/* =================================== */
/* BASE STYLES & RESET */
/* =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

html, body {
    height: 100%;
    overflow: hidden;
    background: #0f0c29;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    background: linear-gradient(135deg, #0f0c29, #24243e);
    display: flex;
    flex-direction: column;
    color: #ffffff;
    position: fixed;
    width: 100%;
    height: 100vh;
    height: 100dvh;
}

/* =================================== */
/* CSS VARIABLES & UTILITIES */
/* =================================== */
:root {
    /* Colors */
    --color-white-01: rgba(255, 255, 255, 0.1);
    --color-white-02: rgba(255, 255, 255, 0.2);
    --color-white-03: rgba(255, 255, 255, 0.3);
    --color-white-04: rgba(255, 255, 255, 0.4);
    --color-black-02: rgba(0, 0, 0, 0.2);
    --color-black-03: rgba(0, 0, 0, 0.3);
    --color-black-04: rgba(0, 0, 0, 0.4);
    --color-orange-03: rgba(255, 107, 107, 0.3);
    --color-orange-04: rgba(255, 107, 107, 0.4);
    --color-blue-03: rgba(102, 126, 234, 0.3);
    --color-blue-04: rgba(102, 126, 234, 0.4);
    
    /* Gradients */
    --gradient-orange: linear-gradient(145deg, #ff6b6b, #feca57);
    --gradient-blue: linear-gradient(145deg, #667eea, #764ba2);
    --gradient-orange-hover: linear-gradient(145deg, #ff7b7b, #ffd467);
    
    /* Shadows */
    --shadow-light: 0 4px 8px var(--color-black-02), inset 0 1px 0 var(--color-white-03), inset 0 -1px 0 var(--color-black-02);
    --shadow-medium: 0 10px 25px var(--color-orange-03), 0 4px 8px var(--color-black-02), inset 0 2px 0 var(--color-white-03), inset 0 -2px 0 var(--color-black-02);
    --shadow-deep: 0 15px 35px var(--color-orange-04), 0 6px 12px var(--color-black-03), inset 0 2px 0 var(--color-white-04), inset 0 -2px 0 var(--color-black-03);
    --shadow-blue-medium: 0 10px 25px var(--color-blue-03), 0 4px 8px var(--color-black-02), inset 0 2px 0 var(--color-white-03), inset 0 -2px 0 var(--color-black-02);
    --shadow-blue-deep: 0 15px 35px var(--color-blue-04), 0 6px 12px var(--color-black-03), inset 0 2px 0 var(--color-white-04), inset 0 -2px 0 var(--color-black-03);
    --shadow-hover: 0 3px 15px var(--color-blue-04);
    --shadow-card: 0 20px 40px var(--color-black-03);
}

/* Utility Classes */
.glass-light { background: var(--color-white-01); backdrop-filter: blur(10px); border: 1px solid var(--color-white-02); }
.glass-medium { background: rgba(36, 36, 62, 0.8); backdrop-filter: blur(10px); border: 1px solid var(--color-white-01); }

.btn-gradient-orange { background: var(--gradient-orange); }
.btn-gradient-blue { background: var(--gradient-blue); }
.btn-3d-orange { box-shadow: var(--shadow-medium); }
.btn-3d-blue { box-shadow: var(--shadow-blue-medium); }

/* Shadow Utilities */
.shadow-light { box-shadow: var(--shadow-light); }
.shadow-medium { box-shadow: var(--shadow-medium); }
.shadow-deep { box-shadow: var(--shadow-deep); }
.shadow-hover { box-shadow: var(--shadow-hover); }
.shadow-card { box-shadow: var(--shadow-card); }

/* Button Components */
.btn-primary {
    background: var(--gradient-orange);
    color: #0f0c29;
    border: none;
    border-radius: 25px;
    padding: 15px 40px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    background: var(--gradient-orange-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-deep);
}

.btn-secondary {
    background: var(--gradient-blue);
    color: #ffffff;
    border: none;
    border-radius: 25px;
    padding: 10px 20px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-blue-medium);
}

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-blue-deep);
}

/* Card Components */
.card-glass {
    background: rgba(36, 36, 62, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-white-01);
    border-radius: 15px;
    padding: 20px;
    box-shadow: var(--shadow-card);
}

/* =================================== */
/* MATRIX RAIN BACKGROUND */
/* =================================== */
.matrix-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    opacity: 1.0;
    contain: layout style paint; /* Performance isolation */
}

.matrix-box {
    position: absolute;
    width: 30px;
    height: 30px;
    border-radius: 6px;
    animation: matrixFall linear infinite;
    will-change: transform;
    transform: translateZ(0); /* Hardware acceleration */
    backface-visibility: hidden; /* Smoother animation */
}

.matrix-box::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 6px;
    background: linear-gradient(135deg, #ff6b6b, #feca57);
    box-shadow: 
        inset -1px -1px 3px var(--color-black-03),
        inset 1px 1px 3px var(--color-white-03),
        0 2px 8px var(--color-orange-04);
    border: 1px solid rgba(255, 202, 87, 0.6);
}

