 1.3;  margin-bottom: var(--ui-spacing-xs); }
h5 { font-size: var(--ui-h5); font-weight: 600; line-height: 1.3;  margin-bottom: var(--ui-spacing-xs); }
h6 { font-size: var(--ui-h6); font-weight: 600; line-height: 1.3;  margin-bottom: var(--ui-spacing-xs); }

a {
    color: var(--ui-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Accessibility — keyboard focus */
:focus-visible {
    outline: 2px solid var(--ui-primary);
    outline-offset: 2px;
    border-radius: var(--ui-radius-sm);
}

/* --------------------------------------------------------
   SVG icon base
   Icons reference the Tabler sprite via <use href="#icon-*">
   -------------------------------------------------------- */
.ui-icon {
    width:  1.25em;
    height: 1.25em;
    display: inline-block;
    vertical-align: -0.2em;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}

.ui-icon--xs  { width: 0.875em; height: 0.875em; }
.ui-icon--sm  { width: 1em;     height: 1em; }
.ui-icon--lg  { width: 1.5em;   height: 1.5em; }
.ui-icon--xl  { width: 2em;     height: 2em; }
.ui-icon--2xl { width: 2.5em;   height: 2.5em; }