/* ============================================
   Chemistry Element Blaster - Screen Styles
   PREMIUM UPGRADE v2.0
   ============================================ */

/* ---------- Screen Overlay Base ---------- */
.screen-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: var(--z-screens);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    background: rgba(3, 10, 14, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
    padding: var(--space-lg);
    padding-top: 60px;
    padding-bottom: 80px;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

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

/* ---- Radial ambient glow ---- */
.screen-overlay::after {
    content: '';
    position: fixed;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 80vw;
    height: 60vh;
    background: radial-gradient(ellipse at center, rgba(0,230,118,0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.screen-overlay > * { position: relative; z-index: 1; }

/* ==========================================
   MAIN MENU — Premium Layout
   ========================================== */

#mainMenu {
    justify-content: center;
    padding-top: var(--space-md);
    padding-bottom: var(--space-lg);
    gap: 0;
    overflow-y: auto;
}

/* Floating element symbols in menu bg */
.menu-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.menu-particle {
    position: absolute;
    font-family: var(--font-display);
    font-size: clamp(12px, 3vw, 20px);
    font-weight: 700;
    opacity: 0;
    animation: menuParticleFloat linear infinite;
    pointer-events: none;
}

@keyframes menuParticleFloat {
    0%   { opacity: 0; transform: translateY(100vh) rotate(0deg); }
    10%  { opacity: 0.12; }
    90%  { opacity: 0.06; }
    100% { opacity: 0; transform: translateY(-10vh) rotate(20deg); }
}

/* ---------- Menu Header ---------- */
.menu-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin-bottom: 20px;
    flex-shrink: 0;
}

.menu-logo-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,230,118,0.15) 0%, rgba(0,230,118,0.03) 70%);
    border: 1.5px solid rgba(0,230,118,0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    box-shadow: 0 0 30px rgba(0,230,118,0.15), inset 0 0 20px rgba(0,230,118,0.05);
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0) scale(1); box-shadow: 0 0 30px rgba(0,230,118,0.15); }
    50% { transform: translateY(-4px) scale(1.02); box-shadow: 0 0 50px rgba(0,230,118,0.25); }
}

/* ---------- Game Title ---------- */
.game-title {
    font-family: var(--font-display);
    font-size: clamp(20px, 5.5vw, 38px);
    font-weight: 900;
    background: linear-gradient(135deg, #e8f5e9, #00e676, #4fc3f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    line-height: 1.15;
    flex-shrink: 0;
    letter-spacing: 1px;
}

.title-accent {
    font-size: 0.72em;
    letter-spacing: 4px;
    display: block;
    background: linear-gradient(90deg, #00e676, #4fc3f7, #ffa726);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.game-subtitle {
    font-family: var(--font-display);
    font-size: clamp(8px, 2vw, 10px);
    color: rgba(232,245,233,0.35);
    letter-spacing: 5px;
    text-transform: uppercase;
    text-align: center;
    flex-shrink: 0;
}

/* ---------- Difficulty Section ---------- */
.diff-section-label {
    font-family: var(--font-display);
    font-size: 9px;
    color: var(--text-muted);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 10px;
    margin-top: 4px;
    flex-shrink: 0;
}

.difficulty-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    width: min(380px, 88vw);
    margin-bottom: 18px;
    flex-shrink: 0;
}

.diff-btn {
    font-family: var(--font-display);
    padding: 10px 8px;
    border-radius: 10px;
    border: 1.5px solid rgba(0,230,118,0.15);
    background: rgba(0,230,118,0.04);
    color: rgba(232,245,233,0.45);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    position: relative;
    overflow: hidden;
}

.diff-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,230,118,0.1), transparent);
    opacity: 0;
    transition: opacity 0.2s;
}

.diff-btn:hover::before { opacity: 1; }
.diff-btn:hover { border-color: rgba(0,230,118,0.4); color: var(--text-secondary); }

.diff-btn.active {
    border-color: var(--lab-green);
    background: rgba(0,230,118,0.12);
    color: var(--lab-green);
    box-shadow: 0 0 16px rgba(0,230,118,0.2), inset 0 0 12px rgba(0,230,118,0.08);
}

.diff-btn.active::before { opacity: 1; }

.diff-name {
    font-size: clamp(9px, 2vw, 11px);
    font-weight: 700;
    letter-spacing: 0.5px;
}

