:root{

/* light theme */
--background-light: hsl(293, 100%, 98%);
--on-background-light: hsl(264, 8%, 12%);
--surface-light: hsl(293, 100%, 98%);
--on-surface-light: hsl(264, 8%, 12%);
--on-surface-variant-light: hsl(264, 7%, 29%);
--surface-container-low-light: hsl(278, 44%, 96%);
--surface-container-light: hsl(276, 38%, 95%);
--surface-bright-light: hsl(293, 100%, 98%);
--primary-light: hsl(256, 34%, 48%);
--on-primary-light: hsl(0, 0%, 100%);
--outline-light: hsl(270, 4%, 47%);
--outline-variant-light: hsl(270, 11%, 79%);

/* dark theme */
--background-dark: hsl(260, 14%, 8%);
--on-background-dark: hsl(280, 17%, 90%);
--surface-dark: hsl(260, 14%, 8%);
--on-surface-dark: hsl(280, 17%, 90%);
--on-surface-variant-dark: hsl(270, 11%, 79%);
--surface-container-low-dark: hsl(264, 8%, 12%);
--surface-container-dark: hsl(257, 10%, 14%);
--surface-bright-dark: hsl(270, 5%, 23%);
--primary-dark: hsl(258, 100%, 87%);
--on-primary-dark: hsl(259, 58%, 28%);
--outline-dark: hsl(264, 5%, 58%);
--outline-variant-dark: hsl(264, 7%, 29%);

/* font family  */
--font-primary: 'Open Sans', sans-serif;
--font-secondary: 'Noto Sans', sans-serif;

/* font size  */
--base-font-size: 62.5%;
--display-large: 5.7rem;
--display-medium: 4.5rem;
--display-small: 3.0rem;
--headline-large: 3.2rem;
--headline-medium: 2.8rem;
--headline-small: 2.4rem;
--title-large: 1.4rem;
--title-medium: 1.6rem;
--title-small: 1.4rem;
--label-large: 1.4rem;
--label-medium: 1.2rem;
--label-small: 1.1rem;
--body-large: 1.6rem;
--body-medium: 1.4rem;
--body-small: 1.2rem;

/* font weight  */
--weight-regular: 400;
--weight-medium: 500;

/* box radius  */
--radius-extra-small: 4px;
--radius-small: 8px;
--radius-medium: 12px;
--radius-large: 16px;
--radius-full: 500px;
--radius-circle: 50%;

/* box shadow  */
--elevation-1: 0px 1px 3px 1px #00000026, 0px 1px 2px 0px #0000004d;

/* others */
--section-padding: 24px;
--top-bar-height: 64px;
}

[data-theme="light"] {
color-scheme: light;

--background: var(--background-light);
--on-background: var(--on-background-light); 
--surface: var(--surface-light); 
--on-surface: var(--on-surface-light); 
--on-surface-variant: var(--on-surface-variant-light); 
--surface-container-low: var(--surface-container-low-light); 
--surface-container: var(--surface-container-light);
--surface-bright: var(--surface-bright-light); 
--primary: var(--primary-light); 
--on-primary: var(--on-primary-light); 
--outline: var(--outline-light); 
--outline-variant: var(--outline-variant-light); 

}

[data-theme="dark"] {
    color-scheme: dark;
    
    --background: var(--background-dark);
    --on-background: var(--on-background-dark);
    --surface: var(--surface-dark); 
    --on-surface: var(--on-surface-dark); 
    --on-surface-variant: var(--on-surface-variant-dark); 
    --surface-container-low: var(--surface-container-low-dark); 
    --surface-container: var(--surface-container-dark); 
    --surface-bright: var(--surface-bright-dark); 
    --primary: var(--primary-dark); 
    --on-primary: var(--on-primary-dark); 
    --outline: var(--outline-dark); 
    --outline-variant: var(--outline-variant-dark); 
    
}

@media (prefers-reduced-motion: no-preference) {
    :root {
        /* duration  */
        --motion-duration-short-1: 100ms;
    }
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

li { list-style: none; }

a,
img,
span,
input,
button,
textarea {display: block; }

a {
    color: inherit;
    text-decoration: none;
}

img { height: auto; }

input,
button,
textarea {
    background: none;
    border: none;
    font: inherit;
}

input,
textarea {width: 100%; }

button {cursor : pointer ;}

textarea { resize: none;}

html {
    font-family: var(--font-secondary);
    font-size: var(--base-font-size);
    scroll-behavior: smooth;
}

body {
    background-color: var(--background);
    color : var(--on-background);
    font-size: var(--body-large);
}

/* typography */
.display-large {
    font-family: var(--font-primary);
    font-size: var(--display-large);
    font-weight: var(--weight-regular);
    line-height: 64px;
    letter-spacing: -0.25px;
}

.display-medium {
    font-family: var(--font-primary);
    font-size: var(--display-medium);
    font-weight: var(--weight-regular);
    line-height: 52px;
}

