/* bubble_sort.css – Game-specific styling for the Bubble Sort practice game
   Extends the design tokens already defined in style.css (dark glass theme,
   Outfit type, indigo/violet gradient). Nothing here overrides the shared
   site chrome (sidebar, nav, breadcrumbs) — that stays in style.css. */

:root {
    --tier-easy: #6366f1;
    --tier-medium: #a855f7;
    --tier-hard: #fb923c;
    --warning: #f59e0b;
}

/* ------------------------------------------------------------
   Core utility — several elements in the markup rely on this
   class to hide/show screens; it wasn't defined anywhere yet.
   ------------------------------------------------------------ */
.hidden {
    display: none !important;
}

/* The decorative backdrop div and the game's own max-width were
   also referenced in the markup without a rule anywhere. */
.bg-gradient {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        radial-gradient(circle at 20% 20%, rgba(192, 132, 252, 0.12) 0%, transparent 45%),
        radial-gradient(circle at 80% 75%, rgba(99, 102, 241, 0.12) 0%, transparent 45%);
}

.game-container {
    max-width: 640px;
}

/* Give every screen a single, quiet entrance instead of a hard cut. */
.screen {
    animation: fadeInUp 0.45s ease-out;
}

/* ------------------------------------------------------------
   Session timer bar (top of page during a session)
   ------------------------------------------------------------ */
#session-timer-container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #c084fc);
    border-radius: 999px;
    transition: width 1s linear, background 0.4s ease;
}

.progress-fill.low-time {
    background: linear-gradient(90deg, var(--error), var(--warning));
}

.session-time-text {
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* ------------------------------------------------------------
   Instructions screen
   ------------------------------------------------------------ */
.rules-box {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.rules-box h2 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.rules-box ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.rules-box li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

.rules-box li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: linear-gradient(135deg, #c084fc, var(--primary));
}

.rules-box strong {
    color: var(--text-main);
    font-weight: 700;
}

.difficulty-section {
    margin: 1.75rem 0;
}

.difficulty-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.85rem;
}

.difficulty-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.diff-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1.5px solid var(--glass-border);
    color: var(--text-muted);
    padding: 0.85rem 0.5rem;
    border-radius: 14px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.diff-btn:hover {
    border-color: rgba(255, 255, 255, 0.25);
    color: var(--text-main);
    transform: translateY(-2px);
}

.diff-btn[data-level="easy"].active {
    border-color: var(--tier-easy);
    color: #fff;
    background: rgba(99, 102, 241, 0.15);
    box-shadow: 0 8px 18px -8px rgba(99, 102, 241, 0.6);
}

.diff-btn[data-level="medium"].active {
    border-color: var(--tier-medium);
    color: #fff;
    background: rgba(168, 85, 247, 0.15);
    box-shadow: 0 8px 18px -8px rgba(168, 85, 247, 0.6);
}

.diff-btn[data-level="hard"].active {
    border-color: var(--tier-hard);
    color: #fff;
    background: rgba(251, 146, 60, 0.15);
    box-shadow: 0 8px 18px -8px rgba(251, 146, 60, 0.6);
}

/* ------------------------------------------------------------
   Gameplay screen
   ------------------------------------------------------------ */
.gameplay-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.round-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
}

.round-counter {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
    white-space: nowrap;
}

.tier-badge {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    width: fit-content;
}

.tier-badge.tier-easy {
    background: rgba(99, 102, 241, 0.15);
    color: var(--tier-easy);
    border: 1px solid rgba(99, 102, 241, 0.35);
}

.tier-badge.tier-medium {
    background: rgba(168, 85, 247, 0.15);
    color: var(--tier-medium);
    border: 1px solid rgba(168, 85, 247, 0.35);
}

.tier-badge.tier-hard {
    background: rgba(251, 146, 60, 0.15);
    color: var(--tier-hard);
    border: 1px solid rgba(251, 146, 60, 0.35);
}

.round-timer {
    position: relative;
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.timer-bg {
    stroke: rgba(255, 255, 255, 0.08);
}

.timer-ring {
    stroke: var(--success);
    stroke-linecap: round;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
    transition: stroke-dashoffset 1s linear, stroke 0.3s ease;
}

.timer-ring.high {
    stroke: var(--success);
}

.timer-ring.mid {
    stroke: var(--warning);
}

.timer-ring.low {
    stroke: var(--error);
}

.timer-ring.pulse-ring {
    animation: ringPulse 1s ease-in-out infinite;
}

.timer-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-main);
}

.stat-pills {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.4rem;
}

.move-counter,
.streak-counter {
    font-size: 0.85rem;
    color: var(--text-muted);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.move-counter strong,
.streak-counter span {
    color: var(--text-main);
    display: inline-block;
}

.move-counter strong.counter-bump,
.streak-counter.bump span {
    animation: bump 0.3s ease;
}

.bubbles-area {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    padding: 2.5rem 1rem;
    min-height: 200px;
}

.bubbles-area.shake {
    animation: shakeArea 0.5s ease;
}

.bubbles-hint {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: -0.5rem;
}

.bubble {
    position: relative;
    width: 128px;
    height: 128px;
    border-radius: 50%;
    background: radial-gradient(circle at 32% 28%, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.02));
    border: 2px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    user-select: none;
    animation: bubbleFloat 4.4s ease-in-out infinite;
    transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
}