.diff-range {
    font-size: 8px;
    opacity: 0.6;
    font-family: var(--font-body);
    letter-spacing: 0;
}

/* ---------- Primary Actions ---------- */
.menu-primary-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: min(320px, 85vw);
    margin-bottom: 16px;
    flex-shrink: 0;
}

/* ---------- Menu Buttons ---------- */
.menu-btn {
    font-family: var(--font-display);
    font-size: clamp(11px, 2.5vw, 14px);
    font-weight: 700;
    padding: 14px 32px;
    border-radius: 12px;
    border: 1.5px solid;
    cursor: pointer;
    width: 100%;
    text-align: center;
    transition: all 0.2s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-shrink: 0;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

.menu-btn::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
    transition: left 0.5s;
    pointer-events: none;
}
.menu-btn:hover::before { left: 100%; }

.menu-btn.primary {
    background: linear-gradient(135deg, rgba(0,230,118,0.18), rgba(79,195,247,0.12));
    border-color: var(--lab-green);
    color: var(--lab-green);
    box-shadow: 0 0 24px rgba(0,230,118,0.25), inset 0 0 20px rgba(0,230,118,0.05);
}
.menu-btn.primary:hover, .menu-btn.primary:active {
    background: linear-gradient(135deg, rgba(0,230,118,0.3), rgba(79,195,247,0.2));
    box-shadow: 0 0 40px rgba(0,230,118,0.45);
    transform: translateY(-2px);
}

.menu-btn.secondary {
    background: rgba(79,195,247,0.06);
    border-color: rgba(79,195,247,0.4);
    color: var(--lab-cyan);
    box-shadow: 0 0 12px rgba(79,195,247,0.1);
}
.menu-btn.secondary:hover, .menu-btn.secondary:active {
    background: rgba(79,195,247,0.14);
    border-color: var(--lab-cyan);
    box-shadow: 0 0 24px rgba(79,195,247,0.3);
    transform: translateY(-1px);
}

.menu-btn.tertiary {
    background: rgba(171,71,188,0.06);
    border-color: rgba(171,71,188,0.4);
    color: var(--lab-purple);
}
.menu-btn.tertiary:hover, .menu-btn.tertiary:active {
    background: rgba(171,71,188,0.16);
    border-color: var(--lab-purple);
    transform: translateY(-1px);
}

/* ---------- Menu Grid ---------- */
.menu-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: min(320px, 85vw);
    margin-bottom: 16px;
    flex-shrink: 0;
}

.menu-grid-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 14px 8px;
    border-radius: 12px;
    border: 1.5px solid rgba(79,195,247,0.15);
    background: rgba(79,195,247,0.04);
    color: rgba(79,195,247,0.6);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-display);
    font-size: 9px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

.menu-grid-btn svg { opacity: 0.7; transition: opacity 0.2s; }

.menu-grid-btn:hover {
    border-color: rgba(79,195,247,0.45);
    background: rgba(79,195,247,0.1);
    color: var(--lab-cyan);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(79,195,247,0.15);
}

.menu-grid-btn:hover svg { opacity: 1; }

.menu-grid-btn:active { transform: translateY(0) scale(0.97); }

/* ---------- Menu Hint ---------- */
.menu-hint {
    font-size: 10px;
    color: rgba(232,245,233,0.25);
    text-align: center;
    flex-shrink: 0;
    font-family: var(--font-body);
    letter-spacing: 0.5px;
    margin-top: 4px;
}

/* ==========================================
   SCREEN TITLE
   ========================================== */
.screen-title {
    font-family: var(--font-display);
    font-size: clamp(18px, 4.5vw, 28px);
    font-weight: 900;
    color: var(--lab-green);
    text-align: center;
    margin-bottom: var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-shrink: 0;
    text-shadow: 0 0 24px rgba(0,230,118,0.4);
    letter-spacing: 2px;
}

.game-over-title {
    background: linear-gradient(135deg, var(--lab-red), var(--lab-amber));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
}

/* ==========================================
   GAME OVER SCREEN
   ========================================== */
#gameOverScreen {
    justify-content: center;
    padding-top: var(--space-xl);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    width: min(420px, 90vw);
    margin-bottom: var(--space-xl);
    flex-shrink: 0;
}

.stat-card {
    background: linear-gradient(135deg, rgba(0,230,118,0.07), rgba(0,230,118,0.02));
    border: 1px solid rgba(0,230,118,0.12);
    border-radius: 12px;
    padding: 14px 10px;
    text-align: center;
    transition: all 0.2s;
}

