/**
 * NihongoDoya - Kanji Speed Blitz Stylesheet
 * Neo-Brutalist Watery Game UI with High-Velocity Blitz Accents
 */

:root {
    --ksb-ink: #0f172a;
    --ksb-paper: #ffffff;
    --ksb-bg-mist: #f0f9ff;
    --ksb-surface-card: #fdfdfd;
    --ksb-water-border: #0284c7;
    --ksb-accent-yellow: #fde047;
    --ksb-accent-amber: #f59e0b;
    --ksb-correct-bg: #ccfbf1;
    --ksb-correct-border: #0f766e;
    --ksb-correct-text: #115e59;
    --ksb-wrong-bg: #fee2e2;
    --ksb-wrong-border: #dc2626;
    --ksb-wrong-text: #991b1b;
    --ksb-shadow: 4px 4px 0px var(--ksb-ink);
    --ksb-shadow-sm: 2px 2px 0px var(--ksb-ink);
    --ksb-shadow-lg: 6px 6px 0px var(--ksb-ink);
}

/* --------------------------------------------------------------------------
   Container & Global Layout
-------------------------------------------------------------------------- */
.ksb-game-container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 16px 40px;
}

/* --------------------------------------------------------------------------
   Setup & Base Cards
-------------------------------------------------------------------------- */
.ksb-card {
    background: var(--ksb-paper);
    border: 2.5px solid var(--ksb-ink);
    border-radius: 16px;
    box-shadow: var(--ksb-shadow-lg);
    padding: 32px 28px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
}

.ksb-setup-header {
    text-align: center;
    margin-bottom: 24px;
}

.ksb-setup-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--ksb-ink);
    margin: 0 0 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.ksb-setup-title i {
    color: var(--ksb-accent-amber);
    filter: drop-shadow(2px 2px 0px var(--ksb-ink));
}

.ksb-setup-subtitle {
    font-size: 1.05rem;
    color: #475569;
    margin: 0;
    font-weight: 500;
}

.ksb-high-score-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #f0fdf4;
    border: 2px solid #16a34a;
    border-radius: 10px;
    padding: 10px 16px;
    margin-bottom: 24px;
    font-weight: 600;
    color: #15803d;
    box-shadow: 2px 2px 0px #16a34a;
}

.ksb-high-score-banner strong {
    font-size: 1.1rem;
    color: #14532d;
}

.ksb-option-group {
    margin-bottom: 22px;
}

.ksb-option-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    margin-bottom: 8px;
}

.ksb-chips-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.ksb-chip {
    background: var(--ksb-paper);
    border: 2px solid var(--ksb-ink);
    border-radius: 9999px;
    padding: 8px 18px;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--ksb-ink);
    cursor: pointer;
    box-shadow: 2px 2px 0px var(--ksb-ink);
    transition: all 0.12s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
}

.ksb-chip:hover {
    transform: translate(-1px, -1px);
    box-shadow: 3px 3px 0px var(--ksb-ink);
    background: #fafafa;
}

.ksb-chip:active {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0px var(--ksb-ink);
}

.ksb-chip.active {
    background: var(--ksb-accent-yellow);
    border-color: var(--ksb-ink);
    box-shadow: 3px 3px 0px var(--ksb-ink);
}

.ksb-badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #fef3c7;
    border: 1.5px solid #d97706;
    color: #92400e;
    font-weight: 700;
    font-size: 0.88rem;
    padding: 6px 14px;
    border-radius: 9999px;
}

/* --------------------------------------------------------------------------
   In-Game HUD
-------------------------------------------------------------------------- */
.ksb-hud {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--ksb-paper);
    border: 2.5px solid var(--ksb-ink);
    border-radius: 14px;
    padding: 12px 20px;
    margin-bottom: 16px;
    box-shadow: var(--ksb-shadow);
}

.ksb-hud-item {
    display: flex;
    flex-direction: column;
}

.ksb-hud-label {
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: #64748b;
    text-transform: uppercase;
    line-height: 1;
    margin-bottom: 2px;
}

.ksb-hud-val {
    font-size: 1.45rem;
    font-weight: 900;
    color: var(--ksb-ink);
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}

.ksb-streak-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: #fff7ed;
    border: 2px solid #ea580c;
    color: #c2410c;
    font-size: 1rem;
    font-weight: 800;
    padding: 6px 14px;
    border-radius: 9999px;
    box-shadow: 2px 2px 0px #ea580c;
    transition: transform 0.15s ease, background-color 0.15s ease;
}

.ksb-streak-badge.hot {
    background: #ffedd5;
    border-color: #f97316;
    color: #ea580c;
    animation: ksbPulse 1.2s infinite alternate;
}

.ksb-timer-display {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 1.45rem;
    font-weight: 900;
    color: var(--ksb-ink);
    font-variant-numeric: tabular-nums;
}

.ksb-timer-display i {
    color: #0284c7;
}

.ksb-timer-display.is-urgent {
    color: #dc2626;
    animation: ksbTimerUrgent 0.6s infinite alternate;
}

