:root {
    /* --- 訓練區核心 (必須保持極致黑以確保濾光物理作用) --- */
    --arena-bg: #000000;         
    
    /* --- 凡特錫高階醫療 SaaS 色彩系統 --- */
    --panel-bg: #FFFFFF;         /* 純白底色 */
    --brand-blue: #4A90E2;       /* 醫療信任藍 */
    --accent-gold: #D4AF37;      /* 凡特錫經典點綴金 */
    --accent-red: #E11D48;       /* 警示與作動紅 */
    --border-silver: #CBD5E1;    /* 銀灰色線條 */
    --bg-light-gray: #F8FAFC;    /* 極淺灰 (用於細微層次區分) */
    
    /* --- 文字色彩 --- */
    --text-main: #334155;        /* 深石板灰 (易讀且不刺眼) */
    --text-muted: #64748b;       /* 說明用中灰 */
}

* { box-sizing: border-box; font-family: 'Urbanist', 'Noto Sans TC', sans-serif; }

body { 
    margin: 0; background-color: var(--bg-light-gray); 
    display: flex; justify-content: center; align-items: center; min-height: 100vh;
}

/* =========================================
   銀線框大框 (主應用程式容器)
========================================= */
#fv-fusion-app {
    width: 100%; max-width: 1150px; height: 850px; max-height: 90vh; 
    border-radius: 12px; box-shadow: 0 20px 40px -10px rgba(0,0,0,0.15);
    border: 2px solid var(--border-silver); /* 銀線框大框 */
    display: flex; flex-direction: row-reverse; 
    background-color: var(--panel-bg); color: var(--text-main); 
    overflow: hidden; position: relative;
}

#fv-fusion-app:fullscreen, #fv-fusion-app:-webkit-full-screen {
    max-width: 100vw !important; height: 100vh !important; max-height: 100vh !important; 
    margin: 0 !important; border-radius: 0 !important; border: none !important;
}

.control-panel {
    width: 340px; flex-shrink: 0; height: 100%; 
    background: var(--panel-bg); padding: 22px; 
    border-left: 2px solid var(--border-silver); 
    display: flex; flex-direction: column; gap: 14px; 
    overflow-y: auto; z-index: 20;
    color-scheme: light; 
}

.app-title { 
    font-size: 22px; font-weight: 700; 
    color: var(--brand-blue); 
    border-bottom: 2px solid var(--border-silver); 
    padding-bottom: 12px; margin-bottom: 4px;
    text-align: center; letter-spacing: 2px;
}

/* =========================================
   金線框小框 (功能分類區塊)
========================================= */
.panel-section {
    background: var(--panel-bg); 
    border: 1px solid var(--accent-gold); /* 金線框小框 */
    border-radius: 8px; padding: 16px 14px; margin-bottom: 4px;
    display: flex; flex-direction: column; gap: 12px;
    box-shadow: 0 4px 10px rgba(212, 175, 55, 0.05); 
}

.section-title {
    font-size: 13px; font-weight: 700; color: var(--brand-blue);
    letter-spacing: 1px; margin-bottom: 4px;
    display: flex; justify-content: space-between; align-items: center;
}

.control-group { display: flex; flex-direction: column; gap: 6px; }
.control-group label { 
    font-size: 13px; font-weight: 700; color: var(--text-main); 
    margin: 0; display: flex; justify-content: space-between; align-items: center;
}

.control-group label span.val-display { 
    color: var(--brand-blue); font-weight: bold; font-family: 'Azeret Mono', monospace;
    background: var(--bg-light-gray); padding: 2px 6px; border-radius: 4px; border: 1px solid var(--border-silver);
}

select, input[type="text"], input[type="number"] {
    width: 100%; padding: 8px 12px; background: #ffffff; 
    border: 1px solid var(--border-silver); 
    border-radius: 6px; color: var(--text-main); outline: none;
    font-size: 13px; font-weight: bold; transition: 0.2s;
}
select:focus, input[type="text"]:focus, input[type="number"]:focus { 
    border-color: var(--brand-blue); 
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.2);
}

/* =========================================
   🚀 執行長特製：金點與專屬色彩軌道拉桿
========================================= */
input[type="range"] { 
    -webkit-appearance: none;
    appearance: none;
    width: 100%; 
    height: 8px;
    background: var(--border-silver); /* 圓點右側：淺灰色 */
    border-radius: 6px;
    outline: none;
    overflow: hidden; 
    margin: 6px 0; 
}

/* Chrome, Safari, Edge 支援 */
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-gold); /* 圓點全面統一：凡特錫金 */
    cursor: pointer;
    box-shadow: -400px 0 0 400px var(--brand-blue); /* 預設圓點左側軌道：醫療藍色 */
    border: 2px solid #ffffff; /* 白色描邊增加立體感 */
}

