/* Neandertool - Retro Filter Design Theme */
@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

:root {
    /* Neandertool Palette */
    --bg-dark: #0a1628;
    /* deep-blue */
    --bg-panel: #0d2035;
    --font-white: #ffffff;
    /* snow-white */
    --font-gray: #a0d8ef;
    /* ice-blue */
    --font-dark: #d4f1f9;
    /* ice-light */

    --primary: #8d6e63;
    /* mammoth-brown */
    --primary-dark: #5d4037;
    /* mammoth-dark */
    --accent-cyan: #00bcd4;
    /* frost-cyan */
    --accent-purple: #7c4dff;
    /* frozen-purple */
    --accent-orange: #ff9800;
    /* warning-orange */
    --accent-red: #f44336;
    /* danger-red */
    --accent-green: #4caf50;
    /* success-green */

    --border-dark: #5d4037;
    /* mammoth-dark */

    --pixel-font: 'Press Start 2P', 'Courier New', monospace;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-dark);
    background-image: url('../assets/background.png');
    background-size: cover;
    background-attachment: fixed;
    color: var(--font-white);
    font-family: var(--pixel-font);
    font-size: 10px;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    image-rendering: pixelated;
}

/* ── Main Container ─────────────────────────────────────────── */
/* Fit-to-viewport: --ui-zoom is computed in js/main.js (fitToViewport) so the
   whole UI scales to the available window; the container fills it and the
   panels stretch to the remaining height. */
:root {
    --ui-zoom: 0.54;
    --ui-gap: 12px;
}

#game-container {
    width: calc((100vw - 2 * var(--ui-gap)) / var(--ui-zoom));
    height: calc((100vh - 2 * var(--ui-gap)) / var(--ui-zoom));
    max-width: none;
    background: var(--bg-dark);
    border: 4px solid var(--primary);
    margin: calc(var(--ui-gap) / var(--ui-zoom));
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    position: relative;
    /* Hard pixel shadows */
    box-shadow: 10px 10px 0px var(--border-dark);
    zoom: var(--ui-zoom);
}

/* Top decorative pixel line */
#game-container::before {
    content: '';
    position: absolute;
    top: -4px;
    right: -4px;
    bottom: -4px;
    left: -4px;
    border: 2px solid var(--accent-cyan);
    pointer-events: none;
    z-index: 100;
}

/* ── Header ─────────────────────────────────────────────────── */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 4px solid var(--primary);
    padding-bottom: 15px;
    margin-bottom: 20px;
}

#header-right {
    display: flex;
    align-items: center;
    gap: 18px;
}

h1 {
    font-size: 28px;
    color: var(--font-white);
    text-shadow: 4px 4px 0px var(--primary-dark);
    margin: 0;
    letter-spacing: 2px;
}

h2 {
    font-size: 12px;
    color: var(--font-dark);
    margin: 0 0 12px 0;
    padding-bottom: 8px;
    border-bottom: 2px dashed var(--font-dark);
    letter-spacing: 1px;
}

/* ── Mode Menu (hamburger) ───────────────────────────────────── */
#mode-menu {
    position: relative;
}

#btn-menu {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

#btn-menu:hover,
#btn-menu[aria-expanded="true"] {
    background: var(--accent-cyan);
    color: var(--bg-dark);
    border-color: var(--accent-cyan);
}

#mode-selector {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    z-index: 500;
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 220px;
    padding: 8px;
    background: var(--bg-panel);
    border: 4px solid var(--primary);
    box-shadow: 6px 6px 0px var(--border-dark);
}

#mode-selector button {
    text-align: left;
    width: 100%;
}

/* ── Sensitivity Control ─────────────────────────────────────── */
#sensitivity-control {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 8px;
    color: var(--font-white);
    background: var(--bg-panel);
    border: 2px solid var(--primary);
    padding: 6px 10px;
}

#sensitivity-control label {
    white-space: nowrap;
    font-size: 8px;
    color: var(--font-gray);
}

#scroll-sensitivity {
    width: 120px;
    height: 12px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-dark);
    border: 2px solid var(--primary);
}

#scroll-sensitivity::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 20px;
    background: var(--accent-cyan);
    cursor: pointer;
}

