/* Signal BGM 위젯 — 미니멀 오디오 캡처 유닛 컨셉 */

.bgm-signal {
    --sig-bg: #151619;
    --sig-text: #FFFFFF;
    --sig-dim: #8E9299;
    --sig-accent: #FF4444;
    --sig-wave: var(--sig-text);
    --sig-line: color-mix(in srgb, var(--sig-text) 12%, transparent);
    --sig-soft: color-mix(in srgb, var(--sig-text) 5%, transparent);
    --sig-font: var(--content-font-family, var(--f-pre, 'Pretendard')), -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --sig-ease: cubic-bezier(0.16, 1, 0.3, 1);

    position: fixed;
    bottom: var(--spacing-lg, 24px);
    right: var(--spacing-lg, 24px);
    width: 300px;
    background: var(--sig-bg);
    color: var(--sig-text);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
    z-index: 9990;
    font-family: var(--sig-font);
    overflow: hidden;
    transform: translateY(24px);
    opacity: 0;
    transition: opacity 0.5s var(--sig-ease), transform 0.6s var(--sig-ease);
    -webkit-user-select: none;
    user-select: none;
    box-sizing: border-box;
}
.bgm-signal *, .bgm-signal *::before, .bgm-signal *::after { box-sizing: border-box; }
.bgm-signal button { font-family: inherit; margin: 0; }
.bgm-signal :focus { outline: none; }
.bgm-signal :focus-visible {
    outline: 1px solid var(--sig-accent);
    outline-offset: 3px;
}
.bgm-signal .sig-vol-slider:focus-visible { outline-offset: 5px; }

.bgm-signal.is-shown { transform: translateY(0); opacity: 1; }
.bgm-signal .sig-num { font-variant-numeric: tabular-nums; }

/* 최소화 */
.bgm-signal.is-minimized { width: 52px; height: 52px; border-radius: 50%; }
.bgm-signal.is-minimized:hover { transform: scale(1.06); }
.bgm-signal.is-minimized .sig-content { display: none; }
.sig-minimized-overlay {
    display: none;
    position: absolute;
    inset: 0;
    border: none;
    border-radius: inherit;
    background: transparent;
    color: var(--sig-text);
    cursor: pointer;
    font-size: 16px;
}
.sig-minimized-overlay::before { content: '\f001'; font-family: 'Font Awesome 6 Free'; font-weight: 900; }
.bgm-signal.is-minimized .sig-minimized-overlay { display: flex; align-items: center; justify-content: center; }
.bgm-signal.is-minimized.is-playing .sig-minimized-overlay { color: var(--sig-accent); }

.sig-content { display: flex; flex-direction: column; }

/* 헤더 */
.sig-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 18px 0; }
.sig-header-tools { display: flex; gap: 6px; }
.sig-header { gap: 10px; }
.sig-ref { min-width: 0; font-size: 11px; letter-spacing: 0.04em; color: var(--sig-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.sig-min-btn {
    width: 22px; height: 22px;
    border-radius: 50%;
    border: 1px solid var(--sig-line);
    background: transparent;
    color: var(--sig-dim);
    font-size: 10px;
    line-height: 1;
    padding: 0;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: color 0.2s ease, border-color 0.2s ease;
}
.sig-min-btn:hover { color: var(--sig-text); border-color: color-mix(in srgb, var(--sig-text) 35%, transparent); }

/* 스테이지: prev / 원형 HUD / next 한 행 */
.sig-stage { display: flex; align-items: center; justify-content: center; padding: 20px 8px 8px; }
.sig-hud { display: flex; align-items: center; justify-content: center; gap: 8px; }

.sig-side-btn {
    width: 28px; height: 28px;
    border-radius: 50%;
    border: none;
    background: transparent;
    padding: 0;
    cursor: pointer;
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    opacity: 0.55;
    transition: opacity 0.2s ease, transform 0.15s ease;
}
.sig-side-btn:hover:not(:disabled) { opacity: 0.95; }
.sig-side-btn:active:not(:disabled) { transform: scale(0.9); }
.sig-side-btn:disabled { opacity: 0.2; cursor: not-allowed; }

