/* ============================================
   우리의 별자리 — 프리미엄 디자인 시스템
   ============================================ */

/* 커스텀 프로퍼티 (컬러 시스템) */
:root {
    --color-bg: #08080d;
    --color-surface: rgba(12, 12, 20, 0.85);
    --color-surface-border: rgba(255, 255, 255, 0.06);
    --color-surface-hover: rgba(255, 255, 255, 0.08);
    --color-text: #fff8f0;
    --color-text-muted: rgba(255, 248, 240, 0.45);
    --color-text-dim: rgba(255, 248, 240, 0.28);
    --color-accent: #f4a261;
    --color-accent-warm: #ffd4a8;
    --color-accent-glow: rgba(244, 162, 97, 0.15);
    --color-glass-bg: rgba(14, 14, 22, 0.72);
    --color-glass-border: rgba(255, 255, 255, 0.08);
    --font-display: 'Cormorant Garamond', 'Georgia', serif;
    --font-body: 'Noto Sans KR', -apple-system, 'Segoe UI', sans-serif;
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

/* 리셋 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--color-bg);
    overflow: hidden;
    font-family: var(--font-body);
    color: var(--color-text);
    cursor: grab;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
body:active { cursor: grabbing; }

/* ── 캔버스 ── */
#scene {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
}

/* ============================================
   인트로 오버레이 — 시네마틱 연출
   ============================================ */
#intro-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: var(--color-bg);
    background-image:
        radial-gradient(ellipse at 30% 20%, rgba(255, 140, 107, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(100, 140, 255, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(255, 212, 168, 0.02) 0%, transparent 70%);
    background-size: 400% 400%;
    animation: introGradientShift 15s ease infinite;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 1.4s var(--ease-smooth);
}
#intro-overlay.fade-out {
    opacity: 0;
    pointer-events: none;
}

/* 인트로 파티클 배경 */
.intro-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}
.intro-particles .intro-dot {
    position: absolute;
    background: var(--color-accent);
    border-radius: 50%;
    animation: particleFloat 8s infinite ease-in-out;
}
.intro-particles .intro-dot::after {
    content: '';
    position: absolute;
    inset: -2px;
    background: inherit;
    border-radius: 50%;
    filter: blur(3px);
    opacity: 0.5;
}

@keyframes particleFloat {
    0%, 100% { opacity: 0; transform: translateY(0) scale(1); }
    20% { opacity: 0.6; }
    50% { opacity: 0.3; transform: translateY(-80px) scale(1.2); }
    80% { opacity: 0.5; }
}

/* 인트로 콘텐츠 */
.intro-content {
    text-align: center;
    position: relative;
    z-index: 2;
}

.intro-eyebrow {
    font-family: var(--font-display);
    font-size: clamp(0.75rem, 1.5vw, 0.95rem);
    font-weight: 300;
    font-style: italic;
    color: var(--color-accent);
    letter-spacing: 0.25em;
    margin-bottom: 1.8em;
    opacity: 0;
    animation: fadeUp 1.2s 0.2s var(--ease-out-expo) forwards;
}

.intro-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.1em;
    margin-bottom: 0.8em;
}
.intro-title-line {
    display: block;
    font-family: var(--font-body);
    font-size: clamp(2.2rem, 7vw, 4.5rem);
    font-weight: 300;
    letter-spacing: 0.35em;
    text-indent: 0.35em;
    opacity: 0;
    text-shadow: 0 0 40px rgba(255, 140, 107, 0.08);
}
.intro-title-line[data-delay="0"] {
    animation: introLineReveal 1.4s 0.5s var(--ease-out-expo) forwards;
}
.intro-title-line[data-delay="1"] {
    animation: introLineReveal 1.4s 0.8s var(--ease-out-expo) forwards;
}

@keyframes introLineReveal {
    from {
        opacity: 0;
        transform: translateY(30px);
        letter-spacing: 0.5em;
    }
    to {
        opacity: 1;
        transform: translateY(0);
        letter-spacing: 0.35em;
    }
}

