styles.css

/* Constants */

:root {
    --icon-size: 24px;
    --primary-color: #4285f4;
    --peer-width: 120px;
    color-scheme: light dark;
}

/* Layout */

html {
    height: 100%;
}

html,
body {
    margin: 0;
    display: flex;
    flex-direction: column;
    width: 100%;
    overflow-x: hidden;
}

body {
    flex-grow: 1;
    align-items: center;
    justify-content: center;
    overflow-y: hidden;
}

.row-reverse {
    display: flex;
    flex-direction: row-reverse;
}

.row {
    display: flex;
    flex-direction: row;
}

.column {
    display: flex;
    flex-direction: column;
}

.center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.grow {
    flex-grow: 1;
}

.full {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    align-items: center;
    padding: 16px;
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}


/* Typography */

body {
    font-family: -apple-system, BlinkMacSystemFont, Roboto, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1 {
    font-size: 34px;
    font-weight: 400;
    letter-spacing: -.01em;
    line-height: 40px;
    margin: 8px 0 0;
}

h2 {
    font-size: 24px;
    font-weight: 400;
    letter-spacing: -.012em;
    line-height: 32px;
}

h3 {
    font-size: 20px;
    font-weight: 500;
    margin: 16px 0;
}

.font-subheading {
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

.font-body1,
body {
    font-size: 14px;
    font-weight: 400;
    line-height: 20px;
}

.font-body2 {
    font-size: 12px;
    line-height: 18px;
}

a {
    text-decoration: none;
    color: currentColor;
    cursor: pointer;
}



/* Icons */

.icon {
    width: var(--icon-size);
    height: var(--icon-size);
    fill: currentColor;
}



/* Shadows */

[shadow="1"] {
    box-shadow: 0 3px 4px 0 rgba(0, 0, 0, 0.14),
        0 1px 8px 0 rgba(0, 0, 0, 0.12),
        0 3px 3px -2px rgba(0, 0, 0, 0.4);
}

[shadow="2"] {
    box-shadow: 0 4px 5px 0 rgba(0, 0, 0, 0.14),
        0 1px 10px 0 rgba(0, 0, 0, 0.12),
        0 2px 4px -1px rgba(0, 0, 0, 0.4);
}




/* Animations */

@keyframes fade-in {
    0% {
        opacity: 0;
    }
}

/* Main Header */

body>header a {
    margin-left: 8px;
}

/* Peers List */

x-peers {
    width: 100%;
    overflow: hidden;
    flex-flow: row wrap;
    z-index: 2;
}

/* Empty Peers List */

x-no-peers {
    padding: 8px;
    text-align: center;
    /* prevent flickering on load */
    animation: fade-in 300ms;
    animation-delay: 500ms;
    animation-fill-mode: backwards;
}

x-no-peers h2,
x-no-peers a {
    color: var(--primary-color);
}

x-peers:not(:empty)+x-no-peers {
    display: none;
}



/* Peer */

x-peer {
    -webkit-user-select: none;
    user-select: none;
}

x-peer label {
    width: var(--peer-width);
    padding: 8px;
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    position: relative;
}

x-peer .name {
    width: var(--peer-width);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: center;
}

input[type="file"] {
    visibility: hidden;
    position: absolute;
}

x-peer x-icon {
    --icon-size: 40px;
    width: var(--icon-size);
    padding: 12px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    margin-bottom: 8px;
    transition: transform 150ms;
    will-change: transform;
}

x-peer:not([transfer]):hover x-icon,
x-peer:not([transfer]):focus x-icon {
    transform: scale(1.05);
}

x-peer[transfer] x-icon {
    box-shadow: none;
    opacity: 0.8;
    transform: scale(1);
}

