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

:root {
    --bg-dark: #0a0a12;
    --bg-card: #14141f;
    --bg-tile: #1e1e2e;
    --accent-primary: #ff2d55;
    --accent-secondary: #ff9500;
    --accent-tertiary: #5e5ce6;
    --accent-cyan: #00d4ff;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --glow-primary: 0 0 20px rgba(255, 45, 85, 0.5);
    --glow-secondary: 0 0 20px rgba(255, 149, 0, 0.5);
    --tile-size: min(11vw, 80px);
    --board-gap: 2px;
    --border-radius: 10px;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Segoe UI', 'Hiragino Sans', 'Meiryo', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}

/* === Screens === */
.screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    z-index: 1;
}

.screen.active {
    opacity: 1;
    pointer-events: all;
    z-index: 10;
}

/* === Title Screen === */
.title-container {
    text-align: center;
    animation: floatIn 0.8s ease-out;
}

.title-emoji {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    animation: pulse 2s infinite;
}

.title-text {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    letter-spacing: 0.05em;
    text-shadow: none;
    filter: drop-shadow(0 0 30px rgba(255, 45, 85, 0.3));
}

.title-sub {
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.3em;
    margin-top: 0.3rem;
}

.title-rules {
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.8;
}

/* === Buttons === */
.btn-primary {
    display: inline-block;
    padding: 14px 48px;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: var(--glow-primary);
    transition: transform 0.15s, box-shadow 0.15s;
    letter-spacing: 0.1em;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(255, 45, 85, 0.7);
}

.btn-primary:active {
    transform: scale(0.97);
}

.btn-secondary {
    padding: 8px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid #333;
    border-radius: 25px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.btn-secondary:hover {
    background: #222;
    color: var(--text-primary);
}

/* === Game Header === */
.game-header {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    padding: 8px 12px;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.stat-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 6px 16px;
    min-width: 70px;
    border: 1px solid #222;
}

.score-box {
    flex: 1;
}

.stat-label {
    font-size: 0.65rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === Level Progress === */
.level-progress {
    position: relative;
    width: calc(100% - 24px);
    max-width: 476px;
    height: 20px;
    background: var(--bg-card);
    border-radius: 10px;
    margin: 4px auto 8px;
    overflow: hidden;
    border: 1px solid #222;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-tertiary), var(--accent-primary), var(--accent-secondary));
    border-radius: 10px;
    transition: width 0.5s ease;
}

.progress-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 1px 3px rgba(0,0,0,0.8);
}

/* === Board === */
.board-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 6px;
}

.board {
    display: grid;
    grid-template-columns: repeat(8, var(--tile-size));
    grid-template-rows: repeat(8, var(--tile-size));
    gap: var(--board-gap);
    background: var(--bg-card);
    padding: 6px;
    border-radius: 12px;
    border: 2px solid #222;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5), inset 0 0 30px rgba(0, 0, 0, 0.3);
    position: relative;
}

/* === Tiles === */
.tile {
    width: var(--tile-size);
    height: var(--tile-size);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: calc(var(--tile-size) * 0.6);
    background: var(--bg-tile);
    border-radius: 8px;
    cursor: pointer;
    position: relative;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    will-change: transform;
    overflow: hidden;
}

.tile img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 6px;
    pointer-events: none;
}

.tile:hover {
    transform: scale(1.08);
    z-index: 2;
}

.tile:active {
    transform: scale(0.95);
}

.tile.selected {
    box-shadow: 0 0 0 3px var(--accent-cyan), 0 0 15px var(--accent-cyan);
    transform: scale(1.1);
    z-index: 3;
    animation: selectedPulse 0.8s infinite;
}

.tile.hint {
    animation: hintPulse 0.6s ease-in-out 3;
}

.tile.swapping {
    transition: transform 0.25s ease-in-out;
    z-index: 5;
}

.tile.falling {
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.tile.spawning {
    animation: spawnIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.tile.matched {
    animation: matchPop 0.35s ease-out forwards;
    pointer-events: none;
}

.tile.invalid-swap {
    animation: shakeInvalid 0.4s ease;
}

/* === Particles === */
.particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    pointer-events: none;
    animation: particleFly 0.7s ease-out forwards;
}

.combo-text {
    position: absolute;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent-secondary);
    text-shadow: 0 0 10px rgba(255, 149, 0, 0.8);
    pointer-events: none;
    animation: comboFloat 1s ease-out forwards;
    z-index: 100;
    white-space: nowrap;
}

.score-popup {
    position: absolute;
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-cyan);
    text-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
    pointer-events: none;
    animation: scoreFloat 0.8s ease-out forwards;
    z-index: 100;
}

