/* ============================================================
   라이브 가사 프롬프터 — 노래 커버 라이브 방송용
   - 검은 배경 + 노란 강조
   - 줄 단위 수동 진행 (Space/↑↓/클릭)
   - 풀스크린 + 좌우반전 + 자동 저장
   ============================================================ */

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.prompter-body {
    background: #000;
    color: #fff;
    font-family: 'NanumSquare', 'Pretendard', 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === 공통 화면 컨테이너 === */
.prompter-screen {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.prompter-screen[hidden] {
    display: none;
}

/* === 코너 버튼 (BACK / FULLSCREEN) === */
.prompter-corner-btn {
    position: fixed;
    z-index: 50;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.95rem;
    border: 1px solid rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: 999px;
    backdrop-filter: blur(8px);
    cursor: pointer;
    transition: opacity 0.2s, color 0.2s, background 0.2s, border-color 0.2s;
}

.prompter-corner-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.4);
}

.prompter-corner-btn--top-left { top: 18px; left: 18px; }
.prompter-corner-btn--top-right { top: 18px; right: 18px; }

.prompter-fs-btn {
    opacity: 0.4;
}

.prompter-fs-btn:hover {
    opacity: 1;
}

.prompter-brand {
    font-family: 'Space Grotesk', sans-serif;
}

/* === 입력 화면 === */
.prompter-screen--input {
    padding: clamp(2rem, 6vw, 5rem);
}

.prompter-input-wrap {
    width: 100%;
    max-width: 880px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.prompter-input-eyebrow {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    color: rgba(255, 255, 0, 0.65);
    margin-bottom: 1.5rem;
}

.prompter-input-title {
    font-size: clamp(2rem, 5vw, 3.4rem);
    font-weight: 900;
    letter-spacing: -0.025em;
    color: rgba(255, 255, 255, 0.25);
    margin: 0 0 0.6rem;
}

.prompter-input-sub {
    font-size: 0.92rem;
    color: rgba(255, 255, 255, 0.4);
    margin: 0 0 2rem;
    letter-spacing: -0.005em;
}

.prompter-input-area {
    width: 100%;
    height: clamp(220px, 40vh, 360px);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 1.6rem;
    color: rgba(255, 255, 255, 0.85);
    font-family: inherit;
    font-size: clamp(1rem, 1.4vw, 1.25rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.55;
    text-align: center;
    resize: none;
    outline: none;
    transition: border-color 0.2s, color 0.2s;
}

.prompter-input-area::placeholder {
    color: rgba(255, 255, 255, 0.18);
    font-weight: 800;
}

.prompter-input-area:focus {
    border-color: rgba(255, 255, 0, 0.4);
    color: #fff;
}

.prompter-input-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin: 1rem 0 1.8rem;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 0.05em;
}

.prompter-meta-item i {
    margin-right: 0.3rem;
    color: rgba(255, 255, 0, 0.5);
}

.prompter-meta-saved {
    margin-left: auto;
    color: #4ade80;
    font-weight: 700;
}

.prompter-meta-saved.is-saving {
    color: rgba(255, 255, 255, 0.4);
}

/* === 입력 컨트롤 === */
.prompter-input-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    justify-content: center;
    margin-bottom: 1.2rem;
}

.prompter-secondary-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.7rem 1.1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.04);
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
}

.prompter-secondary-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.35);
}

.prompter-secondary-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.prompter-secondary-btn.is-success {
    background: rgba(74, 222, 128, 0.12);
    border-color: rgba(74, 222, 128, 0.45);
    color: #4ade80;
}

.prompter-secondary-btn.is-error {
    background: rgba(248, 113, 113, 0.12);
    border-color: rgba(248, 113, 113, 0.45);
    color: #f87171;
}

.prompter-start-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2.2rem;
    border: 1px solid rgba(255, 255, 0, 0.4);
    background: rgba(255, 255, 0, 0.1);
    color: rgba(255, 255, 0, 0.95);
    font-size: 0.88rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.prompter-start-btn:hover:not(:disabled) {
    background: rgba(255, 255, 0, 0.2);
    border-color: rgba(255, 255, 0, 0.7);
    color: #fff;
    transform: translateY(-1px);
}

.prompter-start-btn:disabled {
    opacity: 0.25;
    cursor: not-allowed;
}

.prompter-input-hint {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.3);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.prompter-input-hint kbd {
    display: inline-block;
    padding: 0.18rem 0.5rem;
    margin: 0 2px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 4px;
    font-family: 'Space Grotesk', monospace;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.55);
}

/* === 프롬프터 화면 === */
.prompter-screen--stage {
    padding: 0;
    /* overflow:hidden — 마우스 휠/터치 드래그로 사용자가 스크롤하지 못하게 차단.
       JS의 scrollTop 직접 할당(커스텀 RAF)은 그대로 작동.
       scroll-behavior:smooth는 제거됨 (RAF가 담당). */
    overflow: hidden;
    align-items: stretch;
    justify-content: flex-start;
}

/* 좌우 데코 */
.prompter-deco {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 128px;
    background: rgba(255, 255, 0, 0.18);
    pointer-events: none;
    z-index: 0;
    transition: background 0.3s;
}