.status,
.device-name {
    height: 18px;
    opacity: 0.7;
}

x-peer[transfer] .status:before {
    content: 'Transferring...';
}

x-peer:not([transfer]) .status,
x-peer[transfer] .device-name {
    display: none;
}

x-peer x-icon {
    animation: pop 600ms ease-out 1;
}

@keyframes pop {
    0% {
        transform: scale(0.7);
    }

    40% {
        transform: scale(1.2);
    }
}

x-peer[drop] x-icon {
    transform: scale(1.1);
}



/* Footer */

footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    align-items: center;
    padding: 0 0 16px 0;
    text-align: center;
}

footer .logo {
    --icon-size: 80px;
    margin-bottom: 8px;
    color: var(--primary-color);
}

footer .font-body2 {
    color: var(--primary-color);
}

@media (min-height: 800px) {
    footer {
        margin-bottom: 16px;
    }
}


/* Dialog */

x-dialog x-background {
    background: rgba(0, 0, 0, 0.61);
    z-index: 10;
    transition: opacity 300ms;
    will-change: opacity;
    padding: 16px;
}

x-dialog x-paper {
    z-index: 3;
    background: white;
    border-radius: 8px;
    padding: 16px 24px;
    width: 100%;
    max-width: 400px;
    box-sizing: border-box;
    transition: transform 300ms;
    will-change: transform;
}

x-dialog:not([show]) {
    pointer-events: none;
}

x-dialog:not([show]) x-paper {
    transform: scale(0.1);
}

x-dialog:not([show]) x-background {
    opacity: 0;
}

x-dialog .row-reverse>.button {
    margin-top: 16px;
    margin-left: 8px;
}

x-dialog a {
    color: var(--primary-color);
}

/* Receive Dialog */
#receiveDialog .row {
    margin-top: 24px;
    margin-bottom: 8px;
}

/* Receive Text Dialog */

#receiveTextDialog #text {
    width: 100%;
    word-break: break-all;
    max-height: 300px;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-user-select: all;
    -moz-user-select: all;
    user-select: all;
    white-space: pre-wrap;
}

#receiveTextDialog #text a {
    cursor: pointer;
}

#receiveTextDialog #text a:hover {
    text-decoration: underline;
}

#receiveTextDialog h3 {
    /* Select the received text when double-clicking the dialog */
    user-select: none;
    pointer-events: none;
}

/* Button */

.button {
    padding: 0 16px;
    box-sizing: border-box;
    min-height: 36px;
    min-width: 100px;
    font-size: 14px;
    line-height: 24px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
    background: inherit;
    color: var(--primary-color);
}

.button,
.icon-button {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    touch-action: manipulation;
    border: none;
    outline: none;
}

.button:before,
.icon-button:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: currentColor;
    opacity: 0;
    transition: opacity 300ms;
}

.button:hover:before,
.icon-button:hover:before {
    opacity: 0.1;
}

.button:before {
    border-radius: 8px;
}

.button:focus:before,
.icon-button:focus:before {
    opacity: 0.2;
}



button::-moz-focus-inner {
    border: 0;
}


/* Icon Button */

.icon-button {
    width: 40px;
    height: 40px;
}

.icon-button:before {
    border-radius: 50%;
}



/* Text Input */

.textarea {
    box-sizing: border-box;
    border: none;
    outline: none;
    padding: 16px 24px;
    border-radius: 16px;
    margin: 8px 0;
    font-size: 14px;
    font-family: inherit;
    background: #f1f3f4;
    display: block;
    overflow: auto;
    resize: none;
    min-height: 40px;
    line-height: 16px;
    max-height: 300px;
}


/* Info Animation */

#about {
    color: white;
    z-index: 11;
    overflow: hidden;
    pointer-events: none;
    text-align: center;
}

#about .fade-in {
    transition: opacity 300ms;
    will-change: opacity;
    transition-delay: 300ms;
    z-index: 11;
    pointer-events: all;
}

#about:not(:target) .fade-in {
    opacity: 0;
    pointer-events: none;
    transition-delay: 0;
}

#about .logo {
    --icon-size: 96px;
}

#about x-background {
    position: absolute;
    top: calc(32px - 200px);
    right: calc(32px - 200px);
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: var(--primary-color);
    transform: scale(0);
    z-index: -1;
}