.stat-card:hover {
    border-color: rgba(0,230,118,0.25);
    box-shadow: 0 4px 16px rgba(0,230,118,0.08);
}

.stat-value {
    font-family: var(--font-display);
    font-size: clamp(18px, 4.5vw, 24px);
    font-weight: 700;
    color: var(--lab-green);
    display: block;
    margin-bottom: 4px;
    text-shadow: 0 0 10px rgba(0,230,118,0.3);
}

.stat-label {
    font-size: 9px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-family: var(--font-display);
}

/* ---------- New High Score ---------- */
.new-high-score {
    font-family: var(--font-display);
    font-size: 12px;
    color: var(--lab-amber);
    text-align: center;
    margin-bottom: var(--space-lg);
    animation: pulse 1s ease infinite;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-shrink: 0;
    letter-spacing: 2px;
    background: rgba(255,167,38,0.08);
    border: 1px solid rgba(255,167,38,0.25);
    padding: 8px 20px;
    border-radius: 8px;
}

@keyframes pulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 12px rgba(255,167,38,0.2); }
    50% { opacity: 0.6; box-shadow: 0 0 4px rgba(255,167,38,0.1); }
}

.new-high-score.hidden { display: none; }

/* ---------- Action Buttons (Game Over) ---------- */
#gameOverScreen .menu-btn,
#gameOverScreen .share-score-btn,
#gameOverScreen .review-btn {
    margin-bottom: 8px;
    width: min(320px, 85vw);
}

.share-score-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 30px;
    width: min(320px, 85vw);
    border-radius: 12px;
    background: rgba(52,152,219,0.08);
    border: 1.5px solid rgba(52,152,219,0.35);
    color: #3498db;
    font-family: var(--font-display);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 8px;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.share-score-btn:hover {
    background: rgba(52,152,219,0.18);
    box-shadow: 0 0 20px rgba(52,152,219,0.3);
    transform: translateY(-1px);
}

.review-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 30px;
    width: min(320px, 85vw);
    border-radius: 12px;
    background: rgba(155,89,182,0.08);
    border: 1.5px solid rgba(155,89,182,0.35);
    color: #9b59b6;
    font-family: var(--font-display);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 8px;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.review-btn:hover {
    background: rgba(155,89,182,0.2);
    box-shadow: 0 0 20px rgba(155,89,182,0.3);
    transform: translateY(-1px);
}

/* ==========================================
   LEADERBOARD
   ========================================== */
.leaderboard {
    width: min(420px, 90vw);
    margin-bottom: var(--space-xl);
    overflow-y: auto;
    max-height: 45vh;
    flex-shrink: 0;
}

.lb-entry {
    display: grid;
    grid-template-columns: 40px 1fr auto;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px 14px;
    border-bottom: 1px solid rgba(0,230,118,0.06);
    font-size: 13px;
    transition: background 0.15s;
    border-radius: 6px;
}
.lb-entry:hover { background: rgba(0,230,118,0.04); }

.lb-rank { font-family: var(--font-display); font-size: 12px; color: var(--text-muted); text-align: center; }
.lb-rank.top { color: var(--lab-amber); font-weight: 700; }
.lb-name { color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lb-score { font-family: var(--font-display); color: var(--lab-green); font-size: 13px; text-align: right; }
.lb-empty { text-align: center; color: var(--text-muted); padding: var(--space-2xl); font-size: 13px; }

/* ==========================================
   SETTINGS
   ========================================== */
.settings-panel {
    width: min(380px, 90vw);
    margin-bottom: var(--space-xl);
    background: rgba(0,230,118,0.03);
    border: 1px solid rgba(0,230,118,0.1);
    border-radius: 14px;
    overflow: hidden;
    flex-shrink: 0;
}

.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid rgba(0,230,118,0.06);
    gap: var(--space-md);
    transition: background 0.15s;
}
.setting-row:hover { background: rgba(0,230,118,0.03); }
.setting-row:last-child { border-bottom: none; }

