:root {
    /* Sakura Midnight Theme */
    --bg-color: #1a0b2e;
    /* Deep Purple */
    --grid-color: rgba(255, 192, 203, 0.1);
    /* Faint Pink */
    --primary-color: #ffb7b2;
    /* Sakura Pink */
    --secondary-color: #ff69b4;
    /* Hot Pink */
    --text-color: #ffffff;
    --danger-color: #ff3333;
    --hud-bg: rgba(255, 183, 178, 0.1);
    --font-main: 'Outfit', sans-serif;
    --font-jap: 'Zen Maru Gothic', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

.game-container {
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 800px;
    /* Limit width on desktop */
    background: radial-gradient(circle at center, #2d1b4e 0%, #0d001a 100%);
    overflow: hidden;
    box-shadow: 0 0 50px rgba(255, 105, 180, 0.2);
}

/* Background Grid Effect */
.bg-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    transform: perspective(500px) rotateX(60deg) translateY(-100px) translateZ(-200px);
    animation: gridMove 20s linear infinite;
    z-index: 0;
    pointer-events: none;
}

@keyframes gridMove {
    0% {
        transform: perspective(500px) rotateX(60deg) translateY(0) translateZ(-200px);
    }

    100% {
        transform: perspective(500px) rotateX(60deg) translateY(40px) translateZ(-200px);
    }
}

/* HUD */
.hud {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    z-index: 10;
    pointer-events: none;
    /* Let clicks pass through */
}

.stat-box {
    background: var(--hud-bg);
    backdrop-filter: blur(5px);
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 1px;
}

.value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0 0 10px var(--primary-color);
}

.lives {
    font-size: 1.5rem;
    color: var(--danger-color);
}

/* Game Area */
.game-area {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
}

/* Falling Characters */
.kana-item {
    position: absolute;
    font-family: var(--font-jap);
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 10px var(--secondary-color), 0 0 20px var(--secondary-color);
    font-size: 2.5rem;
    transform: translateX(-50%);
    transition: top 0.1s linear;
    /* Smooth movement handled by JS, but this helps */
    text-align: center;
}

.kana-item .romaji-hint {
    display: block;
    font-size: 0.8rem;
    font-family: var(--font-main);
    color: rgba(255, 255, 255, 0.5);
    margin-top: -5px;
    opacity: 0;
    /* Hidden by default, maybe show on easy mode? Or just keep hidden */
}

.kana-item.matched {
    color: var(--primary-color);
    text-shadow: 0 0 20px var(--primary-color), 0 0 40px var(--primary-color);
    transform: translateX(-50%) scale(1.5);
    opacity: 0;
    transition: all 0.2s ease-out;
}

/* Input Feedback */
.input-feedback-container {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column-reverse;
    /* Newest at bottom */
    align-items: center;
    gap: 5px;
    pointer-events: none;
    z-index: 20;
}

.feedback-item {
    font-size: 3rem;
    font-weight: 700;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.5);
    transition: all 0.2s ease;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.feedback-item.active {
    color: #fff;
    transform: scale(1.1);
}

.feedback-item.success {
    color: var(--primary-color);
    /* Green/Cyan */
    text-shadow: 0 0 20px var(--primary-color);
    animation: fadeOutUp 1.5s forwards;
}

.feedback-item.error {
    color: var(--danger-color);
    /* Red */
    text-shadow: 0 0 20px var(--danger-color);
    animation: shakeAndFade 1.5s forwards;
}

@keyframes fadeOutUp {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1.1);
    }

    100% {
        opacity: 0;
        transform: translateY(-50px) scale(1);
    }
}

@keyframes shakeAndFade {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0;
        transform: translateY(20px);
    }
}

/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 18, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 20;
    transition: opacity 0.3s ease;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 5px;
    text-shadow: 0 0 20px rgba(255, 105, 180, 0.5);
}

.highlight {
    color: var(--secondary-color);
    text-shadow: 0 0 20px var(--secondary-color);
}

.subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
}

.mode-select {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.btn {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 10px 20px;
    font-family: var(--font-main);
    font-size: 1rem;
    cursor: pointer;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.btn:hover,
.btn.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 15px var(--primary-color);
    background: rgba(255, 183, 178, 0.1);
}

