/**
 * Main Application Styles
 */

/* Header */
.app-header {
    background-color: var(--color-neutral-0);
    border-bottom: 1px solid var(--color-neutral-30);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-email {
    font-size: var(--font-size-sm);
    color: var(--color-neutral-70);
}

/* Footer */
.app-footer {
    background-color: var(--color-neutral-100);
    color: var(--color-neutral-0);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--color-neutral-60);
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--color-neutral-0);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-neutral-80);
    text-align: center;
    color: var(--color-neutral-60);
}

/* Landing Page */
.landing-page {
    min-height: calc(100vh - 64px);
}

.hero {
    text-align: center;
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-neutral-0);
}

.hero h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}

.tagline {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.features {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.features h2 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background-color: var(--color-neutral-0);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.join-session {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background-color: var(--color-neutral-20);
    text-align: center;
}

.join-session h2 {
    margin-bottom: var(--spacing-xl);
}

.join-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    max-width: 500px;
    margin: 0 auto;
}

.join-form input {
    width: 100%;
}

/* Auth Pages */
.auth-container {
    min-height: calc(100vh - 64px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    background-color: var(--color-neutral-20);
}

.auth-card {
    width: 100%;
    max-width: 450px;
}

.auth-card .card-header {
    text-align: center;
}

.auth-card h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.auth-links {
    text-align: center;
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

/* Dashboard */
.dashboard {
    padding: var(--spacing-2xl) 0;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
}

.presentation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.presentation-card {
    cursor: pointer;
    transition: transform var(--transition-base);
}

.presentation-card:hover {
    transform: translateY(-2px);
}

.presentation-card .card-header h3 {
    margin: 0;
}

.presentation-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-neutral-70);
    margin-top: var(--spacing-sm);
}

.presentation-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.presentation-actions-line {
    display: flex;
    width: 100%;
}

.presentation-actions-line > .button {
    justify-content: center;
}

.presentation-actions-secondary {
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--color-neutral-30, #e0e0e0);
    margin-top: var(--spacing-xs);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        height: auto;
        padding: var(--spacing-md) 0;
    }

    .main-nav {
        flex-direction: column;
        width: 100%;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .presentation-grid {
        grid-template-columns: 1fr;
    }
}

/* Utility classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden { display: none !important; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }