/* ===== Design tokens — soft sky-candy ===== */
:root {
    --sky-soft: #EAF7FF;
    --sky-mid: #B8E4FF;
    --mint-soft: #C8F0C0;
    --ui-blue: #5EB7F5;
    --accent-blue: #3FA0E8;
    --text-deep: #2B5F8A;
    --text-soft: #4A7AA8;
    --border-sky: #A5D8FF;
    --success-mint: #4DB6A0;
    --white: #FFFFFF;
    --btn-light: #9AD6FF;
    --btn-mid: #5EB7F5;
    --btn-deep: #3FA0E8;
    --btn-depth-top: #4A9AD8;
    --btn-depth-bot: #2F7FBE;
    --icon-grad-top: #7EC8F8;
    --icon-grad-bot: #5EB7F5;
    --shadow-blue: #70B0E0;
    --glow-blue: #90C8F0;

    --color-bg: #EAF7FF;
    --color-text: #2B5F8A;
    --font-family: 'Nunito', sans-serif;
    --transition-fast: 0.1s;
    --board-radius: 36px;
    --card-radius: 24px;
    --top-bar-height: 46px;
    --screen-padding: 28px;
    --ui-inset: 12px;
    --game-gap: 16px;
}

body {
    margin: 0;
    padding: max(var(--screen-padding), env(safe-area-inset-top)) max(var(--screen-padding), env(safe-area-inset-right)) max(var(--screen-padding), env(safe-area-inset-bottom)) max(var(--screen-padding), env(safe-area-inset-left));
    box-sizing: border-box;
    background-color: var(--color-bg);
    background-image:
        linear-gradient(180deg, rgba(184, 228, 255, 0.35) 0%, rgba(234, 247, 255, 0.2) 45%, rgba(200, 240, 192, 0.25) 100%),
        url('../img/bg.png');
    background-repeat: no-repeat, no-repeat;
    background-position: center center, center center;
    background-size: cover, cover;
    background-attachment: fixed, fixed;
    touch-action: none;
    font-family: var(--font-family);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    min-height: 100dvh;
    min-width: 100vw;
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    color: var(--color-text);
}

body.in-game {
    gap: var(--game-gap);
}

#top-controls {
    position: fixed;
    top: max(var(--ui-inset), env(safe-area-inset-top));
    left: max(var(--ui-inset), env(safe-area-inset-left));
    z-index: 15;
    pointer-events: none;
}

.btn-icon {
    pointer-events: auto;
}

.btn-icon-svg {
    display: block;
}

body:not(.in-game) #top-controls {
    opacity: 0;
    pointer-events: none;
}

/* Start screen: hide game elements */
body.start-screen #goal-container,
body.start-screen #goal-toast,
body.start-screen #gameCanvas {
    display: none;
}

#start-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    z-index: 10;
    background: transparent;
}

body:not(.start-screen) #start-screen {
    display: none;
}

/* ===== Game over: full-viewport dim over everything ===== */
#game-over-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    z-index: 30;
    background: rgba(0, 0, 0, 0.5);
}

#game-over-screen[hidden] {
    display: none;
}

/* ===== Goal HUD: soft white sky card ===== */
#goal-container,
.goal-container {
    flex-shrink: 0;
    width: max-content;
    max-width: min(var(--board-width, 400px), 100%);
    box-sizing: border-box;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 10px 18px 10px 16px;
    background: linear-gradient(165deg, #FFFFFF 0%, #EAF7FF 55%, #DFF1FF 100%);
    border: 2.5px solid var(--goal-glow, var(--border-sky));
    border-radius: 999px;
    box-shadow:
        0 8px 24px rgba(112, 176, 224, 0.32),
        0 0 0 3px color-mix(in srgb, var(--goal-glow, #A5D8FF) 28%, transparent),
        0 2px 0 rgba(165, 216, 255, 0.55);
    position: relative;
    transition: box-shadow 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.goal-container.goal-pulse {
    animation: goal-pulse 0.55s ease-out;
}