.btn-primary {
    background: var(--secondary-color);
    color: #fff;
    border: none;
    padding: 15px 50px;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 0 20px var(--secondary-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    font-family: var(--font-main);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 0 40px var(--secondary-color);
}

transition: top 0.1s linear;
/* Smooth movement handled by JS, but this helps */
text-align: center;
}

.kana-item .romaji-hint {
    display: block;
    font-size: 0.8rem;
    font-family: var(--font-main);
    color: rgba(255, 255, 255, 0.5);
    margin-top: -5px;
    opacity: 0;
    /* Hidden by default, maybe show on easy mode? Or just keep hidden */
}

.kana-item.matched {
    color: var(--primary-color);
    text-shadow: 0 0 20px var(--primary-color), 0 0 40px var(--primary-color);
    transform: translateX(-50%) scale(1.5);
    opacity: 0;
    transition: all 0.2s ease-out;
}

/* Input Feedback */
.input-feedback-container {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column-reverse;
    /* Newest at bottom */
    align-items: center;
    gap: 5px;
    pointer-events: none;
    z-index: 20;
}

.feedback-item {
    font-size: 3rem;
    font-weight: 700;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.5);
    transition: all 0.2s ease;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.feedback-item.active {
    color: #fff;
    transform: scale(1.1);
}

.feedback-item.success {
    color: var(--primary-color);
    /* Green/Cyan */
    text-shadow: 0 0 20px var(--primary-color);
    animation: fadeOutUp 1.5s forwards;
}

.feedback-item.error {
    color: var(--danger-color);
    /* Red */
    text-shadow: 0 0 20px var(--danger-color);
    animation: shakeAndFade 1.5s forwards;
}

@keyframes fadeOutUp {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1.1);
    }

    100% {
        opacity: 0;
        transform: translateY(-50px) scale(1);
    }
}

@keyframes shakeAndFade {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0;
        transform: translateY(20px);
    }
}

/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 18, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 20;
    transition: opacity 0.3s ease;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 5px;
    text-shadow: 0 0 20px rgba(255, 105, 180, 0.5);
}

.highlight {
    color: var(--secondary-color);
    text-shadow: 0 0 20px var(--secondary-color);
}

.subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
}

.mode-select {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.btn {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 10px 20px;
    font-family: var(--font-main);
    font-size: 1rem;
    cursor: pointer;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.btn:hover,
.btn.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 15px var(--primary-color);
    background: rgba(255, 183, 178, 0.1);
}

.btn-primary {
    background: var(--secondary-color);
    color: #fff;
    border: none;
    padding: 15px 50px;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 0 20px var(--secondary-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    font-family: var(--font-main);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 0 40px var(--secondary-color);
}

.text-danger {
    color: var(--danger-color);
    text-shadow: 0 0 20px var(--danger-color);
}

/* Responsive */
@media (max-width: 600px) {
    .title {
        font-size: 2.5rem;
    }

    .kana-item {
        font-size: 2rem;
    }

    .hud {
        padding: 10px;
    }

    .value {
        font-size: 1.2rem;
    }
}

/* New UI Elements */
.extra-menu {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 10px 30px;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    border-radius: 30px;
    transition: all 0.3s ease;
    text-transform: uppercase;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--bg-color);
    box-shadow: 0 0 20px var(--primary-color);
}

.review-links {
    display: flex;
    gap: 20px;
}

.btn-link {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
    border-bottom: 1px solid transparent;
}

.btn-link:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.high-score-display {
    margin-bottom: 20px;
    font-size: 1.2rem;
    color: var(--primary-color);
    text-shadow: 0 0 10px var(--primary-color);
}

/* Modal */
.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: rgba(26, 11, 46, 0.95);
    border: 2px solid var(--primary-color);
    padding: 40px;
    border-radius: 20px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: 0 0 50px rgba(255, 183, 178, 0.2);
    transform: scale(1);
    transition: transform 0.3s ease;
}

.modal-overlay.hidden .modal-content {
    transform: scale(0.8);
}

.modal-content h2 {
    color: var(--secondary-color);
    font-size: 2rem;
    margin-bottom: 20px;
    text-shadow: 0 0 10px var(--secondary-color);
}

.modal-content ul {
    text-align: left;
    margin-bottom: 30px;
    list-style: none;
}

.modal-content li {
    margin-bottom: 15px;
    font-size: 1.1rem;
    line-height: 1.4;
}

.modal-content strong {
    color: var(--primary-color);
}