.sig-tri { width: 0; height: 0; border-top: 6px solid transparent; border-bottom: 6px solid transparent; pointer-events: none; }
.sig-tri--prev { border-right: 9px solid var(--sig-text); }
.sig-tri--next { border-left: 9px solid var(--sig-text); }

.sig-ring-wrap { position: relative; width: 200px; height: 200px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.sig-canvas { position: absolute; top: 0; left: 0; z-index: 1; pointer-events: none; }

.sig-track {
    position: absolute;
    width: 124px; height: 124px;
    border: 1px dashed var(--sig-dim);
    border-radius: 50%;
    opacity: 0.5;
    pointer-events: none;
}
.bgm-signal.is-playing .sig-track { animation: sig-spin 60s linear infinite; }
@keyframes sig-spin { to { transform: rotate(360deg); } }

.sig-pulse { position: absolute; width: 56px; height: 56px; pointer-events: none; }
.sig-pulse span { position: absolute; inset: 0; border: 1px solid color-mix(in srgb, var(--sig-text) 30%, transparent); border-radius: 50%; opacity: 0; }
.bgm-signal.is-playing .sig-pulse span { animation: sig-pulse-ring 2s infinite cubic-bezier(0.215, 0.61, 0.355, 1); }
@keyframes sig-pulse-ring {
    0%   { transform: scale(0.8); opacity: 0; }
    50%  { opacity: 0.3; }
    100% { transform: scale(1.6); opacity: 0; }
}

.sig-trigger {
    position: relative;
    z-index: 2;
    width: 56px; height: 56px;
    border-radius: 50%;
    border: 1px solid var(--sig-dim);
    background: var(--sig-soft);
    color: var(--sig-text);
    padding: 0;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px;
    transition: transform 0.3s var(--sig-ease), border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, opacity 0.2s ease;
}
.sig-trigger i { pointer-events: none; padding-left: 2px; }
.sig-trigger i.fa-pause { padding-left: 0; }
.sig-trigger:hover:not(:disabled) { border-color: color-mix(in srgb, var(--sig-text) 60%, transparent); transform: scale(1.05); }
.sig-trigger:active:not(:disabled) { transform: scale(0.95); }
.sig-trigger:disabled { opacity: 0.35; cursor: not-allowed; }
.bgm-signal.is-playing .sig-trigger {
    border-color: var(--sig-accent);
    color: var(--sig-accent);
    box-shadow: 0 0 16px color-mix(in srgb, var(--sig-accent) 35%, transparent);
}

/* 불러오는 중: 재생 버튼 둘레를 도는 짧은 호 */
.sig-trigger::after {
    content: '';
    position: absolute;
    inset: -5px;
    border-radius: 50%;
    border: 1.5px solid transparent;
    border-top-color: var(--sig-accent);
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}
.bgm-signal.is-loading .sig-trigger::after { opacity: 1; animation: sig-spin 0.9s linear infinite; }

/* 작은 버튼은 보이는 크기는 그대로 두고 누를 수 있는 영역만 넓힌다 */
.sig-min-btn, .sig-side-btn { position: relative; }
.sig-min-btn::after, .sig-side-btn::after, .sig-chip::before {
    content: '';
    position: absolute;
    border-radius: 50%;
}
.sig-min-btn::after { inset: -4px; }
.sig-side-btn::after { inset: -8px; }
.sig-chip::before { inset: -4px; }

/* 푸터 */
.sig-footer { padding: 4px 18px 18px; }
.sig-status-row { margin-bottom: 14px; }
.sig-status-label { font-size: 10px; font-weight: 500; letter-spacing: 0.1em; color: var(--sig-dim); margin-bottom: 6px; }
.sig-readout { font-size: 13px; font-weight: 500; color: var(--sig-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sig-status-label.is-alert { color: var(--sig-accent); animation: sig-blink 1.6s ease-in-out infinite; }
@keyframes sig-blink { 50% { opacity: 0.45; } }
.bgm-signal.is-awaiting .sig-trigger { border-color: var(--sig-accent); color: var(--sig-accent); }
.sig-readout.is-empty { color: var(--sig-dim); font-weight: 400; }
.sig-readout.is-error { color: var(--sig-accent); font-weight: 400; }

