:root {
    --bg-color: #0c0c0e;
    --surface-color: #141417;
    --surface-border: #232328;
    --text-primary: #f4f4f6;
    --text-secondary: #9a9a9f;
    --accent-color: #d4af37;
    --accent-hover: #e5c158;
    --danger-color: #8b3a3a;
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --max-width: 720px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    padding: clamp(1rem, 3vw, 2rem) 1rem;
    display: flex;
    justify-content: center;
    position: relative;
}

body::before {
    content: "";
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 450px;
    height: 450px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100' fill='none' stroke='%23d4af37' stroke-width='1.2' stroke-linecap='round'%3E%3Cpath d='M50 15 L85 75 L15 75 Z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    opacity: 0.06;
    pointer-events: none;
    z-index: 0;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    position: relative;
    z-index: 1;
}

header {
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--surface-border);
    padding-bottom: 1.5rem;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-tabs {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.nav-tabs a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
    cursor: pointer;
}

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

section {
    margin-bottom: 3.5rem;
}

h1 {
    font-size: clamp(1.8rem, 4vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    line-height: 1.2;
}

h2 {
    font-size: clamp(1.2rem, 3vw, 1.35rem);
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    border-left: 3px solid var(--accent-color);
    padding-left: 0.75rem;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-size: clamp(0.98rem, 2vw, 1.05rem);
}

.lead {
    font-size: clamp(1.05rem, 2.5vw, 1.15rem);
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.card {
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    padding: 1.75rem;
    margin-bottom: 1.5rem;
}

ul {
    list-style: none;
    margin-bottom: 1.25rem;
}

ul li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

ul li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

ul li strong {
    color: var(--text-primary);
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

@media (min-width: 600px) {
    .comparison-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.comparison-card {
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    padding: 1.5rem;
    text-align: center;
}

.fan-canvas {
    width: 100%;
    height: 220px;
    background-color: #121216;
    border: 1px solid var(--surface-border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    position: relative;
    overflow: hidden;
}

.fan-canvas svg {
    max-height: 190px;
    width: auto;
}

.comparison-card h3 {
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.comparison-card p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

.cta-box {
    background-color: var(--surface-color);
    border: 1px solid var(--accent-color);
    border-radius: 6px;
    padding: 2rem;
    text-align: center;
    margin-top: 3rem;
}

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

.btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--bg-color);
    font-weight: 600;
    padding: 0.75rem 2rem;
    border-radius: 4px;
    text-decoration: none;
    margin-top: 1rem;
    transition: background-color 0.2s ease;
    cursor: pointer;
    border: none;
}

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

.immersive-portal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-color);
    z-index: 2000;
    flex-direction: column;
    overflow-y: auto;
}

.immersive-portal.active {
    display: flex;
}

.portal-header {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1rem 1.5rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--surface-border);
}

.portal-title {
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-color);
    font-weight: 600;
}

.portal-exit {
    background: none;
    border: 1px solid var(--surface-border);
    color: var(--text-secondary);
    padding: 0.4rem 1rem;
    border-radius: 4px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.portal-exit:hover {
    border-color: var(--accent-color);
    color: var(--text-primary);
}

.portal-body {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    flex: 1;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.portal-feed {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.portal-message {
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    padding: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.6;
}

.portal-message.system {
    border-left: 3px solid var(--accent-color);
    color: var(--text-primary);
}

.portal-message.user {
    background-color: #121216;
    border-color: var(--accent-color);
    color: var(--text-primary);
    align-self: flex-end;
    width: 85%;
}

.portal-input-container {
    position: sticky;
    bottom: 0;
    background-color: var(--bg-color);
    padding: 1rem 0 2rem 0;
    border-top: 1px solid var(--surface-border);
    display: flex;
    gap: 0.75rem;
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

.portal-textarea {
    flex: 1;
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    padding: 0.85rem 1rem;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-main);
    resize: none;
    height: 54px;
    outline: none;
}

.portal-textarea:focus {
    border-color: var(--accent-color);
}

.portal-submit {
    background-color: var(--accent-color);
    color: var(--bg-color);
    font-weight: 600;
    border: none;
    border-radius: 6px;
    padding: 0 1.75rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

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

footer {
    border-top: 1px solid var(--surface-border);
    padding-top: 2rem;
    margin-top: 4rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

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

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

.pricing-tag {
    font-family: monospace;
    color: var(--accent-color);
}