/* base.css — Reset + CSS-Variablen + Theme-Tokens
 *
 * Themes werden via html.theme-light / html.theme-dark gesteuert (siehe js/theme.js).
 * Branding-Slots (Shell-overridable via Bridge in Phase 2.13) sind als Defaults definiert
 * und koennen ueberschrieben werden.
 */

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

:root {
    /* Light theme defaults */
    --shell-bg:           #ffffff;
    --shell-bg-elevated:  #f9fafb;
    --shell-fg:           #1a1a1a;
    --shell-fg-muted:     #6b7280;
    --shell-border:       #e5e7eb;
    --shell-border-strong: #c7cbd1;

    /* Branding-Slots (Shell-overridable spaeter) */
    --shell-primary:      #0067b3;
    --shell-primary-fg:   #ffffff;
    --shell-primary-hover: #00528f;
    --shell-accent:       #0084e8;

    --shell-header-bg:    var(--shell-primary);
    --shell-header-fg:    var(--shell-primary-fg);

    /* Status / Feedback */
    --shell-danger:       #dc2626;
    --shell-success:      #16a34a;
    --shell-warning:      #d97706;

    /* Geometrie */
    --shell-radius:       6px;
    --shell-radius-lg:    14px;
    --shell-spacing:      1rem;
    --shell-spacing-sm:   0.5rem;
    --shell-spacing-lg:   1.5rem;

    --shell-shadow:       0 4px 12px rgba(0,0,0,0.08);
    --shell-shadow-modal: 0 12px 32px rgba(0,0,0,0.18);

    /* Typografie */
    --shell-font:         -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --shell-font-mono:    ui-monospace, SFMono-Regular, 'Cascadia Code', Menlo, Consolas, monospace;
}

html.theme-dark {
    --shell-bg:           #1a1a1a;
    --shell-bg-elevated:  #262626;
    --shell-fg:           #f0f0f0;
    --shell-fg-muted:     #9ca3af;
    --shell-border:       #404040;
    --shell-border-strong: #525252;

    --shell-primary:      #1e88e5;
    --shell-primary-fg:   #ffffff;
    --shell-primary-hover: #1976d2;
    --shell-accent:       #42a5f5;

    --shell-header-bg:    #262626;
    --shell-header-fg:    var(--shell-fg);

    --shell-shadow:       0 4px 12px rgba(0,0,0,0.4);
    --shell-shadow-modal: 0 12px 32px rgba(0,0,0,0.6);
}

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--shell-font);
    font-size: 15px;
    line-height: 1.5;
    background: var(--shell-bg);
    color: var(--shell-fg);
    min-height: 100vh;
    height: 100vh;
    overflow: hidden;
}

body {
    display: flex;
    flex-direction: column;
}

a {
    color: var(--shell-primary);
    text-decoration: underline;
}

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

.app-header {
    flex: 0 0 auto;
    background: var(--shell-header-bg);
    color: var(--shell-header-fg);
    padding: 0.625rem var(--shell-spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--shell-spacing);
    min-height: 56px;
}

.app-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.header-actions:empty {
    display: none;
}

/* Sichtbarer Tastatur-Fokus. `:focus-visible` greift nur bei Tastatur-Fokus,
 * nicht beim Maus-Klick — gilt fuer Buttons, Links, die Dropzone, <summary>. */
:focus-visible {
    outline: 2px solid var(--shell-primary);
    outline-offset: 2px;
}

/* Auf der blauen Kopfleiste braucht der Fokus-Ring weissen Kontrast. */
.app-header :focus-visible {
    outline-color: #ffffff;
}

.app-main {
    flex: 1 1 auto;
    overflow: auto;
    padding: var(--shell-spacing-lg);
    display: flex;
    flex-direction: column;
}

/* Preview-Screen: app-main gibt Padding + Scroll komplett ab, damit der
 * CAD-iframe die volle Flaeche fuellt. Der Screen fuellt dann sauber per
 * Flexbox (kein Negative-Margin-Hack — der liess die rechte Kante 3rem
 * vor dem Viewport-Rand stehen = weisser Balken).                          */
.app-main:has(> .screen-preview) {
    overflow: hidden;
    padding: 0;
}

.error-state {
    max-width: 600px;
    margin: 4rem auto;
    padding: var(--shell-spacing-lg);
    background: var(--shell-bg-elevated);
    border: 1px solid var(--shell-border);
    border-radius: var(--shell-radius-lg);
}

.error-state h2 {
    margin-top: 0;
    color: var(--shell-danger);
}

.error-state pre {
    background: var(--shell-bg);
    padding: var(--shell-spacing);
    border-radius: var(--shell-radius);
    overflow-x: auto;
    font-family: var(--shell-font-mono);
    font-size: 0.875rem;
}

/* Bridge-Required: spezieller Hinweis, kein Fehlerstatus (h2 in Standard-Farbe,
 * dezente Diagnose-`<pre>`). Nutzt den `.error-state`-Container fuer das
 * Layout, ueberschreibt aber die Roterklaerung-Optik.                       */
.bridge-required-screen h2 {
    color: var(--shell-fg);
}

.bridge-required-screen .muted {
    color: var(--shell-fg-muted, #6b7280);
    font-size: 0.9rem;
}

.bridge-required-screen .bridge-required-reason {
    margin-top: 1.25rem;
    background: transparent;
    border: 1px dashed var(--shell-border);
    color: var(--shell-fg-muted, #6b7280);
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
}