/* CSS Variables for Premium Gamified Theme */
:root {
    --primary-color: #E63946;
    --secondary-color: #F1FAEE;
    --accent-color: #4A90E2;
    --success-color: #2ECC71;
    --error-color: #E74C3C;
    --bg-gradient: linear-gradient(135deg, #0f2027, #203a43, #2c5364); /* Deeper, more modern gradient */
    --card-bg: rgba(255, 255, 255, 0.85);
    --dark-text: #1e293b;
    --light-text: #f8fafc;
    --border-radius-lg: 28px;
    --border-radius-md: 20px;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.15);
    --glass-border: 1px solid rgba(255, 255, 255, 0.4);
    --glass-blur: blur(20px);
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Inter', -apple-system, sans-serif; -webkit-tap-highlight-color: transparent; }

/* Custom Scrollbars for visibility on mobile and desktop */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.05); border-radius: 10px; margin: 5px; }
::-webkit-scrollbar-thumb { background: rgba(255, 209, 102, 0.6); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 209, 102, 1); }

body {
    background: var(--bg-gradient);
    background-size: 300% 300%;
    animation: gradientBG 20s ease infinite;
    color: var(--dark-text);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100dvh;
    width: 100vw;
    overflow: hidden;
    overscroll-behavior-y: none; 
}

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

/* Music Player Widget */
.music-toggle {
    position: fixed; top: 20px; right: 20px; width: 50px; height: 50px;
    border-radius: 50%; background-color: rgba(255,255,255,0.15);
    backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border); color: white; font-size: 20px;
    display: flex; justify-content: center; align-items: center; cursor: pointer;
    z-index: 1000; transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.music-toggle:active { transform: scale(0.9); }
.music-toggle.playing {
    background-color: #FFD166; color: #b37700; border-color: #FFD166;
    animation: pulse-music 2s infinite;
}

@keyframes pulse-music {
    0% { box-shadow: 0 0 0 0 rgba(255, 209, 102, 0.6); }
    70% { box-shadow: 0 0 0 15px rgba(255, 209, 102, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 209, 102, 0); }
}

.app-container {
    width: 100%; max-width: 480px; height: 100dvh; max-height: 900px;
    position: relative; display: flex; flex-direction: column; overflow: hidden;
}

@media (min-width: 481px) {
    .app-container {
        height: 95vh; border-radius: 36px;
        box-shadow: 0 30px 60px rgba(0,0,0,0.4);
        background: rgba(255, 255, 255, 0.03);
        backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
        border: var(--glass-border);
    }
}

/* Smooth Screen Transitions */
.screen {
    display: none; flex-direction: column; height: 100%; padding: 28px 24px;
    opacity: 0; overflow-y: auto; overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.screen.active {
    display: flex; opacity: 1;
    animation: slideInRight 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

h1 { font-size: 34px; font-weight: 800; text-align: center; margin-bottom: 8px; color: white; text-shadow: 0 2px 10px rgba(0,0,0,0.3); }
h2 { color: white; font-weight: 700; letter-spacing: -0.5px; }
p { font-size: 16px; text-align: center; margin-bottom: 24px; color: var(--secondary-color); line-height: 1.5; }

.icon-header { font-size: 64px; color: #FFD166; text-align: center; margin-bottom: 12px; filter: drop-shadow(0 4px 12px rgba(255, 209, 102, 0.4)); animation: float 3s ease-in-out infinite; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Login Box (Glassmorphism) */
.login-box {
    background: rgba(255, 255, 255, 0.1); padding: 32px 24px;
    border-radius: var(--border-radius-md); margin-top: 20px; width: 100%;
    backdrop-filter: blur(25px); -webkit-backdrop-filter: blur(25px);
    border: var(--glass-border); display: flex; flex-direction: column; gap: 20px;
    box-shadow: var(--shadow-md);
}

