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

:root {
    --bg: hsl(220deg 20% 10%);
    --bg_alt: hsl(220deg 20% 20%);
    --text: hsl(220deg 20% 90%);
    --text_alt: hsl(220deg 10% 60%);
    --accent: hsl(220deg 60% 60%);
    --accent_1: hsl(220deg 60% 50%);
    --accent_2: hsl(220deg 60% 40%);
    --accent_3: hsl(220deg 60% 30%);
    --accent_warn: hsl(0deg 60% 60%);
    --accent_disabled: hsl(220deg 10% 50%);
    --border: hsl(220deg 20% 60%);
    --bg_error: hsla(0deg, 40%, 70%, 0.95);
    --text_error: hsl(220deg 20% 10%);
}

/* layout */

body {
    margin: 0;
    color: var(--text);
    background-color: var(--bg);
    font-family:
        Helvetica Neue,
        Helvetica,
        Arial,
        sans-serif;
    height: 100dvh;
    min-width: 380px;
}

header {
    text-align: center;
    height: 40px;
    line-height: 40px;
    font-weight: bold;
    font-size: 1.1em;
    cursor: alias;
}

div#container {
    height: calc(100dvh - 68px);
    overflow-y: auto;
}
main {
    display: none;
    background-color: var(--bg_alt);
    margin: 5px auto;
    padding: 15px 15px;
    width: calc(100vw - 36px);
    max-width: 900px;
    min-width: 375px;
    border-radius: 5px;
    overflow: hidden;
}
main#progress {
    margin-top: calc(50dvh - 50px);
    padding: 0;
}
#progress_bar {
    background-color: var(--accent);
    height: 5px;
    transition: width 100ms ease-in-out;
}
main#progress.error > #progress_bar {
    background-color: var(--accent_warn);
    width: 100% !important;
}
#progress_status {
    padding: 5px 15px;
    text-align: center;
}
div#container[data-view="create"] > main#create {
    display: block;
}
div#container[data-view="received"] > main#received {
    display: block;
}
div#container[data-view="progress"] > main#progress {
    display: block;
}
div#container[data-view="uploaded"] > main#uploaded {
    display: block;
}

footer {
    display: flex;
    justify-content: center;
    height: 28px;
    line-height: 28px;
}
footer > a {
    width: 90px;
    color: var(--accent);
    text-align: center;
    text-decoration: unset;
}

dialog {
    background-color: var(--bg_alt);
    color: var(--text);
    position: absolute;
    top: 0;
    min-width: calc(min(100vw, 400px));
    width: calc(100vw - 40px);
    max-width: 1000px;
    margin: 10px auto;
    padding: 15px 20px;
    border: none;
    border-radius: 5px;
    outline: none;
    overflow-x: hidden;
    text-wrap: wrap;
}
dialog:not(#error) {
    max-height: calc(100dvh - 45px);
    overflow-y: auto;
}
dialog:not(#error) a,
dialog:not(#error) h1,
dialog:not(#error) h2 {
    color: var(--accent);
}
dialog#error {
    background-color: var(--bg_error);
    color: var(--text_error);
    min-height: 40px;
    font-weight: bold;
}

/* form */

label {
    display: block;
    margin-bottom: 5px;
}
input,
select {
    color: var(--text);
    background-color: unset;
    display: block;
    width: 100%;
    height: 34px;
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: 7px 10px;
    outline: 0;
    margin-bottom: 15px;
}
input:user-invalid,
select:user-invalid {
    border-color: var(--accent_warn);
}
option {
    background-color: var(--bg);
    color: var(--text);
}
option:disabled {
    color: var(--text_alt);
}
input[type="submit"] {
    margin: 20px auto 0 auto;
    max-width: 200px;
}