.setting-label { font-size: 14px; color: var(--text-secondary); flex: 1; }

.toggle-switch {
    width: 44px; height: 24px;
    border-radius: 12px;
    background: rgba(255,255,255,0.1);
    border: 1.5px solid rgba(255,255,255,0.1);
    cursor: pointer;
    position: relative;
    transition: all 0.25s;
    flex-shrink: 0;
}
.toggle-switch::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 16px; height: 16px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    transition: all 0.25s;
}
.toggle-switch.active {
    background: rgba(0,230,118,0.25);
    border-color: var(--lab-green);
    box-shadow: 0 0 10px rgba(0,230,118,0.2);
}
.toggle-switch.active::after {
    left: 22px;
    background: var(--lab-green);
    box-shadow: 0 0 8px rgba(0,230,118,0.5);
}

.reset-btn, .keyboard-type-btn {
    font-family: var(--font-display);
    font-size: 10px;
    padding: 7px 14px;
    border-radius: 8px;
    border: 1.5px solid var(--lab-red);
    background: rgba(239,83,80,0.08);
    color: var(--lab-red);
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 0.5px;
}
.reset-btn:hover { background: rgba(239,83,80,0.2); }
.keyboard-type-btn { border-color: var(--lab-cyan); color: var(--lab-cyan); background: rgba(79,195,247,0.08); }
.keyboard-type-btn:hover { background: rgba(79,195,247,0.2); }

/* ==========================================
   MODAL (How to Play)
   ========================================== */
.modal-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: calc(var(--z-screens) + 10);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(3,10,14,0.88);
    backdrop-filter: blur(12px);
    padding: var(--space-lg);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}
.modal-overlay.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

.modal-container {
    background: rgba(8, 20, 25, 0.98);
    border: 1px solid rgba(0,230,118,0.2);
    border-radius: 16px;
    width: min(500px, 95vw);
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 60px rgba(0,230,118,0.1), 0 20px 60px rgba(0,0,0,0.5);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid rgba(0,230,118,0.1);
    flex-shrink: 0;
}
.modal-title { font-family: var(--font-display); font-size: clamp(14px,3.5vw,18px); color: var(--lab-green); font-weight: 700; letter-spacing: 1px; }

.modal-close-btn {
    width: 32px; height: 32px;
    background: rgba(239,83,80,0.08);
    border: 1px solid rgba(239,83,80,0.25);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: var(--lab-red); transition: all 0.2s; font-size: 16px; padding: 0;
}
.modal-close-btn:hover { background: rgba(239,83,80,0.2); }

.modal-content { overflow-y: auto; padding: var(--space-xl); flex: 1; -webkit-overflow-scrolling: touch; }
.how-to-play-content { display: flex; flex-direction: column; gap: var(--space-xl); }
.htp-section { display: flex; flex-direction: column; gap: var(--space-sm); }
.htp-heading { font-family: var(--font-display); font-size: 11px; color: var(--lab-amber); font-weight: 700; letter-spacing: 2px; text-transform: uppercase; }
.htp-text { font-size: 13px; color: var(--text-secondary); line-height: 1.65; }
.htp-text strong { color: var(--lab-cyan); }
.htp-example { background: rgba(0,230,118,0.04); border: 1px solid rgba(0,230,118,0.1); border-radius: 8px; padding: var(--space-sm) var(--space-md); display: flex; flex-direction: column; gap: 4px; }
.htp-example-challenge { font-size: 12px; color: var(--text-muted); }
.htp-example-answer { font-size: 12px; color: var(--lab-green); }
code { font-family: 'Courier New', monospace; background: rgba(0,230,118,0.08); padding: 1px 5px; border-radius: 3px; font-size: 11px; color: var(--lab-cyan); }

/* ==========================================
   PAUSE SCREEN
   ========================================== */
#pauseScreen {
    justify-content: center;
    background: rgba(3,10,14,0.95);
}

#pauseScreen .menu-btn {
    width: min(280px, 85vw);
    margin-bottom: 10px;
}

/* ==========================================
   DAILY CHALLENGE SCREEN
   ========================================== */
#dailyChallengeScreen { z-index: 920; justify-content: flex-start; padding-top: 50px; }

