:root {
    --cs-blue: #79c9eb;
    --cs-blue-dark: #176a8d;
    --cs-water: #27a9e1;
    --cs-brown: #6d371f;
    --cs-brown-dark: #3d2015;
    --cs-copper: #a65f22;
    --cs-cream: #fff8ea;
    --cs-paper: #fffcf4;
    --cs-green: #3f7a42;
    --cs-red: #b8322a;
    --cs-ink: #243239;
    --cs-shadow: 0 18px 46px rgba(52, 28, 16, .2);
}

.csomester-app,
.csomester-app * { box-sizing: border-box; }

.csomester-app {
    width: min(1480px, 100%);
    margin: 0 auto;
    overflow: hidden;
    border: 1px solid #d6b995;
    border-radius: 26px;
    color: var(--cs-ink);
    background: var(--cs-paper);
    box-shadow: var(--cs-shadow);
    font-family: "Trebuchet MS", Arial, sans-serif;
}

.csomester-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 22px 30px;
    color: #fff;
    background:
        linear-gradient(105deg, rgba(55, 25, 13, .95), rgba(121, 64, 29, .87)),
        url("../images/workbench-grid.png") center 24% / cover;
}

.csomester-title-row { display: flex; align-items: center; gap: 16px; }
.csomester-title-row > img { width: 72px; height: 72px; object-fit: contain; filter: drop-shadow(0 5px 4px rgba(0, 0, 0, .35)); }
.csomester-eyebrow { margin: 0 0 4px; color: #bdefff; font-size: .74rem; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.csomester-header h1 { margin: 0; font-size: clamp(2rem, 4vw, 3rem); line-height: 1; }
.csomester-subtitle { max-width: 700px; margin: 8px 0 0; color: #fff3dc; }
.csomester-header__actions { display: flex; align-items: center; gap: 10px; }

.csomester-sound,
.csomester-logout {
    min-width: 46px;
    min-height: 44px;
    padding: 10px 14px;
    border: 1px solid rgba(255, 255, 255, .45);
    border-radius: 12px;
    color: #fff;
    background: rgba(20, 11, 7, .32);
    text-decoration: none;
    cursor: pointer;
}

.csomester-layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); }
.csomester-sidebar { padding: 22px; border-right: 1px solid #dfc7aa; background: #f9eedb; }
.csomester-sidebar > label,
.csomester-label { display: block; margin-bottom: 6px; color: #6b4a35; font-size: .72rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.csomester-sidebar select { width: 100%; min-height: 44px; padding: 8px 10px; border: 2px solid #c8a984; border-radius: 10px; background: #fff; font-weight: 750; }
.csomester-level-meta { display: flex; justify-content: space-between; gap: 8px; margin: 12px 0 9px; color: var(--cs-blue-dark); font-size: .82rem; font-weight: 900; }
#csomester-level-description { margin: 0 0 18px; color: #6b5b4f; font-size: .88rem; line-height: 1.45; }

.csomester-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 15px 0; }
.csomester-stats div { padding: 10px 6px; border: 1px solid #dfc6a7; border-radius: 12px; background: rgba(255, 255, 255, .76); text-align: center; }
.csomester-stats strong { display: block; color: var(--cs-brown-dark); font-size: 1.35rem; }
.csomester-stats span { display: block; margin-top: 2px; color: #806b5c; font-size: .68rem; font-weight: 800; }

.csomester-history { display: flex; min-height: 42px; gap: 5px; overflow-x: auto; padding: 6px; border: 1px solid #dbc2a4; border-radius: 10px; background: #fff; }
.csomester-history span { display: grid; flex: 0 0 29px; place-items: center; width: 29px; height: 29px; border-radius: 7px; color: #fff; background: var(--cs-blue-dark); font-weight: 900; }

.csomester-reset,
.csomester-next,
.csomester-check,
.csomester-builder-test,
.csomester-builder-edit {
    min-height: 44px;
    padding: 10px 16px;
    border: 0;
    border-radius: 11px;
    color: #fff;
    background: var(--cs-brown-dark);
    box-shadow: 0 4px 0 #24130d;
    font-weight: 900;
    cursor: pointer;
}

.csomester-sidebar > .csomester-reset { width: 100%; margin-top: 13px; }
.csomester-clear-progress { width: 100%; margin-top: 10px; padding: 9px; border: 1px solid #c78f82; border-radius: 10px; color: #853127; background: transparent; font-weight: 800; cursor: pointer; }
.csomester-clear-progress:hover { background: #fff0eb; }
.csomester-reset:active,
.csomester-next:active,
.csomester-check:active { transform: translateY(2px); box-shadow: 0 2px 0 #24130d; }