.bubble:nth-child(2) {
    animation-delay: 0.5s;
    animation-duration: 5s;
}

.bubble:nth-child(3) {
    animation-delay: 1s;
    animation-duration: 4.7s;
}

.bubble:hover,
.bubble:focus-visible {
    transform: translateY(-4px) scale(1.05);
    border-color: var(--primary);
    box-shadow: 0 12px 28px -10px rgba(99, 102, 241, 0.55);
    animation-play-state: paused;
    outline: none;
}

.bubble-expression {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-main);
    padding: 0 0.5rem;
    text-align: center;
}

.bubble.selected {
    border: 2px solid transparent;
    background: linear-gradient(var(--bg-color), var(--bg-color)) padding-box,
                linear-gradient(135deg, #c084fc, var(--primary)) border-box;
    box-shadow: 0 0 22px rgba(99, 102, 241, 0.45);
    animation-play-state: paused;
}

.bubble-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, #c084fc, var(--primary));
    color: #fff;
    font-size: 0.85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.4);
    transition: opacity 0.22s cubic-bezier(0.34, 1.56, 0.64, 1), transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
}

.bubble-badge.visible {
    opacity: 1;
    transform: scale(1);
}

.bubble.correct-flash {
    animation: correctPulse 0.8s ease;
}

.bubble.incorrect-flash {
    animation: incorrectPulse 0.8s ease;
}

.game-footer {
    display: flex;
    justify-content: center;
    margin-top: 0.5rem;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    padding: 0.85rem 1.75rem;
    border-radius: 12px;
    font-family: inherit;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.25s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--error);
    color: #fff;
    transform: translateY(-2px);
}

.text-center {
    text-align: center;
}

/* ------------------------------------------------------------
   Results screen
   ------------------------------------------------------------ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 1rem;
    margin: 1.75rem 0;
}

.stat-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.25rem 1rem;
    text-align: center;
}

.stat-value {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.stat-value.correct {
    color: var(--success);
}

.stat-value.wrong {
    color: var(--error);
}

.stat-value.streak {
    color: var(--tier-hard);
}

.stat-value.accuracy {
    background: linear-gradient(135deg, #c084fc, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.results-actions {
    display: flex;
    gap: 0.85rem;
    margin-top: 0.5rem;
}

.results-actions > * {
    flex: 1;
}

.btn-accenture-games {
    display: block;
    width: 100%;
    margin-top: 1.5rem;
    background: transparent;
    border: 1.5px solid var(--primary);
    color: var(--primary);
    padding: 0.9rem;
    border-radius: 12px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.92rem;
    cursor: pointer;
    text-align: center;
    transition: all 0.25s ease;
}

.btn-accenture-games:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 10px 22px -10px rgba(99, 102, 241, 0.55);
}

/* Confetti burst — a single celebratory moment on a strong result */
.confetti-piece {
    position: fixed;
    top: -12px;
    width: 8px;
    height: 14px;
    opacity: 0.9;
    border-radius: 2px;
    pointer-events: none;
    z-index: 3000;
    animation: confettiFall linear forwards;
}

/* ------------------------------------------------------------
   Focus visibility (keyboard users)
   ------------------------------------------------------------ */
.bubble:focus-visible,
.diff-btn:focus-visible,
.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.btn-accenture-games:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 3px;
}

/* ------------------------------------------------------------
   Keyframes
   ------------------------------------------------------------ */
@keyframes bubbleFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes correctPulse {
    0% { box-shadow: 0 0 0 rgba(16, 185, 129, 0); }
    30% { box-shadow: 0 0 30px rgba(16, 185, 129, 0.7); border-color: var(--success); }
    100% { box-shadow: 0 0 0 rgba(16, 185, 129, 0); }
}

@keyframes incorrectPulse {
    0% { box-shadow: 0 0 0 rgba(239, 68, 68, 0); }
    30% { box-shadow: 0 0 30px rgba(239, 68, 68, 0.7); border-color: var(--error); }
    100% { box-shadow: 0 0 0 rgba(239, 68, 68, 0); }
}

@keyframes shakeArea {
    10%, 90% { transform: translateX(-2px); }
    20%, 80% { transform: translateX(4px); }
    30%, 50%, 70% { transform: translateX(-8px); }
    40%, 60% { transform: translateX(8px); }
}

@keyframes bump {
    0% { transform: scale(1); }
    50% { transform: scale(1.35); color: var(--primary); }
    100% { transform: scale(1); }
}

@keyframes ringPulse {
    0%, 100% { filter: drop-shadow(0 0 0 rgba(239, 68, 68, 0)); }
    50% { filter: drop-shadow(0 0 6px rgba(239, 68, 68, 0.85)); }
}

@keyframes confettiFall {
    to { transform: translateY(110vh) rotate(540deg); opacity: 0; }
}

/* ------------------------------------------------------------
   Reduced motion
   ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
    .bubble,
    .timer-ring,
    .screen,
    .confetti-piece,
    .streak-counter,
    .move-counter strong,
    .stat-value {
        animation: none !important;
        transition-duration: 0.01ms !important;
    }
}

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 640px) {
    .bubble {
        width: 96px;
        height: 96px;
    }

    .bubble-expression {
        font-size: 1.05rem;
    }

    .difficulty-options {
        grid-template-columns: 1fr;
    }

    .status-bar {
        flex-wrap: wrap;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}