.dc-header {
    font-family: var(--font-display);
    font-size: clamp(14px,3.5vw,20px);
    color: #9b59b6;
    text-align: center;
    margin-bottom: 8px;
    font-weight: 700;
    letter-spacing: 2px;
}
.dc-streak { font-size: 12px; color: rgba(200,180,255,0.6); text-align: center; margin-bottom: 20px; letter-spacing: 1px; }
.dc-challenge-card { width: min(380px,90vw); background: rgba(155,89,182,0.07); border: 1.5px solid rgba(155,89,182,0.25); border-radius: 14px; padding: 22px; margin-bottom: 20px; text-align: center; }
.dc-element-symbol { font-family: var(--font-display); font-size: 48px; font-weight: 700; margin-bottom: 4px; }
.dc-element-name { font-size: 14px; color: rgba(200,200,255,0.5); margin-bottom: 16px; }
.dc-question { font-size: 15px; color: rgba(200,180,255,0.85); margin-bottom: 16px; line-height: 1.5; }
.dc-input { width: 100%; padding: 12px 16px; background: rgba(155,89,182,0.08); border: 1.5px solid rgba(155,89,182,0.35); border-radius: 10px; color: #fff; font-family: var(--font-display); font-size: 16px; text-align: center; outline: none; transition: border-color 0.2s; }
.dc-input:focus { border-color: #9b59b6; box-shadow: 0 0 16px rgba(155,89,182,0.3); }
.dc-submit-btn { margin-top: 12px; width: 100%; padding: 12px; border-radius: 10px; background: rgba(155,89,182,0.18); border: 1.5px solid #9b59b6; color: #9b59b6; font-family: var(--font-display); font-size: 13px; font-weight: 700; cursor: pointer; transition: all 0.2s; letter-spacing: 0.5px; }
.dc-submit-btn:hover { background: rgba(155,89,182,0.3); box-shadow: 0 0 16px rgba(155,89,182,0.4); }
.dc-result { font-size: 14px; text-align: center; margin-top: 12px; font-weight: 700; }
.dc-result.correct { color: #2ecc71; } .dc-result.wrong { color: #e74c3c; }
.dc-challenge-text { font-size: 16px; color: rgba(200,180,255,0.9); text-align: center; font-family: var(--font-display); margin-bottom: 8px; line-height: 1.5; }
.dc-hint-text { font-size: 11px; color: rgba(150,130,200,0.5); text-align: center; margin-bottom: 14px; letter-spacing: 0.5px; }
.dc-input-row { display: flex; gap: 8px; width: 100%; margin-bottom: 10px; }
.dc-feedback { font-size: 13px; text-align: center; padding: 8px; border-radius: 8px; margin-bottom: 8px; font-family: var(--font-display); }
.dc-feedback.hidden { display: none; }
.dc-feedback.correct { color: #2ecc71; background: rgba(46,204,113,0.1); border: 1px solid rgba(46,204,113,0.3); }
.dc-feedback.wrong { color: #e74c3c; background: rgba(231,76,60,0.1); border: 1px solid rgba(231,76,60,0.3); }
.dc-reward-label { font-size: 11px; color: rgba(255,200,50,0.5); text-align: center; font-family: var(--font-display); letter-spacing: 0.5px; margin-top: 4px; }
.dc-done { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 20px; background: rgba(46,204,113,0.07); border: 1.5px solid rgba(46,204,113,0.25); border-radius: 14px; }
.dc-check { font-size: 40px; color: #2ecc71; line-height: 1; }
.dc-label { font-family: var(--font-display); font-size: 14px; color: #2ecc71; font-weight: 700; }
.dc-reward { font-size: 12px; color: rgba(255,200,50,0.7); font-family: var(--font-display); }
#dailyChallengeContent .dc-streak { font-size: 11px; color: rgba(200,180,255,0.5); font-family: var(--font-display); letter-spacing: 1px; }