#sensitivity-value {
    color: var(--accent-cyan);
    font-size: 8px;
    min-width: 28px;
    text-align: right;
}

/* ── Layout ──────────────────────────────────────────────────── */
#main-interface {
    display: flex;
    gap: 20px;
    flex: 1;
    min-height: 0;
    width: 100%;
}

#plot-area {
    flex: 1;
    /* Absorbs all remaining width */
    background: #000510;
    border: 4px solid var(--primary);
    position: relative;
    min-height: 0;
    overflow: hidden;
    box-shadow: inset 4px 4px 0px var(--bg-panel);
}

#frequency-response {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

#pzmap-area {
    flex: 0 0 320px;
    /* Expanded to yield a wider canvas for the circles */
    background: #000205;
    /* slightly darker to differentiate */
    border: 4px solid var(--primary);
    position: relative;
    min-height: 0;
    overflow: hidden;
    box-shadow: inset 4px 4px 0px var(--bg-panel);
}

#pzmap-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

#controls-area {
    flex: 0 0 550px;
    /* Fixed width of 550px */
    display: flex;
    flex-direction: column;
    gap: 15px;
    min-height: 0;
}

#controls-area * {
    box-sizing: border-box;
}

#controls-area.interaction-locked,
#controls-layout.interaction-locked {
    pointer-events: none !important;
    filter: grayscale(40%);
    opacity: 0.8;
}

/* ── Level Navigation (Prev / Keep Exploring / Next) ─────────── */
#level-nav {
    display: flex;
    gap: 10px;
    height: 55px;
    flex: none;
}

#level-nav button {
    flex: 1;
    padding: 0 8px;
    font-size: 11px;
    border-color: var(--accent-purple);
    color: var(--accent-purple);
}

#level-nav button:hover:not(:disabled) {
    background: var(--accent-purple);
    color: var(--font-white);
}

#level-nav button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
    background: var(--bg-panel);
    color: var(--accent-purple);
}

#btn-keep-exploring {
    flex: 1.4 !important;
}

/* Intro: the middle button becomes a flashy BEGIN */
#level-nav #btn-keep-exploring.begin {
    font-size: 14px;
    background: var(--accent-orange);
    border-color: var(--accent-orange);
    color: var(--bg-dark);
    animation: begin-pulse 1.4s ease-in-out infinite;
}

#level-nav #btn-keep-exploring.begin:hover {
    background: var(--font-white);
    border-color: var(--font-white);
    color: var(--bg-dark);
}

@keyframes begin-pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(255, 152, 0, 0);
    }

    50% {
        background: #ffad33;
        border-color: #ffad33;
        box-shadow: 0 0 10px 3px rgba(255, 152, 0, 0.55);
    }
}

/* Next becomes the obvious call to action once the level is passed */
#btn-next-level.ready {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: var(--bg-dark);
}

#btn-next-level.ready:hover {
    background: var(--font-white);
    border-color: var(--font-white);
    color: var(--bg-dark);
}

#btn-next-level.ready.pulse {
    animation: next-pulse 0.8s ease-in-out infinite;
}

@keyframes next-pulse {
    0%, 100% {
        background: var(--accent-green);
        border-color: var(--accent-green);
        box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.9);
    }

    50% {
        background: #b2ff59;
        border-color: #b2ff59;
        box-shadow: 0 0 18px 6px rgba(178, 255, 89, 0.7);
    }
}

#game-container:not(.challenge-mode) #level-nav {
    display: none;
}

/* ── Challenge HUD ───────────────────────────────────────────── */
#challenge-hud {
    background: var(--bg-panel);
    border: 4px solid var(--accent-orange);
    padding: 12px;
    display: flex;
    justify-content: space-between;
    height: 55px;
    box-sizing: border-box;
    align-items: center;
}

#challenge-hud .hud-item {
    text-align: center;
    color: var(--font-gray);
    letter-spacing: 1px;
}

#challenge-hud span {
    color: var(--font-white);
    font-size: 14px;
}

/* Timer */
#timer {
    font-size: 18px;
    font-weight: bold;
    color: var(--accent-green);
}

#timer.timer-yellow {
    color: var(--font-white);
}

#timer.timer-red {
    color: var(--accent-red);
    animation: blink-red 0.4s step-end infinite alternate;
}

