:root {
    /* Light Mode - 선명한 대비 적용 */
    --bg-color: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #475569;
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.1);
    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.05);
    --card-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --input-bg: #ffffff;
    --input-text: #0f172a;
    --input-border: #cbd5e1;
    --modal-bg: #ffffff;
    --nav-text: #64748b;
    --item-bg: #f1f5f9;
    --option-bg: #ffffff;
    --option-text: #0f172a;
}

[data-theme="dark"] {
    /* Dark Mode - 기존 감성 유지 */
    --bg-color: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    --card-bg: #1e293b;
    --card-border: rgba(255, 255, 255, 0.05);
    --card-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    --input-bg: #1e293b;
    --input-text: #ffffff;
    --input-border: rgba(255, 255, 255, 0.1);
    --modal-bg: #1e293b;
    --nav-text: #94a3b8;
    --item-bg: rgba(30, 41, 59, 0.5);
    --option-bg: #1e293b;
    --option-text: #ffffff;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s;
}

.glass {
    background: var(--glass-bg) !important;
    border-color: var(--glass-border) !important;
    backdrop-filter: blur(15px);
}

.card-theme {
    background-color: var(--card-bg) !important;
    border: 1px solid var(--card-border) !important;
    box-shadow: var(--card-shadow) !important;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.item-theme {
    background-color: var(--item-bg) !important;
    border: 1px solid var(--card-border) !important;
    transition: background-color 0.3s;
}

.text-main { color: var(--text-main) !important; }
.text-muted { color: var(--text-muted) !important; }

input, select, textarea {
    background-color: var(--input-bg) !important;
    color: var(--input-text) !important;
    border: 1px solid var(--input-border) !important;
}

.modal-card {
    background: var(--modal-bg) !important;
    color: var(--text-main) !important;
    box-shadow: var(--card-shadow) !important;
}

nav button {
    color: var(--nav-text);
}

nav button.tab-active {
    color: #fb923c;
}

/* 다크모드에서 흰색 글씨 강제되는 부분 수정 */
[data-theme="light"] .text-white:not(.fire-gradient *) {
    color: var(--text-main) !important;
}

/* 그라데이션 및 강조색 유지 */
.fire-gradient {
    background: linear-gradient(135deg, #fb923c 0%, #f43f5e 100%);
}
.fire-gradient .text-white, button.fire-gradient {
    color: #ffffff !important;
}

/* FIRE Formula & Strategy Cards */
.formula-box {
    position: relative;
    padding: 1rem 1.5rem;
    border-radius: 1.25rem;
    background: var(--item-bg);
    border: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 110px;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 10;
}
.formula-label {
    font-size: 1rem;
    font-weight: 900;
    font-style: italic;
    letter-spacing: -0.05em;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.formula-arrow {
    font-size: 0.75rem;
    font-weight: 900;
}
.arrow-up { color: #ef4444; } /* Red for Increase */
.arrow-down { color: #3b82f6; } /* Blue for Decrease */
.connect-line {
    width: 2px;
    height: 32px;
    background: repeating-linear-gradient(to bottom, transparent, transparent 4px, var(--card-border) 4px, var(--card-border) 8px);
    margin: 0 auto;
}
.strategy-card {
    background-color: var(--card-bg);
    padding: 2rem 1.5rem;
    border-radius: 2rem;
    border: 1px solid var(--card-border);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    height: 100%;
}
.strategy-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--card-shadow);
}
/* YouTube Modal Specifics */
#youtubeModal .modal-card {
    cursor: default;
}
#youtubeModal .close-btn {
    opacity: 0;
    transition: opacity 0.1s ease; /* 즉각적인 반응을 위해 매우 짧게 설정 */
    pointer-events: none;
}
#youtubeModal .modal-card:hover .close-btn {
    opacity: 1;
    pointer-events: auto;
}
#youtubeModal .close-btn:hover {
    background: rgba(239, 68, 68, 0.9) !important;
    transform: scale(1.1);
    opacity: 1 !important;
}
/* 닫기 버튼 기본 상태 (영상 호버 시) */
#youtubeModal .modal-card:hover .close-btn {
    opacity: 0.8; /* 흐릿하지 않게 투명도 높임 */
    pointer-events: auto;
}
#youtubeModal .close-btn {
    opacity: 0;
    transition: all 0.1s ease;
    pointer-events: none;
    background: rgba(255, 255, 255, 0.2); /* 배경을 밝게 */
    border: 2px solid rgba(255, 255, 255, 0.8); /* 테두리를 하얗고 두껍게 */
}
#youtubeModal .close-btn i {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(0,0,0,0.8); /* 아이콘 자체에 그림자를 주어 흰색 강조 */
}
.accent-income { border-color: rgba(249, 115, 22, 0.2); }
.accent-income .formula-label { color: #f97316; }
.accent-income-bg { background: rgba(249, 115, 22, 0.05); }