.intro-sub {
    font-size: clamp(0.85rem, 2vw, 1.05rem);
    font-weight: 300;
    color: var(--color-text-muted);
    letter-spacing: 0.15em;
    margin-bottom: 1.5em;
    opacity: 0;
    animation: fadeUp 1.2s 1.2s var(--ease-out-expo) forwards;
}

.intro-dday {
    font-family: var(--font-display);
    font-size: clamp(0.8rem, 1.8vw, 1rem);
    font-weight: 300;
    color: var(--color-accent-warm);
    letter-spacing: 0.12em;
    margin-bottom: 2.5em;
    opacity: 0;
    animation: fadeUp 1.2s 1.5s var(--ease-out-expo) forwards;
}
.dday-number {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 1.15em;
    font-weight: 400;
    color: var(--color-text);
    margin: 0 0.08em;
    animation: ddayReveal 0.6s var(--ease-out-expo) backwards;
}
.intro-dday .dday-number:nth-of-type(1) { animation-delay: 1.6s; }
.intro-dday .dday-number:nth-of-type(2) { animation-delay: 1.7s; }
.intro-dday .dday-number:nth-of-type(3) { animation-delay: 1.8s; }
.intro-dday .dday-number:nth-of-type(4) { animation-delay: 1.9s; }

@keyframes ddayReveal {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.dday-unit {
    font-family: var(--font-body);
    font-size: 0.8em;
    font-weight: 300;
    color: var(--color-text-muted);
    margin-right: 0.3em;
}

/* 시작 버튼 */
#intro-start {
    position: relative;
    background: none;
    border: 1px solid rgba(255, 140, 107, 0.25);
    color: var(--color-text);
    padding: 0.9em 2.8em;
    font-family: var(--font-body);
    font-size: clamp(0.85rem, 1.5vw, 0.95rem);
    font-weight: 400;
    letter-spacing: 0.18em;
    cursor: pointer;
    border-radius: 3em;
    overflow: hidden;
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: all 0.6s var(--ease-smooth);
}
#intro-start.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
#intro-start::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-warm));
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}
#intro-start:hover {
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(255, 140, 107, 0.15);
}
#intro-start:hover::before {
    opacity: 0.12;
}
.btn-text { position: relative; }
.btn-arrow {
    display: inline-block;
    margin-left: 0.5em;
    transition: transform 0.3s var(--ease-spring);
}
#intro-start:hover .btn-arrow {
    transform: translateX(4px);
}

/* 인트로 하단 텍스트 */
.intro-bottom-text {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.72rem;
    color: var(--color-text-dim);
    letter-spacing: 0.12em;
    opacity: 0;
    animation: fadeUp 1s 2.5s var(--ease-out-expo) forwards;
}
.intro-bottom-text::after {
    content: '';
    display: block;
    width: 1px;
    height: 24px;
    background: linear-gradient(to bottom, var(--color-text-dim), transparent);
    margin: 0.8rem auto 0;
    animation: scrollIndicator 2s ease-in-out infinite;
}
@keyframes scrollIndicator {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 0.8; transform: scaleY(1.3); }
}

@keyframes introGradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── 비네트 효과 ── */
#vignette {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background: radial-gradient(ellipse at center, transparent 50%, rgba(0,0,0,0.4) 100%);
}

/* ============================================
   UI 오버레이 — 글래스모피즘 네비게이션
   ============================================ */
#ui-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    padding: 1.2rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.8s var(--ease-smooth);
}
#ui-overlay.visible { opacity: 1; }
#ui-overlay > * { pointer-events: auto; }

/* 모드 토글 */
#mode-toggle {
    display: flex;
    gap: 0;
    background: var(--color-glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 2.5em;
    overflow: hidden;
    border: 1px solid var(--color-glass-border);
}
.mode-btn {
    background: none;
    border: none;
    color: var(--color-text-muted);
    padding: 0.55em 1.4em;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.35s var(--ease-smooth);
    letter-spacing: 0.04em;
    position: relative;
}
.mode-btn.active {
    color: var(--color-text);
    background: rgba(255, 140, 107, 0.1);
}
.mode-btn:hover:not(.active) {
    color: rgba(255, 255, 255, 0.7);
    background: rgba(255, 255, 255, 0.04);
}

