/**
 * Game Fonts
 */
@font-face {
    font-family: "Esteban";
    font-style: normal;
    font-weight: normal;
    src: local("Esteban"), url("../fonts/esteban.ttf") format("truetype");
}



/**
 * Properties
 */
:root {
    --main-color: #0588b2;
    --dialog-color: rgba(21, 26, 33, 0.9);
    --tool-bg: rgba(21, 26, 33, 0.94);
    --tool-border: rgba(255, 255, 255, 0.18);
    --tool-text: #f2f6fb;
    --muted-text: rgba(255, 255, 255, 0.64);

    --main-font: "Helvetica Nueue", Helvetica, Arial, sans-serif;
    --title-font: "Esteban", Georgia, serif;

    --border-radius: 12px;

    --z-dragging: 10;
    --z-selection: 100;
    --z-header: 200;
    --z-preview: 300;
    --z-dialog: 400;
}

body.light-theme {
    --main-color: #087fa0;
    --dialog-color: rgba(247, 250, 252, 0.96);
    --tool-bg: rgba(247, 250, 252, 0.96);
    --tool-border: rgba(15, 45, 60, 0.18);
    --tool-text: #172b36;
    --muted-text: #526671;
}



/**
 * Main Styles
 */
html, body {
    margin: 0;
    padding: 0;
    border: 0;
    width: 100%;
    height: 100%;
    font-family: var(--main-font);
    background-color: transparent;
    backface-visibility: hidden;
    overflow: hidden;
}
button {
    padding: 0;
    display: block;
    padding: 4px 8px;
    background-color: var(--main-color);
    border: none;
    box-shadow: 0 0 0 2px var(--main-color), inset 0 0 0 1px black;
    border-radius: 8px;
    color: black;
    font-family: var(--main-font);
    font-size: 13px;
    text-align: center;
    cursor: pointer;
}



/**
 * Header
 */
header {
    position: absolute;
    top: 54px;
    left: 32px;
    display: flex;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 16px 32px;
    max-width: calc(100vw - 300px - 64px);
    pointer-events: none;
    z-index: var(--z-header);
}
h1 {
    margin: 0;
    font-family: var(--title-font);
    font-size: 48px;
    line-height: 1;
    color: var(--main-color);
}
.menu,
.score,
.actions {
    box-sizing: border-box;
    display: none;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 12px;
    min-height: 48px;
    color: rgba(255, 255, 255, 0.8);
    background-color: var(--dialog-color);
    border-radius: var(--border-radius);
    pointer-events: all;
}
.menu li:not(:last-child) {
    margin-right: 16px;
}

.score {
    padding: 12px 24px;
}
.placed {
    padding-right: 4px;
}
.placed::after {
    content: "/";
    padding-left: 4px;
    opacity: 0.5;
}
.percent {
    padding-left: 24px;
}
.percent::after {
    content: "%";
    padding-left: 4px;
    opacity: 0.5;
}
.timer {
    padding-left: 24px;
}
.timer > span {
    opacity: 0.5;
}



/**
 * The Selection
 */
.selection {
    position: absolute;
    top: calc(50% + 24px);
    left: 50%;
    max-width: calc((300px + 32px) * 2);
    max-height: calc(100vh - 140px);
    padding: 24px 48px;
    transform: translate(-50%, -50%);
    background-color: var(--dialog-color);
    border-radius: calc(var(--border-radius) * 1.5);
    overflow: auto;
    z-index: var(--z-selection);
}
h2 {
    margin: 0;
    color: var(--main-color);
    font-size: 32px;
    font-family: var(--title-font);
    text-align: center;
}
.selection p {
    margin: 8px 0 0 0;
    color: rgba(255, 255, 255, 0.5);
    text-align: center;
}
.selection p b {
    color: white;
}
.selection p i {
    font-style: normal;
    color: green;
}
.selection-pack.selection-pack {
    margin-top: 16px;
}