.csomester-stage { display: grid; grid-template-columns: minmax(0, 1fr) 270px; grid-template-rows: auto auto; min-width: 0; padding: 20px; background: #fffaf1; }
.csomester-message { grid-column: 1 / -1; min-height: 48px; margin-bottom: 13px; padding: 13px 16px; border: 1px solid #b8ddea; border-radius: 13px; color: #19546b; background: #e8f8ff; font-weight: 800; text-align: center; }
.csomester-message--ok { color: #165e38; border-color: #96d5b0; background: #e3f7ea; }
.csomester-message--error { color: #8e2620; border-color: #e5a49e; background: #fff0ee; }

.csomester-board {
    display: grid;
    grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
    grid-template-rows: repeat(var(--rows), minmax(0, 1fr));
    width: 100%;
    max-height: 680px;
    aspect-ratio: var(--cols) / var(--rows);
    overflow: hidden;
    border: 9px solid #5d321f;
    border-radius: 18px;
    outline: 3px solid #9b6442;
    background:
        radial-gradient(ellipse at 17% 21%, rgba(56, 25, 10, .34) 0 2.2%, transparent 2.8%),
        radial-gradient(ellipse at 74% 68%, rgba(49, 20, 8, .3) 0 1.8%, transparent 2.5%),
        linear-gradient(104deg, rgba(255, 214, 142, .12), transparent 26%, rgba(63, 25, 9, .13) 58%, transparent 82%),
        #945125;
    box-shadow: inset 0 0 34px rgba(36, 16, 7, .46), 0 11px 23px rgba(83, 46, 24, .24);
}

.csomester-cell {
    position: relative;
    display: grid;
    min-width: 0;
    min-height: 0;
    place-items: center;
    overflow: hidden;
    padding: 0;
    border: 0;
    box-shadow: inset 0 0 0 1px rgba(111, 218, 244, .78);
    background: rgba(118, 194, 220, .035);
    cursor: pointer;
    touch-action: manipulation;
}

.csomester-cell:hover,
.csomester-cell:focus-visible,
.csomester-cell.is-drop-target { z-index: 8; outline: 4px solid #fff3a3; background: rgba(255, 243, 163, .28); }
.csomester-cell--blocked,
.csomester-cell--source,
.csomester-cell--target { cursor: not-allowed; }
.csomester-rock,
.csomester-endpoint { z-index: 2; width: 94%; height: 94%; object-fit: contain; filter: drop-shadow(0 4px 3px rgba(0, 0, 0, .4)); pointer-events: none; }
.csomester-pipe { z-index: 2; width: 104%; height: 104%; max-width: none; max-height: none; object-fit: fill; transform: rotate(var(--pipe-rotation)); transform-origin: center; filter: drop-shadow(0 3px 2px rgba(0, 0, 0, .35)); pointer-events: none; transition: transform .16s ease, filter .2s ease; }
.csomester-house { width: 94%; height: 94%; }
.csomester-cell--pipe.is-flowing .csomester-pipe { filter: drop-shadow(0 0 8px #7fe2ff) saturate(1.25); }
.csomester-cell--pipe.is-leaking { z-index: 6; outline: 4px solid #e64135; background: rgba(255, 72, 61, .2); animation: csomester-leak-pulse .75s ease-in-out infinite alternate; }
.csomester-leak { position: absolute; z-index: 4; right: -5px; bottom: -7px; font-size: clamp(.85rem, 2vw, 1.45rem); filter: drop-shadow(0 2px 1px #fff); pointer-events: none; }
@keyframes csomester-leak-pulse { to { outline-color: #ffb0a9; } }

.csomester-board--editing .csomester-cell { background: rgba(255, 255, 255, .08); cursor: crosshair; }
.csomester-board--shake { animation: csomester-shake .32s ease; }
@keyframes csomester-shake {
    25% { transform: translateX(-8px); }
    50% { transform: translateX(8px); }
    75% { transform: translateX(-4px); }
}

