/* =============================================
   Memory Match VS - Local Multiplayer
   Mobile-first design (320px base)
   ============================================= */

/* CSS Variables */
:root {
    --color-bg: #1a1a2e;
    --color-surface: #16213e;
    --color-primary: #e94560;
    --color-secondary: #0f3460;
    --color-card-back: #0f3460;
    --color-card-front: #ffffff;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-success: #4ade80;
    --color-danger: #ef4444;
    --color-player1: #74b9ff;
    --color-player2: #fd79a8;

    --transition-speed: 0.3s;
    --card-flip-speed: 0.5s;
}

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

/* Base */
html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    min-height: 100dvh;
    line-height: 1.5;
}

/* Screen System */
.screen {
    display: none;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 16px;
}

.screen.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Container */
.container {
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.playing-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    width: 100%;
}

/* Header */
.header {
    margin-bottom: 32px;
}

.title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--color-text-muted);
    font-size: 1rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

input[type="text"] {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 2px solid var(--color-secondary);
    border-radius: 12px;
    background: var(--color-surface);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition-speed);
}

input[type="text"]:focus {
    border-color: var(--color-primary);
}

input[type="text"]::placeholder {
    color: var(--color-text-muted);
}

/* Buttons */
.btn {
    display: block;
    width: 100%;
    padding: 16px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: transform var(--transition-speed), opacity var(--transition-speed);
    min-height: 48px;
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text);
}

.btn-secondary {
    background: var(--color-secondary);
    color: var(--color-text);
}

.btn-danger {
    background: transparent;
    border: 2px solid var(--color-danger);
    color: var(--color-danger);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-text-muted);
    color: var(--color-text-muted);
}

.button-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Stats Preview */
.stats-preview {
    margin-top: 32px;
    padding: 12px 16px;
    background: var(--color-surface);
    border-radius: 12px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.stat-divider {
    color: var(--color-secondary);
}

/* Player Colors */
.player1-color {
    color: var(--color-player1);
}

.player2-color {
    color: var(--color-player2);
}

/* Scoreboard */
.scoreboard {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    width: 100%;
    padding: 12px 16px;
    background: var(--color-surface);
    border-radius: 12px;
}

.player-score {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    flex: 1;
    padding: 8px;
    border-radius: 8px;
    transition: background var(--transition-speed);
}

.player-score.active {
    background: rgba(255, 255, 255, 0.1);
}

.score-name {
    font-size: 0.875rem;
    font-weight: 500;
}

.player1 .score-name {
    color: var(--color-player1);
}

.player2 .score-name {
    color: var(--color-player2);
}

.score-value {
    font-size: 2rem;
    font-weight: 700;
}

.player1 .score-value {
    color: var(--color-player1);
}

.player2 .score-value {
    color: var(--color-player2);
}

.vs {
    color: var(--color-text-muted);
    font-weight: 700;
    font-size: 0.875rem;
}

/* Turn Indicator */
.turn-indicator {
    padding: 10px 24px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 1rem;
    transition: background var(--transition-speed), color var(--transition-speed);
}

.turn-indicator.player1-turn {
    background: var(--color-player1);
    color: #1a1a2e;
    animation: pulse 1.5s ease-in-out infinite;
}

.turn-indicator.player2-turn {
    background: var(--color-player2);
    color: #1a1a2e;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Board */
.board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    width: 100%;
    max-width: 320px;
    aspect-ratio: 1;
    padding: 8px;
    background: var(--color-surface);
    border-radius: 16px;
}

/* Cards */
.card {
    position: relative;
    aspect-ratio: 1;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform var(--card-flip-speed);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.card.flipped {
    transform: rotateY(180deg);
}

.card.matched {
    opacity: 0.5;
    pointer-events: none;
}

.card.matched .card-front {
    background: var(--color-success);
}

.card.disabled {
    pointer-events: none;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.card-back {
    background: var(--color-card-back);
    border: 2px solid var(--color-secondary);
}

.card-back::after {
    content: '?';
    font-size: 1.5rem;
    color: var(--color-text-muted);
}

.card-front {
    background: var(--color-card-front);
    transform: rotateY(180deg);
    font-size: 2rem;
}

/* Finished Screen */
.result-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.result-message {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.final-score {
    font-size: 1.5rem;
    margin-bottom: 32px;
    color: var(--color-text-muted);
}

.final-score span {
    color: var(--color-text);
}

.score-divider {
    margin: 0 12px;
    color: var(--color-text-muted);
}

/* Animations */
@keyframes shake {
    0%, 100% { transform: rotateY(180deg) translateX(0); }
    25% { transform: rotateY(180deg) translateX(-5px); }
    75% { transform: rotateY(180deg) translateX(5px); }
}

.card.no-match {
    animation: shake 0.3s ease-in-out;
}

@keyframes pop {
    0% { transform: rotateY(180deg) scale(1); }
    50% { transform: rotateY(180deg) scale(1.1); }
    100% { transform: rotateY(180deg) scale(1); }
}

.card.match-found {
    animation: pop 0.3s ease-in-out;
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.score-value.updated {
    animation: bounce 0.3s ease-in-out;
}

/* Media Queries */
@media (min-width: 375px) {
    .board {
        gap: 10px;
        padding: 12px;
    }

    .card-front {
        font-size: 2.5rem;
    }
}

@media (min-width: 768px) {
    .screen {
        padding: 24px;
    }

    .container {
        max-width: 480px;
    }

    .board {
        max-width: 400px;
        gap: 12px;
    }

    .card-front {
        font-size: 3rem;
    }
}