.matrix-box.shade-1::before { opacity: 0.9; }
.matrix-box.shade-2::before { opacity: 0.8; background: linear-gradient(135deg, #feca57, #ff6b6b); }
.matrix-box.shade-3::before { opacity: 0.7; background: linear-gradient(135deg, #ff8c94, #ffeaa7); }


@keyframes matrixBlink {
    0%, 100% {
        background: linear-gradient(135deg, #ff6b6b, #feca57);
        box-shadow: 
            inset -1px -1px 3px var(--color-black-03),
            inset 1px 1px 3px var(--color-white-03),
            0 2px 8px var(--color-orange-04);
    }
    50% {
        background: linear-gradient(135deg, #00b894, #00cec9);
        box-shadow: 
            inset -1px -1px 3px var(--color-black-03),
            inset 1px 1px 3px rgba(255, 255, 255, 0.5),
            0 0 15px rgba(0, 184, 148, 0.6),
            0 0 25px rgba(0, 206, 201, 0.4);
    }
}

@keyframes matrixFall {
    from {
        transform: translateY(-40px);
        opacity: 1;
    }
    to {
        transform: translateY(110vh);
        opacity: 0;
    }
}

/* Desktop wrapper */
@media (min-width: 768px) {
    body {
        position: relative;
        overflow-y: auto;
    }
    
    .app-container {
        max-width: 600px;
        margin: 0 auto;
        min-height: 100vh;
        box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
        background: linear-gradient(135deg, #0f0c29, #24243e);
    }
}

/* =================================== */
/* MAIN LAYOUT */
/* =================================== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    overflow: hidden;
    position: relative;
    z-index: 10;
}

/* =================================== */
/* HEADER SECTION */
/* =================================== */
.header {
    padding-top: env(safe-area-inset-top, 20px);
    padding-left: 15px;
    padding-right: 15px;
    padding-bottom: 10px;
    text-align: center;
    background: rgba(36, 36, 62, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-white-01);
    flex-shrink: 0;
}

.header h1 {
    font-size: 22px;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.player-selector {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 10px;
}

.player-btn {
    padding: 6px 15px;
    border: 2px solid var(--color-white-02);
    background: var(--color-white-01);
    color: white;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
    font-size: 12px;
}

.player-btn:not(.active) {
    box-shadow: 
        0 6px 15px var(--color-white-02),
        0 2px 4px var(--color-black-02),
        inset 0 2px 0 var(--color-white-03),
        inset 0 -2px 0 var(--color-black-02);
}

.player-btn:not(.active):hover {
    transform: translateY(-2px);
    box-shadow: 
        0 8px 20px var(--color-white-03),
        0 3px 6px var(--color-black-03),
        inset 0 2px 0 var(--color-white-04),
        inset 0 -2px 0 var(--color-black-03);
}

.player-btn.active {
    background: var(--color-white-01);
    border-color: transparent;
    transform: scale(1.05);
    box-shadow: 
        0 8px 20px var(--color-white-04),
        0 3px 6px var(--color-black-03),
        inset 0 2px 0 var(--color-white-04),
        inset 0 -2px 0 var(--color-black-02);
}

.score-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.player-score {
    background: var(--color-white-01);
    padding: 8px 12px;
    border-radius: 10px;
    min-width: 90px;
    text-align: center;
    border: 1px solid var(--color-white-02);
    transition: all 0.3s;
    box-shadow: 
        0 6px 15px var(--color-white-02),
        0 2px 4px var(--color-black-02),
        inset 0 2px 0 var(--color-white-03),
        inset 0 -2px 0 var(--color-black-02);
}

.player-score.current-turn {
    background: var(--color-white-01);
    transform: scale(1.05);
    box-shadow: 
        0 12px 30px var(--color-blue-04),
        0 8px 20px var(--color-white-04),
        0 5px 10px var(--color-black-03),
        inset 0 3px 0 var(--color-white-04),
        inset 0 -2px 0 var(--color-black-02);
}

.player-score .name {
    font-size: 10px;
    opacity: 0.8;
    margin-bottom: 2px;
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
    transition: all 0.3s;
}

.player-score .name:hover {
    opacity: 1;
    background: var(--color-white-01);
}

.player-score .name.editing {
    background: var(--color-white-02);
    outline: 2px solid #feca57;
}

.name-input {
    background: transparent;
    border: none;
    color: inherit;
    font-size: inherit;
    font-family: inherit;
    font-weight: inherit;
    text-align: center;
    width: 100%;
    outline: none;
}

.player-score .stats {
    display: flex;
    justify-content: space-around;
    gap: 8px;
}

.player-score .stat {
    text-align: center;
}

.player-score .stat-value {
    font-size: 14px;
    font-weight: bold;
    color: #feca57;
}

.player-score .stat-label {
    font-size: 8px;
    opacity: 0.7;
    text-transform: uppercase;
}

/* Game area */
.game-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 10px 15px;
    overflow: hidden;
}

.controls {
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
    flex-shrink: 0;
    gap: 12px;
}

