/* shorts.css — ADR-04 Phase E 視聴 feed UI。
 *
 * フルスクリーン縦動画フィード。レイヤー設計:
 *   z-index 0   #shorts-feed (絶対配置の <video> 群)
 *   z-index 10  各 slot の caption + actions overlay
 *   z-index 20  #shorts-topbar (固定ヘッダ)
 *   z-index 30  #shorts-state  (loading / empty / error 状態 overlay)
 *
 * ローディング時のフリッカ対策で body は黒固定。strict CSP 準拠 (inline 0)。
 */

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: #000;
    color: #fff;
    font-family: 'M PLUS Rounded 1c', 'Zen Maru Gothic', system-ui, -apple-system, sans-serif;
    overflow: hidden;
    /* iOS Safari の overscroll bounce を抑止 (フィード swipe と競合する) */
    overscroll-behavior: none;
    height: 100%;
    width: 100%;
}

body {
    /* dynamic viewport (svh/dvh) で iOS の url-bar 出没を吸収。
       未対応ブラウザは vh fallback */
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    /* Disable touch callout/select to keep gestures clean */
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

#shorts-root {
    position: fixed;
    inset: 0;
    overflow: hidden;
    touch-action: none; /* swipe 物理量を自前で扱うため pinch-to-zoom 等を切る */
}

/* ---- Feed slots --------------------------------------------------------- */

#shorts-feed {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.shorts-slot {
    position: absolute;
    inset: 0;
    /* translateY を shorts.js が動的更新 (current=0%, prev=-100%, next=+100%) */
    transform: translateY(0);
    will-change: transform;
    background: #000;
}

/* swipe 中は transition 切って物理追従、release で snap 用に短い ease */
.shorts-slot.is-snapping {
    transition: transform 220ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.shorts-slot video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #000;
}

/* Thumb poster fallback for not-yet-loaded videos */
.shorts-slot .shorts-poster {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #111;
}

.shorts-slot .shorts-spinner {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    pointer-events: none;
}

.shorts-slot[data-loading="false"] .shorts-spinner {
    display: none;
}

/* ---- Caption + broadcaster (bottom-left) -------------------------------- */

.shorts-meta {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10;
    padding: 1rem 4.5rem 1.5rem 1rem; /* right padding leaves room for action rail */
    padding-bottom: calc(1.5rem + env(safe-area-inset-bottom, 0));
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0) 100%);
    pointer-events: none; /* let taps through to <video>, individual children opt back in */
}

.shorts-broadcaster {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    pointer-events: auto;
    margin-bottom: 0.5rem;
}

.shorts-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #444;
    overflow: hidden;
    flex-shrink: 0;
    border: 1.5px solid rgba(255, 255, 255, 0.6);
}

.shorts-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.shorts-avatar-placeholder {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    color: #999;
    font-size: 0.9rem;
    font-weight: 600;
}

.shorts-name {
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.2;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    /* clamp long display names */
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 60vw;
}

.shorts-caption {
    font-size: 0.9rem;
    line-height: 1.4;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
    pointer-events: auto;
    -webkit-user-select: text;
    user-select: text;
    /* 3 行で切る */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

/* ---- Action rail (right side) ------------------------------------------ */

.shorts-actions {
    position: absolute;
    right: 0.5rem;
    bottom: 0;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding-right: 0.25rem;
    padding-bottom: calc(1.5rem + env(safe-area-inset-bottom, 0));
    pointer-events: auto;
}

.shorts-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    background: transparent;
    border: 0;
    color: #fff;
    cursor: pointer;
    padding: 0.5rem;
    font: inherit;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
}

.shorts-action:active {
    transform: scale(0.92);
}

.shorts-action-icon {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 50%;
}

.shorts-action.is-liked .shorts-action-icon {
    background: rgba(255, 64, 129, 0.95);
}

.shorts-action-count {
    font-size: 0.78rem;
    font-weight: 600;
    min-height: 1em;
}

/* ---- Tap-to-play / pause indicator (transient) ------------------------- */

.shorts-tap-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 10;
    transform: translate(-50%, -50%) scale(0.6);
    background: rgba(0, 0, 0, 0.55);
    border-radius: 50%;
    width: 72px;
    height: 72px;
    display: grid;
    place-items: center;
    color: #fff;
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms ease-out, transform 200ms ease-out;
}

.shorts-tap-indicator.is-visible {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* Double-tap heart burst */
.shorts-heart-burst {
    position: absolute;
    z-index: 11;
    pointer-events: none;
    font-size: 4rem;
    color: #ff4081;
    transform: translate(-50%, -50%) scale(0.5);
    opacity: 0;
    animation: shorts-heart-burst 700ms ease-out forwards;
}

@keyframes shorts-heart-burst {
    0% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
    20% { opacity: 1; transform: translate(-50%, -50%) scale(1.2); }
    100% { opacity: 0; transform: translate(-50%, -50%) scale(2.2); }
}

/* ---- Top bar ----------------------------------------------------------- */

#shorts-topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    padding-top: calc(0.5rem + env(safe-area-inset-top, 0));
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0) 100%);
    pointer-events: none;
}

#shorts-topbar > * {
    pointer-events: auto;
}

.shorts-back {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: #fff;
    text-decoration: none;
    background: rgba(0, 0, 0, 0.25);
}

.shorts-title {
    font-weight: 700;
    font-size: 1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
}

/* ---- State overlay (loading / empty / error) --------------------------- */

.shorts-state {
    position: fixed;
    inset: 0;
    z-index: 30;
    display: grid;
    place-items: center;
    background: #000;
    text-align: center;
    padding: 2rem;
    pointer-events: auto;
}

.shorts-state[data-state="hidden"] {
    display: none;
}

.shorts-state-msg {
    margin: 0 0 1rem 0;
    font-size: 1rem;
    line-height: 1.5;
    color: rgba(255, 255, 255, 0.85);
}

.shorts-state-btn {
    appearance: none;
    border: 0;
    background: #ff4081;
    color: #fff;
    font: inherit;
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: 999px;
    cursor: pointer;
}

.shorts-state-btn[hidden] {
    display: none;
}