/* Urban Solar Quiz Styles - Enhanced Design */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700&family=Raleway:wght@300;400;600&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Raleway', sans-serif;
    background: linear-gradient(135deg, #0f0f23, #1a1a2e, #16213e);
    color: #ecf0f1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    margin: 0;
    padding: 0;
    position: relative;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(0, 255, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 40% 80%, rgba(255, 0, 255, 0.1) 0%, transparent 50%);
    animation: colorShift 10s ease-in-out infinite;
    z-index: -2;
}

@keyframes colorShift {
    0%, 100% { filter: hue-rotate(0deg); }
    25% { filter: hue-rotate(90deg); }
    50% { filter: hue-rotate(180deg); }
    75% { filter: hue-rotate(270deg); }
}

.background-video {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
    opacity: 0.4;
    filter: blur(1px);
}

.container {
    width: 100%;
    max-width: 650px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    overflow: hidden;
    position: relative;
    animation: containerGlow 4s ease-in-out infinite alternate;
}

@keyframes containerGlow {
    0% { box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1); }
    100% { box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 0 30px rgba(255, 215, 0, 0.3); }
}

.screen {
    display: none;
    padding: 50px;
    text-align: center;
    animation: slideIn 0.6s ease-out;
}

.screen.active {
    display: block;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

h1 {
    font-family: 'Orbitron', monospace;
    font-size: 3em;
    margin-bottom: 20px;
    background: linear-gradient(45deg, #ffd700, #ff6b6b, #4ecdc4, #45b7d1);
    background-size: 400% 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease-in-out infinite;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.5);
}

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

h2 {
    font-size: 2em;
    margin-bottom: 20px;
    color: #ff6b6b;
    text-shadow: 0 0 15px rgba(255, 107, 107, 0.5);
}

p {
    font-size: 1.2em;
    margin-bottom: 30px;
    color: #bdc3c7;
    line-height: 1.6;
}

button {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 18px 35px;
    font-size: 1.3em;
    font-weight: 600;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.4s ease;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

button:hover::before {
    left: 100%;
}

button:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 12px 30px rgba(102, 126, 234, 0.6);
}

button:active {
    transform: translateY(-2px) scale(1.02);
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    margin-bottom: 30px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #ffd700, #ff6b6b, #4ecdc4);
    background-size: 200% 200%;
    animation: progressGlow 2s ease-in-out infinite;
    width: 0%;
    transition: width 0.6s ease;
    border-radius: 6px;
}

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

.options {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-bottom: 30px;
}

.option {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 18px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.4s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.option:hover::before {
    left: 100%;
}

.option:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(10px) scale(1.02);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.option.selected {
    border-color: #ffd700;
    background: rgba(255, 215, 0, 0.2);
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.5);
}

.option.correct {
    border-color: #4ecdc4;
    background: rgba(78, 205, 196, 0.2);
    box-shadow: 0 0 20px rgba(78, 205, 196, 0.5);
}

.option.incorrect {
    border-color: #ff6b6b;
    background: rgba(255, 107, 107, 0.2);
    box-shadow: 0 0 20px rgba(255, 107, 107, 0.5);
}

.hidden {
    display: none;
}

#score {
    font-family: 'Orbitron', monospace;
    font-size: 4em;
    font-weight: bold;
    background: linear-gradient(45deg, #ffd700, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    text-shadow: 0 0 30px rgba(255, 215, 0, 0.5);
    animation: scorePulse 2s ease-in-out infinite;
}

@keyframes scorePulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Floating particles */
.container::before,
.container::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
    pointer-events: none;
}

.container::before {
    top: -40px;
    left: -40px;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.6) 0%, transparent 70%);
    animation-delay: 0s;
}

.container::after {
    bottom: -30px;
    right: -30px;
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, rgba(78, 205, 196, 0.6) 0%, transparent 70%);
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}