:root {
    --bg-color: #050505;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-color: #6d28d9;
    --accent-glow: #8b5cf6;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-hover-bg: rgba(255, 255, 255, 0.08);
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Background animated globes */
.background-globes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.globe {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s infinite ease-in-out;
}

.globe-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-color), transparent);
    top: -100px;
    left: -100px;
}

.globe-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #2563eb, transparent);
    bottom: -50px;
    right: -100px;
    animation-delay: -5s;
}

.globe-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, #db2777, transparent);
    top: 40%;
    left: 40%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(30px, -50px); }
    66% { transform: translate(-20px, 20px); }
}

/* Layout & Typography */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

header {
    padding: 4rem 0 2rem;
    text-align: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #fff, #a5b4fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
}

/* Components */
.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
}

/* Rubric Section */
.section-rubric {
    margin-bottom: 5rem;
}

.rubric-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.rubric-card {
    padding: 2rem;
    transition: transform 0.3s ease, background 0.3s ease;
}

.rubric-card:hover {
    transform: translateY(-5px);
    background: var(--card-hover-bg);
    border-color: rgba(255, 255, 255, 0.2);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.card-header .icon {
    font-size: 2rem;
}

.card-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.desc {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    min-height: 3rem;
}

.criteria-list {
    list-style: none;
}

.criteria-list li {
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    border-left: 3px solid transparent;
}

.criteria-list .score-5 { border-color: var(--success-color); }
.criteria-list .score-3 { border-color: var(--warning-color); }
.criteria-list .score-1 { border-color: var(--danger-color); }

/* Examples Section */
.section-examples {
    margin-bottom: 5rem;
}

.section-intro {
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.example-card {
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

.video-container {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    position: relative;
    cursor: pointer;
}

.video-container video, 
.video-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    opacity: 0.8;
    pointer-events: none;
}

.interaction-area {
    padding: 1.5rem;
}

.interaction-area h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.rating-buttons {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.rating-btn {
    flex: 1;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.rating-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.rating-btn.active {
    background: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow);
}

.expert-feedback {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    animation: fadeIn 0.5s ease;
    border: 1px solid var(--glass-border);
}

.expert-feedback.hidden {
    display: none;
}

.expert-badge {
    display: inline-block;
    background: var(--success-color);
    color: #000;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.9rem;
    margin-right: 0.5rem;
}

.feedback-text {
    margin-top: 0.5rem;
    font-size: 0.95rem;
    color: #e5e5e5;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    .rubric-grid { grid-template-columns: 1fr; }
    .examples-grid { grid-template-columns: 1fr; }
    .container { padding: 0 1rem; }
}