/* 뒤로가기 링크 */
#back-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 400;
    transition: all 0.3s ease;
    letter-spacing: 0.05em;
}
#back-link:hover {
    color: var(--color-accent-warm);
}

/* D-day 카운터 (UI 오버레이 내) */
#dday-counter {
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 300;
    color: var(--color-text-dim);
    letter-spacing: 0.08em;
    transition: color 0.3s ease;
}

/* ── 자동회전 토글 ── */
.rotate-btn {
    background: var(--color-glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--color-glass-border);
    color: var(--color-text-muted);
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}
.rotate-btn.active {
    color: var(--color-accent-warm);
    border-color: rgba(244, 162, 97, 0.3);
}
.rotate-btn.active .rotate-icon {
    animation: spin-slow 3s linear infinite;
}
@keyframes spin-slow {
    to { transform: rotate(360deg); }
}
.rotate-btn:hover {
    color: var(--color-text);
    border-color: rgba(255, 255, 255, 0.2);
}

/* ── 오디오 토글 ── */
.audio-btn {
    background: var(--color-glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--color-glass-border);
    color: var(--color-text-muted);
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}
.audio-btn:hover {
    color: var(--color-text);
    background: var(--color-surface-hover);
}
.audio-btn.active {
    color: var(--color-accent);
    border-color: var(--color-accent-glow);
}
.audio-icon {
    transition: transform 0.3s var(--ease-spring);
}
.audio-btn.active .audio-icon {
    animation: audioWave 1.5s ease-in-out infinite;
}
@keyframes audioWave {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

/* ── 투어 내레이션 ── */
#tour-narration {
    position: fixed;
    top: 5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 25;
    font-family: var(--font-body);
    font-size: clamp(0.85rem, 2vw, 1rem);
    font-weight: 300;
    color: var(--color-text);
    text-align: center;
    letter-spacing: 0.08em;
    opacity: 0;
    transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
    pointer-events: none;
    max-width: 80vw;
    text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
#tour-narration.visible {
    opacity: 1;
}
#tour-narration.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(-8px);
}
#tour-narration .narration-number {
    display: block;
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--color-accent);
    letter-spacing: 0.2em;
    margin-bottom: 0.5em;
}

/* ============================================
   여정 진행 사이드바
   ============================================ */
#journey-progress {
    position: fixed;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.8s var(--ease-smooth);
}
#journey-progress.visible {
    opacity: 1;
}
#journey-progress.hidden {
    opacity: 0;
    pointer-events: none;
}

.journey-line {
    position: absolute;
    top: 0;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    background: linear-gradient(
        to bottom,
        transparent,
        var(--color-glass-border) 10%,
        var(--color-glass-border) 90%,
        transparent
    );
}

.journey-dots {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    position: relative;
    z-index: 1;
}
.journey-dots .journey-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-text-dim);
    border: 1px solid transparent;
    transition: all 0.4s var(--ease-spring);
    cursor: pointer;
    pointer-events: auto;
    position: relative;
}
/* 넓은 히트 영역 (마우스 가까이 오면 자동 호버) */
.journey-dots .journey-dot::before {
    content: '';
    position: absolute;
    top: -14px;
    left: -14px;
    right: -14px;
    bottom: -14px;
    border-radius: 50%;
}
.journey-dots .journey-dot:hover {
    background: var(--color-accent-warm);
    transform: scale(1.6);
}
.journey-dots .journey-dot .journey-tooltip {
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-surface);
    border: 1px solid var(--color-surface-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 0.35rem 0.65rem;
    border-radius: 6px;
    font-size: 0.7rem;
    color: var(--color-text);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.journey-dots .journey-dot:hover .journey-tooltip {
    opacity: 1;
}
.journey-dots .journey-dot.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    box-shadow: 0 0 12px var(--color-accent-glow);
    transform: scale(1.4);
}
.journey-dots .journey-dot.visited {
    background: var(--color-accent-warm);
    opacity: 0.6;
}

