/* ================================================================
   style.css — 深蓝·冲日凌日 · Cinematic Space Edition
   设计系统：Field.io × NASA 深空可视化 × 中文高雅排版
   ================================================================ */

/* ---- Design Tokens ---- */
:root {
    --space-void: #010812;
    --space-canvas: #020C1A;
    --glass-bg: rgba(255, 255, 255, 0.025);
    --glass-bg-alt: rgba(255, 255, 255, 0.04);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-bg-hover: rgba(255, 255, 255, 0.07);
    --glass-border-hover: rgba(255, 255, 255, 0.14);
    --text-primary: #D8E2F4;
    --text-secondary: #8899B8;
    --text-muted: #4E6080;
    --accent-earth: #4A9EFF;
    --accent-mars: #E67A4A;
    --accent-venus: #D4C06A;
    --accent-sun: #F5B342;
    --glow-earth: rgba(74, 158, 255, 0.2);
    --glow-mars: rgba(230, 122, 74, 0.22);
    --glow-venus: rgba(212, 192, 106, 0.18);
    --glow-sun: rgba(245, 179, 66, 0.35);

    --font-display: "Noto Serif SC", "Source Han Serif SC", "SimSun", "Songti SC", serif;
    --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
    --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", "Courier New", monospace;

    --radius-sm: 6px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 30px;
    --radius-full: 999px;
    --ease-cosmic: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
    --unit: 8px;
}

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

body {
    background: var(--space-void);
    font-family: var(--font-body);
    font-weight: 300;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    text-wrap: pretty;
    /* Ambient static starfield on body */
    background-image:
        radial-gradient(1px 1px at 10% 15%, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 25% 35%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1.5px 1.5px at 40% 10%, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 55% 60%, rgba(255,255,255,0.35), transparent),
        radial-gradient(1.5px 1.5px at 70% 20%, rgba(255,255,255,0.45), transparent),
        radial-gradient(1px 1px at 85% 55%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 15% 75%, rgba(255,255,255,0.35), transparent),
        radial-gradient(1.5px 1.5px at 60% 80%, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 92% 85%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 33% 50%, rgba(255,255,255,0.25), transparent),
        radial-gradient(1.5px 1.5px at 48% 72%, rgba(255,255,255,0.35), transparent),
        radial-gradient(1px 1px at 78% 42%, rgba(255,255,255,0.3), transparent);
    background-size: 200px 200px;
    animation: bodyStars 6s ease-in-out infinite alternate;
}

@keyframes bodyStars {
    0%   { background-position: 0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0; }
    100% { background-position: 3px -2px, -2px 3px, 1px 1px, -3px 1px, 0px -3px, 2px -1px, -1px -2px, 3px 2px, 0px 2px, -2px 0px, 2px -3px, 1px 3px; }
}

/* ---- App Container ---- */
.app-container {
    max-width: 1440px;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(28px) saturate(130%);
    -webkit-backdrop-filter: blur(28px) saturate(130%);
    border-radius: var(--radius-xl);
    padding: 32px;
    border: 1px solid var(--glass-border);
    box-shadow:
        0 0 0 1px rgba(255,255,255,0.03) inset,
        0 40px 80px rgba(0,0,0,0.55),
        0 0 140px rgba(74,120,200,0.03);
    transition: box-shadow 0.8s var(--ease-cosmic);
}

/* ---- Grid ---- */
.grid-layout {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 32px;
    align-items: start;
}

/* ---- Canvas Wrapper ---- */
.canvas-wrapper {
    background: var(--space-canvas);
    border-radius: var(--radius-lg);
    padding: 8px;
    border: 1px solid rgba(255,255,255,0.04);
    box-shadow:
        0 0 0 1px rgba(255,255,255,0.02) inset,
        0 0 60px rgba(0,0,0,0.45);
    position: relative;
    overflow: hidden;
}

/* Vignette frame — inner shadow on the canvas wrapper */
.canvas-wrapper::after {
    content: '';
    position: absolute;
    inset: 8px;
    border-radius: calc(var(--radius-lg) - 4px);
    pointer-events: none;
    box-shadow: inset 0 0 80px rgba(0,0,0,0.35);
    z-index: 2;
}

canvas {
    display: block;
    width: 100%;
    aspect-ratio: 1/1;
    background: var(--space-void);
    border-radius: calc(var(--radius-lg) - 4px);
    cursor: pointer;
    transition: filter 0.6s var(--ease-cosmic);
}

/* ---- Right Panel ---- */
.right-panel {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

/* ---- Header Title (Cinematic Chinese) ---- */
.header-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1.7rem;
    letter-spacing: 0.12em;
    color: var(--text-primary);
    opacity: 0.88;
    text-align: left;
    padding-bottom: 6px;
    position: relative;
}

.header-title::before {
    content: '';
    display: block;
    width: 28px;
    height: 1px;
    background: rgba(255,255,255,0.15);
    margin-bottom: 14px;
}

/* ---- Mode Toggle Group ---- */
.mode-group {
    display: flex;
    gap: 8px;
}

