:root {
    --color-primary: #18233B; /* Dark Blue */
    --color-red: #C82929; /* Deep Red */
    --color-text-main: #334155;
    --color-text-muted: #64748B;
    --color-bg-page: #F3F4F6;
    --color-bg-card: #FFFFFF;
    --color-bg-banner: #F8FAFC;
    --color-border: #E2E8F0;
    
    --font-main: 'Inter', sans-serif;
}

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

button {
    border: 1px solid transparent;
    background: none;
    font: inherit;
    cursor: pointer;
    outline: none;
    box-shadow: none;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg-page);
    color: var(--color-text-main);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 20px;
}

.main-card {
    background-color: var(--color-bg-card);
    width: 100%;
    max-width: 1100px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 48px;
    background-color: #FFFFFF !important;
    border-bottom: 1px solid var(--color-border);
}

.tabs-nav, .tabs-nav-course {
    background-color: #FFFFFF !important;
}

.logo {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.logo-optim {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

.logo-academia {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-red);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 2px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-icon {
    color: var(--color-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    box-shadow: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: #0f172a;
    transform: translateY(-1px);
}

.btn-red {
    background-color: var(--color-red);
    color: white;
    padding: 10px 24px;
}

.btn-red:hover {
    background-color: #a81c1c;
    transform: translateY(-1px);
}

/* Main Content */
.content {
    padding: 60px 48px 48px;
}

.hero {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.25;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.highlight-red {
    color: var(--color-red);
}

.highlight-blue {
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 60px;
}

.course-card {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    aspect-ratio: 16/9;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 32px;
    text-decoration: none;
    color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.course-card.bombers {
    background: url('01/01.jfif') center/cover;
}

.course-card.mossos {
    background: url('01/02.jfif') center/cover;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.2) 60%, rgba(0,0,0,0) 100%);
    z-index: 1;
}

.course-content {
    position: relative;
    z-index: 2;
}

.course-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.course-subtitle {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 24px;
}

/* Bottom Banner */
.bottom-banner {
    background-color: var(--color-bg-banner);
    border-radius: 12px;
    padding: 32px 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.banner-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.banner-features {
    display: flex;
    gap: 40px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.feature-icon {
    color: var(--color-primary);
}

.feature-text {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-primary);
    line-height: 1.3;
}

@media (max-width: 900px) {
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .bottom-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 30px;
    }
    
    .banner-features {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
}