#username-input {
    width: 100%; padding: 18px; border-radius: 50px;
    border: 2px solid rgba(255, 255, 255, 0.6); background-color: rgba(255, 255, 255, 0.95);
    font-size: 18px; font-weight: 600; text-align: center; outline: none;
    transition: all 0.3s; color: var(--dark-text);
}
#username-input:focus { border-color: var(--accent-color); box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.2); transform: translateY(-2px); }

/* Start Screen Bar */
.top-bar-start { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.top-bar-start h2 { margin: 0; font-size: 26px; }
.icon-btn-small {
    background: rgba(255,255,255,0.15); backdrop-filter: blur(10px);
    border: var(--glass-border); color: white; width: 40px; height: 40px;
    border-radius: 50%; cursor: pointer; transition: all 0.2s;
    display: flex; justify-content: center; align-items: center;
}
.icon-btn-small:hover { background: rgba(255,255,255,0.3); transform: scale(1.1); }
.icon-btn-small:active { transform: scale(0.95); }

/* Mascot */
.mascot-container { height: 130px; width: 130px; margin: 0 auto 24px auto; display: flex; justify-content: center; align-items: center; }
.mascot-svg { width: 100%; height: 100%; filter: drop-shadow(0 12px 24px rgba(0,0,0,0.3)); }
.anim-bounce { animation: mascot-bounce 2.5s infinite cubic-bezier(0.45, 0, 0.15, 1); }
.anim-shake { animation: mascot-shake 0.8s infinite; }
.anim-happy { animation: mascot-bounce 1s infinite ease-in-out, glow 2s infinite alternate; }

@keyframes mascot-bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-18px) scale(1.03); } }
@keyframes mascot-shake { 0%, 100% { transform: translateX(0) rotate(0); } 25%, 75% { transform: translateX(-3px) rotate(-6deg); } 50% { transform: translateX(3px) rotate(6deg); } }
@keyframes glow { from { filter: drop-shadow(0 0 10px #FFD166); } to { filter: drop-shadow(0 0 25px #FFD166); } }

/* Game Modes Menu Grid */
.menu-grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-bottom: 24px; }
.extras-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }

.menu-card, .module-card {
    background: var(--card-bg); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border); border-radius: var(--border-radius-md); padding: 20px;
    text-align: left; cursor: pointer; transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
    color: var(--dark-text);
}

.module-select-container { display: flex; flex-direction: column; flex: 1; overflow-y: auto; padding-bottom: 20px; -webkit-overflow-scrolling: touch; }
.module-grid { display: flex; flex-direction: column; gap: 12px; }
.module-card { padding: 18px 20px; font-weight: 600; font-size: 16px; display: flex; align-items: center; gap: 15px; }
.module-card i { font-size: 22px; color: var(--accent-color); width: 30px; text-align: center; }

.full-exam-btn { 
    background: linear-gradient(135deg, #FFD166, #F4A261); 
    border: none; color: #1e293b; align-items: flex-start;
    box-shadow: 0 10px 25px rgba(244, 162, 97, 0.4); 
}
.full-exam-btn i { font-size: 32px; color: #1e293b; width: 40px; margin-top: 5px; }
.full-exam-btn h3 { margin: 0 0 5px 0; font-size: 20px; font-weight: 800; }
.full-exam-btn p { margin: 0; font-size: 14px; opacity: 0.9; }
.full-exam-btn:hover { box-shadow: 0 15px 30px rgba(244, 162, 97, 0.6); transform: translateY(-3px) scale(1.02); }

.menu-card::after { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: linear-gradient(rgba(255,255,255,0.2), transparent); opacity: 0; transition: opacity 0.3s; pointer-events: none; }
.menu-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.menu-card:hover::after { opacity: 1; }
.menu-card:active { transform: translateY(1px) scale(0.98); box-shadow: 0 2px 5px rgba(0,0,0,0.1); }

.menu-card i { font-size: 28px; margin-bottom: 12px; display: block; }
.menu-card h3 { font-size: 19px; margin-bottom: 6px; color: var(--dark-text); font-weight: 700; }
.menu-card p { font-size: 13px; margin: 0; text-align: left; color: #64748b; line-height: 1.4; }

