feat: theme variable 추가

Author: sikkzz

src/styles/_variables.scss

@@ -0,0 +1,29 @@
+$font-weight-regular: 400;
+$font-weight-medium: 500;
+$font-weight-semi-bold: 600;
+$font-weight-bold: 700;
+
+$font-size-xl: 28px;
+$font-size-lg: 24px;
+$font-size-md: 22px;
+$font-size-default: 16px;
+$font-size-sm: 15px;
+$font-size-xs: 14px;
+$font-size-xxs: 13px;
+
+$color-white: #fff;
+$color-black: #000;
+$color-text01: #363642;
+$color-text02: #68696e;
+$color-text03: #a6a6ad;
+$color-text04: #e0e0e0;
+$color-text-gradient: linear-gradient(#d444ba, #443fb6);
+$color-gray100: #f8f8f8;
+$color-gray200: #ebecf0;
+$color-gray300: #e1e2e8;
+$color-gray400: #00000026;
+$color-gray500: #00000040;
+$color-gray600: #363642;
+$color-gray700: #161636;
+$color-bg-gradient: linear-gradient(#ffffff, #443fb6);
+$color-bg-error: #d45085;