.display-small {
    font-family: var(--font-primary);
    font-size: var(--display-small);
    font-weight: var(--weight-regular);
    line-height: 44px;
}

.headline-large {
    font-family: var(--font-primary);
    font-size: var(--headline-large);
    font-weight: var(--weight-regular);
    line-height: 40px;
    
}

.headline-medium {
    font-family: var(--font-primary);
    font-size: var(--headline-medium);
    font-weight: var(--weight-regular);
    line-height: 36px;
    
}

.headline-small {
    font-family: var(--font-primary);
    font-size: var(--headline-small);
    font-weight: var(--weight-regular);
    line-height: 32px;
    
}

.title-large {
    font-family: var(--font-primary);
    font-size: var(--title-large);
    font-weight: var(--weight-medium);
    line-height: 28px;
    
}

.title-medium {
    font-family: var(--font-primary);
    font-size: var(--title-medium);
    font-weight: var(--weight-medium);
    line-height: 24px;
    letter-spacing: 0.15px;
    
}

.title-small {
    font-family: var(--font-primary);
    font-size: var(--title-small);
    font-weight: var(--weight-medium);
    line-height: 20px;
    letter-spacing: 0.1px;
    
}

.body-large {
    font-size: var(--body-large);
    font-weight: var(--weight-regular);
    line-height: 24px;
    letter-spacing: 0.5px;
    
}

.body-medium {
    font-size: var(--body-medium);
    font-weight: var(--weight-regular);
    line-height: 20px;
    letter-spacing: 0.25px;
    
}

.body-small {
    font-size: var(--body-small);
    font-weight: var(--weight-regular);
    line-height: 16px;
    letter-spacing: 0.4px;
    
}

.label-large {
    font-size: var(--label-large);
    font-weight: var(--weight-medium);
    line-height: 20px;
    letter-spacing: 0.1px;
    
}

.label-medium {
    font-size: var(--label-medium);
    font-weight: var(--weight-medium);
    line-height: 16px;
    letter-spacing: 0.5px;
    
}

.label-small {
    font-size: var(--label-small);
    font-weight: var(--weight-medium);
    line-height: 16px;
    letter-spacing: 0.5px;
    
}

.material-symbols-outlined {
    width: 1em;
    height: 1em;
    display: block;
    font-variation-settings: 
    'FILL' 0,
    'wght' 400,
    'GRAD' 0,
    'opsz' 24;
}

:has(> .state-layer) {
    position: relative;
    overflow: hidden;
    z-index : 1;
}

.state-layer {
    position: absolute;
    inset: 0;
    background-color: var(--state-layer-bg);
    transition: var(--motion-duration-short-1) var(--motion-easing-linear);
    opacity: 0;
}

:has(> .state-layer):hover .state-layer {opacity: 0.08; }

:has(> .state-layer):is(:focus, :focus-visible, :active) .state-layer {
    opacity: 0.12;
}

.section { padding-block: var(--section-padding); }

.container { padding-inline: 16px; }

.img-holder {
    aspect-ratio: var(--width) / var(--height);
    background-color: transparent;
    overflow: hidden;
}

.img-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.tab-content:not(.active) {display: none; }

.icon-btn {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;

}

.btn {
    height: 40px;
    display: grid;
    place-items: center;
    padding-inline: 24px;
    border-radius: var(--radius-full);
    background-color: var(--primary);
    color: var(--on-primary);
    font-weight: var(--weight-medium);
    overflow: hidden;
    --state-layer-bg: var(--on-primary);
}

.btn:hover:not(:focus) { box-shadow: var(--elevation-1); }



.primary-tabs {
    background-color: var(--background);
    margin-block-start: 24px;
    margin-inline: 16px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    justify-content: center;
    border-block-end: 1px solid var(--outline-variant);
}

.tab-btn {
    height: 48px;
    width: 100%;
    display: grid;
    place-content: center;
    background-color: var(--surface);
    color: var(--on-surface-variant);
    --state-layer-bg: var(--on-surface-variant);
}

.tab-btn.active {
    color: var(--primary);
    --state-layer-bg: var(--primary);
}

.tab-text {
    position: relative;
    height: 48px;
    line-height: 48px;
}

.tab-text::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    border-radius: 3px 3px 0 0;
    background-color: var(--primary);
    opacity: 0;
}

.tab-btn.active .tab-text::after {opacity: 1;}


.chip {
    height: 32px;
    max-width: max-content;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding-inline: 16px;
    border: 1px solid var(--outline);
    border-radius: var(--radius-small);
    background-color: var(--surface);
    color: var(--on-surface-variant);
    --state-layer-bg: var(--on-surface-variant);
}

.chip .material-symbols-outlined {font-size: 1.8rem;}

.card {
    background-color: var(--surface-container-low);
    border-radius: var(--radius-medium);
    padding: 16px;
    display: grid;
    gap: 16px;
    --state-layer-bg: var(--on-surface);
}