.classic-mode i { color: #4A90E2; filter: drop-shadow(0 2px 5px rgba(74, 144, 226, 0.4)); }
.exam-mode i { color: #9B51E0; filter: drop-shadow(0 2px 5px rgba(155, 81, 224, 0.4)); }
.survival-mode i { color: #E74C3C; filter: drop-shadow(0 2px 5px rgba(231, 76, 60, 0.4)); }

.extra-card { text-align: center; padding: 14px; background: rgba(255,255,255,0.15); border: var(--glass-border); color: white; display: flex; flex-direction: column; justify-content: center; }
.extra-card h4 { font-size: 13px; margin-top: 8px; font-weight: 600; }
.extra-card i { font-size: 24px; margin: 0 auto; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3)); }

/* General Buttons */
button { border: none; outline: none; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), #ff4d6d);
    color: white; font-size: 18px; font-weight: 700; padding: 18px; border-radius: 50px;
    width: 100%; box-shadow: 0 6px 15px rgba(230, 57, 70, 0.4), 0 6px 0 #b32a35;
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1); margin-bottom: 16px; position: relative; top: 0;
}
.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(230, 57, 70, 0.5), 0 6px 0 #b32a35; filter: brightness(1.1); }
.primary-btn:active { top: 6px; transform: translateY(0) scale(0.98); box-shadow: 0 0 0 transparent; filter: brightness(0.9); }

.secondary-btn {
    background-color: transparent; color: white; border: 2px solid rgba(255,255,255,0.5);
    font-size: 16px; font-weight: 600; padding: 14px; border-radius: 50px; width: 100%;
    transition: all 0.3s; backdrop-filter: blur(5px);
}
.secondary-btn:hover { background-color: rgba(255,255,255,0.2); border-color: white; transform: scale(1.02); }
.secondary-btn:active { transform: scale(0.98); }

/* Headers */
.quiz-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.icon-btn { background: rgba(255,255,255,0.15); border: var(--glass-border); color: white; width: 48px; height: 48px; border-radius: 50%; font-size: 20px; display: flex; justify-content: center; align-items: center; backdrop-filter: blur(10px); transition: all 0.2s; box-shadow: var(--shadow-sm); }
.icon-btn:hover { background: rgba(255,255,255,0.3); transform: scale(1.1); }
.icon-btn:active { transform: scale(0.95); }

.streak-counter { background: rgba(0,0,0,0.4); backdrop-filter: blur(5px); color: white; padding: 8px 16px; border-radius: 24px; font-weight: 800; opacity: 0.5; transition: all 0.3s; border: 1px solid rgba(255,255,255,0.1); }
.streak-counter.active { opacity: 1; background: linear-gradient(135deg, #FF9F1C, #FFD166); color: #1e293b; box-shadow: 0 0 15px rgba(255, 159, 28, 0.5); border: none; transform: scale(1.05); }
.question-counter { color: white; font-weight: 700; font-size: 20px; text-shadow: 0 2px 4px rgba(0,0,0,0.3); }

/* Exam Global Timer */
.exam-timer { font-size: 26px; font-weight: 800; background: rgba(0,0,0,0.6); backdrop-filter: blur(10px); padding: 10px 20px; border-radius: 12px; color: #FFF; font-family: 'Courier New', Courier, monospace; letter-spacing: 2px; border: var(--glass-border); box-shadow: inset 0 2px 10px rgba(0,0,0,0.5); }
.exam-timer.warning { color: #FFD166; text-shadow: 0 0 10px rgba(255, 209, 102, 0.5); }
.exam-timer.danger { color: #E74C3C; animation: pulse-danger 1s infinite; text-shadow: 0 0 10px rgba(231, 76, 60, 0.8); }

