/* ============================================================
   月球漫步者 · 夜空主题 + 明亮儿童卡片
   ============================================================ */

body {
    background:
        radial-gradient(ellipse at 20% -10%, rgba(197, 163, 255, 0.25), transparent 55%),
        radial-gradient(ellipse at 90% 10%, rgba(160, 216, 241, 0.2), transparent 55%),
        linear-gradient(to bottom, #0c0c1e 0%, #1a1a3e 55%, #2d2456 100%);
    min-height: 100vh;
    color: var(--text-1);
    overflow-x: hidden;
    font-family: var(--font-body);
}

/* 星空 */
.stars {
    position: fixed; inset: 0; pointer-events: none; z-index: 0;
}
.stars span {
    position: absolute;
    background: #fff;
    border-radius: 50%;
    animation: twinkle 3s ease-in-out infinite;
}
@keyframes twinkle {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50%      { opacity: 1;   transform: scale(1.3); }
}

/* 极光氛围 */
.aurora {
    position: fixed; inset: 0; pointer-events: none; z-index: 0;
    background:
        radial-gradient(circle at 15% 80%, rgba(168, 230, 207, 0.12), transparent 40%),
        radial-gradient(circle at 85% 70%, rgba(255, 180, 162, 0.10), transparent 40%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 90px 20px 60px;
    position: relative;
    z-index: 1;
}

/* 标题 */
.page-header { text-align: center; margin-bottom: 32px; }
.title {
    font-size: clamp(2rem, 5vw, 3rem);
    color: #fff;
    text-shadow: 0 0 24px rgba(255, 213, 107, 0.5), 0 4px 20px rgba(0,0,0,0.3);
    margin: 0 0 8px;
}
.subtitle {
    color: #d6d3e7;
    font-size: 1.05rem;
    margin: 0;
}

/* 卡片基础（覆盖夜空场景下的对比） */
.card {
    background: var(--bg-card);
    border-radius: var(--r-lg);
    border: 2px solid var(--border);
    padding: 22px;
    box-shadow: var(--shadow-lg), 0 6px 0 rgba(60, 40, 100, 0.25);
}
.card-title {
    color: var(--text-1);
    margin: 0 0 8px;
    font-size: 1.25rem;
}
.card-title .hint-inline {
    font-size: 0.75rem;
    color: var(--text-3);
    font-weight: 500;
    margin-left: 8px;
}
.card-hint {
    color: var(--text-2);
    font-size: 0.9rem;
    margin: 0 0 14px;
}

/* 主视图区 */
.main-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 22px;
    margin-bottom: 22px;
}
@media (max-width: 900px) { .main-view { grid-template-columns: 1fr; } }

.view-card { display: flex; flex-direction: column; }

/* 太空视图（保留夜空感） */
.space-view {
    position: relative;
    height: 380px;
    background:
        radial-gradient(ellipse at center, #1a1a3e 0%, #0a0a1a 100%);
    border-radius: var(--r-md);
    overflow: hidden;
    border: 2px solid #2a2354;
}