@keyframes blink-red {
    from {
        color: var(--accent-red);
    }

    to {
        color: var(--border-dark);
    }
}

.hidden {
    display: none !important;
}

/* ── Buttons ─────────────────────────────────────────────────── */
button {
    background: var(--bg-panel);
    color: var(--font-white);
    border: 2px solid var(--primary);
    padding: 10px 12px;
    font-family: var(--pixel-font);
    font-size: 10px;
    cursor: pointer;
    text-transform: uppercase;
    box-shadow: 2px 2px 0px var(--border-dark);
}

button:hover {
    background: var(--primary);
    color: var(--font-white);
    border-color: var(--primary);
    box-shadow: 2px 2px 0px var(--border-dark);
    transform: translate(-1px, -1px);
}

button:active {
    transform: translate(2px, 2px);
    box-shadow: 0px 0px 0px transparent;
}

button.active {
    background: var(--accent-cyan);
    color: var(--bg-dark);
    border-color: var(--accent-cyan);
    box-shadow: 2px 2px 0px var(--primary-dark);
}

button.active:hover {
    background: var(--font-white);
    color: var(--bg-dark);
}

/* ── Filter Controls ─────────────────────────────────────────── */
#controls-layout {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: var(--bg-panel);
    border: 4px solid var(--primary);
    padding: 10px;
    overflow-y: auto;
}

#controls-layout h2 {
    margin-bottom: 4px;
}

#stages-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    min-width: 0;
}

#stages-list:empty {
    display: none;
}

.stage-card {
    background: var(--bg-dark);
    border: 2px solid var(--primary);
    padding: 6px 10px 10px;
    -webkit-user-select: none;
    user-select: none;
    flex: none;
    max-width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stage-card:hover {
    border-color: var(--accent-cyan);
}

.stage-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 4px;
}

.stage-header span {
    color: var(--font-dark);
    font-size: 10px;
}

/* Each parameter takes half the card width: value centered over its slider */
.stage-params {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: end;
}

.param-control {
    min-width: 0;
}

.stage-params .param-top-row {
    display: grid;
    grid-template-columns: 1fr auto;
    row-gap: 6px;
    column-gap: 8px;
}

.stage-params .param-top-row label {
    grid-column: 1 / -1;
    text-align: center;
}

.stage-params .param-top-row .param-slider {
    grid-column: 1;
}

.challenge-mode .stage-params .param-top-row .param-slider {
    grid-column: 1 / -1;
}

.remove-btn {
    background: var(--bg-dark);
    border: 2px solid var(--accent-red);
    color: var(--accent-red);
    width: 24px;
    height: 24px;
    padding: 0;
    font-size: 14px;
    line-height: 1;
    box-shadow: none;
}

.remove-btn:hover {
    background: var(--accent-red);
    color: var(--font-white);
    transform: translate(0, 0);
    box-shadow: none;
}

/* Parameter row: label + scrollable value + slider (+ play in sandbox) */
.param-top-row,
.param-row {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
}

.param-top-row label,
.param-row label {
    flex-shrink: 0;
    white-space: nowrap;
    color: var(--font-gray);
    font-size: 8px;
    letter-spacing: 1px;
}

.param-value {
    color: var(--accent-cyan);
    font-size: 12px;
    cursor: ns-resize;
    display: inline-block;
    border-bottom: 2px solid var(--accent-cyan);
    padding: 2px 6px 2px 4px;
    width: 65px;
    text-align: right;
}

/* The whole parameter zone is scrollable: highlight its value while hovered */
.param-control:hover .param-value,
#global-gain-card .param-row:not(#sandbox-row):hover .param-value,
.param-value:hover {
    background: var(--accent-cyan);
    color: var(--bg-dark);
}

.param-unit {
    display: inline-block;
    margin-left: 5px;
    min-width: 24px;
}

/* Sliders */
.param-slider {
    width: 100%;
    flex: 1;
    min-width: 40px;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-dark);
    border: 2px solid var(--primary);
}

.param-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 16px;
    background: var(--accent-cyan);
    cursor: pointer;
}

.play-btn {
    padding: 0;
    font-size: 10px;
    width: 20px;
    height: 20px;
    line-height: 20px;
    flex-shrink: 0;
    border-radius: 4px;
}

