:root {
    --start: rgb(107, 170, 232);
    --end: rgb(230, 149, 56);
    --misc: rgb(230, 230, 230);

    @media (prefers-color-scheme: dark) {
        --fg: #E0E0E0;
        --bg: #222222;
        --invalid-key-bg: #000000;
        --invalid-key-fg: #ffffff;
    }

    @media (prefers-color-scheme: light) {
        --fg: #333333;
        --bg: #f5f5f5;
        --invalid-key-bg: #ffffff;
        --invalid-key-fg: #000000;
    }
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    color: var(--fg);
    background-color: var(--bg);
    font-family: ui-sans-serif, system-ui, Inter, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    touch-action: manipulation;
    user-select: none;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100dvh;
}

header {
    overscroll-behavior: none;
    text-align: center;
    padding: 20px;
    border-bottom: solid 1px var(--fg);
}

footer {
    padding: 20px;
    border-top: solid 1px var(--fg);
    display: none;
}

footer.visible {
    display: block;
}

header h1 {
    margin: 0;
    padding: 0;
    font-size: 24px;
    font-weight: normal;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

#message {
    position: fixed;
    top: 50px;
    left: 50%;
    transform: translateX(-50%) scale(.85);
    background: red;
    color: white;
    padding: 10px 14px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .25), 0 1px 0 rgba(255, 255, 255, .2) inset;
    opacity: 0;
    pointer-events: none;
    z-index: 1000;
}

#message.show {
    animation:
        pop-in 320ms cubic-bezier(.34, 1.56, .64, 1) both,
        fade-out 260ms ease 2300ms forwards;
}

#message.show::before {
    opacity: 1;
    animation: slam-ring 460ms ease-out both;
}

@keyframes pop-in {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px) scale(.75);
    }

    60% {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1.08);
    }

    100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}

@keyframes slam-ring {
    0% {
        box-shadow: 0 0 0 0 rgba(229, 57, 53, .55);
    }

    100% {
        box-shadow: 0 0 0 16px rgba(229, 57, 53, 0);
    }
}

@keyframes fade-out {
    to {
        opacity: 0;
        transform: translateX(-50%) translateY(-6px) scale(.98);
    }
}

main {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    overscroll-behavior: contain;
    padding-bottom: 20px;
}

main section {
    max-width: 500px;
    text-align: center;
    display: flex;
    flex-direction: column;
    padding: 0 20px;
}

section.history-screen {
    width: 100%;
    padding: 20px;
    gap: 12px;
}

.buttons {
    display: flex;
    justify-content: space-evenly;
    gap: 10px;
}

.hard-mode-option {
    margin-top: 12px;
}

.hard-mode-option label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.hard-mode-option input {
    width: 16px;
    height: 16px;
    margin: 0;
}

#play, #share, #copy, #practice, #history {
    flex: 1;
    height: 32px;
    border: solid 1px var(--fg);
    border-radius: 8px;
    color: black;
    cursor: pointer;
    font-size: 16px;
    box-shadow: 0 2px 5px var(--fg);
}

button#back {
    position: absolute;
    left: 10px;
    top: 20px;
    height: 24px;
    width: 24px;
    border: solid 1px var(--fg);
    border-radius: 12px;
    color: white;
    cursor: pointer;
    font-size: 16px;
    line-height: 0;
    padding: 0;
    box-shadow: 0 2px 5px var(--fg);
    background-color: red;
    display: none;
}

button#back svg {
    width: 16px;
    height: 16px;
    display: block;
    margin: 0 auto;
}

button#reset {
    position: absolute;
    left: 42px;
    top: 20px;
    height: 24px;
    width: 24px;
    border: solid 1px var(--fg);
    border-radius: 12px;
    color: white;
    cursor: pointer;
    font-size: 16px;
    line-height: 0;
    padding: 0;
    box-shadow: 0 2px 5px var(--fg);
    background-color: var(--end);
    display: none;
}

button#reset svg {
    width: 16px;
    height: 16px;
    display: block;
    margin: 0 auto;
}

button#back.visible {
    display: block;
}

button#play {
    background-color: var(--start);
}

button#share {
    background-color: var(--start);
}

button#copy {
    background-color: var(--misc);
}

button#practice {
    background-color: var(--end);
}

button#history {
    background-color: var(--misc);
}

.board {
    position: relative;
    display: grid;
    grid-template-columns: repeat(5, 42px);
    gap: 8px;
    padding: 20px;
    max-width: 500px;
    margin: 0 auto;
}

.board-container {
    position: relative;
    width: fit-content;
    margin: 0 auto;
}

.board-container .board {
    margin: 0;
}

.cell {
    box-sizing: border-box;
    width: 42px;
    height: 42px;
    border: 1px solid var(--fg);
    border-radius: 8px;
    color: black;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    text-transform: uppercase;
}

.cell.current {
    outline: 1px dashed var(--fg);
    outline-offset: 2px;
}

#keyboard {
    width: 500px;
    max-width: 100%;
    margin: 0 auto;
}

.row {
    display: flex;
    gap: 6px;
    margin-bottom: 6px;
    width: 100%;
}

.spacer {
    flex: 0.5;
}

.key {
    flex: 1;
    height: 42px;
    border: solid 1px var(--fg);
    border-radius: 8px;
    background-color: white;
    color: black;
    cursor: pointer;
    font-size: 16px;
    box-shadow: 0 2px 5px var(--fg);
    text-transform: uppercase;
}

.key.invalid {
    background-color: var(--invalid-key-bg);
    color: var(--invalid-key-fg);
    opacity: 0.65;
    box-shadow: none;
    cursor: not-allowed;
}

button:hover {
    filter: brightness(0.9);
    box-shadow: none;
}

.key.invalid:hover {
    filter: none;
    box-shadow: none;
}

button.delete-word {
    position: absolute;
    left: calc(100% - 10px);
    transform: translateY(-50%);
    height: 30px;
    width: 30px;
    border: solid 1px var(--fg);
    border-radius: 8px;
    background-color: #d9534f;
    color: white;
    cursor: pointer;
    font-size: 12px;
    padding: 0;
    box-shadow: 0 2px 5px var(--fg);
    display: flex;
    align-items: center;
    justify-content: center;
}

button.delete-word svg {
    width: 16px;
    height: 16px;
    display: block;
    pointer-events: none;
}

.key-wide {
    flex: 1.5;
}

.start {
    background: var(--start)
}

.end {
    background: var(--end);
}

.misc {
    background: var(--misc);
}

h2 {
    margin: 0;
    padding: 0;
    font-size: 16px;
    font-weight: normal;
    letter-spacing: 0.2em;    
}

.stats {
    display: grid;
    grid-template-columns: auto auto;
    column-gap: 0.5rem;
    row-gap: 0.25rem;
    align-items: center;
    justify-content: center;
}

.stats dt {
    text-align: right;
}

.stats dd {
    margin: 0;
    text-align: left;
}

#history-list {
    width: 100%;
    margin: 0;
    padding: 12px;
    text-align: left;
    text-transform: none;
    display: flex;
    flex-direction: column;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, Liberation Mono, Courier New, monospace;
    font-size: 14px;
    line-height: 1.4;
}

.history-entry {
    white-space: normal;
    margin-bottom: 8px;
}

.history-top,
.history-bottom {
    display: inline;
}

.history-bottom {
    display: block;
}

.history-bottom::before {
    content: "";
}