/* 기본 & 배경 */
:root {
    --bg-gradient-start: #1B2735;
    --bg-gradient-end: #090A0F;
    --text-color: #e0e0e0;
    --glow-color-1: rgba(200, 220, 255, 0.6);
    --glow-color-2: rgba(180, 200, 255, 0.4);
    --nebula-color-1: rgba(120, 150, 255, 0.25);
    --nebula-color-2: rgba(200, 100, 200, 0.2);
}

body[data-theme="nebula"] {
    --bg-gradient-start: #2c1a4d;
    --bg-gradient-end: #1f1137;
    --text-color: #f0e8ff;
    --glow-color-1: rgba(224, 188, 255, 0.7);
    --glow-color-2: rgba(198, 148, 255, 0.5);
    --nebula-color-1: rgba(180, 120, 255, 0.3);
    --nebula-color-2: rgba(255, 100, 150, 0.25);
}

body[data-theme="supernova"] {
    --bg-gradient-start: #4d1a1a;
    --bg-gradient-end: #371111;
    --text-color: #fff0e8;
    --glow-color-1: rgba(255, 224, 188, 0.7);
    --glow-color-2: rgba(255, 198, 148, 0.5);
    --nebula-color-1: rgba(255, 180, 120, 0.3);
    --nebula-color-2: rgba(255, 150, 100, 0.25);
}

body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Segoe UI', 'Roboto', sans-serif;
}

.cosmic-background {
    position: relative;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at bottom, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    overflow: hidden;
}

/* 별 & 성운 & 별똥별 (색상 변수 적용) */
.stars-small,
.stars-medium,
.stars-large {
    position: absolute;
    top: 0;
    left: 0;
    width: 1px;
    height: 1px;
    background: transparent;
    border-radius: 50%;
    animation: animStar 150s linear infinite;
    /* z-index: 2; 성운보다 높은 z-index */
    transition: transform 0.5s ease-out; /* 이 줄을 추가 */
}

.stars-small::after,
.stars-medium::after,
.stars-large::after {
    content: " ";
    position: absolute;
    top: 0;
    left: 2000px;
    width: 1px;
    height: 1px;
    background: transparent;
    border-radius: 50%;
}

.stars-medium,
.stars-medium::after {
    width: 2px;
    height: 2px;
    animation-duration: 200s;
    /* z-index: 3; */
}

.stars-large,
.stars-large::after {
    width: 3px;
    height: 3px;
    animation-duration: 250s;
    /* z-index: 4; */
}

@keyframes animStar {
    from {
        transform: translateX(0);
    }

    to {
        transform: translateX(-2000px);
    }
}

.nebula-layer {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    /* background: radial-gradient(ellipse at 90% 10%, var(--nebula-color-1) 0%, transparent 60%), radial-gradient(ellipse at 10% 90%, var(--nebula-color-2) 0%, transparent 50%), radial-gradient(ellipse at center, rgba(255, 255, 255, 0.05) 0%, transparent 80%); */
    mix-blend-mode: screen;
    animation: move-nebula 60s linear infinite alternate;
    opacity: 0.7; /* 성운이 너무 강렬하지 않도록 투명도 조절 */
    /* z-index: 1; 은하수보다 높은 z-index */
}

@keyframes move-nebula {
    from {
        transform: scale(2.5) rotate(0deg);
        opacity: 0.8;
    }

    to {
        transform: scale(2.8) rotate(360deg);
        opacity: 1;
    }
}

/* 1. 은하수 (가장 뒤) */
#milky-way-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    display: none;
    /* z-index: 0; 가장 낮은 z-index */
}

.shooting-star {
    position: absolute;
    width: 2px;
    height: 2px;
    border-radius: 50%;
    background-color: #fff;
    opacity: 0;
    /* animation 속성을 분리하고 animation-duration에 CSS 변수 사용 */
    animation-name: shooting-star-fall;
    animation-timing-function: linear;
    animation-duration: var(--shooting-star-duration);
}