.prompter-deco--left {
    left: 0;
    border-radius: 0 999px 999px 0;
}

.prompter-deco--right {
    right: 0;
    border-radius: 999px 0 0 999px;
}

/* 가사 컨테이너 */
.prompter-lyrics-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 50vh 1rem;
    position: relative;
    z-index: 1;
}

/* 슬라이딩 하이라이트 마커 — 현재 줄 좌측의 노란 막대.
   줄 변경 시 top/height가 새 줄 위치로 transition. 스크롤과 함께 자연스럽게 움직임. */
.lyric-marker {
    position: absolute;
    left: 4%;
    width: 5px;
    background: #FFFF00;
    border-radius: 999px;
    box-shadow: 0 0 14px rgba(255, 255, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transform: translateZ(0); /* 컴포지터 레이어로 — 부드러운 transition */
    transition:
        top var(--prompter-transition, 400ms) cubic-bezier(0.4, 0, 0.2, 1),
        height var(--prompter-transition, 400ms) cubic-bezier(0.4, 0, 0.2, 1),
        opacity 200ms ease-out;
}
.lyric-marker.is-active { opacity: 0.9; }

/* 좌우 반전 모드에선 마커도 같이 반전됨 (scaleX(-1)이 컨테이너에 적용되니 자연스럽게) */

/* 가사 줄 기본 — 모든 상태에서 사이즈/letter-spacing 고정.
   상태 차이는 color · opacity · filter만 (출렁임·너비 변화 없음).
   조작은 키보드 전용 — 클릭 인터랙션 없음. */
.lyric-line {
    width: 90%;
    max-width: 1200px;
    text-align: center;
    transition:
        color var(--prompter-transition, 350ms) cubic-bezier(0.4, 0, 0.2, 1),
        opacity var(--prompter-transition, 350ms) cubic-bezier(0.4, 0, 0.2, 1),
        filter var(--prompter-transition, 350ms) cubic-bezier(0.4, 0, 0.2, 1);
    word-break: keep-all;
    font-size: calc(clamp(2.2rem, 8vh, 6rem) * var(--prompter-scale, 1));
    line-height: 1.25; /* 긴 줄이 자동으로 2줄 wrap 될 때 답답하지 않도록 */
    letter-spacing: -0.025em; /* 모든 상태 공통 */
    margin-bottom: 1.4vh;
    font-weight: 900;
    user-select: none;
    padding: 0.2em 0;
}

/* 빈 줄(간주) */
.lyric-line.is-empty {
    min-height: 4vh;
}

.lyric-line.is-empty::before {
    content: '·';
    opacity: 0.3;
}

/* 현재 줄 — 사이즈는 그대로, 색·글로우로만 강조 */
.lyric-current {
    color: #FFFF00;
    filter: drop-shadow(0 0 18px rgba(255, 255, 0, 0.35));
    opacity: 1;
}

/* ±1 줄 — 다음 줄 미리 읽기용으로 충분히 밝게 */
.lyric-near {
    color: #fff;
    opacity: 0.78;
}

/* +2 줄 — 룩어헤드 보조 */
.lyric-near-2 {
    color: #fff;
    opacity: 0.42;
}

/* 멀리 있는 줄 */
.lyric-far {
    color: #fff;
    opacity: 0.18;
}

/* 룩어헤드 1줄 모드: near-2 이후는 far처럼 */
.prompter-screen[data-lookahead="1"] .lyric-near-2 {
    opacity: 0.18;
}

/* 룩어헤드 3줄 모드: near-2도 더 밝게 */
.prompter-screen[data-lookahead="3"] .lyric-near-2 {
    opacity: 0.62;
}

/* === 섹션 마커 [Verse] [Chorus] 등 === */
.lyric-section {
    color: rgba(255, 255, 0, 0.55);
    font-family: 'Space Grotesk', 'NanumSquare', sans-serif;
    font-size: calc(clamp(0.85rem, 1.6vh, 1.2rem) * var(--prompter-scale, 1));
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    min-height: 3vh;
    margin-bottom: 1vh;
    opacity: 0.55;
    transform: none;
    cursor: default;
    pointer-events: none;
}
.lyric-section.lyric-current {
    color: rgba(255, 255, 0, 0.95);
    opacity: 1;
    filter: none;
    transform: none;
    letter-spacing: 0.18em;
}

/* 좌우 반전 */
.prompter-screen--stage[data-mirror="on"] .prompter-lyrics-container {
    transform: scaleX(-1);
}

/* 하단 컨트롤 안내 */
.prompter-bottom-bar {
    position: fixed;
    bottom: 28px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    pointer-events: none;
    z-index: 50;
}

.prompter-controls-hint {
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: rgba(255, 255, 255, 0.3);
    text-transform: uppercase;
    text-align: center;
    padding: 0 1rem;
}

