/* ============================================
   OUDIFY — Layout System
   Sidebar + Main Content, Responsive
   ============================================ */

/* --- App Shell --- */
.app {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: var(--z-base);
}

/* --- Sidebar (Desktop) --- */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--space-6) var(--space-4);
    background: rgba(10, 10, 18, 0.6);
    backdrop-filter: blur(24px) saturate(1.3);
    -webkit-backdrop-filter: blur(24px) saturate(1.3);
    border-right: 1px solid var(--border-glass);
    z-index: var(--z-sidebar);
    transition: width var(--transition-slow);
}

/* --- Logo --- */
.sidebar__logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0 var(--space-3);
    margin-bottom: var(--space-10);
    text-decoration: none;
}

.sidebar__logo-text {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--accent-primary);
    letter-spacing: 0.04em;
}

.sidebar__logo-icon {
    width: 28px;
    height: 28px;
    color: var(--accent-primary);
}

/* --- Navigation --- */
.sidebar__nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.08) transparent;
}

.sidebar__nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar__nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar__nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    text-decoration: none;
    transition:
        background var(--transition-fast),
        color var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.sidebar__link:hover {
    color: var(--text-primary);
    background: var(--bg-glass);
}

.sidebar__link.active {
    color: var(--accent-primary);
    background: rgba(212, 165, 116, 0.1);
}

.sidebar__link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

.sidebar__link-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
}

.sidebar__link.active .sidebar__link-icon {
    opacity: 1;
}

.sidebar__link-label {
    white-space: nowrap;
    overflow: hidden;
}

/* --- Collapsible Groups --- */
.sidebar__group {
    margin: var(--space-1) 0;
}

.sidebar__group-toggle {
    display: flex;
    align-items: center;
    width: 100%;
    padding: var(--space-2) var(--space-4);
    border: none;
    background: none;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    cursor: pointer;
    transition: color 0.15s;
}

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

.sidebar__group-label {
    flex: 1;
    text-align: left;
}

.sidebar__chevron {
    width: 14px;
    height: 14px;
    opacity: 0.4;
    transition: transform 0.2s ease;
}

.sidebar__group--open .sidebar__chevron {
    transform: rotate(180deg);
}

.sidebar__group-children {
    overflow: hidden;
}

.sidebar__group-children .sidebar__link {
    padding-left: calc(var(--space-4) + 8px);
    font-size: calc(var(--text-sm) - 0.5px);
}

/* --- Sidebar Footer --- */
.sidebar__footer {
    margin-top: auto;
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-glass);
}

/* --- Main Content Area --- */
.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left var(--transition-slow);
}

.main__content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: var(--space-8) var(--space-8);
}

/* Hidden sidebar for onboarding */
.sidebar--hidden {
    display: none !important;
}

.main-content--full .main,
.app:has(.sidebar--hidden) .main {
    margin-left: 0 !important;
}

/* --- Page Header --- */
.page-header {
    margin-bottom: var(--space-8);
}

.page-header__title {
    font-family: var(--font-body);
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--text-primary);
}

.page-header__subtitle {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-top: var(--space-1);
}

/* --- Content Grid --- */
.grid {
    display: grid;
    gap: var(--space-6);
}

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

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

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

/* --- Page Container (for page transitions) --- */
.page {
    opacity: 0;
    transform: translateY(12px);
    transition:
        opacity 400ms cubic-bezier(0.16, 1, 0.3, 1),
        transform 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

.page.active {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Bottom Tab Bar (Mobile)
   ============================================ */
.bottom-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-bar-height);
    background: rgba(10, 10, 18, 0.85);
    backdrop-filter: blur(24px) saturate(1.3);
    -webkit-backdrop-filter: blur(24px) saturate(1.3);
    border-top: 1px solid var(--border-glass);
    z-index: var(--z-sidebar);
    padding: 0 var(--space-2);
    padding-bottom: env(safe-area-inset-bottom, 0);
}

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

.bottom-bar__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 10px;
    font-weight: 500;
    transition:
        color var(--transition-fast),
        transform var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

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

.bottom-bar__link.active {
    color: var(--accent-primary);
}

.bottom-bar__link.active .bottom-bar__icon {
    filter: drop-shadow(0 0 6px rgba(212, 165, 116, 0.5));
}