.sun {
    position: absolute;
    left: -60px; top: 50%;
    transform: translateY(-50%);
    width: 120px; height: 120px;
    background: radial-gradient(circle, #fff700 0%, #ff8c00 70%, #ff4500 100%);
    border-radius: 50%;
    box-shadow: 0 0 60px #ff8c00, 0 0 100px #ff4500;
}
.sun-rays {
    position: absolute;
    left: -60px; top: 50%;
    transform: translateY(-50%);
    width: 120px; height: 120px;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { transform: translateY(-50%) scale(1); }
    50%      { transform: translateY(-50%) scale(1.1); }
}
.light-rays {
    position: absolute; top: 0; left: 60px;
    width: calc(100% - 60px); height: 100%;
    background: linear-gradient(to right, rgba(255, 200, 50, 0.1) 0%, transparent 100%);
    pointer-events: none;
}
.earth {
    position: absolute;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    width: 80px; height: 80px;
    background: radial-gradient(circle at 30% 30%, #6db0ff 0%, #1e5799 60%, #0d2d52 100%);
    border-radius: 50%;
    box-shadow: inset -10px -10px 20px rgba(0,0,0,0.5), 0 0 24px rgba(74,144,217,0.6);
    display: flex; align-items: center; justify-content: center;
    font-size: 26px;
}
.earth-label { filter: drop-shadow(0 0 4px #000); }
.moon-orbit {
    position: absolute;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    width: 280px; height: 280px;
    border: 2px dashed rgba(255, 213, 107, 0.35);
    border-radius: 50%;
    pointer-events: none;
}
.moon {
    position: absolute;
    width: 44px; height: 44px;
    background: radial-gradient(circle at 35% 35%, #fff 0%, #e8e8e8 50%, #b8b8c8 100%);
    border-radius: 50%;
    cursor: grab;
    box-shadow: 0 0 24px rgba(255,255,255,0.6), inset -6px -6px 10px rgba(80,80,100,0.4);
    transition: box-shadow 0.2s, transform 0.2s;
    touch-action: none;
    user-select: none;
}
.moon:hover { box-shadow: 0 0 36px rgba(255,255,255,0.9), inset -6px -6px 10px rgba(80,80,100,0.4); }
.moon.dragging { cursor: grabbing; transform: scale(1.15); }
.moon-label {
    position: absolute;
    top: -28px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    white-space: nowrap;
    color: #fff;
    background: rgba(60, 40, 100, 0.7);
    padding: 3px 10px;
    border-radius: var(--r-pill);
    font-family: var(--font-display);
    pointer-events: none;
}

.legend {
    text-align: center;
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--text-2);
}

/* 地球视角 */
.earth-view {
    position: relative;
    height: 380px;
    background: radial-gradient(ellipse at center, #1a1a3e 0%, #0a0a1a 100%);
    border-radius: var(--r-md);
    border: 2px solid #2a2354;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.viewed-moon {
    width: 220px; height: 220px;
    border-radius: 50%;
    background: #1a1a1a;
    overflow: hidden;
    box-shadow: 0 0 40px rgba(255, 213, 107, 0.35);
    transition: box-shadow 0.4s;
}
.phase-name {
    position: absolute;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 12px rgba(255, 213, 107, 0.8);
}

/* 控制 + 潮汐 */
.controls-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 22px;
    margin-bottom: 22px;
}
@media (max-width: 900px) { .controls-row { grid-template-columns: 1fr; } }

.slider-label {
    display: block;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: var(--text-2);
}
.day-display {
    text-align: center;
    margin: 14px 0 16px;
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--c-grape-d);
}
.day-display span { color: var(--c-peach-d); }

.btn-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.btn-group .btn { flex: 1; min-width: 80px; padding: 10px 14px; font-size: 0.9rem; }

/* 潮汐 */
.tide-card { display: flex; flex-direction: column; }
.tide-stage {
    position: relative;
    height: 160px;
    background: linear-gradient(to bottom, #fff8ee 0%, #f0f7fb 100%);
    border-radius: var(--r-md);
    overflow: hidden;
    border: 2px solid var(--border);
    margin-bottom: 14px;
}
.tide-svg {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
}
.tide-marker {
    position: absolute;
    right: 16px;
    bottom: 8px;
    display: flex; flex-direction: column; align-items: center;
    color: #fff;
    font-family: var(--font-display);
    font-weight: 700;
    text-shadow: 0 1px 3px rgba(0,0,0,0.4);
    transition: bottom 0.6s cubic-bezier(.34,1.56,.64,1);
    pointer-events: none;
}
.tide-arrow { font-size: 22px; }
.tide-label {
    background: rgba(255,255,255,0.85);
    color: var(--c-sky-d);
    padding: 3px 12px;
    border-radius: var(--r-pill);
    font-size: 0.85rem;
    margin-top: 4px;
    box-shadow: var(--shadow-sm);
}
.tide-meter {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-2);
}
.tide-bar {
    flex: 1;
    height: 10px;
    background: var(--border);
    border-radius: var(--r-pill);
    overflow: hidden;
}
.tide-fill {
    height: 100%;
    background: linear-gradient(to right, var(--c-mint), var(--c-sky), var(--c-grape));
    border-radius: var(--r-pill);
    width: 50%;
    transition: width 0.6s cubic-bezier(.34,1.56,.64,1);
}

