/* CSS Variables */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a24;
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.2);
    --border: #2a2a35;
    --gradient-start: #6366f1;
    --gradient-end: #8b5cf6;
    --card-bg: rgba(26, 26, 36, 0.6);
    --card-border: rgba(255, 255, 255, 0.08);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
}

/* Typography */
h1, h2, h3 {
    line-height: 1.2;
    font-weight: 600;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
}

/* Layout */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 5rem 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

/* Cards */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    border-color: rgba(99, 102, 241, 0.3);
}

.card h3 {
    margin-bottom: 0.75rem;
}

.card-icon {
    color: var(--accent);
    margin-bottom: 1rem;
}

/* Hero Section */
.hero {
    padding: 8rem 0 6rem;
    text-align: center;
    background: radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent);
}

.hero h1 {
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 2.5rem;
    color: var(--text-secondary);
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Problem Section */
.problem {
    background: var(--bg-secondary);
}

.problem h2 {
    text-align: center;
}

/* Solution Section */
.solution h2 {
    text-align: center;
}

.solution-bonus {
    text-align: center;
    margin-top: 3rem;
    font-size: 1.125rem;
    color: var(--text-muted);
    font-style: italic;
}

/* How It Works Section */
.how-it-works {
    background: var(--bg-secondary);
}

.how-it-works h2 {
    text-align: center;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.step {
    position: relative;
    padding-left: 4rem;
}

.step-number {
    position: absolute;
    left: 0;
    top: 0;
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: white;
}

.step h3 {
    margin-bottom: 0.5rem;
}

.how-closing {
    text-align: center;
    margin-top: 3rem;
    font-size: 1.125rem;
    color: var(--accent);
    font-weight: 500;
}

/* Who It's For Section */
.who-its-for h2 {
    text-align: center;
}

.who-closing {
    text-align: center;
    margin-top: 3rem;
    font-size: 1.125rem;
    color: var(--text-muted);
}

/* Open Source Section */
.open-source {
    background: var(--bg-secondary);
}

.open-source h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

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

.pro-teaser {
    text-align: center;
    margin-top: 3rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    color: var(--text-muted);
}

/* Waitlist Section */
.waitlist {
    text-align: center;
    padding: 6rem 0;
    background: radial-gradient(ellipse 80% 50% at 50% 100%, var(--accent-glow), transparent);
}

.waitlist h2 {
    margin-bottom: 1rem;
}

.waitlist-sub {
    max-width: 500px;
    margin: 0 auto 2.5rem;
}

.waitlist-form {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    max-width: 500px;
    margin: 0 auto;
}

.waitlist-form input[type="email"] {
    flex: 1;
    min-width: 250px;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s ease;
}

.waitlist-form input[type="email"]::placeholder {
    color: var(--text-muted);
}

.waitlist-form input[type="email"]:focus {
    border-color: var(--accent);
}

.waitlist-alt {
    margin-top: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 1rem;
}

.social-links a {
    color: var(--text-secondary);
    transition: color 0.2s ease, transform 0.2s ease;
}

.social-links a:hover {
    color: var(--accent);
    transform: scale(1.1);
}

.testimonial {
    margin-top: 3rem;
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    section {
        padding: 3.5rem 0;
    }

    .hero {
        padding: 5rem 0 4rem;
    }

    .hero-sub {
        font-size: 1.1rem;
    }

    .step {
        padding-left: 3.5rem;
    }

    .step-number {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

    .cards {
        gap: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    .waitlist-form {
        flex-direction: column;
    }

    .waitlist-form input[type="email"] {
        min-width: 100%;
    }

    .waitlist-form .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.35rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-cta .btn {
        width: 100%;
    }
}