.journey-label {
    margin-top: 1.2rem;
    font-size: 0.65rem;
    color: var(--color-text-dim);
    letter-spacing: 0.08em;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    white-space: nowrap;
}

/* ============================================
   장소 정보 패널 — 글래스모피즘 카드
   ============================================ */
#info-panel {
    position: fixed;
    right: 1.5rem;
    bottom: 1.5rem;
    z-index: 30;
    background: var(--color-glass-bg);
    backdrop-filter: blur(24px) saturate(1.2);
    -webkit-backdrop-filter: blur(24px) saturate(1.2);
    border: 1px solid var(--color-glass-border);
    border-radius: 1.2rem;
    padding: 1.8rem;
    max-width: 400px;
    width: calc(100vw - 3rem);
    transform: translateY(24px) scale(0.97);
    opacity: 0;
    transition: all 0.5s var(--ease-spring);
}
#info-panel.visible {
    transform: translateY(0) scale(1);
    opacity: 1;
    border-color: rgba(255, 140, 107, 0.12);
}
#info-panel.visible::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 1.5rem;
    right: 70%;
    height: 1px;
    background: linear-gradient(to right, var(--color-accent), transparent);
    opacity: 0.4;
}
#info-panel.hidden { pointer-events: none; }

/* 닫기 버튼 */
#info-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--color-text-dim);
    font-size: 1.3rem;
    cursor: pointer;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.25s ease;
}
#info-close:hover {
    color: var(--color-text);
    background: var(--color-surface-hover);
    transform: rotate(90deg);
}

/* 패널 헤더 */
.info-header {
    margin-bottom: 1rem;
}
.info-location-icon {
    font-size: 0.8rem;
    color: var(--color-accent);
    margin-bottom: 0.6rem;
    opacity: 0.8;
}
#info-date {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 300;
    font-style: italic;
    color: var(--color-text-muted);
    letter-spacing: 0.12em;
    margin-bottom: 0.4rem;
}
#info-title {
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    line-height: 1.4;
}

/* 구분선 */
.info-divider {
    width: 2rem;
    height: 1px;
    background: linear-gradient(to right, var(--color-accent), transparent);
    margin-bottom: 1rem;
    opacity: 0.4;
}

/* 설명 */
#info-desc {
    font-size: 0.82rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.75;
    margin-bottom: 1.2rem;
}

/* 사진 그리드 — 스태거 등장 */
#info-photos {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
    gap: 6px;
}
#info-photos img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 8px;
    cursor: pointer;
    opacity: 0;
    transform: scale(0.9);
    animation: photoReveal 0.5s var(--ease-spring) forwards;
    transition: transform 0.3s var(--ease-spring), box-shadow 0.3s ease;
}
#info-photos img:nth-child(1) { animation-delay: 0.05s; }
#info-photos img:nth-child(2) { animation-delay: 0.1s; }
#info-photos img:nth-child(3) { animation-delay: 0.15s; }
#info-photos img:nth-child(4) { animation-delay: 0.2s; }
#info-photos img:nth-child(5) { animation-delay: 0.25s; }
#info-photos img:nth-child(6) { animation-delay: 0.3s; }
#info-photos img:nth-child(7) { animation-delay: 0.35s; }
#info-photos img:nth-child(8) { animation-delay: 0.4s; }

@keyframes photoReveal {
    to {
        opacity: 0.88;
        transform: scale(1);
    }
}

#info-photos img:hover {
    transform: scale(1.06);
    opacity: 1;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    z-index: 1;
    position: relative;
}

/* 패널 푸터 */
.info-footer {
    margin-top: 1rem;
    padding-top: 0.8rem;
    border-top: 1px solid var(--color-surface-border);
}
#info-photo-count {
    font-size: 0.7rem;
    color: var(--color-text-dim);
    letter-spacing: 0.08em;
}

