:root {
    --primary-color: #e68c50;
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --card-bg: #ffffff;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Hero Section */
.hero {
    position: relative;
    height: 400px;
    background: url('../image/scotty.png') center no-repeat;
    background-size: 40% auto;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

.hero-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.7);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 { font-size: 3rem; margin-bottom: 10px; font-weight: 600; letter-spacing: -1px; }

.course-tag {
    background: var(--primary-color);
    padding: 5px 15px;
    border-radius: 10px;
    font-size: 0.9rem;
}

/* Sticky Tabs */
.tab-container {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e2e8f0;
    z-index: 100;
    display: flex;
    justify-content: center;
}

.tabs { display: flex; gap: 20px; }

.tab-link {
    border: none;
    background: none;
    padding: 15px 25px;
    cursor: pointer;
    font-size: 1rem;
    color: #64748b;
    transition: 0.3s;
    border-bottom: 3px solid transparent;
}

.tab-link:hover { color: var(--primary-color); }

.tab-link.active {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
    font-weight: 600;
}

/* Content */
.content-wrapper {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

.tab-content { display: none; animation: fadeIn 0.5s; }
.tab-content.active { display: block; }

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

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    text-align: center;
    border: 1px solid #e2e8f0;
}

.architecture {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.arch-img {
    max-width: 50%;
    height: auto;
    border-radius: 10px;
}

.arch-desc {
    max-width: 50%;
}

.arch-desc p {
    margin: 8px 0;
}

.report-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.report-card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
}

.report-card h3 {
    margin-top: 0;
    margin-bottom: 10px;
}

.report-actions {
    display: flex;
    gap: 12px;
    margin-top: 18px;
    flex-wrap: wrap;
}

.report-button {
    display: inline-block;
    padding: 10px 16px;
    border-radius: 10px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.report-button:hover {
    opacity: 0.92;
    transform: translateY(-1px);
}

.report-button.secondary {
    background: #334155;
}