.toggle-container {
    background: rgba(36, 36, 62, 0.8);
    padding: 4px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--color-white-02);
    max-width: 80%;
    width: fit-content;
}

.toggle-label {
    font-size: 12px;
    padding: 0 8px;
    opacity: 0.8;
}

.toggle-switch {
    position: relative;
    width: 40px;
    height: 22px;
    background: var(--color-white-02);
    border-radius: 11px;
    cursor: pointer;
    transition: background 0.3s;
}

.toggle-switch.active {
    background: linear-gradient(45deg, #ff6b6b, #feca57);
}

.toggle-switch.always-active {
    background: linear-gradient(45deg, #ff6b6b, #feca57);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform 0.3s;
}

.toggle-switch.active::after {
    transform: translateX(18px);
}

/* Word display section */
/* Timer progress bar */
.timer-container {
    width: 100%;
    margin-bottom: 15px;
    position: relative;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.timer-container.active {
    opacity: 1;
}

.timer-background {
    width: 100%;
    height: 8px;
    background: var(--color-white-01);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--color-white-02);
}

.timer-progress {
    height: 100%;
    background: linear-gradient(45deg, #ff6b6b, #feca57, #ff6b6b);
    background-size: 200% 100%;
    border-radius: 4px;
    width: 100%;
    transition: transform 0.2s ease; /* Width transition set dynamically by JavaScript */
    animation: timerPulse 2.1s infinite, timerShimmer 3s infinite;
    will-change: width;
    transform: translateZ(0); /* Hardware acceleration */
}

@keyframes timerPulse {
    0%, 100% { 
        box-shadow: 0 0 5px rgba(255, 107, 107, 0.5);
        background-position: 0% 50%;
    }
    50% { 
        box-shadow: 0 0 15px rgba(254, 202, 87, 0.8);
        background-position: 100% 50%;
    }
}

@keyframes timerShimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.timer-bonus {
    position: absolute;
    right: 0;
    top: -25px;
    color: #feca57;
    font-size: 14px;
    font-weight: 600;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.2s ease, color 0.2s ease;
    text-shadow: 0 0 8px rgba(254, 202, 87, 0.5);
    will-change: transform, opacity;
    transform: translateZ(0); /* Hardware acceleration */
}

.timer-bonus.show {
    opacity: 1;
}

.word-display {
    background: rgba(36, 36, 62, 0.8);
    padding: 15px;
    border-radius: 15px;
    margin-bottom: 10px;
    border: 1px solid var(--color-white-01);
    backdrop-filter: blur(10px);
    flex-shrink: 0;
}

.letter-container {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 15px;
    flex-wrap: wrap;
    min-height: 45px;
}

.letter-box {
    width: 32px;
    height: 40px;
    background: var(--color-white-01);
    border: 2px solid var(--color-white-02);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    transition: all 0.3s ease;
}

.letter-box.revealed {
    background: var(--gradient-orange);
    border-color: transparent;
    color: #0f0c29;
    transform: scale(1.1);
    box-shadow: 
        0 6px 15px var(--color-orange-04),
        0 2px 4px var(--color-black-02),
        inset 0 1px 0 var(--color-white-04),
        inset 0 -1px 0 rgba(255, 107, 107, 0.5);
}

.letter-box.guessed {
    background: var(--gradient-blue);
    border-color: transparent;
    color: #0f0c29;
    animation: popIn 0.3s ease;
    transform: scale(1.1);
    box-shadow: 
        0 6px 15px rgba(72, 219, 251, 0.4),
        0 2px 4px var(--color-black-02),
        inset 0 1px 0 var(--color-white-04),
        inset 0 -1px 0 rgba(10, 189, 227, 0.5);
}

@keyframes popIn {
    0% { transform: scale(0.8); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1.1); }
}

.letter-box.empty {
    background: rgba(255, 255, 255, 0.05);
    border-style: dashed;
    border-color: var(--color-white-03);
}

.button-container {
    display: flex;
    gap: 8px;
}

.game-button {
    flex: 1;
    padding: 10px;
    font-size: 13px;
    border: 2px solid;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
    background: transparent;
}

.help-button { border-color: #48dbfb; color: #48dbfb; background: rgba(72, 219, 251, 0.1); }
.skip-button { border-color: #ff9f43; color: #ff9f43; background: rgba(255, 159, 67, 0.1); }
.submit-button { border-color: #00b894; color: #00b894; background: rgba(0, 184, 148, 0.1); }

.help-button:hover:not(:disabled) { background: #48dbfb; box-shadow: 0 5px 20px rgba(72, 219, 251, 0.4); }
.skip-button:hover:not(:disabled) { background: #ff9f43; box-shadow: 0 5px 20px rgba(255, 159, 67, 0.4); }
.submit-button:hover:not(:disabled) { background: #00b894; box-shadow: 0 5px 20px rgba(0, 184, 148, 0.4); }

.help-button:hover:not(:disabled), .skip-button:hover:not(:disabled), .submit-button:hover:not(:disabled) {
    color: #0f0c29;
    transform: translateY(-2px);
}