/* ============================================
   라이트박스 — 풀스크린 뷰어
   ============================================ */
#lb {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.4s var(--ease-smooth);
}
#lb.hidden {
    opacity: 0;
    pointer-events: none;
}
#lb-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(4, 4, 8, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}
#lb-img-wrap {
    position: relative;
    z-index: 1;
    max-width: 90vw;
    max-height: 85vh;
    animation: lbReveal 0.4s var(--ease-out-expo) forwards;
}
@keyframes lbReveal {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}
#lb-img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: 6px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transition: opacity 0.2s ease, transform 0.2s ease;
}
#lb-img.lb-transitioning {
    opacity: 0;
    transform: scale(0.97);
}

/* 라이트박스 컨트롤 */
#lb-close, #lb-prev, #lb-next {
    position: absolute;
    z-index: 2;
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.25s ease;
}
#lb-close:hover, #lb-prev:hover, #lb-next:hover {
    color: var(--color-text);
}
#lb-close {
    top: 1.2rem;
    right: 1.2rem;
    font-size: 1.8rem;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}
#lb-close:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: rotate(90deg);
}
#lb-prev {
    left: 1.2rem;
    top: 50%;
    font-size: 2.5rem;
    transform: translateY(-50%);
    padding: 0.5em;
}
#lb-prev:hover { transform: translateY(-50%) translateX(-3px); }
#lb-next {
    right: 1.2rem;
    top: 50%;
    font-size: 2.5rem;
    transform: translateY(-50%);
    padding: 0.5em;
}
#lb-next:hover { transform: translateY(-50%) translateX(3px); }
#lb-counter {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 300;
    color: var(--color-text-muted);
    letter-spacing: 0.15em;
    background: var(--color-glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 0.3em 1em;
    border-radius: 2em;
    border: 1px solid var(--color-glass-border);
}

/* ============================================
   마커 툴팁
   ============================================ */
#marker-tooltip {
    position: fixed;
    z-index: 25;
    background: var(--color-glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--color-glass-border);
    border-radius: 0.6rem;
    padding: 0.4em 0.8em;
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-text);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.15s ease;
    white-space: nowrap;
}
#marker-tooltip.hidden {
    opacity: 0;
    transform: translateY(4px);
}
#marker-tooltip .tooltip-date {
    font-family: var(--font-display);
    font-size: 0.65rem;
    color: var(--color-text-muted);
    display: block;
    margin-bottom: 0.15em;
}
#marker-tooltip .tooltip-hint {
    font-size: 0.6rem;
    color: var(--color-accent);
    opacity: 0.8;
    animation: tooltipHintPulse 1.5s ease-in-out infinite;
}
@keyframes tooltipHintPulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* ============================================
   힌트 텍스트
   ============================================ */
#hint {
    position: fixed;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    font-size: 0.75rem;
    font-weight: 300;
    color: var(--color-text-dim);
    letter-spacing: 0.12em;
    opacity: 0;
    transition: opacity 1.2s var(--ease-smooth);
    pointer-events: none;
}
#hint.visible {
    opacity: 1;
    animation: hintPulse 3s 1s ease-in-out infinite;
}

@keyframes hintPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ============================================
   키보드 단축키 안내
   ============================================ */
#shortcuts-hint {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 40;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 1rem;
    padding: 1rem 1.5rem;
    transition: opacity 0.3s, transform 0.3s;
}
#shortcuts-hint.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) translateY(10px);
}
.shortcuts-content {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
}
.shortcut-item {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.5);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
kbd {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 4px;
    padding: 0.15em 0.4em;
    font-size: 0.7rem;
    font-family: inherit;
    color: rgba(255,255,255,0.7);
}

/* ============================================
   반응형 — 태블릿
   ============================================ */
@media (max-width: 768px) {
    #info-panel {
        right: 0.75rem;
        bottom: 0.75rem;
        width: calc(100vw - 1.5rem);
        max-width: none;
        padding: 1.4rem;
        border-radius: 1rem;
    }
    #info-photos {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    }
    #ui-overlay {
        padding: 0.8rem 1rem;
    }
    .mode-btn {
        padding: 0.45em 1em;
        font-size: 0.75rem;
    }
    #journey-progress {
        left: 0.8rem;
    }
    .journey-label {
        display: none;
    }
    .intro-bottom-text {
        bottom: 1.5rem;
        font-size: 0.65rem;
    }
}