/* === 설정 버튼 + 패널 === */
.prompter-settings-btn {
    top: 18px;
    right: 178px; /* FULLSCREEN 버튼(약 152px + 우측 18px) 좌측에 위치 */
    width: 38px;
    padding: 0.5rem 0;
    justify-content: center;
}
.prompter-settings-btn.is-active {
    color: #FFFF00;
    border-color: rgba(255, 255, 0, 0.5);
    background: rgba(255, 255, 0, 0.08);
}

@media (max-width: 768px) {
    .prompter-settings-btn {
        right: 76px; /* 모바일은 FULLSCREEN 텍스트 숨김으로 좁아짐 */
    }
}

.prompter-settings-panel {
    position: fixed;
    top: 70px;
    right: 18px;
    z-index: 60;
    width: 320px;
    max-width: calc(100vw - 36px);
    padding: 1.1rem 1.2rem 1rem;
    background: rgba(0, 0, 0, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    backdrop-filter: blur(12px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    animation: prompter-panel-in 0.18s ease-out;
}
.prompter-settings-panel[hidden] { display: none; }

@keyframes prompter-panel-in {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.prompter-settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.6);
}

.prompter-settings-close {
    width: 24px; height: 24px;
    padding: 0;
    border: none;
    background: rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.7rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s;
}
.prompter-settings-close:hover { background: rgba(255, 255, 255, 0.14); color: #fff; }

.prompter-settings-row {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.prompter-settings-label {
    font-size: 0.72rem;
    color: rgba(255, 255, 255, 0.55);
    letter-spacing: 0.02em;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}
.prompter-settings-label span {
    font-family: 'Space Grotesk', monospace;
    font-size: 0.78rem;
    color: rgba(255, 255, 0, 0.85);
    font-weight: 700;
}

.prompter-settings-segment {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    padding: 3px;
}
.prompter-settings-segment--4 {
    grid-template-columns: repeat(4, 1fr);
}

.prompter-settings-help {
    margin: -2px 0 0;
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.4);
    line-height: 1.4;
    letter-spacing: 0;
}

.prompter-seg {
    appearance: none;
    border: none;
    padding: 0.45rem 0.4rem;
    border-radius: 4px;
    background: transparent;
    color: rgba(255, 255, 255, 0.55);
    font-family: inherit;
    font-size: 0.74rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
    letter-spacing: -0.005em;
}
.prompter-seg:hover { color: #fff; background: rgba(255, 255, 255, 0.06); }
.prompter-seg.is-active {
    background: rgba(255, 255, 0, 0.14);
    color: rgba(255, 255, 0, 0.95);
    box-shadow: 0 0 0 1px rgba(255, 255, 0, 0.4);
}

.prompter-settings-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.85);
    cursor: pointer;
    user-select: none;
}
.prompter-settings-toggle input { accent-color: #FFFF00; }

.prompter-settings-hint {
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.35);
    margin: 0.2rem 0 0;
    line-height: 1.5;
    letter-spacing: 0.02em;
}
.prompter-settings-hint kbd {
    display: inline-block;
    padding: 1px 5px;
    margin: 0 1px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 3px;
    font-family: 'Space Grotesk', monospace;
    font-size: 0.62rem;
    color: rgba(255, 255, 255, 0.55);
}

/* 슬라이더 */
.prompter-settings-row input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 24px;
    background: transparent;
    cursor: pointer;
}
.prompter-settings-row input[type=range]:focus { outline: none; }
.prompter-settings-row input[type=range]::-webkit-slider-runnable-track {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 999px;
}
.prompter-settings-row input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px; height: 14px;
    border-radius: 50%;
    background: #FFFF00;
    margin-top: -5px;
    border: 2px solid #000;
    box-shadow: 0 0 6px rgba(255, 255, 0, 0.4);
}
.prompter-settings-row input[type=range]::-moz-range-track {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 999px;
}
.prompter-settings-row input[type=range]::-moz-range-thumb {
    width: 12px; height: 12px;
    border-radius: 50%;
    background: #FFFF00;
    border: 2px solid #000;
}

/* 시스템 상태 */
.prompter-system {
    position: fixed;
    bottom: 14px;
    left: 50%;
    transform: translateX(-50%);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.9rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 999px;
    color: rgba(255, 255, 255, 0.5);
    font-family: 'Space Grotesk', monospace;
    font-size: 0.62rem;
    letter-spacing: 0.1em;
    pointer-events: none;
    z-index: 50;
}

.prompter-system-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #FFFF00;
    box-shadow: 0 0 8px rgba(255, 255, 0, 0.6);
    animation: prompterPulse 2s ease-in-out infinite;
}

@keyframes prompterPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.85); }
}

/* === 반응형 === */
@media (max-width: 768px) {
    .prompter-corner-btn {
        padding: 0.4rem 0.7rem;
        font-size: 0.65rem;
    }
    .prompter-corner-btn span {
        display: none;
    }
    .prompter-input-area {
        font-size: 1rem;
        padding: 1.2rem;
    }
    .prompter-input-meta {
        font-size: 0.7rem;
        gap: 1rem;
        flex-wrap: wrap;
    }
    .prompter-bottom-bar {
        display: none;
    }
    .prompter-deco {
        height: 80px;
        width: 8px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .lyric-line { transition: none; }
    .prompter-system-dot { animation: none; }
}