:root {
    --bg-dark: #121212; --bg-light: #1E1E1E; --bg-panel: #2A2A2A;
    --border-color: #3A3A3A; --text-primary: #E0E0E0; --text-secondary: #A0A0A0;
    --accent-primary: #007BFF; --accent-session: #FCA311; --accent-jwt: #147DF5;
    --accent-oauth: #28A745; --font-sans: 'Inter', sans-serif; --font-mono: 'Fira Code', monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-sans); background-color: var(--bg-dark); color: var(--text-primary); overflow: hidden; }
.container { display: flex; height: 100vh; }
.sidebar { width: 260px; background-color: var(--bg-light); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; padding: 1.5rem; }
.logo { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 2.5rem; color: #fff; }
nav { display: flex; flex-direction: column; gap: 0.5rem; }
.nav-link { display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem; border-radius: 6px; text-decoration: none; color: var(--text-secondary); font-weight: 500; transition: background-color 0.2s ease, color 0.2s ease; }
.nav-link:hover { background-color: var(--bg-panel); color: var(--text-primary); }
.nav-link.active { background-color: var(--accent-primary); color: #fff; }
.footer { margin-top: auto; font-size: 0.8rem; color: var(--text-secondary); text-align: center; }
.main-content { flex: 1; padding: 2rem; overflow-y: auto; }
.demo-title h1 { font-size: 2.5rem; margin-bottom: 0.5rem; color: #fff; }
.demo-title p { font-size: 1.1rem; color: var(--text-secondary); max-width: 800px; margin-bottom: 2rem; }

/* --- NEW & UPDATED STYLES FOR TUTORIALS --- */
.tutorial-stage { display: flex; flex-direction: column; gap: 1.5rem; }
.tutorial-controls { display: flex; align-items: center; gap: 1rem; padding: 1rem; background-color: var(--bg-light); border-radius: 8px; border: 1px solid var(--border-color); }
.tutorial-controls h3 { margin-right: auto; }
.tutorial-controls button { width: auto; padding: 0.5rem 1.5rem; font-size: 0.9rem; }
.tutorial-controls button:disabled { background-color: #444; color: #888; cursor: not-allowed; }
.live-status { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.status-box { background: var(--bg-light); padding: 1rem; border-radius: 8px; border: 1px solid var(--border-color); }
.status-box h4 { margin-bottom: 0.5rem; color: var(--text-secondary); display: flex; align-items: center; gap: 0.5rem; }
.status-box pre { background-color: var(--bg-dark); padding: 0.5rem; font-size: 0.9rem; color: var(--accent-session); }
.status-box pre#live-localstorage-status { color: var(--accent-jwt); }

.tutorial-grid { display: grid; grid-template-columns: 1fr 150px 1fr; gap: 1rem; }
.browser-pane, .server-pane { background-color: var(--bg-panel); border: 1px solid var(--border-color); border-radius: 8px; padding: 1rem; display: flex; flex-direction: column; gap: 1rem; }
.pane-header { display: flex; align-items: center; gap: 0.5rem; font-weight: bold; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border-color); }
.browser-pane .pane-header { color: var(--accent-jwt); }
.server-pane .pane-header { color: var(--accent-session); }
.tutorial-step-pane {
    font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.6;
    background-color: var(--bg-light); border: 1px solid var(--border-color);
    padding: 1rem; border-radius: 6px; white-space: pre-wrap;
    opacity: 1; transition: opacity 0.5s ease;
}
.tutorial-step-pane.hidden { opacity: 0; }

.communication-pane { position: relative; }
#communication-lane {
    position: absolute; width: 100%; top: 50%;
    background-image: linear-gradient(var(--border-color) 2px, transparent 0);
    background-size: 100% 20px; background-position: center;
}
.packet {
    position: absolute; left: 50%; transform: translateX(-50%);
    background-color: var(--bg-panel); border: 1px solid var(--border-color);
    padding: 0.5rem 1rem; border-radius: 4px; font-family: var(--font-mono);
    font-size: 0.8rem; white-space: pre;
    transition: transform 1.8s ease-in-out; /* MEDIUM-SLOW ANIMATION */
    z-index: 10;
}
.client-packet { border-color: var(--accent-jwt); }
.server-packet { border-color: var(--accent-session); }

/* Other page styles (unchanged but included for completeness) */
.view-container h1 { font-size: 2.5rem; margin-bottom: 0.5rem; color: #fff; }
.subtitle { font-size: 1.1rem; color: var(--text-secondary); max-width: 700px; margin-bottom: 3rem; }
.card-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.card { background-color: var(--bg-light); border: 1px solid var(--border-color); border-radius: 8px; padding: 1.5rem; text-decoration: none; transition: transform 0.2s ease, box-shadow 0.2s ease; }
.card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.2); }
.card h3 { color: #fff; margin-bottom: 0.5rem; }
.card p { color: var(--text-secondary); line-height: 1.5; }
.card.session-card { border-top: 4px solid var(--accent-session); }
.card.jwt-card { border-top: 4px solid var(--accent-jwt); }
.card.oauth-card { border-top: 4px solid var(--accent-oauth); }


/* --- NEW STYLES for OAuth Page --- */
.tutorial-grid.oauth-three-column {
    grid-template-columns: 1fr 1fr 1fr; /* Override default two-column grid */
}

.tutorial-grid.oauth-three-column .browser-pane,
.tutorial-grid.oauth-three-column .server-pane {
    gap: 0.5rem; /* Tighter spacing for more text */
}

.tutorial-grid.oauth-three-column .tutorial-step-pane {
    font-size: 0.85rem; /* Smaller font to fit more text */
    line-height: 1.5;
}

.server-pane .pane-header.auth-server-header {
    color: var(--accent-oauth); /* Special color for the Auth Server */
}


/* --- FINAL POLISH STYLES for OAuth Modal --- */
.modal-overlay {
    /* Add transition for smooth fade-in/out */
    transition: opacity 0.3s ease-in-out;
}
.modal-overlay.hidden {
    /* Use opacity and pointer-events for smooth hiding */
    opacity: 0;
    pointer-events: none;
}
.modal-logo {
    width: 64px;
    height: 64px;
    color: var(--accent-oauth);
    margin-bottom: 1rem;
}
.modal-actions button {
    flex: 1; /* Make buttons equal width */
}