.shooting-star::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #fff;
    box-shadow: 0 0 10px 2px #fff, 0 0 20px 5px rgba(255, 255, 255, 0.5);
    animation: shooting-star-glow 1.5s ease-in-out infinite alternate;
}

.shooting-star::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150px;
    height: 2px;
    background: linear-gradient(to left, transparent, #fff);
    transform-origin: 0% 50%;
    transform: translateY(-50%) rotate(295deg);
    filter: blur(1px);
}

@keyframes shooting-star-fall {
    0% {
        transform: translate(0, 0);
        opacity: 1;
    }

    95% {
        opacity: 1;
    }

    100% {
        transform: translate(-40vw, 120vh);
        opacity: 0;
    }
}

@keyframes shooting-star-glow {
    0% {
        transform: translate(-50%, -50%) scale(0.8);
        box-shadow: 0 0 8px 1px #fff, 0 0 16px 4px rgba(255, 255, 255, 0.4);
    }

    100% {
        transform: translate(-50%, -50%) scale(1.2);
        box-shadow: 0 0 12px 3px #fff, 0 0 24px 6px rgba(255, 255, 255, 0.6);
    }
}

/* 중앙 정보 클러스터 */
#clock-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-color);
    text-align: center;
    text-shadow: 0 0 8px var(--glow-color-1), 0 0 12px var(--glow-color-2);
    pointer-events: none;
    animation: fadeInClock 3s ease;
    transition: opacity 0.5s ease;
}

#info-cluster {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    min-height: 24px;
    margin-bottom: 10px;
    opacity: 0.8;
}

#moon-phase-display {
    font-size: 1.5rem;
}

#quote-display {
    font-size: 0.9rem;
    font-style: italic;
    max-width: 400px;
}

#date-display {
    font-size: 1.2rem;
    letter-spacing: 2px;
}

#time-display {
    font-size: 3.5rem;
    font-weight: 300;
    letter-spacing: 4px;
    margin-top: 5px;
}

@keyframes fadeInClock {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

#toggle-clock-btn {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    padding: 5px 15px;
    border-radius: 20px;
    cursor: pointer;
    margin-top: 20px;
    font-size: 0.8rem;
    letter-spacing: 1px;
    pointer-events: all;
    text-shadow: 0 0 5px var(--glow-color-1);
}

#toggle-clock-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 10px var(--glow-color-2);
}

#clock-container.hidden {
    opacity: 0;
    pointer-events: none;
}

/* UFO & 행성 & 효과 */
.ufo {
    position: absolute;
    width: 42px;
    height: 30px;
    top: 0;
    left: 0;
    animation-name: fly-ufo;
    animation-duration: 30s;
    animation-timing-function: linear;
    animation-iteration-count: 1;
    animation-fill-mode: forwards;
    opacity: 0;
    pointer-events: all;
    cursor: pointer;
    transition: transform 0.2s ease-out;
    /* display: none; JS로 제어 */
}

.ufo.flash {
    filter: brightness(2) drop-shadow(0 0 5px white);
}

.ufo-cockpit {
    position: absolute;
    width: 20px;
    height: 10px;
    background-color: #87ceeb;
    border-radius: 10px 10px 0 0;
    top: 0;
    left: 11px;
    border-top: 2px solid #e0e0e0;
    border-left: 2px solid #e0e0e0;
    border-right: 2px solid #e0e0e0;
    box-shadow: inset 0 2px 5px rgba(255, 255, 255, 0.5);
}

.ufo-base {
    position: absolute;
    width: 40px;
    height: 20px;
    background-color: #c0c0c0;
    border-radius: 50%;
    top: 8px;
    left: 1px;
    box-shadow: inset 0 -4px 6px rgba(0, 0, 0, 0.3), 0 5px 10px rgba(0, 0, 0, 0.4);
}

.ufo-base::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background-color: #ffeb3b;
    border-radius: 50%;
    bottom: -3px;
    left: 17px;
    box-shadow: 0 0 8px #ffeb3b, 0 0 16px #ffeb3b;
    animation: blink-light 2s infinite;
}

