:root {
    --md-primary: #1a73e8;
    --md-on-primary: #ffffff;
    --md-surface: #ffffff;
    --md-background: #f8f9fa;
    --md-text: #202124;
    --md-text-secondary: #5f6368;
    --md-shadow-1: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
    --md-shadow-2: 0 1px 3px 0 rgba(60,64,67,0.3), 0 4px 8px 3px rgba(60,64,67,0.15);
    --md-shadow-3: 0 4px 4px 0 rgba(60,64,67,0.3), 0 8px 12px 6px rgba(60,64,67,0.15);
    --transition-standard: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--md-text);
    background-color: var(--md-surface);
    line-height: 1.6;
}

/* Estilos para a seção hero */
.hero {
    padding-top: 120px;
    padding-bottom: 60px;
    min-height: 85vh;
    display: flex;
    align-items: center;
    background: radial-gradient(circle at top right, rgba(26, 115, 232, 0.05), transparent);
}

h1, h2, h3, .display-4, .display-5 {
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--md-text);
}

.lead {
    color: var(--md-text-secondary);
    font-weight: 400;
}

/* Animações de fade-in */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-standard);
}

.fade-in.visible { /* This class will be added by JS potentially, or we can use the existing observer logic */
    opacity: 1;
    transform: translateY(0);
}

/* Base fade-in fallback if JS fails or for simplicity */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Navbar */
.navbar {
    padding: 1rem 0;
    transition: var(--transition-standard);
    background-color: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(10px);
}

.navbar-brand img {
    height: 48px;
    width: auto;
    transition: var(--transition-standard);
}

.nav-link {
    font-weight: 500;
    color: var(--md-text-secondary) !important;
    margin: 0 10px;
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--md-primary) !important;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--md-primary);
    border-radius: 2px;
}

/* Feature Cards */
.feature-card {
    padding: 2.5rem;
    border-radius: 16px;
    background: var(--md-surface);
    box-shadow: var(--md-shadow-1);
    transition: var(--transition-standard);
    border: 1px solid rgba(0,0,0,0.05);
    height: 100%;
}

#daily-photo {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: 16px;
    box-shadow: var(--md-shadow-2);
}

.feature-card:hover {
    box-shadow: var(--md-shadow-2);
    transform: translateY(-5px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: rgba(26, 115, 232, 0.1);
    color: var(--md-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: var(--transition-standard);
    text-transform: none;
    letter-spacing: 0.01em;
}

.btn-primary {
    background-color: var(--md-primary);
    border: none;
    box-shadow: var(--md-shadow-1);
}

.btn-primary:hover {
    background-color: #1557b0;
    box-shadow: var(--md-shadow-2);
}

/* Stats Cards */
.bg-white.rounded-3.shadow-sm {
    border-radius: 16px !important;
    box-shadow: var(--md-shadow-1) !important;
    transition: var(--transition-standard);
}

.bg-white.rounded-3.shadow-sm:hover {
    box-shadow: var(--md-shadow-2) !important;
}

.stats-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--md-primary);
}

/* Video Ratio */
.ratio {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--md-shadow-3) !important;
}

/* Section Spacing */
.section {
    padding: 100px 0;
}

/* Footer Improvements */
.footer {
    border-top: 1px solid rgba(0,0,0,0.05);
}

/* Focus states for accessibility */
a:focus, button:focus {
    outline: 2px solid var(--md-primary);
    outline-offset: 4px;
}

@media (max-width: 991px) {
    .hero {
        text-align: center;
        padding-top: 100px;
    }
    .hero .d-flex {
        justify-content: center;
    }
}