.card-banner { border-radius: var(--radius-medium); }

.card-content {
    display: grid;
    gap: 4px;
}

.card-subtitle {
    color: var(--on-surface-variant);
}

.card-title {
    color: var(--on-surface);
}

.input-field,
.textarea {
    color: var(--on-surface);
    padding: 13px 16px;
    box-shadow: inset 0 0 0 1px var(--outline);
    border-radius: var(--radius-extra-small);
    outline: none;
    transition: box-shadow var(--motion-duration-short-1) var(--motion-easing-linear);
}

.textarea {
    height: 120px;
    padding: 16px;
}

:where(.input-field, .textarea)::placeholder {color: var(--on-surface-variant); }

:where(.input-field, .textarea):focus {box-shadow: inset 0 0 0 2px var(--primary); }

.topbar {
    background-color: var(--background);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--top-bar-height) ;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-inline: 16px;
    z-index: 4;
}

[data-theme="dark"] .logo .light,
[data-theme="light"] .logo .dark {display: none; }

[data-theme="dark"] .logo .dark,
[data-theme="light"] .logo .light {display: block; }

.theme-btn {
    color: var(--on-surface-variant);
    --state-layer-bg: var(--on-surface-variant);
    border-radius: var(--radius-full);
    overflow: hidden;
}

[data-theme="dark"] .theme-btn .dark,
[data-theme="light"] .theme-btn .light {display: none; } 


.hero { padding-block-start: calc(var(--top-bar-height) + 24px); }

.hero .container{
    display: grid;
    align-items: center;
    gap: 24px;
}

.hero-banner {
    width: 240px;
    border-radius: var(--radius-circle);
}

.hero-content {
    max-width: 500px;
}

.hero .section-subtitle { color: var(--on-surface-variant); }

.hero .section-text {
    margin-block: 5px 16px ;
    color: var(--on-surf)
}

.hero .btn-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.about-card {
    background-color: var(--surface-container-low);
    color: var(--on-surface-variant);
    margin-inline: 16px;
    padding: 16px;
    margin-block-start: 24px;
    border-radius: var(--radius-large);
}

.about-card .card-title { color: var(--on-surface); }

.about-card .card-text {
    margin-block: 12px;
    padding-block: 12px;
    border-block: 1px solid var(--outline-variant);
}

.about-list {
    display: grid;
    gap: 12px;
}

.list-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.project-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
}

.resume-tab .list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px,1fr));
    gap: 24px;
    margin-block-end: 28px;
}

.resume-card {
    display: grid;
    gap: 4px;
}

.resume-card .card-subtitle {color: var(--primary); }

.resume-card .card-text { color: var(--on-surface-variant); }

.resume-bottom-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px,1fr));
    gap: 12px;
}

.resume-bottom-item {
    background-color: var(--surface-container);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    border-radius: var(--radius-small);
}

.resume-bottom-item .icon { height : 28px; }

.section-title { margin-block-end: 16px;}

.contact-tab {padding-block-end: 0; }

.contact-tab .container { padding-block-end: 24px;}

.contact-info,
.contact-info-list {
    display: grid;
    gap: 12px;
}

.contact-info {margin-block-end: 24px; }

.contact-info-list {
    padding-block-end: 12px;
    border-block-end: 1px solid var(--outline-variant);
}

.contact-info-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.contact-info .icon-box {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: grid;
    place-items: center;
    color: var(--on-surface-variant);
}

.info-content {
    display: grid;
    gap: 4px;
}

.info-title {
    color: var(--on-surface-variant);
    opacity: 0.6;
}

.info-text { color: var(--on-surface-variant); }

.social-list {
    display: flex;
    gap: 12px;
}

.social-item {padding: 12px; }

.input-wrapper {
    margin-block-start: 16px;
    display: grid;
    gap: 10px;
}

.contact-form {
    background-color: var(--surface-container);
    padding: 16px;
    margin-block-end: 16px;
    border-radius: var(--radius-medium);
}

.footer .container {
    text-align: center;
    padding: 16px;
    border-block-start: 1px solid var(--outline-variant);
}

/* responsive for larger than 768px screen  */

@media (min-width: 768px) {
    .article {
        position: relative;
        display: grid;
        grid-template-columns: 0.5fr 1fr;
        align-items: flex-start;
    }

    .about-card,
    .primary-tabs {
        position: sticky;
        top: 64px;
    }

    .primary-tabs {z-index :2; }

    .hero .container { grid-template-columns: 0.2fr 1fr;}


}

/* responsive for larger than 1000px screen  */

@media (min-width: 900px) {

    .container,
    .article {
        max-width: 900px;
        margin-inline: auto ;
    }

    .about-card { margin-inline: 6px; }

    .contact-tab .container {
        display: grid;
        align-items: flex-start;
        grid-template-columns: 0.6fr 1fr;
        gap: 24px;
    }

}