*, *::before, *::after { 
    box-sizing: border-box; 
}

body { 
    background: #020617; 
    color: #fff; 
    font-family: 'Inter', sans-serif; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    min-height: 100vh; 
    margin: 0; 
    text-align: center; 
    overflow: hidden; 
    user-select: none; 
}

#particles { 
    position: fixed; 
    inset: 0; 
    z-index: 0; 
    pointer-events: none; 
}

.bg-glow { 
    position: fixed; 
    inset: 0; 
    background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(30, 58, 138, 0.27) 0%, transparent 70%); 
    z-index: 0; 
    pointer-events: none; 
}

.back-home { 
    position: fixed; 
    top: 20px; 
    left: 24px; 
    font-size: 0.85rem; 
    color: #475569; 
    text-decoration: none; 
    transition: color 0.2s; 
    z-index: 10; 
}

.back-home:hover { 
    color: #fff; 
}

.container { 
    position: relative; 
    z-index: 1; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    padding: 40px 24px; 
    max-width: 560px; 
    width: 100%; 
}

h1 { 
    font-family: 'Syne', sans-serif; 
    font-size: clamp(2rem, 8vw, 3rem); 
    font-weight: 900; 
    margin: 0 0 6px; 
    letter-spacing: -2px; 
}

.subtitle { 
    font-size: 0.95rem; 
    color: #64748b; 
    margin-bottom: 36px; 
}

.score-row { 
    display: flex; 
    gap: 28px; 
    margin-bottom: 36px; 
}

.stat { 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    gap: 3px; 
}

.stat-val { 
    font-family: 'Syne', sans-serif; 
    font-size: 2rem; 
    font-weight: 900; 
    color: #f8fafc; 
}

.stat-label { 
    font-size: 0.7rem; 
    color: #475569; 
    text-transform: uppercase; 
    letter-spacing: 1.5px; 
}

/* Card */
.card {
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(51, 65, 85, 0.7);
    border-radius: 20px; 
    padding: 36px 40px;
    width: 100%; 
    margin-bottom: 28px;
    backdrop-filter: blur(14px);
}

.card-label { 
    font-size: 0.7rem; 
    color: #475569; 
    text-transform: uppercase; 
    letter-spacing: 2px; 
    margin-bottom: 10px; 
    font-weight: 600; 
}

.big-number {
    font-family: 'Syne', sans-serif;
    font-size: clamp(4rem, 16vw, 7rem);
    font-weight: 900; 
    line-height: 1; 
    letter-spacing: -4px;
    color: #f8fafc; 
    margin-bottom: 8px;
    transition: color 0.3s;
}

.big-number.correct { 
    color: #10b981; 
    animation: popIn 0.3s ease; 
}

.big-number.wrong { 
    color: #f87171; 
    animation: shake 0.3s ease; 
}

@keyframes popIn { 
    0% { transform: scale(0.9); } 
    60% { transform: scale(1.05); } 
    100% { transform: scale(1); } 
}

@keyframes shake { 
    0%, 100% { transform: translateX(0); } 
    25% { transform: translateX(-8px); } 
    75% { transform: translateX(8px); } 
}

.range-hint { 
    font-size: 0.8rem; 
    color: #334155; 
}

/* Controls */
.btn-row { 
    display: flex; 
    gap: 16px; 
    margin-bottom: 24px; 
    width: 100%; 
}

.guess-btn {
    flex: 1; 
    padding: 18px;
    background: rgba(30, 58, 138, 0.3);
    border: 1.5px solid rgba(96, 165, 250, 0.3);
    border-radius: 16px; 
    color: #fff;
    font-family: 'Syne', sans-serif; 
    font-size: 1.2rem; 
    font-weight: 700;
    cursor: pointer; 
    transition: background 0.2s, border-color 0.2s, transform 0.1s, box-shadow 0.2s;
}

.guess-btn:hover { 
    background: rgba(37, 99, 235, 0.45); 
    border-color: #60a5fa; 
    box-shadow: 0 0 20px rgba(96, 165, 250, 0.15); 
}

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

/* History Chips */
.history { 
    display: flex; 
    gap: 8px; 
    flex-wrap: wrap; 
    justify-content: center; 
    min-height: 32px; 
    margin-bottom: 16px; 
}

.hist-chip {
    font-size: 0.75rem; 
    font-weight: 700; 
    padding: 4px 10px; 
    border-radius: 99px;
    font-family: 'Syne', sans-serif;
}

.hist-chip.correct { 
    background: rgba(16, 185, 129, 0.15); 
    color: #10b981; 
    border: 1px solid rgba(16, 185, 129, 0.3); 
}

.hist-chip.wrong { 
    background: rgba(239, 68, 68, 0.15); 
    color: #f87171; 
    border: 1px solid rgba(239, 68, 68, 0.3); 
}

.feedback { 
    font-size: 1rem; 
    color: #475569; 
    min-height: 24px; 
    font-style: italic; 
}

/* Game Over Overlay */
.gameover { 
    position: fixed; 
    inset: 0; 
    background: rgba(2, 6, 23, 0.9); 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    z-index: 50; 
    opacity: 0; 
    pointer-events: none; 
    transition: opacity 0.4s; 
    backdrop-filter: blur(8px); 
}

.gameover.show { 
    opacity: 1; 
    pointer-events: all; 
}

.go-emoji { 
    font-size: 4rem; 
    margin-bottom: 12px; 
}

.go-title { 
    font-family: 'Syne', sans-serif; 
    font-size: clamp(1.8rem, 7vw, 2.8rem); 
    font-weight: 900; 
    margin: 0 0 8px; 
}

.go-sub { 
    color: #64748b; 
    font-size: 1rem; 
    margin-bottom: 28px; 
}

.go-sub span { 
    color: #60a5fa; 
    font-weight: 700; 
}

.go-btn { 
    padding: 13px 36px; 
    background: rgba(37, 99, 235, 0.3); 
    border: 1.5px solid rgba(96, 165, 250, 0.45); 
    border-radius: 999px; 
    color: #fff; 
    font-family: 'Syne', sans-serif; 
    font-size: 1rem; 
    font-weight: 700; 
    cursor: pointer; 
    transition: background 0.2s; 
}

.go-btn:hover { 
    background: rgba(37, 99, 235, 0.5); 
}