/* ── Design Tokens ─────────────────────────────────── */
:root {
    --color-bg: #1a1a2e;
    --color-machine: #16213e;
    --color-machine-inner: #0f3460;
    --color-accent: #e94560;
    --color-accent-glow: rgba(233, 69, 96, 0.4);
    --color-text: #f1f1f1;
    --color-text-muted: #a0a0b8;
    --color-display: #0a0a1a;
    --color-display-text: #39d98a;
    --color-dispense-bg: #0d1b36;
    --color-card-hover: rgba(255, 255, 255, 0.08);
    --color-card-active: rgba(233, 69, 96, 0.2);
    --color-success: #39d98a;

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-card: 0 4px 15px rgba(0, 0, 0, 0.3);
    --shadow-machine: 0 20px 60px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--color-accent-glow);

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-display: 'Segoe UI', system-ui, -apple-system, sans-serif;

    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ── Reset & Base ─────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    overflow-x: hidden;
}

/* ── Machine Container ────────────────────────────── */
.machine {
    background: var(--color-machine);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-machine);
    max-width: 600px;
    width: 100%;
    padding: var(--spacing-xl);
    position: relative;
    border: 2px solid rgba(255, 255, 255, 0.05);
}

/* ── Header ───────────────────────────────────────── */
.machine__header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.machine__title {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 5vw, 2.2rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-accent), #ff6b8a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.machine__subtitle {
    color: var(--color-text-muted);
    font-size: clamp(0.85rem, 2.5vw, 1rem);
    margin-top: var(--spacing-xs);
}

/* ── Display Panel ────────────────────────────────── */
.machine__display {
    background: var(--color-display);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    border: 1px solid rgba(57, 217, 138, 0.15);
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.display__text {
    color: var(--color-display-text);
    font-family: 'Courier New', monospace;
    font-size: clamp(0.85rem, 2.5vw, 1rem);
    font-weight: 600;
    letter-spacing: 0.04em;
}

/* ── Product Grid ─────────────────────────────────── */
.machine__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* ── Product Card ─────────────────────────────────── */
.product-card {
    --card-color: #888;
    background: var(--color-machine-inner);
    border: 2px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-sm);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    transition:
        transform var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast),
        background var(--transition-fast);
    position: relative;
    font-family: inherit;
    color: inherit;
    min-height: 110px;
    justify-content: center;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--card-color);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.product-card:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.15);
    background: var(--color-card-hover);
    box-shadow: var(--shadow-card);
}

.product-card:hover::before {
    opacity: 1;
}

.product-card:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.product-card:active {
    transform: translateY(0) scale(0.97);
}

.product-card--selected {
    border-color: var(--color-accent);
    background: var(--color-card-active);
    box-shadow: var(--shadow-glow);
    animation: pulse-glow 0.6s ease;
}

.product-card--disabled {
    opacity: 0.4;
    pointer-events: none;
    cursor: not-allowed;
}

.product-card__emoji {
    font-size: 2rem;
    line-height: 1;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
    transition: transform var(--transition-fast);
}

.product-card:hover .product-card__emoji {
    transform: scale(1.15);
}

.product-card__name {
    font-size: 0.85rem;
    font-weight: 600;
    text-align: center;
    line-height: 1.2;
}

.product-card__category {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* ── Dispense Zone ────────────────────────────────── */
.machine__dispense {
    background: var(--color-dispense-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.04);
    position: relative;
    overflow: hidden;
}

.dispense__slot {
    position: relative;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dispense__item {
    font-size: 3rem;
    opacity: 0;
    transform: translateY(-60px) scale(0.3);
    transition: none;
    position: absolute;
}

.dispense__item--dropping {
    animation: drop-item 700ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.dispense__item--idle {
    opacity: 1;
    transform: translateY(0) scale(1);
    animation: gentle-bounce 2s ease-in-out infinite;
}

/* ── Message Zone ─────────────────────────────────── */
.machine__message {
    text-align: center;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.message__text {
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
    font-weight: 600;
    color: var(--color-success);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.message__text--visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Animations ───────────────────────────────────── */
@keyframes drop-item {
    0% {
        opacity: 0;
        transform: translateY(-60px) scale(0.3);
    }
    40% {
        opacity: 1;
        transform: translateY(10px) scale(1.1);
    }
    60% {
        transform: translateY(-5px) scale(0.95);
    }
    80% {
        transform: translateY(3px) scale(1.02);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes gentle-bounce {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-4px) scale(1.03); }
}

@keyframes pulse-glow {
    0% { box-shadow: 0 0 0 0 var(--color-accent-glow); }
    50% { box-shadow: 0 0 20px 5px var(--color-accent-glow); }
    100% { box-shadow: var(--shadow-glow); }
}

/* ── Staggered Reveal ─────────────────────────────── */
.product-card {
    opacity: 0;
    transform: translateY(20px);
    animation: card-reveal 400ms ease forwards;
}

.product-card:nth-child(1)  { animation-delay:  50ms; }
.product-card:nth-child(2)  { animation-delay: 100ms; }
.product-card:nth-child(3)  { animation-delay: 150ms; }
.product-card:nth-child(4)  { animation-delay: 200ms; }
.product-card:nth-child(5)  { animation-delay: 250ms; }
.product-card:nth-child(6)  { animation-delay: 300ms; }
.product-card:nth-child(7)  { animation-delay: 350ms; }
.product-card:nth-child(8)  { animation-delay: 400ms; }
.product-card:nth-child(9)  { animation-delay: 450ms; }
.product-card:nth-child(10) { animation-delay: 500ms; }
.product-card:nth-child(11) { animation-delay: 550ms; }
.product-card:nth-child(12) { animation-delay: 600ms; }

@keyframes card-reveal {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Confetti Canvas ──────────────────────────────── */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
}

/* ── Reduced Motion ───────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .product-card {
        opacity: 1;
        transform: none;
    }

    .dispense__item--dropping {
        animation: none;
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ── Responsive ───────────────────────────────────── */
@media (max-width: 480px) {
    .machine {
        padding: var(--spacing-md);
        border-radius: var(--radius-lg);
    }

    .machine__grid {
        grid-template-columns: repeat(auto-fill, minmax(95px, 1fr));
        gap: var(--spacing-sm);
    }

    .product-card {
        padding: var(--spacing-sm) var(--spacing-xs);
        min-height: 90px;
    }

    .product-card__emoji {
        font-size: 1.6rem;
    }

    .product-card__name {
        font-size: 0.75rem;
    }

    .machine__dispense {
        padding: var(--spacing-md);
        min-height: 70px;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .machine__grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    }
}