.game-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Message area */
.message {
    text-align: center;
    font-size: 14px;
    margin: 10px 0;
    min-height: 20px;
    font-weight: 500;
    flex-shrink: 0;
}

.message.success {
    color: #0be881;
    text-shadow: 0 0 15px rgba(11, 232, 129, 0.5);
}

.message.error {
    color: #ee5a6f;
    text-shadow: 0 0 15px rgba(238, 90, 111, 0.5);
}

/* Keyboard */
.keyboard {
    background: rgba(36, 36, 62, 0.8);
    padding: 8px 6px;
    padding-bottom: calc(env(safe-area-inset-bottom, 15px) + 6px);
    border-top: 1px solid var(--color-white-01);
    backdrop-filter: blur(10px);
    flex-shrink: 0;
    display: block;
}

/* Desktop-only buttons */
.keyboard-toggle, .readme-button {
    display: none;
}

@media (min-width: 768px) {
    .keyboard-toggle {
        display: block;
        position: fixed;
        bottom: 50px;
        right: 20px;
        background: var(--gradient-blue);
        color: #ffffff;
        border: none;
        padding: 10px 15px;
        border-radius: 25px;
        cursor: pointer;
        z-index: 100;
        box-shadow: 
            0 10px 25px var(--color-blue-03),
            0 4px 8px var(--color-black-02),
            inset 0 2px 0 var(--color-white-03),
            inset 0 -2px 0 var(--color-black-02);
        transition: all 0.3s ease;
    }
    
    .keyboard-toggle:hover {
        transform: translateY(-3px);
        box-shadow: 
            0 15px 35px var(--color-blue-04),
            0 6px 12px var(--color-black-03),
            inset 0 2px 0 var(--color-white-04),
            inset 0 -2px 0 var(--color-black-03);
    }
    
    .keyboard-toggle:active {
        transform: translateY(-1px);
        box-shadow: 
            0 8px 20px var(--color-blue-03),
            0 2px 4px var(--color-black-02),
            inset 0 2px 0 var(--color-white-02),
            inset 0 -2px 0 var(--color-black-04);
    }

    .readme-button {
        display: block;
        position: fixed;
        bottom: 95px;
        right: 20px;
        background: var(--gradient-blue);
        color: #ffffff;
        border: none;
        padding: 10px 15px;
        border-radius: 25px;
        cursor: pointer;
        z-index: 100;
        text-decoration: none;
        text-align: center;
        font-size: 14px;
        font-weight: 500;
        font-family: inherit;
        box-shadow: 
            0 10px 25px var(--color-blue-03),
            0 4px 8px var(--color-black-02),
            inset 0 2px 0 var(--color-white-03),
            inset 0 -2px 0 var(--color-black-02);
        transition: all 0.3s ease;
    }
    
    .readme-button:hover {
        transform: translateY(-3px);
        box-shadow: 
            0 15px 35px var(--color-blue-04),
            0 6px 12px var(--color-black-03),
            inset 0 2px 0 var(--color-white-04),
            inset 0 -2px 0 var(--color-black-03);
    }
    
    .readme-button:active {
        transform: translateY(-1px);
        box-shadow: 
            0 8px 20px var(--color-blue-03),
            0 2px 4px var(--color-black-02),
            inset 0 2px 0 var(--color-white-02),
            inset 0 -2px 0 var(--color-black-04);
    }
}

@media (min-width: 768px) {
    .keyboard {
        display: none;
    }
    
    .keyboard.visible {
        display: block;
    }
}

/* Vibecoded attribution */
.vibecoded-note {
    position: fixed;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 24px;
    color: rgba(255, 255, 255, 0.7);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    z-index: 20;
    pointer-events: none;
    user-select: none;
}

@media (max-width: 767px) {
    .vibecoded-note {
        bottom: 150px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
        font-size: 17px;
    }
    
    /* PWA specific adjustment */
    @media (display-mode: standalone) {
        .vibecoded-note {
            bottom: 221px;
        }
        
        .readme-button {
            bottom: 240px;
        }
    }
    
    .keyboard-toggle {
        display: none !important;
    }
    
    .readme-button {
        display: block;
        position: fixed;
        bottom: 180px;
        left: 50%;
        transform: translateX(-50%);
        background: var(--gradient-blue);
        color: #ffffff;
        border: none;
        padding: 8px 20px;
        border-radius: 20px;
        cursor: pointer;
        z-index: 100;
        text-decoration: none;
        text-align: center;
        font-size: 14px;
        font-weight: 500;
        font-family: inherit;
        box-shadow: 
            0 10px 25px var(--color-blue-03),
            0 4px 8px var(--color-black-02),
            inset 0 2px 0 var(--color-white-03),
            inset 0 -2px 0 var(--color-black-02);
        transition: all 0.3s ease;
    }
    
    .readme-button:hover {
        transform: translateX(-50%) translateY(-3px);
        box-shadow: 
            0 15px 35px var(--color-blue-04),
            0 6px 12px var(--color-black-03),
            inset 0 2px 0 var(--color-white-04),
            inset 0 -2px 0 var(--color-black-03);
    }
    