.selection-tabs {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin: 8px 0;
    padding: 0;
    gap: 12px 8px;
}
.selection-tabs li {
    display: block;
    padding: 6px 20px;
    color: white;
    border: 1px solid white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.5s;
}
.selection-tabs li.selected {
    color: var(--main-color);
    border-color: var(--main-color);
}
.selection-tabs li:hover {
    color: white;
    border-color: var(--main-color);
}


.slider-container {
    position: relative;
    min-height: 380px;
}
.slider-content {
    overflow: hidden;
}
.slider-list {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    width: calc((100% / var(--slider-count)) * var(--slider-total));
    min-height: 400px;
    transform: translateX(0);
    transition: all 0.5s;
}
.slider-slide {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 16px;
    box-sizing: border-box;
    width: calc(100% / var(--slider-count));
}
.slider-image {
    position: relative;
    margin: 0 auto;
}
.slider-image h3 {
    position: absolute;
    top: -18px;
    left: -10px;
    margin: 0;
    color: var(--main-color);
    font-family: var(--title-font);
    font-size: 32px;
}
.slider-image h4 {
    position: absolute;
    margin: 0;
    bottom: -8px;
    right: -8px;
    color: white;
    font-family: var(--title-font);
    font-size: 20px;
}
.done.done {
    color: green;
}
.slider-image img {
    display: block;
    max-width: 300px;
    max-height: 300px;
    border-radius: var(--border-radius);
    overflow: hidden;
}
.selected .slider-image img {
    box-shadow: 0 0 0 2px var(--main-color);
}
.slider-slide ul {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 0;
    margin: 8px 0 0 0;
}
.slider-slide ul li {
    display: block;
    color: white;
    border: 1px solid white;
    border-radius: var(--border-radius);
    padding: 6px 12px;
    margin: 4px;
    cursor: pointer;
    transition: all 0.5s;
}
.slider-slide ul li:hover {
    border-color: var(--main-color);
}
.slider-slide ul li.completed {
    border-color: green;
    color: green;
}
.slider-slide ul li.selected {
    border-color: var(--main-color);
    color: var(--main-color);
}


.slider-nav {
    --slider-arrow-color: var(--main-color);
    --slider-arrow-width: 24px;
    --slider-arrow-height: 3px;
    --slider-arrow-space: -32px;
    --slider-arrow-gap: 16px;
}
.slider-nav a {
    position: absolute;
    display: block;
    top: 50%;
    width: 30px;
    height: 45px;
    padding: 0;
    border: none;
    background-color: transparent;
    cursor: pointer;
    pointer-events: all;
    outline: none;
    transform: translateY(-50%);
    z-index: 1;
}
.slider-nav a:before,
.slider-nav a:after {
    content: "";
    display: block;
    position: absolute;
    top: 50%;
    width: var(--slider-arrow-width);
    height: var(--slider-arrow-height);
    background-color: var(--slider-arrow-color);
    transition: all 0.2s;
}
.slider-nav a:before {
    transform: rotate(45deg);
}
.slider-nav a:after {
    transform: rotate(-45deg);
}
.slider-nav a:hover:before,
.slider-nav a:active:before {
    transform: rotate(35deg);
}
.slider-nav a:hover:after,
.slider-nav a:active:after {
    transform: rotate(-35deg);
}

.slider-prev.slider-prev {
    left: var(--slider-arrow-space);
}
.slider-prev:before,
.slider-prev:after {
    left: var(--slider-arrow-gap);
    transform-origin: left center;
}

.slider-next.slider-next {
    right: var(--slider-arrow-space);
}
.slider-next:before,
.slider-next:after {
    right: var(--slider-arrow-gap);
    transform-origin: right center;
}


.selection footer {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    height: 70px;
    gap: 16px;
}
.selection-desc.selection-desc {
    display: none;
    margin: 0;
}
.selection button {
    display: none;
    font-size: 18px;
    margin: 0 auto;
    padding: 8px 16px;
}