/* === Game Footer === */
.game-footer {
    display: flex;
    justify-content: center;
    padding: 8px;
}

/* === Popup Screens === */
.popup-container {
    text-align: center;
    background: var(--bg-card);
    padding: 2rem 2.5rem;
    border-radius: 20px;
    border: 2px solid #333;
    box-shadow: 0 0 60px rgba(255, 45, 85, 0.2);
    animation: floatIn 0.5s ease-out;
    max-width: 340px;
    width: 90%;
}

.popup-emoji {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.popup-title {
    font-size: 1.8rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.popup-msg {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.popup-score {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
}

.popup-detail {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.popup-container .btn-primary {
    margin-top: 1.2rem;
}

/* === Screen Shake === */
.shake {
    animation: screenShake 0.4s ease;
}

/* === Animations === */
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes selectedPulse {
    0%, 100% { box-shadow: 0 0 0 3px var(--accent-cyan), 0 0 15px var(--accent-cyan); }
    50% { box-shadow: 0 0 0 3px var(--accent-cyan), 0 0 25px var(--accent-cyan); }
}

@keyframes hintPulse {
    0%, 100% { box-shadow: none; transform: scale(1); }
    50% { box-shadow: 0 0 0 3px var(--accent-secondary), 0 0 20px var(--accent-secondary); transform: scale(1.12); }
}

@keyframes matchPop {
    0% { transform: scale(1); opacity: 1; }
    40% { transform: scale(1.4); opacity: 0.8; }
    100% { transform: scale(0); opacity: 0; }
}

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

@keyframes shakeInvalid {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

@keyframes floatIn {
    0% { transform: translateY(30px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

@keyframes particleFly {
    0% { transform: translate(0, 0) scale(1); opacity: 1; }
    100% { transform: translate(var(--px), var(--py)) scale(0); opacity: 0; }
}

@keyframes comboFloat {
    0% { transform: translate(-50%, 0) scale(0.5); opacity: 0; }
    30% { transform: translate(-50%, -10px) scale(1.2); opacity: 1; }
    100% { transform: translate(-50%, -60px) scale(1); opacity: 0; }
}

@keyframes scoreFloat {
    0% { transform: translate(-50%, 0) scale(0.8); opacity: 1; }
    100% { transform: translate(-50%, -40px) scale(1); opacity: 0; }
}

@keyframes screenShake {
    0%, 100% { transform: translate(0, 0); }
    10% { transform: translate(-4px, -2px); }
    20% { transform: translate(4px, 2px); }
    30% { transform: translate(-3px, 3px); }
    40% { transform: translate(3px, -3px); }
    50% { transform: translate(-2px, 2px); }
    60% { transform: translate(2px, -2px); }
    70% { transform: translate(-1px, 1px); }
    80% { transform: translate(1px, -1px); }
}

/* === Bilingual Text === */
.en-label {
    font-size: 0.55rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

.en-sub {
    font-size: 0.75em;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 400;
}

.en-sub-small {
    font-size: 0.75em;
    color: var(--text-secondary);
    font-weight: 400;
}

.title-rules-en {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.6;
    margin-top: -2px;
    margin-bottom: 4px;
}

.popup-title-en {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: -0.7rem;
    margin-bottom: 0.8rem;
    letter-spacing: 0.1em;
}

/* === Social Footer === */
.social-footer {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding: 8px 12px;
    margin-top: 2px;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid #333;
    border-radius: 25px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    font-family: inherit;
}

.social-link:hover {
    color: var(--text-primary);
    background: #222;
}

.social-link.patreon-link:hover {
    color: #ff424d;
    box-shadow: 0 0 12px rgba(255, 66, 77, 0.3);
    border-color: #ff424d;
}

.social-link.x-link:hover {
    color: var(--accent-cyan);
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.3);
    border-color: var(--accent-cyan);
}

.social-icon {
    width: 16px;
    height: 16px;
}

/* === Responsive === */
@media (max-width: 400px) {
    :root {
        --tile-size: 10.5vw;
    }
    .title-text { font-size: 2.4rem; }
    .stat-value { font-size: 1.1rem; }
    .stat-box { padding: 4px 10px; }
}

@media (min-width: 600px) {
    :root {
        --tile-size: 80px;
    }
}

@media (min-width: 800px) {
    :root {
        --tile-size: 90px;
    }
}

@media (min-height: 800px) {
    .board-container {
        padding: 12px 6px;
    }
}

/* Game screen layout */
#game-screen {
    flex-direction: column;
    justify-content: flex-start;
    padding-top: env(safe-area-inset-top, 8px);
}