    .readme-button:active {
        transform: translateX(-50%) translateY(-1px);
        box-shadow: 
            0 8px 20px var(--color-blue-03),
            0 2px 4px var(--color-black-02),
            inset 0 2px 0 var(--color-white-02),
            inset 0 -2px 0 var(--color-black-04);
    }
    
    .keyboard {
        display: block !important;
    }
    
    .timer-bonus {
        top: 35px;
        right: 0;
    }
}

.keyboard-row {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: 6px;
}

.keyboard-row:last-child {
    margin-bottom: 0;
}

.key {
    min-width: 28px;
    height: 38px;
    background: var(--color-white-01);
    border: 2px solid var(--color-white-02);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: #ffffff;
    cursor: pointer;
    transition: all 0.1s;
    box-shadow: 0 2px 4px var(--color-black-03);
}

.key:active:not(.disabled) {
    transform: translateY(1px);
    box-shadow: 0 1px 2px var(--color-black-03);
    background: var(--color-white-02);
}

.key.special {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    min-width: 45px;
    font-size: 11px;
    border-color: transparent;
}

.key.disabled {
    background: rgba(255, 255, 255, 0.05);
    cursor: not-allowed;
    opacity: 0.3;
    color: var(--color-white-03);
}

/* Desktop styles */
@media (min-width: 768px) {
    .header {
        padding: 30px 20px 20px;
    }
    
    /* Smaller keyboard on desktop to avoid overlap */
    .keyboard {
        padding: 15px;
    }
    
    .keyboard-row {
        gap: 3px;
        margin-bottom: 4px;
    }
    
    .key {
        min-width: 24px;
        height: 32px;
        font-size: 12px;
    }
    
    .key.special {
        min-width: 36px;
        font-size: 10px;
    }

    .header h1 {
        font-size: 32px;
        margin-bottom: 20px;
    }

    .player-selector {
        gap: 12px;
        margin-bottom: 20px;
    }

    .player-btn {
        padding: 10px 25px;
        font-size: 16px;
        border-radius: 25px;
    }

    .score-container {
        gap: 20px;
    }

    .player-score {
        padding: 12px 20px;
        min-width: 130px;
    }

    .player-score .name {
        font-size: 14px;
        margin-bottom: 8px;
        padding: 4px 8px;
    }

    .player-score .stat-value {
        font-size: 20px;
    }

    .player-score .stat-label {
        font-size: 11px;
    }

    .game-area {
        padding: 30px;
    }

    .controls {
        margin-bottom: 25px;
    }

    .toggle-container {
        padding: 8px;
        max-width: 80%;
        width: fit-content;
    }

    .toggle-label {
        font-size: 16px;
        padding: 0 12px;
    }

    .toggle-switch {
        width: 60px;
        height: 30px;
    }

    .toggle-switch::after {
        width: 26px;
        height: 26px;
    }

    .toggle-switch.active::after {
        transform: translateX(30px);
    }

    .word-display {
        padding: 30px;
        margin-bottom: 25px;
        border-radius: 20px;
    }

    .letter-container {
        gap: 10px;
        margin-bottom: 30px;
        min-height: 60px;
    }

    .letter-box {
        width: 50px;
        height: 60px;
        font-size: 28px;
        border-radius: 12px;
    }

    .button-container {
        gap: 12px;
    }

    .game-button {
        padding: 15px;
        font-size: 18px;
        border-radius: 12px;
    }

    .message {
        font-size: 20px;
        margin: 20px 0;
    }

}

/* Tablet adjustments */
@media (min-width: 768px) and (max-width: 1024px) {
    .letter-box {
        width: 45px;
        height: 55px;
        font-size: 24px;
    }

    .key {
        min-width: 40px;
        height: 50px;
        font-size: 18px;
    }
}

/* Large desktop */
@media (min-width: 1024px) {
    .app-container {
        max-width: 700px;
    }

    .game-area {
        padding: 40px;
    }

    .keyboard {
        padding: 30px;
    }
}

/* Mobile height adjustments */
@media (max-height: 700px) and (max-width: 767px) {
    .header h1 { font-size: 18px; margin-bottom: 8px; }
    .player-btn { padding: 5px 12px; font-size: 11px; }
    .player-score { padding: 6px 10px; min-width: 80px; }
    .player-score .stat-value { font-size: 12px; }
    .letter-box { width: 28px; height: 36px; font-size: 16px; }
    .game-button { padding: 8px; font-size: 12px; }
    .key { min-width: 26px; height: 35px; font-size: 13px; }
    .key.special { min-width: 42px; font-size: 10px; }
    .keyboard { padding: 10px 8px; }
}

@media (max-height: 600px) and (max-width: 767px) {
    .controls { display: none; }
    .message { margin: 5px 0; font-size: 12px; }
    .keyboard-row { margin-bottom: 4px; }
}