/* --- 光學色彩拉桿專屬覆寫 (該紅就紅、該綠就綠) --- */
#red-slider::-webkit-slider-thumb { box-shadow: -400px 0 0 400px #ef4444; }
#green-slider::-webkit-slider-thumb { box-shadow: -400px 0 0 400px #10b981; }
#blue-slider::-webkit-slider-thumb { box-shadow: -400px 0 0 400px #3b82f6; }

/* Firefox 支援 */
input[type="range"]::-moz-range-track {
    width: 100%; height: 8px; background: var(--border-silver); border-radius: 6px;
}
input[type="range"]::-moz-range-progress {
    background: var(--brand-blue); height: 8px; border-radius: 6px;
}
input[type="range"]::-moz-range-thumb {
    width: 16px; height: 16px; border-radius: 50%; background: var(--accent-gold);
    cursor: pointer; border: 2px solid #ffffff;
}
/* Firefox 光學色彩拉桿專屬覆寫 */
#red-slider::-moz-range-progress { background: #ef4444; }
#green-slider::-moz-range-progress { background: #10b981; }
#blue-slider::-moz-range-progress { background: #3b82f6; }


.checkbox-wrapper {
    display: flex; align-items: center; gap: 6px; font-size: 12px; cursor: pointer; color: var(--text-main); font-weight: bold;
    background: #ffffff; padding: 4px 8px; border-radius: 6px; 
    border: 1px solid var(--border-silver); transition: 0.2s;
}
.checkbox-wrapper:hover { border-color: var(--brand-blue); }
.checkbox-wrapper input { cursor: pointer; margin: 0; accent-color: var(--brand-blue); }

.checkbox-wrapper.active-ai { 
    background: rgba(212, 175, 55, 0.1); color: var(--accent-gold); border-color: var(--accent-gold);
}

.btn-row { display: flex; gap: 12px; margin-top: 5px; justify-content: center; }

.btn-toggle {
    flex: 1; background: var(--brand-blue); color: #ffffff; border: none; 
    padding: 12px; border-radius: 8px; font-size: 15px; font-weight: bold; 
    cursor: pointer; transition: 0.3s; box-shadow: 0 4px 10px rgba(74, 144, 226, 0.3);
}
.btn-toggle:hover { filter: brightness(1.1); transform: translateY(-2px); }
.btn-toggle.active { background: var(--accent-red); box-shadow: 0 4px 10px rgba(225, 29, 72, 0.3); }

.btn-reset {
    width: 48px; background: #ffffff; color: var(--text-muted); 
    border: 1px solid var(--border-silver); border-radius: 8px; cursor: pointer;
    display: flex; justify-content: center; align-items: center; transition: 0.2s;
}
.btn-reset:hover { background: var(--bg-light-gray); color: var(--accent-red); border-color: var(--accent-red); }

.btn-fullscreen {
    background: #ffffff; color: var(--accent-gold); 
    border: 1px solid var(--accent-gold); 
    padding: 10px; border-radius: 8px; font-size: 13px; font-weight: bold; 
    cursor: pointer; transition: 0.2s; margin-top: 5px;
}
.btn-fullscreen:hover { background: rgba(212, 175, 55, 0.05); }

/* =========================================
   訓練區與 HUD 懸浮窗
========================================= */
.training-arena {
    flex-grow: 1; height: 100%; position: relative; 
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    background-color: var(--arena-bg); isolation: isolate; 
}

.hud {
    position: absolute; top: 40px; left: 50%; transform: translateX(-50%);
    font-family: 'Azeret Mono', monospace; color: #94a3b8; font-size: 13px; text-align: center;
    line-height: 1.6; background: rgba(15, 23, 42, 0.85); backdrop-filter: blur(10px);
    padding: 12px 24px; border-radius: 12px; 
    border: 2px solid var(--brand-blue); /* 醫療藍外框 */
    z-index: 10; min-width: 380px; box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}
.hud strong { color: #ffffff; font-size: 16px; }
.hud .lab-tag { 
    display: block; margin-top: 8px; padding-top: 8px; border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 11px; letter-spacing: 3px; color: #cbd5e1; width: 100%; text-align: center; 
}

.timer-display { color: var(--brand-blue) !important; font-weight: 900 !important; font-size: 17px !important; }

@keyframes gentlePulse { 0% { opacity: 0.3; } 50% { opacity: 0.8; } 100% { opacity: 0.3; } }
.breathe-reminder {
    position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
    color: var(--brand-blue); font-size: 14px; font-weight: 700; letter-spacing: 2px;
    animation: gentlePulse 4s infinite ease-in-out;
    background: rgba(255, 255, 255, 0.1); padding: 8px 16px; border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2); pointer-events: none; z-index: 10;
}