.challenge-mode .play-btn {
    display: none;
}

/* Global gain card */
#global-gain-card {
    border-color: var(--accent-cyan);
    padding: 10px;
}

#sandbox-row {
    justify-content: space-between;
}

#sandbox-row button {
    white-space: nowrap;
    padding: 8px 8px;
    font-size: 8px;
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

#sandbox-row button:hover {
    background: var(--accent-cyan);
    color: var(--bg-dark);
}

.challenge-mode #sandbox-row {
    display: none;
}

/* Add-stage buttons (sit right under the last stage) */
.add-buttons {
    display: flex;
    flex-direction: row;
    gap: 10px;
    flex: none;
}

.add-buttons button {
    flex: 1;
    font-size: 9px;
    padding: 12px 6px;
    border: 2px dashed var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: none;
}

.add-buttons button:hover {
    background: var(--accent-cyan);
    color: var(--bg-dark);
}

/* ── Bottom tools (sensitivity + best solution) ──────────────── */
#bottom-tools {
    display: flex;
    gap: 10px;
    flex: none;
}

#bottom-tools #sensitivity-control {
    flex: 1;
    justify-content: space-between;
}

#bottom-tools #scroll-sensitivity {
    flex: 1;
    width: auto;
}

#best-solution {
    font-size: 9px;
    padding: 8px 10px;
    border-color: var(--accent-purple);
    color: var(--accent-purple);
}

#best-solution:hover {
    background: var(--accent-purple);
    color: var(--font-white);
}

#best-solution.active {
    background: var(--accent-purple);
    color: var(--font-white);
    border-color: var(--accent-purple);
}

#game-container:not(.challenge-mode) #best-solution {
    display: none;
}

/* ── PZ map drag ─────────────────────────────────────────────── */
#pzmap-canvas.pole-hover {
    cursor: grab;
}

#pzmap-canvas.pole-drag {
    cursor: grabbing;
}

/* ── Magnitude curve drag ────────────────────────────────────── */
#frequency-response.curve-hover {
    cursor: grab;
}

#frequency-response.curve-drag {
    cursor: grabbing;
}

/* ── Challenge Popups ────────────────────────────────────────── */
#popup-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 22, 40, 0.85);
    /* Deep translucent blue */
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

#popup-overlay.hidden {
    display: none !important;
}

.popup-box {
    background: var(--bg-panel);
    border: 4px solid var(--primary);
    padding: 30px;
    text-align: center;
    box-shadow: 10px 10px 0px var(--border-dark);
    max-width: 80%;
}

.popup-box.hidden {
    display: none !important;
}

/* "See Best Solution" read-only state */
#popup-overlay.viewing-best {
    background: transparent;
    backdrop-filter: none;
    pointer-events: none;
    align-items: flex-end;
    justify-content: flex-end;
    padding: 20px;
}

#popup-overlay.viewing-best .popup-box {
    pointer-events: auto;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
}

#popup-overlay.viewing-best .popup-title,
#popup-overlay.viewing-best .popup-message,
#popup-overlay.viewing-best #btn-popup-best {
    display: none;
}

.popup-title {
    font-size: 24px;
    margin-bottom: 20px;
    text-shadow: 3px 3px 0px var(--border-dark);
}

#victory-popup .popup-title {
    color: var(--accent-green);
}

#gameover-popup .popup-title {
    color: var(--accent-red);
}

.popup-message {
    color: var(--font-white);
    font-size: 12px;
    margin-bottom: 20px;
}

.popup-message-start {
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 30px;
    color: var(--accent-cyan);
}

.popup-countdown {
    font-size: 48px;
    color: var(--accent-cyan);
    margin-top: 10px;
    animation: ping 1s ease-in-out infinite;
}

@keyframes ping {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
    }
}

.popup-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 25px;
}

.popup-buttons button {
    padding: 15px 20px;
}

#btn-popup-best {
    border-color: var(--accent-purple);
    color: var(--accent-purple);
}

#btn-popup-best:hover {
    background: var(--accent-purple);
    color: var(--font-white);
}

#btn-popup-restart {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

#btn-popup-restart:hover {
    background: var(--accent-cyan);
    color: var(--bg-dark);
}