.mode-btn {
    flex: 1;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 11px 20px;
    border-radius: var(--radius-lg);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 0.9rem;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: all 0.45s var(--ease-cosmic);
    text-align: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    user-select: none;
}

.mode-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0;
    transition: opacity 0.45s var(--ease-cosmic);
    pointer-events: none;
}

.mode-btn[data-mode="opposition"]::after {
    background: radial-gradient(ellipse at center, var(--glow-mars), transparent 70%);
}

.mode-btn[data-mode="transit"]::after {
    background: radial-gradient(ellipse at center, var(--glow-venus), transparent 70%);
}

.mode-btn:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.mode-btn:active {
    transform: scale(0.97);
    transition: transform 0.12s var(--ease-cosmic);
}

.mode-btn.active {
    background: rgba(255,255,255,0.07);
    color: #fff;
    border-color: rgba(255,255,255,0.12);
}

.mode-btn.active::after {
    opacity: 1;
}

.mode-btn[data-mode="opposition"].active {
    box-shadow: 0 0 28px var(--glow-mars), 0 0 0 1px rgba(230,122,74,0.2);
}

.mode-btn[data-mode="transit"].active {
    box-shadow: 0 0 28px var(--glow-venus), 0 0 0 1px rgba(212,192,106,0.2);
}

/* ---- Info Card ---- */
.info-card {
    background: var(--glass-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-radius: var(--radius-lg);
    padding: 18px 22px;
    border: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    transition: border-color 0.4s var(--ease-cosmic);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.info-label {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.info-value {
    background: rgba(255,255,255,0.03);
    padding: 4px 16px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(255,255,255,0.05);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.82rem;
    letter-spacing: 0.02em;
    transition: all 0.35s var(--ease-cosmic);
    min-width: 80px;
    text-align: center;
}

.info-value.special {
    background: rgba(74,158,255,0.1);
    border-color: rgba(74,158,255,0.22);
    color: #fff;
    animation: dataHighlight 2.4s ease-in-out infinite alternate;
}

@keyframes dataHighlight {
    0%   { box-shadow: 0 0 10px rgba(74,158,255,0.1); }
    100% { box-shadow: 0 0 26px rgba(74,158,255,0.3); }
}

/* ---- Position Indicator ---- */
.pos-indicator {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    background: var(--glass-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-radius: var(--radius-full);
    padding: 10px 16px;
    border: 1px solid var(--glass-border);
    justify-content: center;
    align-items: center;
}

.pos-indicator > span:first-child {
    font-family: var(--font-body);
    color: var(--text-muted);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    margin-right: 2px;
}

.pos-tag {
    background: rgba(255,255,255,0.02);
    padding: 3px 12px;
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 300;
    color: var(--text-secondary);
    border: 1px solid rgba(255,255,255,0.04);
    letter-spacing: 0.03em;
    transition: all 0.45s var(--ease-cosmic);
}

.pos-tag.active-tag {
    background: rgba(255,255,255,0.07);
    color: #fff;
    border-color: rgba(255,255,255,0.13);
    box-shadow: 0 0 16px rgba(74,158,255,0.1);
}

/* ---- Control Row ---- */
.control-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    background: var(--glass-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-radius: var(--radius-full);
    padding: 12px 22px;
    border: 1px solid var(--glass-border);
    align-items: center;
}

/* ---- Range Sliders ---- */
.control-row input[type="range"] {
    flex: 2;
    height: 2px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255,255,255,0.08);
    border-radius: 10px;
    outline: none;
    cursor: pointer;
}

.control-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 15px;
    height: 15px;
    background: #E0E8F4;
    border-radius: 50%;
    border: 1.5px solid rgba(255,255,255,0.25);
    box-shadow: 0 0 14px rgba(74,158,255,0.25);
    cursor: pointer;
    transition: all 0.25s var(--ease-cosmic);
}
.control-row input[type="range"]::-webkit-slider-thumb:hover {
    box-shadow: 0 0 22px rgba(74,158,255,0.45);
    transform: scale(1.1);
}
.control-row input[type="range"]::-webkit-slider-thumb:active {
    box-shadow: 0 0 30px rgba(74,158,255,0.55);
    transform: scale(0.95);
}

/* Firefox */
.control-row input[type="range"]::-moz-range-thumb {
    width: 15px;
    height: 15px;
    background: #E0E8F4;
    border-radius: 50%;
    border: 1.5px solid rgba(255,255,255,0.25);
    box-shadow: 0 0 14px rgba(74,158,255,0.25);
    cursor: pointer;
}

/* ---- Action Buttons ---- */
.action-btn {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.07);
    color: var(--text-secondary);
    padding: 7px 18px;
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.35s var(--ease-cosmic);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    white-space: nowrap;
    user-select: none;
}

.action-btn:hover {
    background: rgba(255,255,255,0.09);
    border-color: rgba(255,255,255,0.16);
    color: #fff;
    box-shadow: 0 0 18px rgba(74,158,255,0.08);
    transform: translateY(-1px);
}

