/**
 * Layout - vetmed-wissensbilanz Dashboard
 *
 * Grid-System und Container-Definitionen.
 * Responsive Breakpoints für Desktop, Tablet, Mobile.
 */

/* ========================================
   RESET & BASE
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
    min-height: 100vh;
}

/* ========================================
   APP LAYOUT (CSS Grid)
   ======================================== */
.app {
    display: grid;
    grid-template-rows: var(--header-height) 1fr;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-areas:
        "header header"
        "sidebar main";
    min-height: 100vh;
}

/* Collapsed Sidebar State */
.app.sidebar-collapsed {
    grid-template-columns: var(--sidebar-width-collapsed) 1fr;
}

/* ========================================
   HEADER
   ======================================== */
.header {
    grid-area: header;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    text-decoration: none;
}

.header__logo-icon {
    width: 32px;
    height: 32px;
}

.header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* ========================================
   TOP NAVIGATION (Dashboard / Promptotyping / About)
   ======================================== */
.top-nav {
    display: flex;
    gap: var(--space-1);
    background: var(--color-bg-secondary);
    padding: var(--space-1);
    border-radius: var(--border-radius);
}

.top-nav__item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
    background: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
}

.top-nav__item:hover {
    color: var(--color-text);
    background: var(--color-bg);
}

.top-nav__item--active {
    color: var(--color-primary);
    background: var(--color-bg);
    box-shadow: var(--shadow-sm);
}

.top-nav__item svg {
    flex-shrink: 0;
}

.header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ========================================
   SIDEBAR (Filter Panel)
   ======================================== */
.sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    padding: var(--space-4);
}

.sidebar__section {
    margin-bottom: var(--space-6);
}

.sidebar__section-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3);
}

.sidebar__footer {
    margin-top: auto;
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border);
}

/* ========================================
   MAIN CONTENT
   ======================================== */
.main {
    grid-area: main;
    display: flex;
    flex-direction: column;
    padding: var(--space-6);
    overflow-y: auto;
}

.main__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
}

.main__title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
}

.main__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

/* ========================================
   CARD COMPONENT
   ======================================== */
.card {
    background: var(--color-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border-light);
}

.card__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.card__body {
    padding: var(--space-5);
}

.card__footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border-light);
    background: var(--color-bg-secondary);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

/* ========================================
   TABS (Chart / Tabelle / Bericht)
   ======================================== */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-4);
}

.tabs__tab {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
}

.tabs__tab:hover {
    color: var(--color-text);
}

.tabs__tab--active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tabs__panel {
    display: none;
}

.tabs__panel--active {
    display: block;
}

/* Tabs mit Icons */
.tabs__tab {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.tabs__tab svg {
    flex-shrink: 0;
}

/* ========================================
   PAGE SYSTEM (Dashboard / Promptotyping / About)
   ======================================== */
.page {
    display: none;
    flex: 1;
    flex-direction: column;
}

.page--active {
    display: flex;
}

/* Dashboard Card - volle Höhe nutzen */
.dashboard-card {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.dashboard-card .card__body {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.dashboard-card .tabs__panel--active {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ========================================
   ABOUT PAGE
   ======================================== */
.about-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-6);
}

.about-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.about-header h1 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
}

.about-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
}

.about-section {
    margin-bottom: var(--space-6);
    padding: var(--space-5);
    background: var(--color-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border-light);
}

.about-section h2 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-3);
    color: var(--color-primary);
}

.about-section p {
    margin-bottom: var(--space-2);
    line-height: 1.6;
}

.about-list {
    list-style: none;
    padding: 0;
}

.about-list li {
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.about-list li:last-child {
    border-bottom: none;
}

.about-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-4);
}

/* Build Info Table */
.build-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.build-info__row {
    display: flex;
    justify-content: space-between;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.build-info__row:last-child {
    border-bottom: none;
}

.build-info__label {
    color: var(--color-text-muted);
    font-weight: var(--font-weight-medium);
}

.build-info__value {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
}

/* ========================================
   STATS BAR (F4: Filter Feedback)
   ======================================== */
.stats-bar {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
}

.stats-bar__item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.stats-bar__label {
    color: var(--color-text-muted);
}

.stats-bar__value {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.stats-bar__value--positive {
    color: var(--color-success);
}

.stats-bar__value--negative {
    color: var(--color-danger);
}

/* ========================================
   RESPONSIVE: TABLET (< 1024px)
   ======================================== */
@media (max-width: 1023px) {
    .app {
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "main";
    }

    .sidebar {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: var(--sidebar-width);
        height: calc(100vh - var(--header-height));
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        z-index: var(--z-fixed);
    }

    .sidebar.is-open {
        transform: translateX(0);
    }

    .sidebar-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        top: var(--header-height);
        background: rgba(0, 0, 0, 0.5);
        z-index: calc(var(--z-fixed) - 1);
    }

    .sidebar-backdrop.is-visible {
        display: block;
    }
}

/* ========================================
   RESPONSIVE: MOBILE (< 640px)
   ======================================== */
@media (max-width: 639px) {
    :root {
        --content-padding: var(--space-4);
    }

    .header {
        padding: 0 var(--space-4);
    }

    .header__nav {
        display: none;
    }

    .main {
        padding: var(--space-4);
    }

    .stats-bar {
        flex-wrap: wrap;
        gap: var(--space-3);
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-2 {
    gap: var(--space-2);
}

.gap-4 {
    gap: var(--space-4);
}

.text-muted {
    color: var(--color-text-muted);
}

.text-sm {
    font-size: var(--font-size-sm);
}

.font-medium {
    font-weight: var(--font-weight-medium);
}

.font-semibold {
    font-weight: var(--font-weight-semibold);
}