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

/* Exam Grid Navigation */
.exam-grid-container { background: rgba(255,255,255,0.1); padding: 16px; border-radius: var(--border-radius-md); margin-bottom: 20px; max-height: 160px; overflow-y: auto; border: var(--glass-border); backdrop-filter: blur(10px); }
.exam-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 8px; }
.exam-nav-btn { background: rgba(255,255,255,0.7); border: none; border-radius: 8px; color: var(--dark-text); font-size: 13px; font-weight: 800; min-height: 36px; padding: 4px; transition: all 0.2s; cursor: pointer; }
.exam-nav-btn:hover { background: white; transform: translateY(-2px); }
.exam-nav-btn.answered { background: var(--accent-color); color: white; box-shadow: 0 4px 10px rgba(74, 144, 226, 0.3); }
.exam-nav-btn.active { border: 3px solid #FFD166; transform: scale(1.15); box-shadow: 0 0 15px rgba(255, 209, 102, 0.8); z-index: 10; background: white; color: var(--dark-text); }
.exam-actions { display: flex; gap: 12px; margin-top: auto; padding-top: 12px; }

/* Timer Bar */
.timer-container { width: 100%; height: 10px; background-color: rgba(255,255,255,0.2); border-radius: 12px; margin-bottom: 20px; overflow: hidden; box-shadow: inset 0 2px 5px rgba(0,0,0,0.2); border: 1px solid rgba(255,255,255,0.1); }
.timer-bar { height: 100%; background: linear-gradient(90deg, #2ECC71, #27ae60); width: 100%; transition: width 1s linear, background 0.3s; border-radius: 12px; box-shadow: 0 0 10px rgba(46, 204, 113, 0.5); }
.timer-bar.warning { background: linear-gradient(90deg, #F1C40F, #f39c12); box-shadow: 0 0 10px rgba(241, 196, 15, 0.5); }
.timer-bar.danger { background: linear-gradient(90deg, #E74C3C, #c0392b); box-shadow: 0 0 10px rgba(231, 76, 60, 0.5); }

/* Wildcards */
.wildcards-panel { display: flex; justify-content: flex-end; gap: 16px; margin-bottom: 20px; }
.wildcard-btn { background: linear-gradient(135deg, #FFD166, #FFB347); color: #8a5a00; border-radius: 24px; padding: 10px 20px; font-weight: 800; font-size: 15px; box-shadow: 0 4px 15px rgba(255, 209, 102, 0.4), 0 5px 0 #d9a838; position: relative; top: 0; transition: all 0.2s; }
.wildcard-btn:hover { transform: translateY(-2px); filter: brightness(1.05); }
.wildcard-btn:active { top: 5px; box-shadow: 0 0 0 transparent; transform: translateY(0); }
.wildcard-btn.used { background: #cbd5e1; color: #64748b; box-shadow: none; top: 5px; pointer-events: none; filter: none; }

/* Question Cards */
.question-card {
    background: var(--card-bg); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border); border-radius: var(--border-radius-lg);
    padding: 32px 24px; margin-bottom: 24px; box-shadow: var(--shadow-md);
    position: relative; text-align: center; min-height: 180px;
    display: flex; flex-direction: column; justify-content: center;
}
.category-label {
    position: absolute; top: -16px; left: 50%; transform: translateX(-50%);
    background: linear-gradient(135deg, var(--accent-color), #2980B9); color: white;
    font-size: 13px; font-weight: 800; padding: 6px 16px; border-radius: 24px;
    box-shadow: 0 4px 10px rgba(74, 144, 226, 0.4); border: 2px solid white; white-space: nowrap;
}
#question-text, #exam-question-text { font-size: 20px; font-weight: 600; line-height: 1.5; overflow-wrap: break-word; color: var(--dark-text); margin: 0; }

/* Staggered Animated Options */
.options-container { display: flex; flex-direction: column; gap: 14px; flex-grow: 1; overflow-y: auto; padding-bottom: 20px; }
.option-btn {
    background-color: rgba(255, 255, 255, 0.95); border: 2px solid #e2e8f0; border-radius: var(--border-radius-md);
    padding: 18px 24px; font-size: 17px; font-weight: 600; text-align: left;
    box-shadow: 0 6px 0 #cbd5e1; position: relative; top: 0; color: var(--dark-text);
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s, border-color 0.2s;
    opacity: 0; /* Start hidden for animation */
}
.option-btn.animate-in { animation: fadeUpIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards; }

@keyframes fadeUpIn {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

.option-btn:hover:not(.disabled) { transform: translateY(-2px); border-color: var(--accent-color); background-color: #f8fafc; }
.option-btn:active:not(.disabled) { top: 6px; box-shadow: 0 0 0 transparent; transform: translateY(0); }
.option-btn.selected-exam { border-color: #9B51E0; background-color: #F3E5F5; box-shadow: 0 6px 0 #9B51E0; }
.option-btn.correct { background: linear-gradient(135deg, var(--success-color), #27ae60); border-color: transparent; color: white; box-shadow: 0 6px 0 #1e8449, 0 4px 15px rgba(46, 204, 113, 0.4); }
.option-btn.incorrect { background: linear-gradient(135deg, var(--error-color), #c0392b); border-color: transparent; color: white; box-shadow: 0 6px 0 #922b21, 0 4px 15px rgba(231, 76, 60, 0.4); }
.option-btn.disabled { pointer-events: none; opacity: 0.85 !important; }

/* Feedback */
.feedback-panel { position: absolute; bottom: 0; left: 0; width: 100%; max-height: 85vh; overflow-y: auto; background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); border-radius: 32px 32px 0 0; padding: 32px 24px; box-shadow: 0 -15px 40px rgba(0,0,0,0.3); transform: translateY(105%); transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1); z-index: 100; display: flex; flex-direction: column; border-top: var(--glass-border); }
.feedback-panel.show { transform: translateY(0); }
.feedback-panel.hidden { display: none; }
.feedback-header { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.feedback-icon { font-size: 32px; animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
@keyframes popIn { 0% { transform: scale(0); } 80% { transform: scale(1.2); } 100% { transform: scale(1); } }
.correct-theme .feedback-icon, .correct-theme h3 { color: var(--success-color); font-size: 24px; font-weight: 800; }
.incorrect-theme .feedback-icon, .incorrect-theme h3 { color: var(--error-color); font-size: 24px; font-weight: 800; }
#feedback-explanation, .feedback-panel p { color: #475569; font-size: 16px; margin-bottom: 24px; text-align: left; line-height: 1.6; }

/* Stats & Dashboard */
.history-chart-container { background: rgba(255,255,255,0.85); backdrop-filter: blur(10px); border-radius: var(--border-radius-md); padding: 12px; margin-bottom: 24px; width: 100%; height: 180px; box-shadow: var(--shadow-sm); border: var(--glass-border); }
.stats-box { background: rgba(255,255,255,0.15); padding: 20px; border-radius: var(--border-radius-md); backdrop-filter: var(--glass-blur); border: var(--glass-border); box-shadow: var(--shadow-sm); }
.score-circle { width: 160px; height: 160px; background: white; border-radius: 50%; display: flex; flex-direction: column; justify-content: center; align-items: center; margin: 0 auto 28px auto; border: 10px solid var(--accent-color); box-shadow: 0 10px 30px rgba(0,0,0,0.2), inset 0 4px 10px rgba(0,0,0,0.1); }
#score-text { font-size: 52px; font-weight: 900; color: var(--dark-text); line-height: 1; }
.dashboard-box { background: rgba(255,255,255,0.15); backdrop-filter: blur(10px); border-radius: var(--border-radius-md); padding: 20px; width: 100%; margin-bottom: 24px; border: var(--glass-border); color: white; box-shadow: var(--shadow-sm); }
.dashboard-box h3 { font-size: 18px; margin-bottom: 12px; text-shadow: 0 2px 4px rgba(0,0,0,0.2); }
.dash-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.2); font-weight: 600; }
.dash-row:last-child { border-bottom: none; }