@keyframes goal-pulse {
    0% { transform: scale(1); }
    40% { transform: scale(1.08); }
    100% { transform: scale(1); }
}

.goal-label {
    flex-shrink: 0;
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.goal-preview-canvas {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: block;
    border-radius: 50%;
    background: transparent;
}

.goal-progress {
    flex-shrink: 0;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--accent-blue);
    min-width: 2.6em;
    text-align: center;
}

.goal-toast {
    position: fixed;
    top: max(calc(var(--ui-inset) + var(--top-bar-height) + 8px), calc(env(safe-area-inset-top) + 56px));
    left: 50%;
    transform: translateX(-50%) translateY(-6px);
    z-index: 20;
    padding: 10px 20px;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 800;
    color: #FFFFFF;
    background: linear-gradient(180deg, var(--btn-light) 0%, var(--btn-mid) 45%, var(--btn-deep) 100%);
    border: 2.5px solid #FFFFFF;
    box-shadow: 0 6px 18px rgba(112, 176, 224, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.goal-toast.is-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===== Canvas = open-top cup ===== */
#gameCanvas.game-canvas {
    display: block;
    width: var(--board-width, 400px);
    height: var(--board-height, 600px);
    border: none;
    border-radius: 0 0 var(--board-radius) var(--board-radius);
    box-sizing: content-box;
    overflow: visible;
    background: transparent;
    box-shadow: none;
    cursor: none;
}

.overlay-card {
    width: max-content;
    max-width: min(340px, calc(100% - 32px));
    background: linear-gradient(165deg, #FFFFFF 0%, #EAF7FF 50%, #DFF1FF 100%);
    border: 3px solid var(--border-sky);
    border-radius: var(--card-radius);
    padding: 2rem 2.25rem;
    text-align: center;
    box-shadow:
        0 12px 36px rgba(144, 200, 240, 0.55),
        0 4px 0 rgba(165, 216, 255, 0.7);
}

.overlay-title {
    font-family: 'Nunito', sans-serif;
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--accent-blue);
    text-shadow:
        0 2px 0 rgba(255, 255, 255, 0.9),
        0 4px 12px rgba(112, 176, 224, 0.35);
    margin: 0 0 0.5rem;
    line-height: 1.1;
    letter-spacing: 0.02em;
}

.overlay-subtitle {
    font-family: 'Nunito', sans-serif;
    font-weight: 600;
    color: var(--text-soft);
    margin: 0 0 1.5rem;
    line-height: 1.5;
    font-size: 1rem;
}

.overlay-card .btn {
    margin-top: 0;
}

/* ===== Buttons ===== */
.btn {
    font-family: 'Nunito', sans-serif;
    background: linear-gradient(180deg, var(--btn-light) 0%, var(--btn-mid) 45%, var(--btn-deep) 100%);
    color: #FFFFFF;
    border: 3px solid #FFFFFF;
    padding: 14px 36px;
    font-size: 1.15rem;
    font-weight: 800;
    border-radius: 999px;
    cursor: pointer;
    box-shadow:
        0 6px 0 var(--btn-depth-bot),
        0 10px 22px rgba(112, 176, 224, 0.45);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    margin-top: 10px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow:
        0 8px 0 var(--btn-depth-bot),
        0 14px 28px rgba(112, 176, 224, 0.5);
}

.btn:active {
    transform: translateY(3px) scale(0.98);
    box-shadow:
        0 3px 0 var(--btn-depth-bot),
        0 6px 16px rgba(112, 176, 224, 0.35);
}

