/* --- Design tokens --- */
:root {
    --bg: #f4f1ec;
    --surface: #ffffff;
    --text: #2a2420;
    --text-muted: #6b635c;
    --accent: #e63946;
    --accent-hover: #c92f3b;
    --accent-soft: rgba(230, 57, 70, 0.12);
    --border: #e0d8cf;
    --shadow: 0 12px 40px rgba(42, 36, 32, 0.08);
    --radius: 14px;
    --machine-max: min(92vw, 520px);
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    /* Fallback until JS calibrates from the machine artwork */
    --globe-top: 10.1%;
    --globe-left: 50%;
    --globe-size: 32.1%;
    --chute-bottom: 6%;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: "Nunito", system-ui, sans-serif;
    line-height: 1.5;
}

/* --- Layout --- */
.app {
    max-width: 640px;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 3rem;
    text-align: center;
}

.app__header {
    margin-bottom: 1.75rem;
}

.app__title {
    margin: 0 0 0.35rem;
    font-size: clamp(1.5rem, 4.5vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}

/* --- Range controls --- */
.controls {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: center;
    gap: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    padding: 1rem 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.controls__field {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    min-width: 7rem;
}

.controls__label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.controls__input {
    width: 100%;
    min-width: 6.5rem;
    padding: 0.55rem 0.75rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    background: var(--bg);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.controls__input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.controls__divider {
    align-self: center;
    padding-bottom: 0.55rem;
    font-weight: 700;
    color: var(--text-muted);
}

.controls__error {
    margin: 0.35rem 0 1rem;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--accent);
}

.controls__error[hidden] {
    display: none;
}

/* --- Machine frame --- */
.machine {
    margin: 0.5rem 0 1.25rem;
}

.machine__frame {
    position: relative;
    width: var(--machine-max);
    margin: 0 auto;
}

.machine__art {
    display: block;
    width: 100%;
    height: auto;
    user-select: none;
    pointer-events: none;
}

.machine__globe {
    position: absolute;
    top: var(--globe-top);
    left: var(--globe-left);
    width: var(--globe-size);
    aspect-ratio: 1;
    transform: translateX(-50%);
    overflow: hidden;
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
}

.machine__globe.globe--jumbling {
    animation: globe-shake 0.28s ease-in-out infinite;
}

@keyframes globe-shake {
    0%, 100% { transform: translateX(-50%) rotate(0deg); }
    25% { transform: translateX(calc(-50% - 1px)) rotate(-0.4deg); }
    75% { transform: translateX(calc(-50% + 1px)) rotate(0.4deg); }
}

.machine__chute {
    position: absolute;
    left: 50%;
    bottom: var(--chute-bottom);
    width: 14%;
    aspect-ratio: 1;
    transform: translateX(-50%);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    pointer-events: none;
    z-index: 2;
}

/* --- Gumball slots (anchored inside circular globe) --- */
.gumball-slot {
    position: absolute;
    width: 19%;
    aspect-ratio: 1;
    transform: translate(-50%, -50%);
    will-change: transform;
    animation: idle-drift var(--float-duration, 5s) ease-in-out infinite;
    animation-delay: var(--float-delay, 0s);
}

.gumball-slot__img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0.92;
}

.gumball-slot--base {
    animation-name: idle-drift-base;
}

@keyframes idle-drift-base {
    0%, 100% {
        transform: translate(-50%, -50%);
    }
    50% {
        transform: translate(
            calc(-50% + var(--drift-x, 1px)),
            calc(-50% + var(--drift-y, 0px))
        );
    }
}

.globe--jumbling .gumball-slot {
    animation: jumble var(--jumble-duration, 0.32s) ease-in-out infinite;
    animation-delay: var(--jumble-delay, 0s);
}

@keyframes idle-drift {
    0%, 100% {
        transform: translate(-50%, -50%);
    }
    50% {
        transform: translate(
            calc(-50% + var(--drift-x, 2px)),
            calc(-50% + var(--drift-y, -3px))
        );
    }
}

@keyframes jumble {
    0%, 100% {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    25% {
        transform: translate(
            calc(-50% + var(--jx, 3%)),
            calc(-50% + var(--jy, -2%))
        ) rotate(10deg);
    }
    50% {
        transform: translate(
            calc(-50% + var(--jx2, -2%)),
            calc(-50% + var(--jy2, 3%))
        ) rotate(-8deg);
    }
    75% {
        transform: translate(
            calc(-50% + var(--jx3, 2%)),
            calc(-50% + var(--jy3, 2%))
        ) rotate(6deg);
    }
}

/* --- Result gumball (dispense + rest) --- */
.result-gumball {
    position: relative;
    width: clamp(48px, 18vw, 72px);
    aspect-ratio: 1;
    opacity: 0;
    transform: translateY(-120%) scale(0.4);
}

.result-gumball__img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.15));
}

.result-gumball__number {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(0.65rem, 2.8vw, 0.95rem);
    font-weight: 800;
    color: #fff;
    text-shadow:
        0 1px 2px rgba(0, 0, 0, 0.55),
        0 0 6px rgba(0, 0, 0, 0.25);
    line-height: 1;
    padding: 0 4px;
    word-break: break-all;
}

.result-gumball.is-dispensing {
    animation: dispense 0.9s cubic-bezier(0.34, 1.2, 0.64, 1) forwards;
}

.result-gumball.is-visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

@keyframes dispense {
    0% {
        opacity: 0;
        transform: translateY(-130%) scale(0.35);
    }
    40% {
        opacity: 1;
    }
    75% {
        transform: translateY(8%) scale(1.06);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.machine-sound {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    pointer-events: none;
}

/* --- Generate button --- */
.generate-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 12rem;
    padding: 0.85rem 2rem;
    border: none;
    border-radius: 999px;
    background: var(--accent);
    color: #fff;
    font-family: inherit;
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(230, 57, 70, 0.35);
    transition:
        background var(--transition),
        transform var(--transition),
        box-shadow var(--transition),
        opacity var(--transition);
}

.generate-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(230, 57, 70, 0.4);
}

.generate-btn:active:not(:disabled) {
    transform: translateY(0);
}

.generate-btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

.generate-btn:focus-visible {
    outline: 3px solid var(--accent-soft);
    outline-offset: 3px;
}

/* --- Responsive --- */
@media (max-width: 480px) {
    .app {
        padding: 1.25rem 1rem 2.5rem;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .controls__field {
        width: 100%;
        min-width: unset;
    }

    .controls__divider {
        padding-bottom: 0;
    }

    :root {
        --machine-max: min(96vw, 400px);
    }
}

@media (min-width: 768px) {
    :root {
        --machine-max: 560px;
    }

    .app {
        max-width: 720px;
        padding-top: 2.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .gumball-slot,
    .gumball-slot--base,
    .machine__globe.globe--jumbling {
        animation: none;
    }

    .result-gumball.is-dispensing {
        animation: none;
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}