/* Mobile-specific game end screen improvements */
@media (max-width: 768px) {
    .game-end-content {
        padding: 15px 10px 40px 10px; /* Extra bottom padding */
        margin: 10px auto 60px auto; /* Extra bottom margin for button accessibility */
        max-height: none !important;
        min-height: auto !important;
        height: auto !important;
        width: 95%;
        border-radius: 15px;
        overflow-y: visible;
    }
    
    .game-end-screen {
        padding: 5px 0 120px 0; /* Extra bottom padding for mobile browser bars */
        -webkit-overflow-scrolling: touch;
        touch-action: pan-y;
        overscroll-behavior: contain;
        align-items: flex-start !important;
        overflow-y: auto !important;
        height: 100vh !important;
        min-height: 100vh; /* Ensure full height on mobile */
    }
    
    /* Ensure leaderboard is also touch scrollable */
    .leaderboard-list {
        -webkit-overflow-scrolling: touch;
        touch-action: pan-y;
        max-height: 200px;
    }
    
    /* Ensure submit buttons are accessible */
    .leaderboard-submit {
        margin: 15px 0;
        padding: 15px;
    }
    
    /* Mobile-specific button positioning */
    .submit-score-btn {
        padding: 12px 20px !important;
        margin: 8px 0 !important;
        font-size: 14px !important;
    }
}

/* Mobile leaderboard improvements */
@media (max-width: 768px) {
    .leaderboard-header {
        grid-template-columns: 30px 1fr 40px 50px auto !important;
        gap: 6px !important;
        padding: 6px 8px !important;
        font-size: 0.8rem !important;
    }

    .leaderboard-entry {
        grid-template-columns: 30px 1fr 40px 50px auto !important;
        gap: 6px !important;
        padding: 6px 8px !important;
        font-size: 0.8rem !important;
    }

    .leaderboard-score {
        font-size: 0.9rem !important;
        word-break: break-all !important;
        overflow-wrap: anywhere !important;
    }
}

/* Additional mobile viewport fix */
@media (max-width: 480px) {
    .game-end-content {
        padding: 10px 8px 50px 8px !important; /* Extra bottom padding for small screens */
        margin: 5px auto 80px auto !important; /* Extra bottom margin */
        max-height: none !important;
        width: 98% !important;
    }
    
    .leaderboard-list {
        max-height: 150px !important;
    }
    
    .leaderboard-header {
        grid-template-columns: 25px 1fr 35px 40px minmax(80px, auto) !important;
        gap: 4px !important;
        padding: 6px 4px !important;
        font-size: 0.7rem !important;
    }

    .leaderboard-entry {
        grid-template-columns: 25px 1fr 35px 40px minmax(80px, auto) !important;
        gap: 4px !important;
        padding: 6px 4px !important;
        font-size: 0.7rem !important;
    }

    .leaderboard-score {
        font-size: 0.8rem !important;
    }
    
    /* Ensure continue button is always accessible on small screens */
    .continue-button {
        margin-top: 30px !important;
        margin-bottom: 20px !important;
        position: relative;
        z-index: 10;
    }
}

/* Game end screen */
.game-end-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Modern viewport units for mobile browsers with dynamic UI */
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height - accounts for browser bars */
    background: rgba(15, 12, 41, 0.95);
    backdrop-filter: blur(10px);
    display: none;
    justify-content: center;
    align-items: flex-start;
    z-index: 2000;
    animation: fadeIn 0.5s ease;
    overflow-y: auto;
    padding: 20px 0 100px 0; /* Extra bottom padding for mobile safety */
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
}

.game-end-content {
    background: rgba(36, 36, 62, 0.95);
    padding: 40px 40px 90px 40px;
    border-radius: 20px;
    border: 2px solid var(--color-white-02);
    text-align: center;
    max-width: 600px;
    width: 90%;
    max-height: none;
    overflow-y: visible;
    backdrop-filter: blur(10px);
    box-shadow: 0 20px 40px var(--color-black-03);
    margin: 20px auto;
    -webkit-overflow-scrolling: touch;
}

/* Leaderboard styles */
.leaderboard-section {
    margin: 30px 0;
    text-align: left;
}

.leaderboard-title {
    font-size: 1.5rem;
    color: #feca57;
    text-align: center;
    margin-bottom: 20px;
    font-weight: 600;
}

.leaderboard-submit {
    background: var(--color-white-01);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--color-white-02);
}

.name-input {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--color-white-03);
    border-radius: 8px;
    background: var(--color-white-01);
    color: white;
    font-size: 16px;
    margin-bottom: 15px;
    text-align: center;
}

.name-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.name-input:focus {
    outline: none;
    border-color: #feca57;
    background: rgba(255, 255, 255, 0.15);
}

.submit-score-btn {
    background: linear-gradient(45deg, #48dbfb, #0abde3);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.submit-score-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(72, 219, 251, 0.4);
}

.submit-score-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* New leaderboard UI styles */
.leaderboard-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    gap: 10px;
}

.tab-btn {
    background: var(--color-white-01);
    border: 1px solid var(--color-white-02);
    color: rgba(255, 255, 255, 0.7);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: rgba(254, 202, 87, 0.2);
    border-color: rgba(254, 202, 87, 0.5);
    color: #feca57;
}