/* Hack such that initial scale(0) isn't animated */
#about x-background {
    will-change: transform;
    transition: transform 800ms cubic-bezier(0.77, 0, 0.175, 1);
}

#about:target x-background {
    transform: scale(10);
}

#about .row a {
    margin: 8px 8px -16px;
}


/* Loading Indicator */

.progress {
    width: 80px;
    height: 80px;
    position: absolute;
    top: 0px;
    clip: rect(0px, 80px, 80px, 40px);
    --progress: rotate(0deg);
    transition: transform 200ms;
}

.circle {
    width: 72px;
    height: 72px;
    border: 4px solid var(--primary-color);
    border-radius: 40px;
    position: absolute;
    clip: rect(0px, 40px, 80px, 0px);
    will-change: transform;
    transform: var(--progress);
}

.over50 {
    clip: rect(auto, auto, auto, auto);
}

.over50 .circle.right {
    transform: rotate(180deg);
}


/* Generic placeholder */
[placeholder]:empty:before {
    content: attr(placeholder);
}

/* Toast */

.toast-container {
    padding: 0 8px 24px;
    overflow: hidden;
    pointer-events: none;
}

x-toast {
    position: absolute;
    min-height: 48px;
    bottom: 24px;
    width: 100%;
    max-width: 344px;
    background-color: #323232;
    color: rgba(255, 255, 255, 0.95);
    align-items: center;
    box-sizing: border-box;
    padding: 8px 24px;
    z-index: 20;
    transition: opacity 200ms, transform 300ms ease-out;
    cursor: default;
    line-height: 24px;
    border-radius: 8px;
    pointer-events: all;
}

x-toast:not([show]):not(:hover) {
    opacity: 0;
    transform: translateY(100px);
}


/* Instructions */

x-instructions {
    position: absolute;
    top: 120px;
    opacity: 0.5;
    transition: opacity 300ms;
    z-index: -1;
    text-align: center;
}

x-instructions:before {
    content: attr(mobile);
}

x-peers:empty~x-instructions {
    opacity: 0;
}


/* Responsive Styles */

@media (min-height: 800px) {
    footer {
        margin-bottom: 16px;
    }
}

@media screen and (min-height: 800px),
screen and (min-width: 1100px) {
    x-instructions:before {
        content: attr(desktop);
    }
}

@media (max-height: 420px) {
    x-instructions {
        top: 24px;
    }

    footer .logo {
        --icon-size: 40px;
    }
}

/* 
    iOS specific styles
*/
@supports (-webkit-overflow-scrolling: touch) {

    
    html {
        position: fixed;
    }

    x-instructions:before {
        content: attr(mobile);
    }
}

/*
    Color Themes
*/

/* Default colors */
body {
    --text-color: #333;
    --bg-color: #fff;
    --bg-color-secondary: #f1f3f4;
}

/* Dark theme colors */
body.dark-theme {
    --text-color: #eee;
    --bg-color: #121212;
    --bg-color-secondary: #333;
}

/* Colored Elements */
body {
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.5s ease;
}

x-dialog x-paper {
    background-color: var(--bg-color);
}

.textarea {
    color: var(--text-color);
    background-color: var(--bg-color-secondary);
}
/* Image Preview */
#img-preview{
    max-height: 50vh;
    margin: auto;
    display: block;
}


/* Styles for users who prefer dark mode at the OS level */
@media (prefers-color-scheme: dark) {

    /* defaults to dark theme */
    body {
        --text-color: #eee;
        --bg-color: #121212;
        --bg-color-secondary: #333;
    }

    /* Override dark mode with light mode styles if the user decides to swap */
    body.light-theme {
        --text-color: #333;
        --bg-color: #fafafa;
        --bg-color-secondary: #f1f3f4;
    }
}


/* 
    Edge specific styles
*/
@supports (-ms-ime-align: auto) {

    html,
    body {
        overflow: hidden;
    }
}