@media (min-width: 480px) {
    .app-frame {
        block-size: 94vh;
        margin-block: 3vh;
        border-radius: 20px;
        border: 1px solid var(--glass-border);
        box-shadow: 0 8px 40px rgba(30, 50, 70, 0.1);
    }
}

.app-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 12px;
    padding-inline: 16px;
    padding-block: 14px;
    background: var(--header-bg);
}

.app-header__brand {
    display: grid;
    grid-auto-flow: column;
    justify-content: start;
    align-items: center;
    gap: 10px;
    min-inline-size: 0;
}

.app-header__eyebrow {
    font-size: 11px;
    font-weight: 500;
    color: var(--header-sub);
}

.app-header__divider {
    inline-size: 1px;
    block-size: 14px;
    background: var(--header-divider);
}

.app-header__title {
    font-family: var(--font-ui);
    font-size: 24px;
    font-weight: 700;
    color: var(--header-text);
    line-height: 1;
    min-inline-size: 0;
}

.app-header__controls {
    display: grid;
    grid-auto-flow: column;
    gap: 6px;
}

.diagram-gallery {
    inline-size: 100%;
    padding-block-end: 12px;
}

.diagram-gallery__viewport {
    position: relative;
    inline-size: 100%;
    min-inline-size: 0;
}

.chord-grid {
    display: flex;
    flex-wrap: nowrap;
    gap: 12px;
    inline-size: 100%;
    block-size: 342px;
    padding-inline: 12px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: 12px;
    align-items: start;
    min-inline-size: 0;
    scroll-behavior: smooth;
    touch-action: pan-x;
    overscroll-behavior-x: contain;
}

.chord-grid::-webkit-scrollbar {
    display: none;
}

.chord-page {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 200px));
    justify-content: center;
    grid-auto-rows: 110px;
    gap: 6px;
    flex: 0 0 100%;
    scroll-snap-align: start;
    inline-size: 100%;
    position: relative;
}

.control-panel {
    background: linear-gradient(180deg, var(--panel-bg-top) 0%, var(--panel-bg-bot) 100%);
    border-block-start: 1px solid rgba(0, 0, 0, 0.05);
    padding-block: 14px;
    padding-inline: 8px;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: end;
    position: relative;
    z-index: 10;
    box-shadow: 0 -10px 40px rgba(20, 45, 60, 0.05);
    inline-size: 100%;
}

.control-panel__wheel {
    display: grid;
    justify-items: center;
    inline-size: 156px;
    padding-block-end: 14px;
}

.control-panel__content {
    display: grid;
    min-inline-size: 0;
    padding-inline-end: 2px;
    margin-inline-start: 8px;
}

.promo-banner {
    padding-inline: 16px;
    padding-block: 20px;
    border-block-start: 1px solid rgba(0, 0, 0, 0.05);
    display: grid;
    place-items: center;
    inline-size: 100%;
}

.app-footer {
    display: grid;
    gap: 0;
    justify-items: center;
    padding: 12px 16px 20px;
    color: var(--text-secondary);
    font-size: 10px;
    line-height: 1.5;
    text-align: center;
    opacity: 0.8;
}

.app-footer__link {
    color: var(--accent-blue);
    text-decoration: none;
}

.settings-drawer-overlay,
.staff-modal-overlay,
.modal-sheet-backdrop {
    position: absolute;
    inset: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.settings-drawer-overlay,
.staff-modal-overlay {
    position: fixed;
}

.settings-drawer-overlay,
.staff-modal-overlay {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.settings-drawer-overlay {
    z-index: 200;
}

.staff-modal-overlay {
    z-index: 100;
    display: grid;
    place-items: center;
}

.modal-sheet-backdrop {
    background: rgba(0, 0, 0, 0.4);
    z-index: 120;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
}

.settings-drawer-overlay.is-active,
.staff-modal-overlay.is-active,
.modal-sheet-backdrop.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.settings-drawer {
    position: fixed;
    inset-block: 0;
    inset-inline-end: max(0px, calc((100vw - 480px) / 2));
    inline-size: min(80vw, 320px);
    background: var(--bg-surface);
    box-shadow: -5px 0 25px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.2, 0, 0, 1);
    display: grid;
    grid-template-rows: auto 1fr;
}

.settings-drawer-overlay.is-active .settings-drawer {
    transform: translateX(0);
}

@media (min-width: 480px) {
    .settings-drawer {
        inset-block: 3vh;
        border-start-start-radius: 20px;
        border-end-start-radius: 20px;
        overflow: hidden;
    }
}

.staff-modal {
    background: var(--bg-surface);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 24px 20px 20px;
    inline-size: min(92vw, 368px);
    block-size: auto;
    max-block-size: min(84vh, 438px);
    overflow: auto;
    box-shadow: 0 16px 40px rgba(24, 37, 48, 0.2);
    transform: translateY(20px) scale(0.98);
    transition: transform 0.35s cubic-bezier(0.2, 0, 0, 1);
    display: grid;
    grid-template-rows: auto auto auto;
    align-content: start;
    gap: 12px;
}

.staff-modal-overlay.is-active .staff-modal {
    transform: translateY(0) scale(1);
}

.modal-sheet {
    position: absolute;
    inset-inline: 0;
    inset-block-end: 0;
    background: linear-gradient(180deg, rgba(230, 234, 242, 0.96) 0%, rgba(212, 220, 232, 0.98) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-start-start-radius: 24px;
    border-start-end-radius: 24px;
    border-block-start: 1px solid rgba(255, 255, 255, 0.6);
    padding: 20px 16px 36px;
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.1);
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.2);
}

.modal-sheet-backdrop.is-visible .modal-sheet {
    transform: translateY(0);
}

@media (max-width: 374px) {
    .app-frame {
        min-inline-size: 100%;
    }
}