/* ── Footer ──────────────────────────────────────────────────── */
footer {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 4px solid var(--primary);
}

#message-area {
    text-align: center;
    color: var(--font-white);
    font-size: 12px;
    min-height: 20px;
}

#credits {
    text-align: center;
    color: var(--primary);
    font-size: 8px;
    margin-top: 10px;
}

/* ── Scrollbar ───────────────────────────────────────────────── */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
    border-left: 2px solid var(--primary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-cyan);
}

/* ── Leaderboard Overlay ─────────────────────────────────────── */
#game-container.leaderboard-mode #plot-area,
#game-container.leaderboard-mode #pzmap-area,
#game-container.leaderboard-mode #controls-area {
    display: none;
}

#leaderboard-area {
    flex: 1;
    display: none;
    /* hidden by default */
    flex-direction: column;
    align-items: center;
    background: var(--bg-panel);
    border: 4px solid var(--accent-orange);
    padding: 30px;
    min-height: 0;
    overflow-y: auto;
}

#game-container.leaderboard-mode #leaderboard-area {
    display: flex;
}

.leaderboard-title {
    font-size: 32px;
    color: var(--accent-orange);
    margin-bottom: 20px;
    text-shadow: 4px 4px 0px var(--border-dark);
}

#leaderboard-table {
    width: 80%;
    max-width: 800px;
    border-collapse: collapse;
    margin-bottom: 30px;
    font-family: var(--pixel-font);
}

#leaderboard-table th,
#leaderboard-table td {
    border: 4px solid var(--primary);
    padding: 12px 15px;
    text-align: center;
    color: var(--font-white);
}

#leaderboard-table th {
    background: var(--primary);
    color: var(--bg-dark);
    font-size: 18px;
}

#leaderboard-table tbody tr:hover {
    background: rgba(0, 188, 212, 0.2);
}

/* Trophy colors for top 3 */
#leaderboard-table tbody tr:nth-child(1) td {
    color: #FFD700;
    font-weight: bold;
}

/* Gold */
#leaderboard-table tbody tr:nth-child(2) td {
    color: #C0C0C0;
}

/* Silver */
#leaderboard-table tbody tr:nth-child(3) td {
    color: #CD7F32;
}

/* Bronze */

#leaderboard-manual-entry {
    background: #000510;
    border: 4px solid var(--accent-cyan);
    padding: 15px;
    width: 80%;
    max-width: 800px;
}

#leaderboard-manual-entry h3 {
    color: var(--accent-cyan);
    margin-top: 0;
    margin-bottom: 15px;
    text-align: center;
}

.manual-input-group {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.manual-input-group input {
    background: var(--bg-dark);
    border: 2px solid var(--primary);
    color: var(--font-white);
    padding: 8px;
    font-family: monospace;
}

/* ── Game Over High Score Entry ─────────────────────────────── */
#high-score-entry {
    margin: 20px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.new-record-text {
    color: var(--accent-orange);
    animation: blink-orange 0.5s step-end infinite alternate;
    font-size: 14px;
    margin: 0;
}

@keyframes blink-orange {
    from {
        color: var(--accent-orange);
    }

    to {
        color: transparent;
    }
}

#high-score-name {
    background: #000;
    border: 4px solid var(--accent-cyan);
    color: var(--accent-cyan);
    padding: 10px;
    font-size: 18px;
    text-align: center;
    font-family: 'Press Start 2P', monospace;
    text-transform: uppercase;
    width: 200px;
}

#btn-submit-score {
    border-color: var(--accent-orange);
    color: var(--accent-orange);
    padding: 10px 20px;
}

#btn-submit-score:hover {
    background: var(--accent-orange);
    color: var(--bg-dark);
}

/* ── Footer ─────────────────────────────────────────────────── */
footer {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 15px;
    padding: 10px 0;
}

#footer-logo {
    position: absolute;
    left: 20px;
    /* Indent for tidiness */
    height: 50px;
    /* Clean size relative to footer text */
    image-rendering: auto;
    top: 50%;
    transform: translateY(-50%);
    /* Align perfectly to technical vertical center */
}

#footer-center {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-top: 4px;
    /* Slight visual nudge down to match logo centering perfectly */
}