.bottom-bar__icon {
    width: 22px;
    height: 22px;
}

/* ============================================
   PWA Install Banner
   ============================================ */
.pwa-install-banner {
    position: fixed;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-5);
    background: rgba(20, 20, 32, 0.95);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    z-index: 9999;
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from {
        transform: translateX(-50%) translateY(100px);
        opacity: 0;
    }

    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

.pwa-install-banner__text {
    font-size: var(--text-sm);
    color: var(--text-primary);
    white-space: nowrap;
}

.pwa-install-banner__btn {
    padding: var(--space-2) var(--space-4);
    background: linear-gradient(135deg, var(--gold-400), var(--gold-600));
    border: none;
    border-radius: var(--radius-md);
    color: #000;
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease;
    white-space: nowrap;
}

.pwa-install-banner__btn:hover {
    transform: scale(1.05);
}

.pwa-install-banner__close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: var(--text-base);
    cursor: pointer;
    padding: var(--space-1);
    line-height: 1;
}

.pwa-install-banner__close:hover {
    color: var(--text-primary);
}

@media (max-width: 640px) {
    .pwa-install-banner {
        left: var(--space-3);
        right: var(--space-3);
        transform: none;
        bottom: calc(var(--bottom-bar-height) + env(safe-area-inset-bottom, 0) + var(--space-3));
    }

    @keyframes slideUp {
        from {
            transform: translateY(100px);
            opacity: 0;
        }

        to {
            transform: translateY(0);
            opacity: 1;
        }
    }
}

/* ============================================
   Responsive Breakpoints
   ============================================ */

/* Tablet: collapsed sidebar */
@media (max-width: 1024px) {
    .sidebar {
        width: var(--sidebar-collapsed);
        padding: var(--space-6) var(--space-3);
        align-items: center;
    }

    .sidebar__logo-text,
    .sidebar__link-label {
        display: none;
    }

    .sidebar__logo {
        justify-content: center;
        padding: 0;
    }

    .sidebar__link {
        justify-content: center;
        padding: var(--space-3);
        gap: 0;
    }

    .sidebar__link.active::before {
        display: none;
    }

    /* Hide group labels, search kbd, and gamification in collapsed mode */
    .sidebar__group-label,
    .sidebar__group-chevron,
    .sidebar__search-btn kbd,
    .sidebar-gamification .streak-widget__info,
    .sidebar-gamification .kp-counter__label,
    .sidebar-gamification .kp-counter__value,
    .sidebar-gamification .daily-ring__info {
        display: none;
    }

    .sidebar__group-toggle {
        justify-content: center;
        padding: var(--space-2);
    }

    .sidebar__search-btn {
        justify-content: center;
        padding: var(--space-3);
    }

    .sidebar-gamification {
        padding: var(--space-2);
        gap: var(--space-1);
    }

    .streak-widget,
    .kp-counter,
    .daily-ring {
        justify-content: center;
        padding: var(--space-2);
        gap: 0;
    }

    .main {
        margin-left: var(--sidebar-collapsed);
    }

    .main__content {
        padding: var(--space-6);
    }
}

/* Mobile: bottom bar */
@media (max-width: 640px) {
    .sidebar {
        display: none;
    }

    .bottom-bar {
        display: block;
    }

    .main {
        margin-left: 0;
        padding-bottom: calc(var(--bottom-bar-height) + env(safe-area-inset-bottom, 0) + var(--space-4));
    }

    .main__content {
        padding: var(--space-4) var(--space-4);
        padding-bottom: var(--space-8);
    }

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

    .page-header__title {
        font-size: var(--text-xl);
    }

    /* Bottom bar touch targets */
    .bottom-bar__link {
        min-height: 44px;
        min-width: 44px;
    }

    /* Share section mobile */
    .share-section__buttons {
        flex-direction: column;
    }

    /* Full-width glass cards */
    .glass {
        border-radius: var(--radius-md);
    }
}

/* ═══ Share Section ═══ */
.share-section {
    padding: var(--space-4);
}

.share-section__title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
}

.share-section__buttons {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}