:root {
    --bg-color: #0f111a;
    --text-main: #ffffff;
    --text-muted: #94a3b8; /* slate-400 */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --modal-bg: #1e293b;
    --modal-overlay: rgba(15, 17, 26, 0.98);
    --input-bg: rgba(255, 255, 255, 0.05);
    --input-border: rgba(255, 255, 255, 0.1);
    --finance-border: rgba(255, 255, 255, 0.05);
    --btn-secondary-bg: rgba(255, 255, 255, 0.05);
    --btn-secondary-border: rgba(255, 255, 255, 0.05);
}

:root[data-theme="light"] {
    --bg-color: #f1f5f9;  /* slate-100 */
    --text-main: #0f172a; /* slate-900 */
    --text-muted: #64748b; /* slate-500 */
    --glass-bg: rgba(255, 255, 255, 0.7); /* brilliant glass */
    --glass-border: rgba(0, 0, 0, 0.05);
    --modal-bg: #ffffff;
    --modal-overlay: rgba(241, 245, 249, 0.8);
    --input-bg: rgba(0, 0, 0, 0.03);
    --input-border: rgba(0, 0, 0, 0.1);
    --finance-border: rgba(0, 0, 0, 0.05);
    --btn-secondary-bg: rgba(0, 0, 0, 0.03);
    --btn-secondary-border: rgba(0, 0, 0, 0.05);
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
}

.theme-text-main {
    color: var(--text-main);
}

.theme-bg-main {
    background-color: var(--bg-color) !important;
}

.theme-glass-btn {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
}
.theme-glass-btn:active {
    background: var(--btn-secondary-border);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 2.5rem;
}
#modal-overlay {
    background: var(--modal-overlay);
    display: none;
}
#modal-content-container {
    background: var(--modal-bg) !important;
}
        .page { display: none; }
        .page.active { display: block; }
        .nav-btn { color: #475569; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
        .nav-btn.active { color: #0088cc; transform: translateY(-2px); }
        .nav-btn.active svg { filter: drop-shadow(0 4px 6px rgba(0, 136, 204, 0.15)); }

        input, textarea, select {
            background: var(--input-bg);
            border: 1px solid var(--input-border);
            border-radius: 1.2rem;
            padding: 1rem;
            color: var(--text-main);
            width: 100%;
            outline: none;
        }
        .finance-item {
            border-bottom: 1px solid var(--finance-border);
            padding: 6px 0;
        }
        option {
            background: var(--modal-bg);
            color: var(--text-main);
        }
        #modal-body::-webkit-scrollbar { width: 4px; }
        #modal-body::-webkit-scrollbar-thumb {
            background: var(--glass-border);
            border-radius: 10px;
        }
        .action-btn-secondary {
            width: 100%;
            display: flex;
            justify-content: space-between;
            padding: 0.5rem;
            background: var(--btn-secondary-bg);
            border: 1px solid var(--btn-secondary-border);
            border-radius: 1.8rem;
            transition: opacity 0.2s;
        }
        .action-btn-secondary:active { opacity: 0.7; }
        .btn-label-base {
            font-size: 10px;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }