:root {
    --bg-color: #0f1016;
    --surface-color: rgba(255, 255, 255, 0.03);
    --surface-hover: rgba(255, 255, 255, 0.06);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f2f2f2;
    --text-secondary: #8a8f98;
    --accent-primary: #7b68ee;
    --accent-hover: #9370db;
    --glow-color: rgba(123, 104, 238, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Abstract ambient background glow */
.ambient-glow {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80vw;
    height: 60vh;
    background: radial-gradient(ellipse at top, var(--glow-color) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 16, 22, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

nav .logo {
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    /* gap: 0.5rem; */
    letter-spacing: -0.02em;
}

nav .logo span {
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav a:not(.logo) {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

nav a:not(.logo):hover {
    color: var(--text-primary);
}

.hero {
    padding: 10rem 2rem 6rem;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(180deg, #fff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero .tagline {
    color: var(--text-secondary);
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 2.5rem;
    font-weight: 400;
}

.enter-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-decoration: none;
    padding: 0.875rem 2.5rem;
    background: var(--accent-primary);
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
    box-shadow: 0 0 0 1px rgba(123, 104, 238, 0.5), 0 4px 14px rgba(123, 104, 238, 0.4);
}

.enter-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 0 0 1px rgba(147, 112, 219, 0.5), 0 6px 20px rgba(123, 104, 238, 0.5);
}

.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--border-color) 50%, transparent 100%);
    margin: 0 auto;
    max-width: 1000px;
}

.content-section {
    padding: 6rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.use-cases {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    background: var(--surface-hover);
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(123, 104, 238, 0.1);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    border: 1px solid rgba(123, 104, 238, 0.2);
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.blog-card {
    display: flex;
    flex-direction: column;
    text-decoration: none;
}

.blog-card h3 {
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.blog-card:hover h3 {
    color: var(--accent-primary);
}

.example-container {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.message {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
}

.message:last-child {
    margin-bottom: 0;
}

.message-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.message.user .message-label {
    color: var(--text-secondary);
}

.message.ai .message-label {
    color: var(--accent-primary);
}

.message-content {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem 1.25rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.message.ai .message-content {
    background: rgba(123, 104, 238, 0.05);
    border-color: rgba(123, 104, 238, 0.1);
}

footer {
    padding: 4rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.copyright {
    color: #555;
    font-size: 0.85rem;
}

.faq-item {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: background 0.3s ease;
}

.faq-item:hover {
    background: var(--surface-hover);
}

.faq-item h3 {
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
}

.faq-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 6rem 2rem 4rem;
}

.back-link {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 2rem;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: var(--accent-primary);
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.submit-btn {
    display: block;
    width: 100%;
    padding: 1rem;
    background: var(--accent-primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s ease;
}

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

.submit-btn:disabled {
    background: var(--border-color);
    cursor: not-allowed;
}

.email-link {
    color: var(--accent-primary);
    text-decoration: none;
}

.email-link:hover {
    text-decoration: underline;
}

.error {
    color: #ff6b6b;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.success {
    color: #51cf66;
    margin-top: 1rem;
    text-align: center;
    padding: 2rem;
    background: rgba(81, 207, 102, 0.1);
    border: 1px solid rgba(81, 207, 102, 0.2);
    border-radius: 12px;
}

.success h2 {
    margin-bottom: 0.5rem;
}

.step {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-left: 4.5rem;
}

.step-num,
.step-number {
    position: absolute;
    left: 1.5rem;
    top: 1.5rem;
    width: 2rem;
    height: 2rem;
    background: var(--accent-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.step strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.step p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.95rem;
}

.info-box {
    background: rgba(123, 104, 238, 0.1);
    border: 1px solid rgba(123, 104, 238, 0.3);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
    color: var(--text-primary);
}

.cta {
    display: inline-block;
    background: var(--accent-primary);
    color: #fff;
    padding: 0.8rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    margin: 2rem 0;
    transition: background 0.2s ease;
}

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

.last-updated {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.content-section h1,
.container h1 {
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.content-section h2,
.container h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-section p,
.container p {
    margin-bottom: 1rem;
}

.content-section ul,
.container ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.content-section li,
.container li {
    margin-bottom: 0.5rem;
}

.content-section a:not(.card):not(.cta):not(.back-link),
.container a:not(.card):not(.cta):not(.back-link):not(.email-link) {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.content-section a:not(.card):not(.cta):not(.back-link):hover,
.container a:not(.card):not(.cta):not(.back-link):not(.email-link):hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.post-list {
    list-style: none;
    padding-left: 0 !important;
}

.post-list li {
    margin-bottom: 2rem !important;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.post-list li:last-child {
    border-bottom: none;
}

.post-list a {
    color: var(--text-primary) !important;
    text-decoration: none !important;
    font-size: 1.3rem;
    font-weight: 500;
}

.post-list a:hover {
    color: var(--accent-primary) !important;
}

.post-excerpt {
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-size: 0.95rem;
}

.post-date {
    color: #666;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
        /* simple mobile nav handling for now */
    }

    .hero {
        padding: 8rem 1.5rem 4rem;
    }
}