.ksb-timer-display.is-urgent i {
    color: #dc2626;
}

@keyframes ksbTimerUrgent {
    0% { transform: scale(1); }
    100% { transform: scale(1.08); }
}

@keyframes ksbPulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.04); }
}

.ksb-hud-btn {
    background: var(--ksb-paper);
    border: 2px solid var(--ksb-ink);
    border-radius: 10px;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    color: var(--ksb-ink);
    cursor: pointer;
    box-shadow: 2px 2px 0px var(--ksb-ink);
    transition: all 0.12s ease;
}

.ksb-hud-btn:hover {
    transform: translate(-1px, -1px);
    box-shadow: 3px 3px 0px var(--ksb-ink);
    background: #f8fafc;
}

/* --------------------------------------------------------------------------
   Play Arena & Giant Kanji Card
-------------------------------------------------------------------------- */
.ksb-arena {
    position: relative;
    background: var(--ksb-bg-mist);
    border: 2.5px solid var(--ksb-ink);
    border-radius: 16px;
    box-shadow: var(--ksb-shadow-lg);
    padding: 30px 24px;
    margin-bottom: 20px;
    overflow: hidden;
}

/* Subtle watery speed background lines */
.ksb-arena::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 12px 12px, rgba(2, 132, 199, 0.08) 1.5px, transparent 1.5px),
        repeating-linear-gradient(135deg, transparent, transparent 35px, rgba(2, 132, 199, 0.03) 35px, rgba(2, 132, 199, 0.03) 70px);
    background-size: 24px 24px, auto;
    pointer-events: none;
}

/* Combo Toast Floating Badge */
.ksb-combo-toast {
    position: absolute;
    top: 18px;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: #fde047;
    border: 2px solid var(--ksb-ink);
    border-radius: 9999px;
    padding: 4px 16px;
    font-size: 0.88rem;
    font-weight: 800;
    color: var(--ksb-ink);
    box-shadow: 2px 2px 0px var(--ksb-ink);
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 10;
}

.ksb-combo-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Giant Kanji Stage */
.ksb-kanji-stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--ksb-paper);
    border: 2.5px solid var(--ksb-ink);
    border-radius: 16px;
    padding: 24px 20px 20px;
    box-shadow: var(--ksb-shadow);
    margin-bottom: 24px;
    position: relative;
    user-select: none;
    transition: transform 0.15s ease;
}

.ksb-prompt-pill {
    background: #e0f2fe;
    border: 1.5px solid #0284c7;
    color: #0369a1;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 4px 14px;
    border-radius: 9999px;
    margin-bottom: 8px;
}

.ksb-kanji-glyph {
    font-family: 'Noto Sans JP', 'Hiragino Sans', 'Meiryo', sans-serif;
    font-size: clamp(96px, 18vw, 156px);
    font-weight: 800;
    color: var(--ksb-ink);
    line-height: 1.05;
    margin: 4px 0 8px;
    text-align: center;
    transition: transform 0.12s ease, opacity 0.12s ease;
}

.ksb-kanji-glyph.enter {
    animation: ksbGlyphEnter 0.16s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes ksbGlyphEnter {
    0% { transform: scale(0.85); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

/* Floating Points Indicator */
.ksb-floating-score {
    position: absolute;
    top: 25%;
    right: 20%;
    font-size: 1.6rem;
    font-weight: 900;
    color: #0f766e;
    text-shadow: 1.5px 1.5px 0px #ffffff;
    pointer-events: none;
    z-index: 25;
    animation: ksbFloatUp 0.65s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes ksbFloatUp {
    0% { transform: translateY(0) scale(0.8); opacity: 1; }
    100% { transform: translateY(-36px) scale(1.15); opacity: 0; }
}

/* --------------------------------------------------------------------------
   2x2 Answer Choices Grid
-------------------------------------------------------------------------- */
.ksb-choices-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.ksb-choice-btn {
    background: var(--ksb-paper);
    border: 2.5px solid var(--ksb-ink);
    border-radius: 14px;
    padding: 16px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    box-shadow: var(--ksb-shadow);
    transition: all 0.12s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
    position: relative;
    outline: none;
    min-height: 64px;
}

.ksb-choice-btn:hover:not(:disabled) {
    transform: translate(-2px, -2px);
    box-shadow: var(--ksb-shadow-lg);
    background: #f8fafc;
}

.ksb-choice-btn:focus-visible {
    outline: 3px solid var(--ksb-accent-amber);
    outline-offset: 2px;
}

.ksb-choice-key {
    background: #f1f5f9;
    border: 1.5px solid var(--ksb-ink);
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--ksb-ink);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ksb-choice-text {
    font-size: clamp(1.02rem, 2.5vw, 1.25rem);
    font-weight: 700;
    color: var(--ksb-ink);
    line-height: 1.25;
    flex: 1;
    word-break: break-word;
}

/* Correct & Wrong Answer Feedback */
.ksb-choice-btn.is-correct {
    background: var(--ksb-correct-bg) !important;
    border-color: var(--ksb-correct-border) !important;
    color: var(--ksb-correct-text) !important;
    box-shadow: 2px 2px 0px var(--ksb-correct-border) !important;
    transform: scale(1.02);
}