/* 月相卡片 */
.phase-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 14px;
    margin-top: 14px;
}
.phase-card {
    background: var(--bg-soft);
    border: 2px solid var(--border);
    border-radius: var(--r-md);
    padding: 16px 12px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(.34,1.56,.64,1), box-shadow 0.2s, background 0.2s;
    box-shadow: 0 3px 0 var(--border-2);
}
.phase-card:hover {
    transform: translateY(-4px);
    background: #fff;
    box-shadow: 0 7px 0 var(--c-sun), var(--shadow-md);
}
.phase-card.active {
    background: #fff;
    border-color: var(--c-sun);
    box-shadow: 0 5px 0 var(--c-sun-d), var(--shadow-md);
}
.phase-card .moon-mini {
    width: 64px; height: 64px;
    border-radius: 50%;
    margin: 0 auto 10px;
    background: #1a1a2e;
    overflow: hidden;
    box-shadow: 0 0 12px rgba(80, 60, 140, 0.3);
}
.phase-card .pname {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--text-1);
    font-size: 0.95rem;
}
.phase-card .pdesc {
    font-size: 0.75rem;
    color: var(--text-3);
    margin-top: 2px;
}

/* 日历 */
.calendar-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 14px;
    font-size: 1.15rem;
    color: var(--text-1);
}
.cal-nav { padding: 6px 14px; font-size: 0.9rem; }
.weekdays {
    display: grid; grid-template-columns: repeat(7, 1fr);
    gap: 6px; margin-bottom: 8px;
}
.weekday {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-3);
    padding: 6px;
    font-family: var(--font-display);
}
.calendar-grid {
    display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px;
}
.calendar-day {
    aspect-ratio: 1;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    background: var(--bg-soft);
    border: 2px solid transparent;
    border-radius: var(--r-sm);
    cursor: pointer;
    transition: transform 0.15s, background 0.15s, border-color 0.15s;
    font-size: 12px;
    color: var(--text-1);
}
.calendar-day:hover {
    background: #fff;
    border-color: var(--c-sun);
    transform: scale(1.05);
}
.calendar-day.selected {
    background: var(--c-sun);
    border-color: var(--c-sun-d);
    color: var(--text-1);
    font-weight: 700;
}
.calendar-day .date { font-size: 0.95rem; font-weight: 700; font-family: var(--font-display); }
.calendar-day .moon-icon { font-size: 1rem; margin-top: 1px; }

/* 解释区域 */
.explanation p { line-height: 1.85; margin: 0 0 10px; color: var(--text-2); }
.explanation .highlight {
    color: var(--c-peach-d);
    font-weight: 700;
    background: rgba(255, 213, 107, 0.25);
    padding: 1px 6px;
    border-radius: 6px;
}
.explanation strong { color: var(--text-1); }
.explain-list { padding-left: 22px; line-height: 2; color: var(--text-2); }
.explain-list li { margin-bottom: 4px; }

/* 知识弹窗 */
.trivia-mask {
    position: fixed; inset: 0;
    background: rgba(20, 12, 50, 0.65);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: flex; align-items: center; justify-content: center;
    z-index: 2000;
    padding: 20px;
    animation: maskIn 0.25s ease;
}
.trivia-mask[hidden] { display: none !important; }
@keyframes maskIn { from { opacity: 0; } to { opacity: 1; } }
.trivia-card {
    background: var(--bg-card);
    border-radius: var(--r-xl);
    padding: 32px 28px;
    max-width: 420px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-lg);
    border: 3px solid var(--c-sun);
    position: relative;
    animation: popIn 0.35s cubic-bezier(.34,1.56,.64,1);
}
@keyframes popIn {
    from { transform: scale(0.7); opacity: 0; }
    to   { transform: scale(1);   opacity: 1; }
}
.trivia-close {
    position: absolute; top: 10px; right: 14px;
    background: var(--bg-soft);
    border: 2px solid var(--border-2);
    width: 36px; height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.4rem;
    line-height: 1;
    color: var(--text-2);
    transition: transform 0.15s;
}
.trivia-close:hover { transform: rotate(90deg); }
.trivia-icon {
    font-size: 4rem;
    margin-bottom: 8px;
    filter: drop-shadow(0 4px 12px rgba(255, 213, 107, 0.5));
}
.trivia-card h3 {
    font-size: 1.6rem;
    color: var(--c-grape-d);
    margin: 0 0 12px;
}
.trivia-card p {
    color: var(--text-2);
    line-height: 1.8;
    font-size: 1rem;
    margin: 0;
}