.submit-options {
    display: flex;
    gap: 10px;
}

.submit-score-btn.local {
    background: linear-gradient(45deg, #54a0ff, #2e86de);
    flex: 1;
}

.submit-score-btn.global {
    background: linear-gradient(45deg, #5f27cd, #341f97);
    flex: 1;
}

.submit-score-btn.local:hover:not(:disabled) {
    box-shadow: 0 5px 15px rgba(84, 160, 255, 0.4);
}

.submit-score-btn.global:hover:not(:disabled) {
    box-shadow: 0 5px 15px rgba(95, 39, 205, 0.4);
}

.submit-score-btn.ineligible {
    background: #666 !important;
    cursor: not-allowed;
    opacity: 0.5;
    box-shadow: none !important;
}

.submit-score-btn.ineligible:hover {
    box-shadow: none !important;
}

.eligibility-notice {
    padding: 12px;
    margin: 10px 0;
    border-radius: 8px;
    font-size: 13px;
    text-align: center;
    line-height: 1.4;
    border: 1px solid;
}

.eligibility-notice.qualified {
    background: rgba(76, 175, 80, 0.15);
    border-color: #4CAF50;
    color: #81C784;
}

.eligibility-notice.not-qualified {
    background: rgba(244, 67, 54, 0.15);
    border-color: #f44336;
    color: #ffab91;
}

.eligibility-notice.loading {
    background: rgba(255, 193, 7, 0.15);
    border-color: #FFC107;
    color: #FFD54F;
}

.privacy-note {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
    margin-top: 10px;
    line-height: 1.3;
}

.leaderboard-list {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 15px;
    border: 1px solid var(--color-white-01);
    max-height: 300px;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.leaderboard-list::-webkit-scrollbar {
    width: 6px;
}

.leaderboard-list::-webkit-scrollbar-track {
    background: var(--color-white-01);
    border-radius: 3px;
}

.leaderboard-list::-webkit-scrollbar-thumb {
    background: rgba(254, 202, 87, 0.5);
    border-radius: 3px;
}

.leaderboard-list::-webkit-scrollbar-thumb:hover {
    background: rgba(254, 202, 87, 0.7);
}

.leaderboard-header {
    display: grid;
    grid-template-columns: 40px 1fr 40px 50px 80px;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    margin-bottom: 8px;
    font-size: 12px;
    font-weight: bold;
    color: rgba(255, 255, 255, 0.8);
    background: var(--color-black-03);
    border-radius: 6px;
    border-bottom: 2px solid rgba(254, 202, 87, 0.3);
}

.leaderboard-entry {
    display: grid;
    grid-template-columns: 40px 1fr 40px 50px 80px;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    margin-bottom: 5px;
    border-radius: 6px;
    font-size: 14px;
}

.leaderboard-entry:last-child {
    margin-bottom: 0;
}

.leaderboard-entry.current-player {
    background: rgba(254, 202, 87, 0.3);
    border: 2px solid rgba(254, 202, 87, 0.8);
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(254, 202, 87, 0.3);
}

.leaderboard-entry.rank-1 { background: rgba(255, 215, 0, 0.2); border: 1px solid rgba(255, 215, 0, 0.4); }
.leaderboard-entry.rank-2 { background: rgba(192, 192, 192, 0.2); border: 1px solid rgba(192, 192, 192, 0.4); }
.leaderboard-entry.rank-3 { background: rgba(205, 127, 50, 0.2); border: 1px solid rgba(205, 127, 50, 0.4); }

.leaderboard-rank {
    font-weight: bold;
    color: #feca57;
    min-width: 30px;
}

.leaderboard-game-length {
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
    text-align: center;
}

.leaderboard-game-time {
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
    text-align: center;
}


.leaderboard-name {
    flex-grow: 1;
    text-align: left;
    margin-left: 10px;
    color: white;
}

.leaderboard-score {
    color: #48dbfb;
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

.rank-status {
    text-align: center;
    margin: 15px 0;
    font-size: 14px;
}

.rank-status.made-leaderboard {
    color: #feca57;
    font-weight: 600;
}

.rank-status.no-leaderboard {
    color: rgba(255, 255, 255, 0.7);
}

.game-end-title {
    font-size: 2.5rem;
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    font-weight: 700;
}

.winner-name {
    font-size: 1.8rem;
    color: #feca57;
    margin-bottom: 30px;
    font-weight: 600;
}

.final-stats {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-bottom: 30px;
}

.player-final-stats {
    background: var(--color-white-01);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--color-white-02);
}

.stat-card {
    background: var(--color-white-01);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--color-white-02);
}

.stat-card.large-score {
    margin-bottom: 15px;
    text-align: center;
}

.stat-card.large-score .stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: #feca57;
    margin-bottom: 8px;
}

.small-stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.stat-card.small {
    padding: 12px;
    text-align: center;
}

.stat-card.small .stat-value {
    font-size: 1.2rem;
    font-weight: bold;
    color: #48dbfb;
    margin-bottom: 3px;
}