.sig-mode-row { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }

.sig-chip {
    width: 28px; height: 28px;
    border-radius: 50%;
    border: 1px solid var(--sig-line);
    background: transparent;
    color: var(--sig-dim);
    font-size: 10px;
    padding: 0;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    position: relative;
    transition: color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
}
.sig-chip i, .sig-chip span { pointer-events: none; }
.sig-chip:hover:not(:disabled) { color: var(--sig-text); border-color: color-mix(in srgb, var(--sig-text) 35%, transparent); }
.sig-chip.active { color: var(--sig-accent); border-color: color-mix(in srgb, var(--sig-accent) 45%, transparent); }
.sig-chip:disabled { opacity: 0.3; cursor: not-allowed; }
.sig-repeat-one {
    position: absolute; top: -3px; right: -3px;
    width: 11px; height: 11px;
    border-radius: 50%;
    background: var(--sig-bg);
    color: var(--sig-accent);
    font-size: 7px; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
}

.sig-vol { position: relative; margin-left: auto; }
.sig-vol-pop {
    position: absolute;
    bottom: calc(100% + 10px);
    right: 0;
    background: color-mix(in srgb, var(--sig-bg) 92%, var(--sig-text));
    border: 1px solid var(--sig-line);
    border-radius: 10px;
    padding: 12px 8px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
    transform-origin: calc(100% - 14px) calc(100% + 24px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px) scale(0.92);
    transition: opacity 0.12s ease-in, transform 0.12s ease-in, visibility 0s linear 0.12s;
}
.sig-vol.is-open .sig-vol-pop {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: opacity 0.18s ease-out, transform 0.28s var(--sig-ease), visibility 0s;
}
.sig-vol-slider {
    writing-mode: vertical-lr;
    direction: rtl;
    width: 4px; height: 76px;
    margin: 0;
    -webkit-appearance: none;
    appearance: none;
    background: var(--sig-line);
    border-radius: 4px;
    cursor: pointer;
    display: block;
}
.sig-vol-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 12px; height: 12px; border-radius: 50%; background: var(--sig-text); cursor: pointer; }
.sig-vol-slider::-moz-range-thumb { width: 12px; height: 12px; border: none; border-radius: 50%; background: var(--sig-text); cursor: pointer; }

.sig-timer-row {
    display: flex; justify-content: space-between;
    font-size: 11px; letter-spacing: 0.02em;
    color: var(--sig-dim);
    border-top: 1px solid var(--sig-line);
    padding-top: 12px;
}

/* 재생목록 */
.sig-playlist {
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    visibility: hidden;
    transition: grid-template-rows 0.24s cubic-bezier(0.7, 0, 0.84, 0),
                opacity 0.14s ease-in, visibility 0s linear 0.24s;
}
.sig-playlist.is-open {
    grid-template-rows: 1fr;
    opacity: 1;
    visibility: visible;
    transition: grid-template-rows 0.42s var(--sig-ease),
                opacity 0.2s ease-out, visibility 0s;
}
/* 간격(14px)도 클립 안쪽에 두어 행 높이 전환과 함께 접히게 한다 */
.sig-playlist-inner {
    min-height: 0;
    overflow: hidden;
}