.csomester-palette { align-self: start; margin-left: 16px; padding: 14px; border: 1px solid #d8bea0; border-radius: 16px; background: #f7ead8; }
.csomester-palette__heading { display: flex; align-items: stretch; flex-direction: column; gap: 10px; margin-bottom: 12px; }
.csomester-palette h2 { margin: 0; color: var(--cs-brown-dark); font-size: 1.05rem; }
.csomester-rotate-selection { min-height: 39px; padding: 8px 12px; border: 1px solid #9ebdcc; border-radius: 10px; color: #174f68; background: #eefaff; font-weight: 850; cursor: pointer; }
.csomester-pipe-tools { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.csomester-pipe-tool { display: grid; grid-template-rows: 58px auto auto; place-items: center; min-width: 0; padding: 8px 6px; border: 2px solid #c5a47c; border-radius: 13px; color: #53331f; background: #fff; cursor: grab; }
.csomester-pipe-tool img { width: 58px; height: 58px; object-fit: contain; pointer-events: none; }
.csomester-pipe-tool span { font-size: .78rem; font-weight: 900; }
.csomester-pipe-tool small { margin-top: 2px; color: #8a7564; font-size: .62rem; }
.csomester-pipe-tool:hover { transform: translateY(-2px); box-shadow: 0 6px 12px rgba(66, 36, 19, .13); }
.csomester-pipe-tool.active { color: #fff; border-color: var(--cs-blue-dark); background: var(--cs-blue-dark); cursor: grabbing; }
.csomester-pipe-tool.active small { color: #d8f5ff; }
.csomester-pipe-tool.is-dragging { opacity: .55; }
.csomester-pipe-tool--action { cursor: pointer; }
.csomester-pipe-tool--hammer { border-color: #c98578; cursor: pointer; }
.csomester-pipe-tool--hammer.active { border-color: #7f1d1d; background: var(--cs-red); }
.csomester-tool-emoji { display: grid; place-items: center; height: 58px; font-size: 2.2rem !important; }
.csomester-check { display: block; width: min(420px, 100%); margin: 14px auto 0; background: var(--cs-blue-dark); box-shadow: 0 4px 0 #0e4258; font-size: 1rem; }
.csomester-key-hint { margin: 10px 0 0; color: #775e4b; font-size: .74rem; text-align: center; }
.csomester-broken-guide { display: grid; grid-template-columns: 46px 46px 1fr; align-items: center; gap: 7px; margin-top: 11px; padding: 8px; border: 1px dashed #b87333; border-radius: 10px; color: #70401f; background: #fff7e7; font-size: .7rem; font-weight: 800; line-height: 1.25; }
.csomester-broken-guide img { width: 44px; height: 44px; object-fit: contain; }

.csomester-student-builder[hidden],
.csomester-palette[hidden],
.csomester-stats[hidden],
.csomester-history-wrap[hidden],
.csomester-reset[hidden],
.csomester-check[hidden],
.csomester-builder-test[hidden],
.csomester-builder-edit[hidden] { display: none !important; }

.csomester-student-builder { margin: 15px 0; padding: 13px; border: 1px solid #caa980; border-radius: 13px; background: #fff9ed; }
.csomester-student-builder h2 { margin: 0 0 4px; color: var(--cs-brown-dark); font-size: 1rem; }
.csomester-student-builder > p { margin: 0 0 10px; color: #786452; font-size: .76rem; line-height: 1.35; }
.csomester-builder-size { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin-bottom: 9px; }
.csomester-builder-size label { font-size: .68rem; font-weight: 800; }
.csomester-builder-size input { width: 100%; min-height: 34px; margin-top: 3px; padding: 5px 7px; border: 1px solid #c9aa86; border-radius: 7px; }
.csomester-builder-tools { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.csomester-builder-tools button { display: flex; align-items: center; gap: 6px; min-height: 41px; padding: 6px; border: 1px solid #bea17e; border-radius: 8px; color: #5d412e; background: #fff; font-size: .72rem; font-weight: 850; cursor: pointer; }
.csomester-builder-tools button.active { color: #fff; border-color: var(--cs-brown-dark); background: var(--cs-brown-dark); }
.csomester-builder-tools img,
.csomester-builder-tools span { width: 28px; height: 28px; object-fit: contain; text-align: center; font-size: 1.2rem; }
.csomester-builder-test,
.csomester-builder-edit { width: 100%; margin-top: 9px; background: var(--cs-blue-dark); box-shadow: none; }
.csomester-builder-edit { background: var(--cs-brown-dark); }
.csomester-builder-status { min-height: 30px; margin: 8px 0 0 !important; font-size: .72rem !important; }