@keyframes blink-light {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(0.8);
    }
}

.spaceship-trail {
    position: absolute;
    width: 4px;
    height: 4px;
    background-color: rgba(187, 247, 208, 0.5);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(187, 247, 208, 0.4);
    pointer-events: none;
    animation: fadeOutTrail 1.5s ease-out forwards;
}

@keyframes fadeOutTrail {
    to {
        transform: scale(0.3);
        opacity: 0;
    }
}

/* .planet {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    opacity: 0;
    box-shadow: -10px -10px 20px rgba(255, 255, 255, 0.1) inset, 0 0 40px rgba(255, 230, 200, 0.2);
    /* background-color: #8a5a44; */
    /* background-image: radial-gradient(circle at 30% 30%, #d4a373, #8a5a44); */
/* } */

@keyframes drift-planet {
    from {
        transform: translate(-150%, 0);
        opacity: 1;
    }

    to {
        transform: translate(1200%, 0);
        opacity: 1;
    }
}

/* [추가] ISS 추적기 스타일 */
#iss-tracker {
    position: absolute;
    font-size: 1.5rem;
    text-shadow: 0 0 10px white, 0 0 20px cyan;
    /* opacity: 0; 이 줄을 추가하세요 */
    cursor: pointer;
    /* transition: top 5s linear, left 5s linear; 부드러운 이동 */
    display: none; /* JS로 제어 */
}

#black-hole-effect {
    position: absolute;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, transparent 20%, #111 50%, #222 100%);
    box-shadow: 0 0 10px 5px #6a0dad, 0 0 20px 10px #4b0082;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
}

#black-hole-effect.active {
    animation: black-hole-anim 1.5s ease-out;
}

@keyframes black-hole-anim {
    0% {
        transform: translate(-50%, -50%) scale(0);
        opacity: 1;
    }

    50% {
        transform: translate(-50%, -50%) scale(1.2);
    }

    100% {
        transform: translate(-50%, -50%) scale(0);
        opacity: 0;
    }
}

.black-hole-particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: 50%;
    pointer-events: none;
}

/* 기존 @keyframes pull-to-black-hole 삭제 후 아래 코드로 대체 */
@keyframes pull-to-center {
    from {
        transform: translate(0, 0) scale(1);
        opacity: 0.8;
    }

    to {
        transform: translate(var(--delta-x), var(--delta-y)) scale(0);
        opacity: 0;
    }
}

/* 설정 패널 */
#settings-toggle-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1001;
    opacity: 0.7;
    transition: opacity 0.3s, transform 0.3s;
}

#settings-toggle-btn:hover {
    opacity: 1;
    transform: rotate(45deg);
}

#settings-panel {
    position: fixed;
    bottom: 60px;
    right: 20px;
    background-color: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    padding: 15px;
    z-index: 1000;
    color: var(--text-color);
    width: 200px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    transform: translateY(20px) scale(0.95);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    pointer-events: none;
}

#settings-panel.visible {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: all;
}

.settings-header {
    font-weight: bold;
    margin-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding-bottom: 5px;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.theme-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 5px;
}

.theme-btn {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    padding: 5px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.8rem;
}

.theme-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.switch {
    position: relative;
    display: inline-block;
    width: 34px;
    height: 20px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 20px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 12px;
    width: 12px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked+.slider {
    background-color: #87ceeb;
}

input:checked+.slider:before {
    transform: translateX(14px);
}

/* 행성 기본 스타일 */
.planet {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    opacity: 0;
    cursor: pointer;
    transform-style: preserve-3d;
}

/* 행성 표면 (가상요소로 분리하여 안정성 확보) */
.planet::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    z-index: 2; /* 고리 사이에 위치 */
    background-color: var(--planet-base-color);
    background-image: var(--planet-gradient);
    box-shadow: -10px -10px 20px rgba(255, 255, 255, 0.1) inset, 0 0 40px rgba(255, 230, 200, 0.2);
}