/* 플레이리스트 선택 드롭다운 (2개 이상일 때만) */
.sig-pl-picker { position: relative; margin-top: 14px; }
.sig-pl-picker[hidden] { display: none; }
.sig-pl-picker:not([hidden]) + .sig-playlist-ul { margin-top: 8px; }
.sig-pl-select {
    display: block;
    width: 100%;
    height: 32px;
    margin: 0;
    padding: 0 30px 0 12px;
    border: 1px solid var(--sig-line);
    border-radius: 8px;
    background: var(--sig-soft);
    color: var(--sig-text);
    font-family: inherit;
    font-size: 12px;
    text-overflow: ellipsis;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    transition: border-color 0.2s ease;
}
.sig-pl-select:hover { border-color: color-mix(in srgb, var(--sig-text) 35%, transparent); }
.sig-pl-select option { background: var(--sig-bg); color: var(--sig-text); }
.bgm-signal .sig-pl-select:focus-visible { outline-offset: -2px; }
.sig-pl-caret {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 9px;
    color: var(--sig-dim);
    pointer-events: none;
}
.sig-playlist-ul {
    list-style: none;
    margin: 14px 0 0;
    padding: 0;
    position: relative;
    max-height: 140px;
    overflow-y: auto;
    scrollbar-width: none;
    border: 1px solid var(--sig-line);
    border-radius: 10px;
    background: var(--sig-soft);
}
.sig-playlist-ul::-webkit-scrollbar { display: none; }
.sig-playlist-ul[data-overflow~="bottom"] {
    -webkit-mask-image: linear-gradient(to bottom, #000 calc(100% - 28px), transparent);
    mask-image: linear-gradient(to bottom, #000 calc(100% - 28px), transparent);
}
.sig-playlist-ul[data-overflow~="top"] {
    -webkit-mask-image: linear-gradient(to top, #000 calc(100% - 28px), transparent);
    mask-image: linear-gradient(to top, #000 calc(100% - 28px), transparent);
}
.sig-playlist-ul[data-overflow~="top"][data-overflow~="bottom"] {
    -webkit-mask-image: linear-gradient(to bottom, transparent, #000 28px, #000 calc(100% - 28px), transparent);
    mask-image: linear-gradient(to bottom, transparent, #000 28px, #000 calc(100% - 28px), transparent);
}
.sig-playlist-ul li { border-bottom: 1px solid var(--sig-line); }
.sig-playlist-ul li:last-child { border-bottom: none; }
.sig-track-btn {
    display: block;
    width: 100%;
    padding: 9px 12px;
    border: none;
    background: transparent;
    color: var(--sig-dim);
    font-size: 11px;
    line-height: 1.4;
    text-align: left;
    cursor: pointer;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    transition: color 0.2s ease, background-color 0.2s ease;
}
.sig-track-btn:hover { color: var(--sig-text); background: var(--sig-soft); }
.bgm-signal .sig-track-btn:focus-visible { outline-offset: -3px; }
.sig-playlist-ul li.is-current .sig-track-btn { color: var(--sig-accent); }
.sig-playlist-ul li.is-empty { padding: 16px 12px; font-size: 11px; color: var(--sig-dim); text-align: center; }

@media (max-width: 480px) {
    .bgm-signal { right: 16px; bottom: 16px; width: calc(100vw - 32px); max-width: 300px; }
}

@media (prefers-reduced-motion: reduce) {
    .bgm-signal { transform: none; transition: opacity 0.2s ease-out; }
    .bgm-signal.is-minimized:hover { transform: none; }
    .bgm-signal.is-playing .sig-track,
    .bgm-signal.is-playing .sig-pulse span { animation: none; }
    .sig-trigger:hover:not(:disabled), .sig-trigger:active:not(:disabled),
    .sig-side-btn:active:not(:disabled) { transform: none; }
    .sig-vol-pop, .sig-vol.is-open .sig-vol-pop { transform: none; }
    .sig-playlist { transition: opacity 0.18s ease-out, visibility 0s linear 0.18s; }
    .sig-playlist.is-open { transition: opacity 0.18s ease-out, visibility 0s; }
    .bgm-signal.is-loading .sig-trigger::after { animation: sig-loading-fade 1.2s ease-in-out infinite alternate; }
    .sig-status-label.is-alert { animation: none; }
    @keyframes sig-loading-fade { from { opacity: 0.25; } to { opacity: 1; } }
}