/* Circular back / sound style */
.btn.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    box-sizing: border-box;
    width: var(--top-bar-height);
    height: var(--top-bar-height);
    min-width: var(--top-bar-height);
    min-height: var(--top-bar-height);
    max-width: var(--top-bar-height);
    max-height: var(--top-bar-height);
    border-radius: 50%;
    margin-top: 0;
    background: linear-gradient(180deg, var(--icon-grad-top) 0%, var(--icon-grad-bot) 100%);
    border: 3px solid #FFFFFF;
    box-shadow:
        0 4px 0 var(--btn-depth-top),
        0 8px 18px rgba(112, 176, 224, 0.4);
}

.btn.btn-icon .btn-icon-svg {
    width: 22px;
    height: 22px;
    display: block;
    margin: 0 auto;
}

/* ===== Mobile-only: move and drop controls ===== */
.mobile-controls {
    display: none;
    flex-shrink: 0;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 10px 0;
    width: 100%;
    max-width: var(--board-width, 400px);
    box-sizing: border-box;
}

body.in-game .mobile-controls {
    display: flex;
}

.mobile-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 3px solid #FFFFFF;
    cursor: pointer;
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    color: #FFFFFF;
    background: linear-gradient(180deg, var(--btn-light) 0%, var(--btn-mid) 45%, var(--btn-deep) 100%);
    box-shadow:
        0 5px 0 var(--btn-depth-bot),
        0 8px 18px rgba(112, 176, 224, 0.4);
    border-radius: 16px;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.mobile-btn:active {
    transform: scale(0.96) translateY(2px);
    box-shadow:
        0 2px 0 var(--btn-depth-bot),
        0 4px 12px rgba(112, 176, 224, 0.3);
}

.mobile-btn-left,
.mobile-btn-right {
    width: 52px;
    height: 52px;
    min-width: 52px;
    min-height: 52px;
    border-radius: 50%;
}

.mobile-btn-left svg,
.mobile-btn-right svg {
    width: 28px;
    height: 28px;
    display: block;
}

.mobile-btn-drop {
    padding: 14px 32px;
    font-size: 1.1rem;
    min-height: 52px;
    border-radius: 999px;
}

/* Hide mobile controls on desktop (show only on touch/narrow viewports) */
@media (min-width: 769px) {
    .mobile-controls {
        display: none !important;
    }
}

/* ===== Responsive: design tokens overrides per breakpoint ===== */
@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        --screen-padding: 20px;
        --top-bar-height: 42px;
        --ui-inset: 10px;
        --game-gap: 14px;
        --board-radius: 32px;
        --card-radius: 22px;
    }
    .goal-container {
        padding: 8px 14px 8px 12px;
        gap: 10px;
    }
    .goal-label {
        font-size: 0.65rem;
    }
    .goal-preview-canvas {
        width: 32px;
        height: 32px;
    }
    .goal-progress {
        font-size: 1.2rem;
    }
    .btn {
        padding: 12px 30px;
        font-size: 1.05rem;
    }
    .btn.btn-icon .btn-icon-svg {
        width: 20px;
        height: 20px;
    }
    .overlay-title {
        font-size: 2.25rem;
    }
    .overlay-subtitle {
        font-size: 0.95rem;
    }
    .overlay-card {
        padding: 1.75rem 2rem;
    }
}

@media (min-width: 641px) and (max-width: 768px) {
    :root {
        --screen-padding: 16px;
        --top-bar-height: 40px;
        --ui-inset: 8px;
        --game-gap: 12px;
        --board-radius: 30px;
        --card-radius: 22px;
    }
    body {
        padding: var(--screen-padding);
    }
    .goal-container {
        padding: 8px 12px 8px 12px;
        gap: 8px;
    }
    .goal-label {
        font-size: 0.6rem;
    }
    .goal-preview-canvas {
        width: 30px;
        height: 30px;
    }
    .goal-progress {
        font-size: 1.15rem;
    }
    .btn {
        padding: 12px 28px;
        font-size: 1rem;
    }
    .btn.btn-icon .btn-icon-svg {
        width: 18px;
        height: 18px;
    }
    .overlay-card {
        max-width: min(300px, calc(100% - 24px));
        padding: 1.5rem 1.75rem;
    }
    .overlay-title {
        font-size: 2rem;
    }
    .overlay-subtitle {
        font-size: 0.9rem;
        margin-bottom: 1.25rem;
    }
}