.accent-expense { border-color: rgba(16, 185, 129, 0.2); }
.accent-expense .formula-label { color: #10b981; }
.accent-expense-bg { background: rgba(16, 185, 129, 0.05); }

.accent-yield { border-color: rgba(59, 130, 246, 0.2); }
.accent-yield .formula-label { color: #3b82f6; }
.accent-yield-bg { background: rgba(59, 130, 246, 0.05); }

.accent-target { border-color: rgba(168, 85, 247, 0.2); }
.accent-target .formula-label { color: #a855f7; }
.accent-target-bg { background: rgba(168, 85, 247, 0.05); }

.icon-circle {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 1rem;
    transition: transform 0.5s ease;
}
.strategy-card:hover .icon-circle {
    transform: rotate(360deg);
}
.arrow-icon {
    position: absolute;
    bottom: 1.5rem;
    right: 2rem;
    opacity: 0;
    transition: all 0.3s;
    color: #f97316;
}
.strategy-card:hover .arrow-icon {
    opacity: 1;
    transform: translateX(8px);
}

/* 소프트 활성 탭 스타일 - 눈의 피로도 감소 */
.active-tab-soft {
    background: rgba(249, 115, 22, 0.1) !important; /* 주황색 10% 투명도 */
    color: #f97316 !important;
    box-shadow: inset 0 0 0 1px rgba(249, 115, 22, 0.2) !important;
}
[data-theme="dark"] .active-tab-soft {
    background: rgba(249, 115, 22, 0.15) !important;
    box-shadow: inset 0 0 0 1px rgba(249, 115, 22, 0.3) !important;
}

/* 소프트 버튼 스타일 - 강렬한 그라데이션 대체 */
.btn-soft-fire {
    background: rgba(249, 115, 22, 0.1) !important;
    color: #f97316 !important;
    border: 1px solid rgba(249, 115, 22, 0.3) !important;
    transition: all 0.3s ease;
}
.btn-soft-fire:hover {
    background: rgba(249, 115, 22, 0.2) !important;
    border-color: rgba(249, 115, 22, 0.5) !important;
    transform: translateY(-1px);
}
[data-theme="dark"] .btn-soft-fire {
    background: rgba(249, 115, 22, 0.15) !important;
    border-color: rgba(249, 115, 22, 0.4) !important;
}
[data-theme="dark"] .btn-soft-fire:hover {
    background: rgba(249, 115, 22, 0.25) !important;
}

/* 인사이트 전용 소프트 필터 */
.active-ins-soft {
    background: rgba(16, 185, 129, 0.1) !important;
    color: #10b981 !important;
    box-shadow: inset 0 0 0 1px rgba(16, 185, 129, 0.2) !important;
}
[data-theme="dark"] .active-ins-soft {
    background: rgba(16, 185, 129, 0.15) !important;
}

/* 파이어튜브 전용 소프트 필터 */
.active-red-soft {
    background: rgba(239, 68, 68, 0.1) !important;
    color: #ef4444 !important;
    box-shadow: inset 0 0 0 1px rgba(239, 68, 68, 0.2) !important;
}
[data-theme="dark"] .active-red-soft {
    background: rgba(239, 68, 68, 0.15) !important;
}

/* 커스텀 셀렉트 화살표 컨테이너 */
.select-wrapper {
    position: relative;
    width: 100%;
}
.select-wrapper::after {
    content: '\f078'; /* FontAwesome chevron-down */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    font-size: 0.8rem;
    opacity: 0.5;
    color: var(--text-main);
}

/* 불꽃 레벨별 전용 클래스 - 시인성 강화 */
.flame-core { border-radius: 50% 0 50% 50%; transform: rotate(-45deg); animation: flicker 0.15s infinite alternate; }
@keyframes flicker { from { transform: rotate(-45deg) scale(1); opacity: 0.9; } to { transform: rotate(-45deg) scale(1.05); opacity: 1; } }

.flame-lv1 { width: 1.5rem; height: 1.5rem; background: linear-gradient(to top, #ea580c, #fb923c); box-shadow: 0 0 15px rgba(234,88,12,0.6); }
.flame-lv2 { width: 2.5rem; height: 2.5rem; background: linear-gradient(to top, #f97316, #f87171); box-shadow: 0 0 25px rgba(249,115,22,0.7); }
.flame-lv3 { width: 3.5rem; height: 3.5rem; background: linear-gradient(to top, #dc2626, #fb7185); box-shadow: 0 0 35px rgba(220,38,38,0.8); }
.flame-lv4 { width: 4.5rem; height: 4.5rem; background: linear-gradient(to top, #1d4ed8, #0ea5e9, #22d3ee); box-shadow: 0 0 50px rgba(14, 165, 233, 0.8) !important; }
.flame-lv5 { width: 5.5rem; height: 5.5rem; background: linear-gradient(to top, #d97706, #fbbf24, #fef3c7); box-shadow: 0 0 60px rgba(251,191,36,1) !important; }