/* ============================================
   반응형 — 모바일
   ============================================ */
@media (max-width: 480px) {
    #info-panel {
        right: 0;
        bottom: 0;
        width: 100vw;
        border-radius: 1rem 1rem 0 0;
        padding: 1.2rem 1rem;
        max-height: 55vh;
        overflow-y: auto;
    }
    #info-photos {
        grid-template-columns: repeat(auto-fill, minmax(52px, 1fr));
        gap: 4px;
    }
    #ui-overlay {
        padding: 0.6rem 0.8rem;
        flex-wrap: wrap;
        gap: 0.4rem;
    }
    #mode-toggle {
        order: 1;
        width: 100%;
        justify-content: center;
        border-radius: 2em;
    }
    #back-link {
        order: 0;
        font-size: 0.72rem;
    }
    #dday-counter {
        order: 0;
        font-size: 0.68rem;
    }
    .mode-btn {
        padding: 0.35em 0.65em;
        font-size: 0.68rem;
    }
    .rotate-btn, .audio-btn {
        width: 1.8rem;
        height: 1.8rem;
        font-size: 0.75rem;
    }
    #journey-progress {
        display: none;
    }
    .intro-title-line {
        font-size: clamp(1.8rem, 10vw, 2.5rem);
    }
    .intro-eyebrow {
        font-size: 0.7rem;
    }
    #lb-prev { left: 0.5rem; font-size: 2rem; }
    #lb-next { right: 0.5rem; font-size: 2rem; }
    #lb-close { top: 0.8rem; right: 0.8rem; }
}

/* ============================================
   모바일 터치 최적화
   ============================================ */
@media (hover: none) and (pointer: coarse) {
    .mode-btn {
        min-height: 44px;
        min-width: 44px;
    }
    #info-close {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.5rem;
    }
    #lb-prev, #lb-next {
        padding: 1em;
    }
    .journey-dot {
        width: 10px;
        height: 10px;
    }
    /* 터치 시 호버 효과 방지 */
    .mode-btn:hover:not(.active) {
        color: var(--color-text-muted);
        background: none;
    }
}

/* ============================================
   로딩 인디케이터 — 인터랙티브 Canvas
   ============================================ */
.intro-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    margin-top: 2rem;
    opacity: 0;
    animation: fadeUp 0.6s 2.5s ease forwards;
}
#loading-canvas {
    width: 120px;
    height: 120px;
    cursor: pointer;
}
.loading-status {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}
.loading-bar-track {
    width: 140px;
    height: 2px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 1px;
    overflow: hidden;
}
.loading-bar-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-warm));
    border-radius: 1px;
    transition: width 0.3s ease;
}
.loading-text {
    font-family: var(--font-body);
    font-size: 0.7rem;
    color: var(--color-text-dim);
    letter-spacing: 0.06em;
    transition: opacity 0.2s ease;
}
.loading-text.loading-complete {
    color: var(--color-accent);
    font-weight: 400;
}

/* 로딩 완료 시 바 글로우 */
.intro-loading.complete .loading-bar-fill {
    box-shadow: 0 0 8px rgba(244, 162, 97, 0.6);
}
.intro-loading.complete #loading-canvas {
    opacity: 0;
    transition: opacity 0.5s ease;
}

/* 시작 버튼 준비 펄스 */
#intro-start.ready-pulse {
    animation: readyPulse 1.8s ease-in-out infinite;
}
@keyframes readyPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(244, 162, 97, 0.3); }
    50% { box-shadow: 0 0 20px 4px rgba(244, 162, 97, 0.25); }
}

/* ============================================
   접근성 — 모션 감소 선호
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .intro-title-line,
    .intro-eyebrow,
    .intro-sub,
    .intro-dday,
    #intro-start,
    .intro-bottom-text {
        opacity: 1 !important;
        transform: none !important;
    }
    #info-photos img {
        opacity: 0.88 !important;
        transform: none !important;
    }
    .intro-particles .intro-dot {
        display: none;
    }
}