.action-btn:active {
    transform: scale(0.96);
    transition: transform 0.1s var(--ease-cosmic);
}

.action-btn:focus-visible {
    outline: 2px solid rgba(74,158,255,0.4);
    outline-offset: 2px;
}

/* ---- Speed Control ---- */
.speed-control {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.02);
    padding: 3px 14px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(255,255,255,0.04);
}

.speed-control span {
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 300;
    letter-spacing: 0.05em;
}
.speed-control span:last-child {
    color: var(--text-muted);
    font-size: 0.65rem;
}

/* ---- Date Range ---- */
.date-range {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.015);
    padding: 3px 12px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(255,255,255,0.03);
}

.date-range span {
    font-family: var(--font-body);
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.05em;
}

.date-range input {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.05);
    color: var(--text-primary);
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-family: var(--font-mono);
    font-size: 0.74rem;
    font-weight: 400;
    outline: none;
    transition: all 0.3s var(--ease-cosmic);
}

.date-range input:focus {
    border-color: rgba(74,158,255,0.3);
    box-shadow: 0 0 12px rgba(74,158,255,0.08);
}

/* ---- Calculation Box ---- */
.calc-box {
    background: rgba(2,10,22,0.88);
    backdrop-filter: blur(26px) saturate(130%);
    -webkit-backdrop-filter: blur(26px) saturate(130%);
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    border: 1px solid rgba(255,255,255,0.07);
    display: none;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-primary);
    position: relative;
    margin-top: 6px;
    line-height: 1.75;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.calc-box.show {
    display: block;
    animation: calcReveal 0.45s var(--ease-out-expo);
}

.calc-box-title {
    font-family: var(--font-body);
    font-weight: 400;
    color: rgba(255,255,255,0.55);
    margin-bottom: 8px;
    letter-spacing: 0.06em;
    font-size: 0.75rem;
}

@keyframes calcReveal {
    0%   { opacity: 0; transform: translateY(-16px); }
    100% { opacity: 1; transform: translateY(0); }
}

.calc-box .close-calc {
    position: absolute;
    top: 10px;
    right: 16px;
    cursor: pointer;
    opacity: 0.35;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: all 0.25s;
    line-height: 1;
}
.calc-box .close-calc:hover {
    opacity: 0.9;
    color: #fff;
    transform: rotate(90deg);
}

/* ---- Day Counter ---- */
.time-label {
    color: var(--text-secondary);
    min-width: 80px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 400;
    letter-spacing: 0.03em;
}

/* ================================================================
   Tweaks Panel — 右下角浮动参数面板
   ================================================================ */

.tweaks-toggle {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    z-index: 100;
    transition: all 0.35s var(--ease-cosmic);
    user-select: none;
}

.tweaks-toggle:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.16);
    color: #fff;
    box-shadow: 0 0 20px rgba(74,158,255,0.12);
}

.tweaks-toggle:active {
    transform: scale(0.92);
}

.tweaks-panel {
    position: fixed;
    bottom: 82px;
    right: 28px;
    width: 240px;
    background: rgba(2,10,24,0.92);
    backdrop-filter: blur(28px) saturate(140%);
    -webkit-backdrop-filter: blur(28px) saturate(140%);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    padding: 0;
    z-index: 99;
    opacity: 0;
    transform: translateY(12px) scale(0.96);
    pointer-events: none;
    transition: all 0.35s var(--ease-out-expo);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.tweaks-panel.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.tweaks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px 10px;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 400;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.tweaks-close {
    cursor: pointer;
    opacity: 0.4;
    font-size: 1rem;
    transition: opacity 0.2s;
    line-height: 1;
}
.tweaks-close:hover { opacity: 0.9; }

.tweaks-body {
    padding: 12px 18px 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.tweak-row {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.tweak-row > span:first-child {
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.tweak-row input[type="range"] {
    width: 100%;
    height: 2px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255,255,255,0.08);
    border-radius: 10px;
    outline: none;
    cursor: pointer;
}

.tweak-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: #D0D8F0;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 0 10px rgba(74,158,255,0.2);
    cursor: pointer;
}

.tweak-val {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-secondary);
    text-align: right;
}

/* ---- Responsive ---- */
@media (max-width: 960px) {
    .grid-layout {
        grid-template-columns: 1fr;
    }
    .app-container {
        padding: 18px;
        border-radius: var(--radius-lg);
    }
    .header-title {
        font-size: 1.3rem;
    }
    .control-row {
        border-radius: var(--radius-lg);
        padding: 10px 16px;
    }
    .tweaks-toggle {
        bottom: 16px;
        right: 16px;
        width: 36px;
        height: 36px;
    }
    .tweaks-panel {
        bottom: 64px;
        right: 16px;
        width: 220px;
    }
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
    body { animation: none; }
    .calc-box.show { animation: none; }
    .info-value.special { animation: none; }
    .mode-btn, .action-btn, .tweaks-toggle { transition: none; }
}