:root {
    --primary: #B8963E;
    --primary-glow: rgba(184, 150, 62, 0.15);
    --bg-main: #F5F3EF;
    --bg-card: #FFFFFF;
    --bg-float: #FDF8F0;
    --on-bg: #1a1a1a;
    --on-card: #1a1a1a;
    --border: #E8E4DC;
    --shadow: 0 4px 12px rgba(0,0,0,0.05);
    --text-dim: #888888;
    --glass-blur: blur(25px) saturate(180%);
    --success: #34C759;
    --danger: #FF3B30;
    --calendar-filter: none;
}

html.dark-mode {
    --bg-main: #000000;
    --bg-card: #1C1C1E; /* 아이폰 시스템 세컨더리 배경 */
    --bg-float: #2C2C2E; /* 아이폰 시스템 터셔리 배경 */
    --on-bg: #F2F2F7; /* 눈이 편안한 부드러운 화이트 */
    --on-card: #F2F2F7;
    --primary: #D4AF37; /* 은은한 메탈릭 골드 */
    --primary-glow: rgba(212, 175, 55, 0.15);
    --border: rgba(255, 255, 255, 0.08);
    --shadow: 0 10px 30px rgba(0,0,0,0.6);
    --text-dim: rgba(235, 235, 245, 0.5);
    --calendar-filter: invert(1);
}

* { 
    margin:0; padding:0; box-sizing:border-box; 
    -webkit-font-smoothing:antialiased; 
    -webkit-tap-highlight-color: transparent;
}

body::-webkit-scrollbar { display:none; }

html, body { 
    font-family:'Outfit','Manrope','Noto Sans KR',sans-serif; 
    background-color: var(--bg-main) !important; 
    background: var(--bg-main) !important;
    color: var(--on-bg); 
    min-height: 100vh;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    transition: background-color 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
/* 🧊 Premium UI Elements */
.card { 
    background: var(--bg-card); 
    backdrop-filter: var(--glass-blur); 
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border); 
    border-radius: 32px; 
    box-shadow: var(--shadow);
}

.nav-bar {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border);
    border-radius: 32px;
    padding: 8px 10px;
    display: flex;
    flex-direction: row;
    z-index: 9999;
    box-shadow: 0 15px 50px rgba(0,0,0,0.22); /* 더욱 강력하고 드라마틱한 그림자 */
    width: calc(100% - 48px);
    max-width: 440px;
    justify-content: space-around;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: var(--text-dim);
    text-decoration: none;
    padding: 12px 0;
    border-radius: 20px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex: 1;
}

.nav-item.active {
    color: var(--primary) !important;
    background: rgba(184, 150, 62, 0.18) !important; /* 라이트 모드: 더 확실한 금빛 카드 배경 */
}

html.dark-mode .nav-item.active {
    background: rgba(255, 215, 0, 0.25) !important; /* 다크 모드: 더 묵직한 골드 카드 배경 */
}

.nav-icon { font-size: 26px; }
.nav-label {
    font-size: 11px;
    font-weight: 900; /* 가장 두껍게 */
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ✨ Glow Effect Utility */
.glow-gold {
    box-shadow: 0 0 20px var(--primary-glow);
}

.material-icons-round { vertical-align: middle; }

/* 🧬 Biometric Ring System */
.biometric-ring { 
    position: relative; 
    width: 140px; 
    height: 140px; 
    margin: 0 auto; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
}
.biometric-value { 
    position: absolute; 
    font-size: 32px; 
    font-weight: 900; 
    color: var(--on-card); 
    font-family: 'Space Grotesk', sans-serif; 
}
.biometric-label { 
    position: absolute; 
    bottom: 30px; 
    font-size: 11px; 
    font-weight: 800; 
    color: var(--primary); 
    letter-spacing: 1px; 
    text-transform: uppercase;
}
.progress-ring { 
    transition: stroke-dashoffset 0.8s cubic-bezier(0.4, 0, 0.2, 1); 
}
/* 🕒 Dark Mode Time Picker Icon Fix */
.dark-mode input[type="time"]::-webkit-calendar-picker-indicator,
[data-theme="dark"] input[type="time"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
}