/* ============================================
   Layout — Widget Shell, Sidebar, Content, Grid
   ============================================ */

/* App Shell — centers the widget on the viewport */
.app-shell {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100vw;
    height: 100vh;
    padding: 24px;
}

/* App Widget — the macOS-style glass window */
.app-widget {
    display: flex;
    width: 100%;
    max-width: 1400px;
    height: 100%;
    max-height: 900px;
    border-radius: var(--widget-radius);
    border: var(--widget-border);
    box-shadow: var(--widget-shadow);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    overflow: hidden;
    position: relative;
}

/* Sidebar — left icon nav column */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-lg) 0;
    background: var(--sidebar-bg);
    border-right: 1px solid rgba(255, 255, 255, 0.06);
    gap: var(--space-xs);
    overflow-y: auto;
}

.sidebar__logo {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    margin-bottom: var(--space-lg);
    letter-spacing: 0.05em;
}

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

.sidebar__nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    flex: 1;
    width: 100%;
    padding: 0 var(--space-sm);
}

.sidebar__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: var(--space-sm) 0;
    width: 100%;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 9px;
    font-weight: 500;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
}

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

.sidebar__link--active {
    color: var(--accent-ice);
}

.sidebar__icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
    transition: all var(--transition-fast);
    background: transparent;
}

.sidebar__link:hover .sidebar__icon {
    background: rgba(255, 255, 255, 0.06);
}

.sidebar__link--active .sidebar__icon {
    background: rgba(102, 187, 221, 0.12);
    color: var(--accent-ice);
}

.sidebar__social {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    margin-top: auto;
    padding-top: var(--space-lg);
}

.sidebar__social-link {
    color: var(--text-muted);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.sidebar__social-link:hover {
    color: var(--accent-ice);
}

/* Content Area — scrollable right panel */
.content-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-2xl) var(--space-2xl) var(--space-3xl);
    scroll-behavior: smooth;
}

/* Mobile Bottom Nav */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--mobile-nav-height);
    background: var(--glass-bg-strong);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 1000;
    padding: 0 var(--space-sm);
}

.mobile-nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-around;
    height: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.mobile-nav__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 9px;
    font-weight: 500;
    padding: var(--space-xs);
    transition: color var(--transition-fast);
}

.mobile-nav__link:hover {
    color: var(--text-secondary);
}

.mobile-nav__link--active {
    color: var(--accent-ice);
}

.mobile-nav__icon {
    font-size: var(--text-lg);
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.container--narrow {
    max-width: var(--content-width);
}

/* Grid system */
.grid {
    display: grid;
    gap: var(--space-lg);
    align-items: stretch;
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* Cards fill their grid cell height */
.grid > .card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.grid > .card > .card__body > .card__meta {
    margin-top: auto;
    padding-top: var(--space-md);
}

.grid--auto-fill {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

/* Section spacing */
.section {
    margin-bottom: var(--space-3xl);
}

.section__header {
    margin-bottom: var(--space-xl);
}

.section__title {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-sm);
}

.section__subtitle {
    color: var(--text-secondary);
    font-size: var(--text-lg);
}

/* Page headers */
.page-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--border-color);
}

.page-header__title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-sm);
}

.page-header__description {
    color: var(--text-secondary);
    font-size: var(--text-lg);
    max-width: 600px;
}

/* Responsive */
@media (max-width: 1024px) {
    .grid--4 { grid-template-columns: repeat(2, 1fr); }
    .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.5rem;
    }

    /* Full-screen widget on mobile */
    .app-shell {
        padding: 0;
    }

    .app-widget {
        border-radius: 0;
        max-height: none;
        border: none;
        box-shadow: none;
    }

    /* Hide sidebar, show bottom nav */
    .sidebar {
        display: none;
    }

    .mobile-nav {
        display: block;
    }

    .content-area {
        padding: var(--space-lg) var(--space-md) calc(var(--mobile-nav-height) + var(--space-xl));
    }

    .grid--2,
    .grid--3,
    .grid--4 {
        grid-template-columns: 1fr;
    }

    .grid--auto-fill {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 var(--space-md);
    }
}

@media (max-width: 480px) {
    :root {
        --text-5xl: 2rem;
        --text-4xl: 1.75rem;
    }
}