.stat-card.small .stat-label {
    font-size: 0.75rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: #48dbfb;
    margin-bottom: 5px;
}

.stat-card .stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.continue-button {
    background: var(--gradient-orange);
    color: #0f0c29;
    border: none;
    padding: 15px 40px;
    border-radius: 25px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 
        0 10px 25px var(--color-orange-03),
        0 4px 8px var(--color-black-02),
        inset 0 2px 0 var(--color-white-03),
        inset 0 -2px 0 var(--color-black-02);
    transition: all 0.3s ease;
}

.continue-button:hover {
    transform: translateY(-3px);
    background: var(--gradient-orange-hover);
    box-shadow: 
        0 15px 35px var(--color-orange-04),
        0 6px 12px var(--color-black-03),
        inset 0 2px 0 var(--color-white-04),
        inset 0 -2px 0 var(--color-black-03);
}

.continue-button:active {
    transform: translateY(-1px);
    box-shadow: 
        0 8px 20px var(--color-orange-03),
        0 2px 4px var(--color-black-02),
        inset 0 2px 0 var(--color-white-02),
        inset 0 -2px 0 var(--color-black-04);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Install prompt */
.install-prompt {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    max-width: 560px;
    margin: 0 auto;
    background: rgba(36, 36, 62, 0.95);
    padding: 12px;
    border-radius: 12px;
    border: 2px solid var(--color-white-02);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: none;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(100px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.install-prompt h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: #feca57;
}

.install-prompt p {
    font-size: 12px;
    margin-bottom: 12px;
    opacity: 0.9;
}

.install-buttons {
    display: flex;
    gap: 8px;
}

.install-btn {
    flex: 1;
    padding: 8px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s;
}

.install-btn.primary {
    background: var(--gradient-orange);
    color: #0f0c29;
    box-shadow: 
        0 4px 12px var(--color-orange-03),
        0 2px 4px var(--color-black-02),
        inset 0 1px 0 var(--color-white-03),
        inset 0 -1px 0 var(--color-black-02);
}

.install-btn.primary:hover {
    transform: translateY(-2px);
    background: var(--gradient-orange-hover);
    box-shadow: 
        0 6px 16px var(--color-orange-04),
        0 3px 6px var(--color-black-03),
        inset 0 1px 0 var(--color-white-04),
        inset 0 -1px 0 var(--color-black-03);
}

.install-btn.primary:active {
    transform: translateY(-1px);
    box-shadow: 
        0 3px 8px var(--color-orange-03),
        0 1px 2px var(--color-black-02),
        inset 0 1px 0 var(--color-white-02),
        inset 0 -1px 0 var(--color-black-04);
}

.install-btn.secondary {
    background: var(--color-white-01);
    color: white;
    border: 1px solid var(--color-white-02);
}

@media (min-width: 768px) {
    .install-prompt {
        padding: 20px;
        border-radius: 16px;
    }

    .install-prompt h3 {
        font-size: 20px;
        margin-bottom: 12px;
    }

    .install-prompt p {
        font-size: 16px;
        margin-bottom: 20px;
    }

    .install-btn {
        padding: 12px;
        font-size: 16px;
        border-radius: 8px;
    }
}

/* 3D Button Effects - Shared styles for consistent button appearance */
.btn-3d {
    box-shadow: 
        0 10px 25px var(--color-orange-03),
        0 4px 8px var(--color-black-02),
        inset 0 2px 0 var(--color-white-03),
        inset 0 -2px 0 var(--color-black-02);
    transition: all 0.3s ease;
}

.btn-3d:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 15px 35px var(--color-orange-04),
        0 6px 12px var(--color-black-03),
        inset 0 2px 0 var(--color-white-04),
        inset 0 -2px 0 var(--color-black-03);
}

.btn-3d:active {
    transform: translateY(-1px);
    box-shadow: 
        0 8px 20px var(--color-orange-03),
        0 2px 4px var(--color-black-02),
        inset 0 2px 0 var(--color-white-02),
        inset 0 -2px 0 var(--color-black-04);
}

/* Social sharing section styles */
.social-share-section {
    margin-top: 20px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: fadeInUp 0.5s ease-out;
}

.social-share-section h4 {
    text-align: center;
    color: #feca57;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.share-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.share-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.x-share {
    background: linear-gradient(135deg, #1da1f2 0%, #0d8bd9 100%);
}

.x-share:hover {
    box-shadow: 0 4px 12px rgba(29, 161, 242, 0.4);
}

.nostr-web {
    background: linear-gradient(135deg, #ff6b35 0%, #f7931a 100%);
}

.nostr-web:hover {
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
}

.nostr-native {
    background: linear-gradient(135deg, #f7931a 0%, #ff6b35 100%);
}

.nostr-native:hover {
    box-shadow: 0 4px 12px rgba(247, 147, 26, 0.4);
}

.download {
    background: linear-gradient(135deg, #4ecdc4 0%, #44a08d 100%);
}

.download:hover {
    box-shadow: 0 4px 12px rgba(78, 205, 196, 0.4);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Toast notification animations */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}