/* 행성 위에 표시될 동반자 요소 컨테이너 */
#planet-companion-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3; /* 행성 표면 위에 위치 */
}

/* 개별 동반자 요소 스타일 (SVG를 담을 div) */
.planet-companion {
    position: absolute;
    width: 35px; /* 아이콘 크기 기준 */
    height: 35px; /* 아이콘 크기 기준 */
    transform: translate(-50%, -50%); /* 정확한 중앙 정렬을 위해 수정 */
    filter: drop-shadow(0px 2px 2px rgba(0,0,0,0.5));
}

/* 컨테이너 안의 SVG가 꽉 차도록 설정 */
.planet-companion svg {
    width: 100%;
    height: 100%;
}

/* 행성 및 ISS 정보창 스타일 */
.planet.is-scanning,
#iss-tracker.is-showing-info {
    pointer-events: none; /* 정보창 표시 중 중복 클릭 방지 */
}

.scan-line {
    position: absolute;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 5;
    background: radial-gradient(ellipse at center, rgba(135, 206, 250, 1) 0%, rgba(135, 206, 250, 0) 70%);
    box-shadow: 0 0 10px 2px skyblue;
    border-radius: 50%;
    opacity: 0;
    animation: scan-anim 1.5s ease-out;
}

@keyframes scan-anim {
    0% { top: 0%; opacity: 1; }
    90% { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}

.planet-info, .celestial-info {
    position: fixed; /* 화면 기준 위치 고정 */
    background-color: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(135, 206, 250, 0.5);
    border-radius: 8px;
    padding: 10px 15px;
    color: #e0e0e0;
    font-size: 0.9rem;
    z-index: 100;
    text-shadow: 0 0 5px skyblue;
    animation: info-fade 4s ease-out;
    opacity: 0; /* 애니메이션이 끝나면 사라짐 */
}

@keyframes info-fade {
    0% { transform: translateY(20px); opacity: 0; }
    20% { transform: translateY(0); opacity: 1; }
    80% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(-20px); opacity: 0; }
}

/* 워프 게이지 및 인용구 창 스타일 */
#warp-effect-container {
    position: fixed;
    z-index: 9999;
    pointer-events: none; /* 클릭 방지 */
    opacity: 0;
    transition: opacity 0.3s ease;
}

#warp-quote-window {
    padding: 10px;
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid #00d4ff;
    color: #00d4ff;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    text-shadow: 0 0 5px #00d4ff;
    margin-bottom: 10px;
}

#warp-gauge-container {
    width: 100%;
    height: 5px;
    border: 1px solid #00d4ff;
    border-radius: 3px;
    padding: 1px;
}

#warp-gauge-bar {
    width: 0%;
    height: 100%;
    background-color: #00d4ff;
    border-radius: 2px;
    transition: width 2s linear; /* 2초 동안 게이지가 참 */
}

/* --- 개선된 워프 효과 스타일 --- */
.warp-line {
    position: fixed; /* 뷰포트 기준 위치 고정 */
    background: white;
    height: 1px; /* 라인 두께 */
    width: var(--line-length); /* JS에서 계산된 라인 길이 */
    transform-origin: left center; /* 왼쪽 중앙을 기준으로 변형 */
    opacity: 0; /* 기본적으로 보이지 않음 */
    pointer-events: none;
    /* 애니메이션 속성은 JS에서 직접 설정됩니다. */
}

@keyframes warp-stretch {
    0% {
        /* 시작: 빈 공간 외부에서 작은 크기로 나타남 */
        transform: rotate(var(--angle)) translateX(var(--start-dist)) scaleX(0.1);
        opacity: 0;
    }
    30% {
        /* 빠르게 나타나도록 중간에 투명도 1 설정 */
        opacity: 1;
    }
    100% {
        /* 종료: 바깥쪽으로 뻗어 나가면서 사라짐 */
        transform: rotate(var(--angle)) translateX(var(--end-dist)) scaleX(1);
        opacity: 0;
    }
}