.ksb-choice-btn.is-correct .ksb-choice-key {
    background: #99f6e4;
    border-color: var(--ksb-correct-border);
    color: var(--ksb-correct-text);
}

.ksb-choice-btn.is-wrong {
    background: var(--ksb-wrong-bg) !important;
    border-color: var(--ksb-wrong-border) !important;
    color: var(--ksb-wrong-text) !important;
    box-shadow: 2px 2px 0px var(--ksb-wrong-border) !important;
    animation: ksbShake 0.28s ease;
}

.ksb-choice-btn.is-wrong .ksb-choice-key {
    background: #fecaca;
    border-color: var(--ksb-wrong-border);
    color: var(--ksb-wrong-text);
}

@keyframes ksbShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

/* --------------------------------------------------------------------------
   Countdown Overlay
-------------------------------------------------------------------------- */
.ksb-countdown-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.85);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 50;
    border-radius: 14px;
    backdrop-filter: blur(4px);
}

.ksb-countdown-number {
    font-size: clamp(5rem, 15vw, 9rem);
    font-weight: 900;
    color: var(--ksb-accent-yellow);
    text-shadow: 4px 4px 0px var(--ksb-ink);
    line-height: 1;
    animation: ksbCountZoom 0.65s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes ksbCountZoom {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}

.ksb-countdown-sub {
    font-size: 1.25rem;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-top: 12px;
}

/* --------------------------------------------------------------------------
   Pause & Exit Modals
-------------------------------------------------------------------------- */
.ksb-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(3px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 40;
    border-radius: 14px;
    padding: 16px;
}

.ksb-modal {
    background: var(--ksb-paper);
    border: 2.5px solid var(--ksb-ink);
    border-radius: 14px;
    padding: 28px 24px;
    max-width: 380px;
    width: 100%;
    box-shadow: var(--ksb-shadow-lg);
    text-align: center;
}

.ksb-modal-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--ksb-ink);
    margin: 0 0 8px;
}

.ksb-modal-text {
    font-size: 0.95rem;
    color: #475569;
    margin: 0 0 20px;
}

.ksb-modal-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* --------------------------------------------------------------------------
   Game Over Results Screen
-------------------------------------------------------------------------- */
.ksb-results-card {
    background: var(--ksb-paper);
    border: 2.5px solid var(--ksb-ink);
    border-radius: 16px;
    box-shadow: var(--ksb-shadow-lg);
    padding: 36px 28px;
    text-align: center;
}

.ksb-results-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #fef3c7;
    border: 2px solid #d97706;
    color: #92400e;
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 6px 14px;
    border-radius: 9999px;
    margin-bottom: 12px;
}

.ksb-results-title {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 900;
    color: var(--ksb-ink);
    margin: 0 0 6px;
}

.ksb-final-score {
    font-size: clamp(2.6rem, 7vw, 4rem);
    font-weight: 900;
    color: #0284c7;
    margin-bottom: 4px;
    line-height: 1;
}

.ksb-new-high-badge {
    display: inline-block;
    background: #dcfce7;
    border: 1.5px solid #16a34a;
    color: #15803d;
    font-weight: 800;
    font-size: 0.9rem;
    padding: 4px 12px;
    border-radius: 9999px;
    margin-bottom: 24px;
}

.ksb-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin: 24px 0 28px;
}

.ksb-stat-box {
    background: #f8fafc;
    border: 2px solid var(--ksb-ink);
    border-radius: 12px;
    padding: 14px 8px;
    box-shadow: 2px 2px 0px var(--ksb-ink);
}

.ksb-stat-box-num {
    font-size: 1.35rem;
    font-weight: 900;
    color: var(--ksb-ink);
    line-height: 1.1;
    margin-bottom: 2px;
}

.ksb-stat-box-lbl {
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
}

/* Needs Review Section */
.ksb-review-section {
    background: #fafafa;
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    padding: 18px 16px;
    margin-bottom: 28px;
    text-align: left;
}

.ksb-review-title {
    font-size: 0.85rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #475569;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.ksb-review-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ksb-review-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--ksb-paper);
    border: 1.5px solid #cbd5e1;
    border-radius: 8px;
    padding: 8px 14px;
    font-size: 0.92rem;
}

.ksb-review-item .char {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--ksb-ink);
    margin-right: 8px;
}

.ksb-review-item .details {
    color: #334155;
    font-weight: 600;
    flex: 1;
}

.ksb-review-item .user-wrong {
    font-size: 0.82rem;
    color: #dc2626;
    margin-left: 8px;
}

.ksb-results-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

/* --------------------------------------------------------------------------
   Responsive Adjustments
-------------------------------------------------------------------------- */
@media (max-width: 680px) {
    .ksb-card {
        padding: 24px 18px;
    }

    .ksb-arena {
        padding: 20px 14px;
    }

    .ksb-kanji-stage {
        padding: 16px 12px;
    }

    .ksb-choices-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .ksb-choice-btn {
        padding: 12px 14px;
        min-height: 54px;
    }

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