@media (max-width: 640px) {
    :root {
        --screen-padding: 12px;
        --top-bar-height: 38px;
        --ui-inset: 8px;
        --game-gap: 10px;
        --board-radius: 28px;
        --card-radius: 20px;
    }
    body {
        padding: var(--screen-padding);
    }
    #start-screen {
        padding: 16px;
    }
    .goal-container {
        padding: 7px 12px 7px 10px;
        gap: 8px;
    }
    .goal-label {
        font-size: 0.55rem;
        letter-spacing: 0.1em;
    }
    .goal-preview-canvas {
        width: 28px;
        height: 28px;
    }
    .goal-progress {
        font-size: 1.1rem;
    }
    .btn {
        padding: 10px 24px;
        font-size: 0.95rem;
    }
    .btn.btn-icon .btn-icon-svg {
        width: 18px;
        height: 18px;
    }
    .overlay-card {
        max-width: min(280px, calc(100% - 24px));
        padding: 1.25rem 1.5rem;
    }
    .overlay-title {
        font-size: 1.75rem;
    }
    .overlay-subtitle {
        font-size: 0.85rem;
        margin-bottom: 1rem;
    }
}

@media (max-width: 480px) {
    :root {
        --screen-padding: 8px;
        --top-bar-height: 34px;
        --ui-inset: 6px;
        --game-gap: 8px;
        --board-radius: 24px;
        --card-radius: 18px;
    }
    body {
        padding: var(--screen-padding);
    }
    #start-screen {
        padding: 12px;
    }
    .goal-container {
        padding: 6px 10px 6px 8px;
        gap: 6px;
    }
    .goal-label {
        font-size: 0.5rem;
        letter-spacing: 0.08em;
    }
    .goal-preview-canvas {
        width: 24px;
        height: 24px;
    }
    .goal-progress {
        font-size: 1rem;
    }
    .btn {
        padding: 8px 20px;
        font-size: 0.9rem;
    }
    .btn.btn-icon .btn-icon-svg {
        width: 16px;
        height: 16px;
    }
    .overlay-card {
        max-width: min(260px, calc(100% - 16px));
        padding: 1rem 1.25rem;
    }
    .overlay-title {
        font-size: 1.5rem;
    }
    .overlay-subtitle {
        font-size: 0.8rem;
        margin-bottom: 0.75rem;
    }
}

@media (orientation: landscape) and (max-height: 500px) {
    :root {
        --screen-padding: 6px;
        --top-bar-height: 32px;
        --ui-inset: 4px;
        --game-gap: 6px;
        --board-radius: 20px;
        --card-radius: 16px;
    }
    body {
        padding: var(--screen-padding);
    }
    body.in-game {
        gap: var(--game-gap);
    }
    #start-screen {
        padding: 8px;
    }
    .goal-container {
        padding: 4px 8px 4px 6px;
        gap: 4px;
        max-width: 100%;
        min-width: 0;
        width: max-content;
        box-sizing: border-box;
    }
    .goal-label {
        font-size: 0.45rem;
        letter-spacing: 0.06em;
    }
    .goal-preview-canvas {
        width: 20px;
        height: 20px;
        min-width: 20px;
    }
    .goal-progress {
        font-size: 0.9rem;
    }
    .btn {
        padding: 6px 16px;
        font-size: 0.85rem;
    }
    .btn.btn-icon .btn-icon-svg {
        width: 14px;
        height: 14px;
    }
    .overlay-card {
        max-width: min(240px, calc(100% - 16px));
        padding: 0.75rem 1rem;
    }
    .overlay-title {
        font-size: 1.35rem;
    }
    .overlay-subtitle {
        font-size: 0.75rem;
        margin-bottom: 0.5rem;
    }
}