/* Review Screen */
.review-item { background: rgba(255,255,255,0.95); border-radius: var(--border-radius-md); padding: 20px; margin-bottom: 20px; color: var(--dark-text); box-shadow: var(--shadow-sm); border: 1px solid rgba(255,255,255,0.6); }
.review-item h4 { font-size: 18px; color: var(--error-color); margin-bottom: 12px; }
.review-item p { margin-bottom: 6px; }
.review-item .explanation { margin-top: 10px; background: rgba(0,0,0,0.03); padding: 12px; border-radius: 6px; border-left: 3px solid #F4A261; }

.review-module-details { background: var(--card-bg); border-radius: 8px; margin-bottom: 12px; border: var(--glass-border); box-shadow: var(--shadow-sm); }
.review-module-details summary { font-weight: 700; cursor: pointer; padding: 16px; outline: none; list-style: none; display: flex; justify-content: space-between; align-items: center; color: var(--dark-text); font-size: 16px; }
.review-module-details summary::-webkit-details-marker { display: none; }
.review-module-details summary::after { content: '▼'; font-size: 12px; opacity: 0.7; }
.review-module-details[open] summary::after { content: '▲'; }
.details-content { padding: 0 16px 16px 16px; }

/* Trofeos / Badges */
.badges-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding-bottom: 24px; }
.badge-card { background: rgba(255,255,255,0.8); backdrop-filter: blur(5px); border-radius: 16px; padding: 20px; text-align: center; opacity: 0.5; filter: grayscale(100%); transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275); border: 1px solid rgba(255,255,255,0.5); }
.badge-card.unlocked { opacity: 1; filter: grayscale(0%); background: linear-gradient(135deg, #FFD166 0%, #FF9F1C 100%); color: #1e293b; box-shadow: 0 10px 25px rgba(255, 159, 28, 0.5); transform: scale(1.05); border: none; }
.badge-icon { font-size: 46px; margin-bottom: 12px; filter: drop-shadow(0 4px 6px rgba(0,0,0,0.2)); }
.badge-card h4 { font-size: 17px; font-weight: 800; margin-bottom: 6px; }
.badge-card p { font-size: 13px; margin: 0; color: rgba(0,0,0,0.7); font-weight: 500; }

/* Flashcards 3D */
.flashcards-container { flex-grow: 1; display: flex; flex-direction: column; align-items: center; padding-top: 24px; }
.instruction-text { color: white; font-weight: 600; margin-bottom: 24px; text-shadow: 0 2px 4px rgba(0,0,0,0.3); }
#flashcards-slider { width: 100%; max-width: 340px; height: 380px; perspective: 1500px; }
.flashcard { width: 100%; height: 100%; position: relative; transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275); transform-style: preserve-3d; cursor: pointer; }
.flashcard:hover { transform: scale(1.02); }
.flashcard.is-flipped { transform: rotateY(180deg) scale(1); }
.flashcard-face { position: absolute; width: 100%; height: 100%; backface-visibility: hidden; border-radius: var(--border-radius-lg); display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 32px; box-shadow: var(--shadow-md); border: var(--glass-border); }
.flashcard-front { background: rgba(255,255,255,0.95); color: var(--dark-text); border: 5px solid var(--accent-color); backdrop-filter: blur(10px); }
.flashcard-front h3 { font-size: 28px; font-weight: 900; color: var(--accent-color); margin-bottom: 12px; text-align: center; }
.flashcard-back { background: linear-gradient(135deg, var(--accent-color), #2980B9); color: white; transform: rotateY(180deg); font-size: 24px; border: 5px solid white; }
.flashcard-controls { display: flex; align-items: center; gap: 24px; margin-top: 36px; }
#fc-counter { color: white; font-weight: 800; font-size: 20px; background: rgba(0,0,0,0.3); padding: 8px 16px; border-radius: 20px; }

/* Survival Mode Specifcs */
.survival-theme { --bg-gradient: linear-gradient(135deg, #4a0000 0%, #8b0000 100%); }
.survival-theme .primary-btn { background: linear-gradient(135deg, #1e293b, #0f172a); box-shadow: 0 6px 15px rgba(0,0,0,0.4), 0 6px 0 #000; }