::placeholder {
    color: var(--text_alt);
}

.input_group {
    display: grid;
    grid-template-columns: 1fr 34px;
}
.input_group > input {
    border-radius: 5px 0 0 5px;
    border-right: unset;
}
.input_group > a {
    display: block;
    height: 34px;
    line-height: 32px;
    border: 1px solid var(--accent);
    border-radius: 0 5px 5px 0;
    text-align: center;
}

.input_group > a,
input[type="submit"] {
    background-color: var(--accent_1);
    border-color: var(--accent_1);
    font-weight: bold;
    cursor: pointer;
}
input[type="submit"]:disabled {
    background-color: var(--accent_disabled);
    border-color: var(--accent_disabled);
    cursor: not-allowed;
}
.input_group > a:hover,
input[type="submit"]:not(:disabled):hover {
    background-color: var(--accent_2);
    border-color: var(--accent_2);
}
.input_group > a:active,
input[type="submit"]:not(:disabled):active {
    background-color: var(--accent_3);
    border-color: var(--accent_3);
}

div.editor {
    position: relative;
    min-height: 54px;
    height: 94px;
    border: 1px solid var(--border);
    margin-bottom: 15px;
    border-radius: 5px;
    overflow: hidden;
    resize: vertical;
}
#received > div.editor {
    height: 40dvh;
}
div.editor > .preview,
div.editor > .message {
    background-color: transparent;
    position: absolute;
    width: 100%;
    height: 100%;
    line-height: 20px;
    padding: 7px 10px;
    border: unset;
    margin: unset;
    outline: none;
    font-size: 1.1em;
    overscroll-behavior: none;
    resize: none;
    white-space: pre-wrap;
    word-wrap: break-word;
    word-break: normal;
    overflow-wrap: break-word;
    tab-size: 2;
    font-family: monospace;
    overflow: auto;
}
div.editor > .preview {
    pointer-events: none;
}
div.editor > .message {
    color: transparent;
    caret-color: var(--text);
}

div.attachments {
    max-width: 600px;
    max-height: 40dvh;
    overflow-y: auto;
    margin: 0 auto;
}
div.attachments > div {
    display: grid;
    grid-template-columns: 1fr 60px 100px;
}
div.attachments > label {
    line-height: 25px;
    text-align: center;
    cursor: pointer;
}
div.attachments > * {
    padding: 5px 10px;
    height: 35px;
    border-width: 1px;
    border-top-width: 0;
    border-style: dotted;
    border-color: var(--border);
}
div.attachments > *:first-child {
    border-top-width: 1px;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
}
div.attachments > *:last-child {
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
    margin-bottom: 5px;
}
div.attachments > div > * {
    height: 25px;
    line-height: 25px;
    overflow: hidden;
    text-overflow: ellipsis;
}
div.attachments > div > *:not(:first-child) {
    text-align: center;
}
div.attachments > div > a {
    color: var(--accent_warn);
    text-decoration: unset;
}
div.attachments
    > div:not([data-state="ready"]):not([data-state="encrypt"]):not(
        [data-state="challenge"]
    )
    > a {
    display: none;
}
div.attachments
    > div:not([data-state="ready"]):not([data-state="encrypt"]):not(
        [data-state="challenge"]
    ) {
    cursor: wait;
}
div.attachments > div[data-state="encrypt"],
div.attachments > div[data-state="challenge"] {
    cursor: progress;
}
div.attachments
    > div:not([data-state="ready"]):not([data-state="challenge"]):not(
        [data-state="download"]
    ):not([data-state="decompress"])
    > small:after {
    content: "...";
}
input[type="file"] {
    display: none;
}

/* markdown formatting */

.header {
    font-weight: bolder;
}
.code,
.codeblock {
    background-color: var(--bg);
}
.marker {
    color: var(--accent);
}

/* generic */

a {
    cursor: pointer;
    user-select: none;
}

/* responsive */
@media only screen and (min-width: 600px) {
    form > div:first-child {
        display: grid;
        grid-template-columns: 1fr 230px;
        grid-column-gap: 20px;
    }
}