/**
 * The Dialogs
 */
.backdrop {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-dialog);
    background-color: rgba(21, 26, 33, 0.4);
}
.dialog {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    padding: 16px 32px;
    transform: translate(-50%, -50%);
    background-color: var(--dialog-color);
    border-radius: var(--border-radius);
}
.dialog p {
    margin: 16px 0 24px;
    color: white;
    text-align: center;
}
.dialog button {
    font-size: 18px;
    margin: 16px auto;
    padding: 8px 16px;
}



/**
 * The Puzzle
 */
.container {
    position: relative;
    z-index: 1;
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.table {
    position: relative;
    flex-grow: 2;
    overflow: auto;
    transition: zoom 160ms ease;
}
.content {
    display: none;
}
.board {
    position: relative;
    background-color: rgba(255, 255, 255, 0.2);
    border: 5px solid rgba(21, 26, 33);
}



/**
 * The Drawer
 */
.drawer {
    display: none;
    flex-direction: column;
    flex-shrink: 0;
    width: 218px;
    padding: 54px 0 0 0;
    border-left: 10px solid rgba(11, 16, 23);
    background-color: rgba(220, 220, 220, 0.3);
}
.actions {
    display: flex;
    gap: 16px;
    justify-content: stretch;
    width: calc(100% - 32px);
    margin: 0 16px;
}
.actions li {
    flex: 1;
}
.actions li button {
    width: 100%;
}

.primary,
.secondary {
    box-sizing: border-box;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: min-content;
    grid-gap: 8px;
    padding: 16px;
    height: calc(100vh - 54px - 48px);
    overflow: auto;
}
.secondary {
    display: none;
    border-top: 10px solid rgba(11, 16, 23);
}

.drawer-split .secondary {
    display: grid;
}
.drawer-split .primary,
.drawer-split .secondary {
    height: calc((100vh - 54px - 48px) / 2);
}



/**
 * The Preview
 */
.preview {
    display: none;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(21, 26, 33, 0.8);
    z-index: var(--z-preview);
}
.preview img {
    display: block;
    max-width: 90vw;
    max-height: 90vh;
}

.close {
    --close-color: var(
    --main-color);
    --close-size: 32px;
    --close-width: 32px;
    --close-height: 3px;

    position: absolute;
    top: 8vh;
    right: 5vw;
    width: var(--close-size);
    height: var(--close-size);
}
.close:before,
.close:after {
    content: "";
    display: block;
    position: absolute;
    top: 10px;
    left: 0;
    width: var(--close-width);
    height: var(--close-height);
    background-color: var(--close-color);
    transition: all 0.2s;
}
.close:before {
    transform: rotate(45deg);
}
.close:after {
    transform: rotate(-45deg);
}
.close:hover:before,
.close:active:before {
    transform: rotate(35deg);
}
.close:hover:after,
.close:active:after {
    transform: rotate(-35deg);
}


/* Floating corner controls inspired by the supplied reference. */
.corner-tools {
    position: fixed;
    inset: 16px 18px 18px;
    z-index: 250;
    pointer-events: none;
}
.corner-button,
.corner-group {
    box-sizing: border-box;
    min-height: 44px;
    border: 1px solid var(--tool-border);
    border-radius: 15px;
    color: var(--tool-text);
    background: var(--tool-bg);
    box-shadow: 0 5px 18px rgba(0, 0, 0, 0.16);
    backdrop-filter: blur(12px);
}
.corner-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 14px;
    font-size: 14px;
    font-weight: 650;
    line-height: 1;
    white-space: nowrap;
    pointer-events: auto;
    transition: transform 140ms ease, border-color 140ms ease, background-color 140ms ease;
}
.corner-button:hover {
    transform: translateY(-1px);
    border-color: var(--main-color);
    background-color: color-mix(in srgb, var(--tool-bg), var(--main-color) 12%);
}
.corner-button:active { transform: translateY(0) scale(0.97); }
.corner-button:focus-visible { outline: 3px solid var(--main-color); outline-offset: 3px; }
.corner-button > span { font-size: 20px; }
.corner-button b { font-weight: 650; }
.corner-group {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px;
    pointer-events: auto;
}
.corner-group .corner-button { min-width: 44px; }
.corner-button.corner-restart,
.corner-button.corner-settings,
.corner-button.corner-sound {
    position: absolute;
    pointer-events: auto;
}
.corner-button.corner-restart { top: 0; left: 0; display: none; }
.game-active .corner-button.corner-restart { display: inline-flex; }
.corner-button.corner-settings { bottom: 0; left: 0; }
.corner-button.corner-sound { bottom: 0; right: 0; }
.zoom-readout {
    min-width: 42px;
    color: var(--muted-text);
    font-size: 12px;
    text-align: center;
}
.corner-button[disabled] { opacity: 0.45; cursor: default; }