/* ==========================================
   SPRINT MODE
   ========================================== */
#sprintScreen { z-index: 920; justify-content: flex-start; padding-top: 50px; }
.sprint-header { font-family: var(--font-display); font-size: clamp(14px,3.5vw,20px); color: #1abc9c; text-align: center; margin-bottom: 16px; font-weight: 700; letter-spacing: 2px; }
.sprint-timer-display { font-family: var(--font-display); font-size: clamp(36px,9vw,60px); font-weight: 700; color: #1abc9c; text-align: center; margin-bottom: 16px; text-shadow: 0 0 24px rgba(26,188,156,0.5); transition: color 0.3s; }
.sprint-timer-display.sprint-warning { color: #e74c3c; animation: pulse 0.6s ease infinite; }
.sprint-q-card { width: min(380px,90vw); background: rgba(26,188,156,0.07); border: 1.5px solid rgba(26,188,156,0.2); border-radius: 14px; padding: 22px; text-align: center; margin-bottom: 16px; }
.sprint-q-number { font-size: 10px; color: rgba(26,188,156,0.5); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 8px; font-family: var(--font-display); }
.sprint-q-text { font-size: 15px; color: rgba(200,240,235,0.85); line-height: 1.5; }
.sprint-input { width: min(380px,90vw); padding: 14px 16px; background: rgba(26,188,156,0.06); border: 1.5px solid rgba(26,188,156,0.25); border-radius: 10px; color: #fff; font-family: var(--font-display); font-size: 16px; text-align: center; outline: none; transition: all 0.2s; margin-bottom: 10px; }
.sprint-input:focus { border-color: #1abc9c; box-shadow: 0 0 16px rgba(26,188,156,0.3); }
.sprint-result-card { width: min(380px,90vw); background: rgba(26,188,156,0.07); border: 1.5px solid rgba(26,188,156,0.2); border-radius: 14px; padding: 28px; text-align: center; margin-bottom: 20px; }
.sprint-result-score { font-family: var(--font-display); font-size: 44px; font-weight: 700; color: #1abc9c; margin-bottom: 4px; text-shadow: 0 0 20px rgba(26,188,156,0.4); }
.sprint-result-label { font-size: 10px; color: rgba(26,188,156,0.5); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 16px; font-family: var(--font-display); }
.sprint-result-acc { font-size: 14px; color: rgba(200,240,235,0.6); }
.sprint-feedback { transition: opacity 0.3s; }
.sprint-feedback.correct { color: #2ecc71; }
.sprint-feedback.wrong { color: #e74c3c; }

/* ==========================================
   FLASHCARD SCREEN
   ========================================== */
#flashcardScreen { z-index: 920; overflow-y: auto; justify-content: flex-start; padding-top: 50px; }
.fc-screen-title { font-family: var(--font-display); font-size: clamp(14px,3.5vw,20px); color: #f39c12; text-align: center; font-weight: 700; margin-bottom: 16px; letter-spacing: 2px; }
.fc-diff-row { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin-bottom: 16px; }
.fc-diff-btn { font-family: var(--font-display); font-size: 10px; padding: 6px 12px; border-radius: 8px; border: 1.5px solid rgba(243,156,18,0.25); background: rgba(243,156,18,0.05); color: rgba(243,156,18,0.5); cursor: pointer; transition: all 0.2s; letter-spacing: 0.5px; }
.fc-diff-btn:hover, .fc-diff-btn.active { border-color: #f39c12; background: rgba(243,156,18,0.15); color: #f39c12; }
.fc-progress-wrap { width: min(380px,90vw); margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.fc-progress-track { flex: 1; height: 5px; background: rgba(243,156,18,0.1); border-radius: 3px; overflow: hidden; }
.fc-progress-fill { height: 100%; background: linear-gradient(90deg, #f39c12, #e67e22); border-radius: 3px; transition: width 0.4s ease; }
.fc-progress-lbl { font-size: 10px; color: rgba(243,156,18,0.5); font-family: var(--font-display); white-space: nowrap; }
.fc-card-wrap { width: min(280px,80vw); height: 200px; perspective: 1000px; margin-bottom: 16px; cursor: pointer; }
.fc-card { width: 100%; height: 100%; position: relative; transform-style: preserve-3d; transition: transform 0.5s ease; }
.fc-card.flipped { transform: rotateY(180deg); }
.fc-front, .fc-back { position: absolute; inset: 0; border-radius: 14px; backface-visibility: hidden; -webkit-backface-visibility: hidden; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 16px; border: 1.5px solid; background: rgba(10,20,40,0.97); }
.fc-back { transform: rotateY(180deg); }
.fc-symbol { font-family: var(--font-display); font-size: 52px; font-weight: 700; line-height: 1; margin-bottom: 6px; }
.fc-number { font-size: 12px; color: rgba(200,200,200,0.4); margin-bottom: 4px; font-family: var(--font-display); }
.fc-name { font-size: 16px; color: rgba(200,220,255,0.8); font-weight: 600; }
.fc-tap-hint { font-size: 10px; color: rgba(255,255,255,0.2); margin-top: 8px; letter-spacing: 1px; }
.fc-detail-row { display: flex; justify-content: space-between; width: 100%; gap: 8px; margin-bottom: 4px; font-size: 12px; }
.fc-dl { color: rgba(200,200,200,0.4); white-space: nowrap; }
.fc-dv { color: rgba(200,220,255,0.85); text-align: right; font-weight: 600; }
.fc-config { font-size: 9px; word-break: break-all; }
.fc-nav-row { display: flex; gap: 10px; align-items: center; margin-bottom: 12px; }
.fc-nav-btn { width: 40px; height: 40px; border-radius: 8px; background: rgba(243,156,18,0.08); border: 1.5px solid rgba(243,156,18,0.25); color: #f39c12; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s; padding: 0; font-size: 18px; }
.fc-nav-btn:hover { background: rgba(243,156,18,0.2); }
.fc-counter { font-family: var(--font-display); font-size: 12px; color: rgba(243,156,18,0.5); min-width: 60px; text-align: center; }
.fc-shuffle-btn { padding: 8px 20px; border-radius: 8px; background: rgba(243,156,18,0.08); border: 1.5px solid rgba(243,156,18,0.2); color: rgba(243,156,18,0.6); font-family: var(--font-display); font-size: 10px; cursor: pointer; transition: all 0.2s; letter-spacing: 0.5px; display: flex; align-items: center; gap: 6px; }
.fc-shuffle-btn:hover { background: rgba(243,156,18,0.18); color: #f39c12; }

