:root {
    --bg: #1a1a2e;
    --bg-secondary: #16213e;
    --text: #eaeaea;
    --text-muted: #a0a0a0;
    --accent: #0f9d58;
    --accent-hover: #0d8c4d;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    background: var(--bg-secondary);
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
}

.nav-links a:hover { color: var(--accent); }

/* Hamburger button - hidden on desktop */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s;
}

/* Hamburger animation when active */
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        gap: 0;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .nav-links.active {
        max-height: 400px;
    }

    .nav-links li {
        border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .nav-links a {
        display: block;
        padding: 1rem 1.5rem;
    }

    .navbar .container {
        position: relative;
    }
}

/* Hero */
.hero {
    padding: 0 0 2rem 0;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.hero-image {
    width: 100%;
    max-width: 200px;
    flex-shrink: 0;
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
}

.hero-text {
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin: 0.5rem 0 1rem;
}

/* Desktop: side-by-side layout */
@media (min-width: 768px) {
    .hero {
        padding: 0 0 2rem 0;
    }

    .hero-content {
        flex-direction: row;
        gap: 3rem;
        align-items: center;
    }

    .hero-image {
        max-width: 250px;
    }

    .hero-text {
        text-align: left;
        flex: 1;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .tagline {
        font-size: 1.5rem;
    }
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.feature {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.feature-icon {
    display: block;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1;
}

.feature h3 {
    color: var(--accent);
    margin-bottom: 0.5rem;
}

/* Content */
main {
    min-height: calc(100vh - 200px);
    padding: 4rem 0 2rem;
}

article h1 { margin-bottom: 1.5rem; }

article p, article ul, article ol {
    margin-bottom: 1rem;
}

article code {
    background: var(--bg-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}

article pre {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1rem;
}

article pre code {
    background: none;
    padding: 0;
}

/* Story-specific code block constraints */
.story pre {
    max-width: 100%;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.story code {
    word-break: break-word;
    overflow-wrap: break-word;
}

/* Chat Animation Controls */
.chat-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border-radius: 8px 8px 0 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.chat-btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.chat-btn:hover {
    background: var(--accent-hover);
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: auto;
}

.speed-slider {
    width: 80px;
    cursor: pointer;
}

.speed-value {
    width: 2rem;
}

/* Typing cursor effect */
.story-turn.typing::after {
    content: "▋";
    animation: blink 0.7s infinite;
    color: var(--accent);
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Action/status messages */
.action {
    display: inline-block;
    background: rgba(135, 105, 247, 0.15);
    border-left: 3px solid #8769f7;
    padding: 0.5rem 1rem;
    margin: 0.75rem 0;
    border-radius: 0 6px 6px 0;
    font-style: italic;
    color: #b8a5ff;
}

/* Insight boxes */
.insight {
    background: linear-gradient(135deg, rgba(15, 157, 88, 0.15), rgba(15, 157, 88, 0.05));
    border: 1px solid var(--accent);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    margin: 1rem 0;
    position: relative;
}

.insight::before {
    content: "★ Insight";
    display: block;
    font-weight: bold;
    color: var(--accent);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* Conversation Story Styling */
.story {
    background: var(--bg-secondary);
    border-radius: 0 0 8px 8px;
    padding: 1.5rem;
    margin: 0 0 1.5rem 0;
    height: 60vh;
    min-height: 400px;
    max-height: 600px;
    max-width: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

@media (max-width: 768px) {
    .story {
        height: 70vh;
        min-height: 300px;
        max-height: none;
        padding: 1rem;
    }

    .chat-controls {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .speed-control {
        width: 100%;
        margin-left: 0;
        margin-top: 0.5rem;
    }

    /* Ensure code blocks respect viewport on mobile */
    article pre {
        max-width: 100%;
        overflow-x: auto;
        font-size: 0.8em;
    }

    article code {
        word-break: break-word;
        overflow-wrap: break-word;
    }

    /* Story code blocks - even more constrained on mobile */
    .story pre {
        font-size: 0.75em;
        padding: 0.75rem;
        white-space: pre-wrap;
    }

    .story-turn pre {
        margin-left: 0;
        margin-right: 0;
    }
}

.story-turn {
    margin-bottom: 1rem;
    padding: 1rem;
    border-radius: 6px;
}

.story-turn.user {
    background: rgba(15, 157, 88, 0.1);
    border-left: 3px solid var(--accent);
}

.story-turn.assistant {
    background: rgba(255,255,255,0.05);
    border-left: 3px solid var(--text-muted);
}

.story-turn .role {
    font-weight: bold;
    font-size: 0.85rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

.story-turn.user .role { color: var(--accent); }

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Page list */
.page-list {
    list-style: none;
}

.page-list li {
    padding: 0.5rem 0;
}

.page-list a {
    color: var(--accent);
    text-decoration: none;
}

.page-list a:hover {
    text-decoration: underline;
}

/* Demo grid layout */
.demo-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.demo-session {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1.5rem;
}

.demo-session h3 {
    color: var(--accent);
    margin-top: 0;
    margin-bottom: 0.75rem;
}

.demo-session > p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}