.settings-panel {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 500;
    padding: 20px;
    background: rgba(7, 13, 21, 0.66);
    backdrop-filter: blur(7px);
}
.settings-panel.open { display: grid; place-items: center; }
.settings-card {
    position: relative;
    box-sizing: border-box;
    width: min(560px, 100%);
    max-height: min(720px, calc(100dvh - 40px));
    overflow: auto;
    padding: 34px;
    border: 1px solid var(--tool-border);
    border-radius: 24px;
    color: var(--tool-text);
    background: var(--tool-bg);
    box-shadow: 0 24px 90px rgba(0, 0, 0, 0.35);
}
.settings-card h2 { margin: 4px 0 12px; }
.settings-card > p:not(.settings-kicker) { color: var(--muted-text); line-height: 1.65; text-align: center; }
.settings-kicker { margin: 0; color: var(--main-color); font-size: 11px; font-weight: 800; letter-spacing: 0.2em; text-align: center; }
.settings-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--tool-text);
    background: transparent;
    box-shadow: none;
    font-size: 24px;
}
.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 22px; }
.guide-grid > div { display: grid; gap: 6px; padding: 12px; border: 1px solid var(--tool-border); border-radius: 13px; }
.guide-grid kbd { color: var(--main-color); font: 700 13px var(--main-font); }
.guide-grid span { color: var(--muted-text); font-size: 12px; line-height: 1.45; }
.guide-done { min-width: 120px; margin: 24px auto 0; padding: 10px 18px; font-size: 15px; }

body.light-theme .selection-tabs li,
body.light-theme .slider-slide ul li { color: #243b46; border-color: rgba(25, 56, 70, 0.32); }
body.light-theme .selection p,
body.light-theme .dialog p { color: #526671; }
body.light-theme .selection p b { color: #172b36; }
body.light-theme .slider-slide ul li.completed,
body.light-theme .done.done { color: #18824d; border-color: #18824d; }
body.light-theme .selection p i { color: #18824d; }

@media (max-width: 700px) {
    .corner-tools { inset: 8px 8px 10px; }
    .corner-button { min-height: 40px; padding: 0 10px; border-radius: 13px; font-size: 12px; }
    .corner-button > span { font-size: 18px; }
    .corner-group { gap: 4px; padding: 4px; }
    .corner-group .corner-button { min-width: 38px; }
    .zoom-readout { min-width: 34px; font-size: 10px; }
    .corner-button.corner-restart { max-width: 42px; overflow: hidden; }
    .corner-button.corner-restart b { display: none; }
    .corner-button.corner-settings,
    .corner-button.corner-sound { width: 42px; padding: 0; overflow: hidden; }
    .corner-button.corner-settings b,
    .corner-button.corner-sound b { display: none; }
    .settings-panel { padding: 12px; }
    .settings-card { padding: 28px 18px 20px; border-radius: 18px; }
    .guide-grid { gap: 8px; }
    header { top: 58px; left: 12px; gap: 8px; max-width: calc(100vw - 24px); }
    h1 { font-size: 34px; }
    .selection {
        top: calc(50% + 8px);
        box-sizing: border-box;
        width: min(560px, calc(100vw - 24px));
        max-height: calc(100dvh - 112px);
        padding: 18px 24px;
    }
    .selection h2 { font-size: 27px; }
    .selection-tabs { gap: 6px; }
    .selection-tabs li { padding: 6px 12px; }
    .slider-container { min-height: 250px; }
    .slider-list { min-height: 265px; }
    .slider-slide { padding: 10px; }
    .slider-image img { max-width: min(220px, 52vw); max-height: min(210px, 30dvh); }
    .slider-slide ul li { padding: 6px 8px; margin: 3px; }
}

@media (max-width: 420px) {
    .corner-group { gap: 2px; }
    .corner-group .corner-button { min-width: 34px; padding: 0 7px; }
    .corner-group .corner-button b { display: none; }
    .corner-group .zoom-readout { display: none; }
}

@media (max-height: 620px) {
    header { top: 54px; }
    .selection {
        top: calc(50% + 6px);
        max-height: calc(100dvh - 86px);
        padding-top: 14px;
        padding-bottom: 14px;
    }
    .selection h2 { font-size: 25px; }
    .selection-pack.selection-pack { margin-top: 8px; }
    .slider-container { min-height: 190px; }
    .slider-list { min-height: 205px; }
    .slider-image img { max-height: 175px; }
    .selection footer { height: 58px; gap: 8px; }
    .corner-button.corner-settings,
    .corner-button.corner-sound { min-height: 38px; }
}



/**
 * A Single Piece
 */
.piece {
    cursor: grab;
}
body > .piece,
.table > .piece {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
}
body > .piece {
    cursor: grabbing;
    z-index: var(--z-dragging);
}
.board > .piece {
    position: absolute;
    cursor: auto;
    pointer-events: none;
}
.drawer-borders > div > :not(.border) {
    opacity: 0.1;
}



/**
 * A Set of Pieces
 */
.set {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    pointer-events: none;
}
.set > .piece {
    position: absolute;
    cursor: grab;
    pointer-events: all;
}
.dragging {
    cursor: grabbing;
    z-index: var(--z-dragging);
}



/**
 * The Scrollbars
 */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}
::-webkit-scrollbar,
::-webkit-scrollbar-corner {
    background-color: transparent;
}
::-webkit-scrollbar-thumb,
::-webkit-scrollbar-thumb {
    border-radius: 999px;
    border: 2px solid transparent;
    border-left-width: 2px;
}
::-webkit-scrollbar-thumb {
    box-shadow: 0 0 0 8px transparent inset;
}
:hover::-webkit-scrollbar-thumb {
    box-shadow: 0 0 0 8px rgba(11, 16, 23) inset;
}

/* Selected Ice-blue Star Ring wallpaper; UI remains above the scene. */
body {
    background-color: #07111f;
    background-image: linear-gradient(rgba(4, 12, 24, .16), rgba(4, 12, 24, .38)), url('../images/background-star-ring.jpg');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}
body.light-theme {
    background-image: linear-gradient(rgba(210, 229, 247, .10), rgba(9, 24, 42, .18)), url('../images/background-star-ring.jpg');
}
h1 { color: #7bdfff; text-shadow: 0 2px 12px #07111f, 0 0 24px rgba(60, 177, 228, .3); }
.selection { background-color: rgba(15, 25, 40, .93); border: 1px solid rgba(139, 210, 246, .25); box-shadow: 0 18px 70px rgba(0, 0, 0, .35); }
body.light-theme .selection { background-color: rgba(241, 248, 253, .95); }
.game-active .table { background-color: rgba(4, 12, 24, .22); }
.board { background-color: #14263a; border-color: #8cb3cd; box-shadow: 0 8px 36px rgba(0, 0, 0, .35); }
.drawer { background-color: rgba(12, 24, 40, .88); border-left-color: rgba(111, 171, 213, .28); }
body.light-theme .board { background-color: #dce8f0; border-color: #728fa6; }
body.light-theme .drawer { background-color: rgba(221, 234, 245, .9); }
.menu, .score { color: #e8f2fb; background-color: rgba(15, 25, 40, .94); }
@media (max-width: 700px) { body { background-position: 68% center; } }