/* Glossary Screen */
#glossary-search {
    width: 100%; padding: 18px; border-radius: 50px; border: 2px solid rgba(255,255,255,0.5); background: rgba(255,255,255,0.95); font-size: 17px; font-weight: 500; margin-bottom: 20px; outline: none; transition: all 0.3s; box-shadow: var(--shadow-sm);
}
#glossary-search:focus { border-color: var(--accent-color); box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.2); transform: translateY(-2px); }
.glossary-item { background: rgba(255,255,255,0.95); border-radius: var(--border-radius-md); padding: 20px; color: var(--dark-text); text-align: left; margin-bottom: 12px; box-shadow: var(--shadow-sm); border: 1px solid rgba(255,255,255,0.6); transition: transform 0.2s; }
.glossary-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.glossary-item h3 { color: var(--accent-color); margin-bottom: 8px; font-size: 19px; font-weight: 800; }
.glossary-item p { margin: 0; font-size: 15px; color: #334155; text-align: left; line-height: 1.5; }

/* Floating Calculator - Mobile Optimized */
#calculator-panel {
    position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%) translateY(20px); width: 90%; max-width: 320px; background: rgba(255,255,255,0.98); backdrop-filter: blur(25px); -webkit-backdrop-filter: blur(25px); border-radius: 28px; padding: 20px; box-shadow: 0 20px 50px rgba(0,0,0,0.4); z-index: 1000; transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); border: var(--glass-border); opacity: 0; pointer-events: none;
}
#calculator-panel.show-calc { transform: translateX(-50%) translateY(0); opacity: 1; pointer-events: all; }
#calc-display { background: #1e293b; color: #4ade80; padding: 16px; font-size: 28px; text-align: right; border-radius: 12px; margin-bottom: 16px; font-family: 'Courier New', Courier, monospace; overflow-x: auto; white-space: nowrap; box-shadow: inset 0 4px 10px rgba(0,0,0,0.5); font-weight: bold; }
.calc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.calc-btn { background: #f1f5f9; border: none; border-radius: 12px; font-size: 20px; font-weight: 800; color: var(--dark-text); min-height: 48px; box-shadow: 0 4px 0 #cbd5e1; position: relative; top: 0; transition: all 0.1s; cursor: pointer; }
.calc-btn:active { top: 4px; box-shadow: none; background: #e2e8f0; }

/* AI Tutor */
.ai-btn { background: linear-gradient(135deg, #8B5CF6 0%, #6D28D9 100%); color: white; border: none; padding: 16px; border-radius: 12px; font-weight: 800; width: 100%; cursor: pointer; margin-top: 20px; font-size: 15px; box-shadow: 0 6px 20px rgba(109, 40, 217, 0.4); transition: all 0.3s; }
.ai-btn:hover { transform: translateY(-3px); box-shadow: 0 10px 25px rgba(109, 40, 217, 0.6); filter: brightness(1.1); }
.ai-btn:active { transform: translateY(1px); box-shadow: 0 2px 10px rgba(109, 40, 217, 0.4); }
.ai-btn:disabled { opacity: 0.7; cursor: not-allowed; transform: none; box-shadow: none; }
#ai-response-box { background: rgba(139, 92, 246, 0.1); border-left: 5px solid #8B5CF6; padding: 20px; border-radius: 0 12px 12px 0; margin-top: 20px; font-size: 15px; color: var(--dark-text); text-align: left; box-shadow: inset 0 2px 10px rgba(0,0,0,0.05); }
.ai-header { color: #6D28D9; font-weight: 900; font-size: 16px; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
#ai-content { line-height: 1.6; font-weight: 500; }

@media (max-width: 380px) {
    .screen { padding: 20px 16px; }
    .menu-grid { gap: 12px; }
    .menu-card { padding: 16px; }
    .exam-grid { grid-template-columns: repeat(6, 1fr); }
    #calculator-panel { width: 95%; bottom: 10px; }
    h1 { font-size: 28px; }
}