/* ==========================================
   ANSWER HISTORY
   ========================================== */
.answer-history-screen { z-index: 950; padding: 0 !important; align-items: stretch !important; justify-content: stretch !important; }
.ah-panel { width: 100%; height: 100%; display: flex; flex-direction: column; background: rgba(5,15,30,0.98); }
.ah-header { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid rgba(0,230,118,0.1); flex-shrink: 0; flex-wrap: wrap; }
.ah-title { font-family: var(--font-display); font-size: 16px; color: #00e676; font-weight: 700; letter-spacing: 1px; margin: 0; flex: 1; }
.ah-stats { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.ah-stat { display: flex; align-items: center; gap: 5px; font-size: 12px; font-family: var(--font-display); padding: 4px 10px; border-radius: 20px; }
.ah-stat-correct { background: rgba(46,204,113,0.1); color: #2ecc71; border: 1px solid rgba(46,204,113,0.3); }
.ah-stat-wrong   { background: rgba(231,76,60,0.1); color: #e74c3c; border: 1px solid rgba(231,76,60,0.3); }
.ah-stat-acc     { background: rgba(52,152,219,0.1); color: #3498db; border: 1px solid rgba(52,152,219,0.3); }
.ah-close-btn { width: 32px; height: 32px; background: rgba(239,83,80,0.08); border: 1px solid rgba(239,83,80,0.25); border-radius: 8px; color: #ef5350; cursor: pointer; display: flex; align-items: center; justify-content: center; flex-shrink: 0; padding: 0; transition: background 0.2s; }
.ah-close-btn:hover { background: rgba(239,83,80,0.22); }
.ah-list { flex: 1; overflow-y: auto; padding: 8px 12px; -webkit-overflow-scrolling: touch; }
.ah-row { display: flex; align-items: flex-start; gap: 10px; padding: 10px 12px; border-radius: 10px; margin-bottom: 6px; border: 1px solid transparent; transition: border-color 0.15s; }
.ah-row:hover { border-color: rgba(255,255,255,0.07); }
.ah-row-correct { background: rgba(46,204,113,0.05); }
.ah-row-wrong   { background: rgba(231,76,60,0.05); }
.ah-row-icon { flex-shrink: 0; padding-top: 2px; }
.ah-row-symbol { font-family: var(--font-display); font-size: 16px; font-weight: 700; flex-shrink: 0; width: 32px; text-align: center; }
.ah-row-detail { flex: 1; min-width: 0; }
.ah-row-element { font-size: 13px; color: rgba(200,220,255,0.8); font-weight: 600; }
.ah-row-q       { font-size: 11px; color: rgba(150,180,220,0.5); margin-top: 2px; }
.ah-row-your-ans { font-size: 11px; color: rgba(231,76,60,0.7); margin-top: 3px; }
.ah-row-your-ans strong { color: #e74c3c; }
.ah-empty { text-align: center; color: rgba(150,180,220,0.4); padding: 40px 20px; font-size: 13px; }

/* ==========================================
   KEYBOARD CHOICE
   ========================================== */
#keyboardChoiceScreen { justify-content: center; }
#keyboardChoiceScreen .menu-btn { margin-bottom: 6px; }