.csomester-dialog[hidden] { display: none; }
.csomester-dialog { position: fixed; z-index: 10060; inset: 0; display: grid; place-items: center; padding: 20px; background: rgba(26, 14, 8, .72); }
.csomester-dialog__panel { position: relative; width: min(520px, 100%); overflow: hidden; padding: 32px; border: 4px solid #8edfff; border-radius: 24px; background: var(--cs-cream); box-shadow: 0 26px 70px rgba(0, 0, 0, .42); text-align: center; animation: csomester-pop .35s cubic-bezier(.2, .9, .3, 1.25); }
@keyframes csomester-pop { from { opacity: 0; transform: scale(.78); } }
.csomester-dialog__icon { font-size: 3.8rem; }
.csomester-dialog h2 { margin: 5px 0 8px; color: var(--cs-brown-dark); font-size: 2rem; }
.csomester-dialog p { color: #67594f; }
.csomester-dialog .csomester-eyebrow { color: var(--cs-blue-dark); }
.csomester-stars { color: #e3a600; font-size: 2.7rem; letter-spacing: .09em; }
.csomester-dialog__actions { display: flex; justify-content: center; gap: 12px; margin-top: 18px; }
.csomester-next { background: var(--cs-copper); box-shadow: 0 4px 0 #6d3914; }
.csomester-confetti { position: absolute; top: -20px; width: 10px; height: 18px; animation: csomester-confetti 1.9s linear forwards; }
@keyframes csomester-confetti { to { transform: translate(var(--drift), 620px) rotate(760deg); opacity: .2; } }

.csomester-login,
.csomester-closed,
.csomester-empty { min-height: 560px; padding: 60px 24px; color: #fff; background: linear-gradient(rgba(54, 27, 14, .84), rgba(54, 27, 14, .92)), url("../images/workbench-grid.png") center / cover; text-align: center; }
.csomester-login > *,
.csomester-closed > * { max-width: 620px; margin-left: auto; margin-right: auto; }
.csomester-login h1,
.csomester-closed h1 { margin-top: 8px; font-size: clamp(2.2rem, 6vw, 4rem); }
.csomester-login__logo { width: 130px; height: 130px; object-fit: contain; filter: drop-shadow(0 10px 5px rgba(0, 0, 0, .35)); }
.csomester-closed__icon { font-size: 5rem; }
.csomester-login__form { margin-top: 24px; padding: 22px; border-radius: 18px; color: var(--cs-ink); background: rgba(255, 250, 240, .96); box-shadow: var(--cs-shadow); text-align: left; }
.csomester-login__form label { display: block; margin-bottom: 7px; font-weight: 900; }
.csomester-password-row { display: flex; gap: 9px; }
.csomester-password-row input { flex: 1; min-width: 0; min-height: 48px; padding: 10px 13px; border: 2px solid #b9dfea; border-radius: 11px; font-size: 1rem; }
.csomester-password-row button { padding: 10px 20px; border: 0; border-radius: 11px; color: #fff; background: var(--cs-blue-dark); font-weight: 900; cursor: pointer; }
.csomester-alert { margin-top: 20px; padding: 15px; border-radius: 13px; }
.csomester-alert--warning { color: #713f12; background: #fef3c7; }

.csomester-pipe-tool:focus-visible,
.csomester-check:focus-visible,
.csomester-reset:focus-visible,
.csomester-next:focus-visible,
.csomester-sound:focus-visible,
.csomester-logout:focus-visible,
.csomester-sidebar select:focus-visible,
.csomester-password-row input:focus-visible,
.csomester-password-row button:focus-visible { outline: 4px solid #ffe17a; outline-offset: 2px; }

@media (max-width: 1050px) {
    .csomester-layout { grid-template-columns: 1fr; }
    .csomester-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; border-right: 0; border-bottom: 1px solid #dfc7aa; }
    .csomester-sidebar > label,
    .csomester-sidebar > select,
    .csomester-level-meta,
    #csomester-level-description,
    .csomester-stats,
    .csomester-history-wrap,
    .csomester-sidebar > .csomester-reset,
    .csomester-sidebar > .csomester-clear-progress,
    .csomester-student-builder { grid-column: 1 / -1; }
    .csomester-stage { display: block; }
    .csomester-palette { margin: 16px 0 0; }
    .csomester-palette__heading { flex-direction: row; align-items: center; }
    .csomester-pipe-tools { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 620px) {
    .csomester-app { border-radius: 16px; }
    .csomester-header { align-items: flex-start; padding: 18px 15px; }
    .csomester-title-row > img { width: 50px; height: 50px; }
    .csomester-header h1 { font-size: 1.9rem; }
    .csomester-subtitle { display: none; }
    .csomester-stage { padding: 12px 8px 18px; }
    .csomester-board { border-width: 5px; border-radius: 11px; }
    .csomester-palette__heading { align-items: stretch; flex-direction: column; }
    .csomester-pipe-tools { grid-template-columns: repeat(2, 1fr); }
    .csomester-pipe-tool { grid-template-rows: 48px auto auto; }
    .csomester-pipe-tool img,
    .csomester-tool-emoji { width: 48px; height: 48px; }
    .csomester-key-hint { display: none; }
    .csomester-password-row,
    .csomester-dialog__actions { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
    .csomester-app *,
    .csomester-app *::before,
    .csomester-app *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}