/* ==========================================
   MISC
   ========================================== */
.el-chip { display: inline-flex; align-items: center; gap: 5px; padding: 3px 8px; border-radius: 20px; font-size: 10px; font-family: var(--font-display); font-weight: 700; margin: 2px; border: 1px solid currentColor; opacity: 0.85; }


/* ==========================================
   SPRINT — QUIT BUTTON (during game)
   ========================================== */
.sprint-quit-btn {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 6px 14px;
    border: 1.5px solid rgba(231,76,60,0.35);
    border-radius: 8px;
    background: rgba(231,76,60,0.08);
    color: rgba(231,76,60,0.75);
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    text-transform: uppercase;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
    margin-bottom: 8px;
}
.sprint-quit-btn:hover {
    background: rgba(231,76,60,0.18);
    border-color: rgba(231,76,60,0.7);
    color: #e74c3c;
}

/* ==========================================
   SPRINT — RESULT PANEL UPGRADES
   ========================================== */
.sprint-result-stats-row {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 16px;
    flex-wrap: wrap;
}
.sprint-stat-chip {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(26,188,156,0.08);
    border: 1px solid rgba(26,188,156,0.2);
    border-radius: 10px;
    padding: 10px 18px;
    min-width: 72px;
}
.sprint-stat-val {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    color: #4fc3f7;
}
.sprint-stat-lbl {
    font-size: 9px;
    color: rgba(26,188,156,0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 3px;
    font-family: var(--font-display);
}
.sprint-new-best {
    margin-top: 14px;
    font-size: 13px;
    font-family: var(--font-display);
    color: #ffbe0b;
    letter-spacing: 1px;
    text-shadow: 0 0 10px rgba(255,190,11,0.4);
    animation: sprintPulse 1.2s ease-in-out infinite alternate;
}
@keyframes sprintPulse {
    from { opacity: 0.7; } to { opacity: 1; }
}

/* ==========================================
   SPRINT — ADVICE BOX
   ========================================== */
.sprint-advice-box {
    width: min(400px,90vw);
    background: rgba(79,195,247,0.07);
    border: 1px solid rgba(79,195,247,0.2);
    border-left: 3px solid #4fc3f7;
    border-radius: 10px;
    padding: 14px 16px;
    margin-bottom: 16px;
}
.sprint-advice-title {
    font-family: var(--font-display);
    font-size: 10px;
    color: #4fc3f7;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
}
.sprint-advice-text {
    font-size: 13px;
    color: rgba(200,240,235,0.75);
    line-height: 1.6;
}

/* ==========================================
   SPRINT — MISSED QUESTIONS REVIEW
   ========================================== */
.sprint-review-section {
    width: min(400px,90vw);
    margin-bottom: 16px;
}
.sprint-review-header {
    display: flex;
    align-items: center;
    gap: 7px;
    font-family: var(--font-display);
    font-size: 10px;
    font-weight: 700;
    color: rgba(231,76,60,0.8);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 10px;
}
.sprint-review-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 260px;
    overflow-y: auto;
    padding-right: 4px;
}
.sprint-review-list::-webkit-scrollbar { width: 4px; }
.sprint-review-list::-webkit-scrollbar-track { background: rgba(255,255,255,0.03); border-radius: 4px; }
.sprint-review-list::-webkit-scrollbar-thumb { background: rgba(231,76,60,0.3); border-radius: 4px; }

.sprint-review-item {
    background: rgba(231,76,60,0.06);
    border: 1px solid rgba(231,76,60,0.18);
    border-radius: 10px;
    padding: 12px 14px;
}
.sprint-review-q {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 6px;
}
.sprint-review-miss-icon {
    color: #e74c3c;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 1px;
}
.sprint-review-qtext {
    font-size: 13px;
    color: rgba(200,220,255,0.8);
    line-height: 1.5;
}
.sprint-review-ans-row {
    font-size: 12px;
    color: rgba(200,240,235,0.5);
    padding-left: 20px;
}
.sprint-review-answer {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 700;
    color: #2ecc71;
}
.sprint-review-hint {
    font-size: 11px;
    color: rgba(79,195,247,0.5);
    padding-left: 20px;
    margin-top: 3px;
    font-style: italic;
}
.sprint-review-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: #1abc9c;
    font-size: 13px;
    padding: 20px;
    text-align: center;
}