/* =========================================================================
   1. CSS Reset & Variables
   ========================================================================= */
:root {
    /* Color Palette */
    --color-bg: #FFFFFF;
    --color-bg-light: #F9FAFB;
    --color-text: #111827;
    --color-text-muted: #4B5563;
    --color-primary: #0052FF; /* Blue CTA */
    --color-primary-hover: #0043D2;
    --color-border: #E5E7EB;
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Layout */
    --container-width: 1100px;
    --radius-md: 6px;
    --radius-lg: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =========================================================================
   2. Typography
   ========================================================================= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    line-height: 1.2;
    color: var(--color-text);
}

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

/* =========================================================================
   3. Layout & Wrappers
   ========================================================================= */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Paddings */
.py-md { padding-top: 3rem; padding-bottom: 3rem; }
.py-lg { padding-top: 5rem; padding-bottom: 5rem; }
.pt-xl { padding-top: 6rem; }
.pb-lg { padding-bottom: 4rem; }

/* Backgrounds */
.bg-light { background-color: var(--color-bg-light); }

/* =========================================================================
   4. UI Components
   ========================================================================= */

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    border-radius: var(--radius-md);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s ease, transform 0.1s ease;
    font-size: 1rem;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
}

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

.btn-lg {
    padding: 1rem 2.25rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* =========================================================================
   5. Sections
   ========================================================================= */

/* Hero Section */
.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.25rem);
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto 2.5rem auto;
}

/* Problem Section */
.problem-content {
    max-width: 700px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    letter-spacing: -0.02em;
    margin-bottom: 2rem;
}

.problem-list {
    list-style: none;
    text-align: left;
    display: inline-block;
    margin: 0 auto;
}

.problem-list li {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    padding-left: 2rem;
    position: relative;
    font-weight: 500;
    color: var(--color-text);
}

.problem-list li::before {
    content: "•";
    color: var(--color-primary);
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -4px;
}

/* How It Works Section */
.steps-grid {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    margin-top: 3rem;
}

.step-card {
    flex: 1;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: #FFFFFF;
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 800;
    margin: 0 auto 1.5rem auto;
}

.step-card p {
    font-size: 1.125rem;
    font-weight: 600;
}

/* Demo Section */
.video-placeholder {
    width: 100%;
    max-width: 800px;
    aspect-ratio: 16 / 9;
    margin: 0 auto;
    border: 2px dashed #CBD5E1;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg);
}

.video-placeholder p {
    color: var(--color-text-muted);
    font-weight: 600;
}

/* Beta Access Section */
.beta-content {
    max-width: 700px;
    margin: 0 auto;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
}

/* Contact Form Section */
.contact-box {
    max-width: 500px;
    margin: 0 auto;
    background: var(--color-bg);
    padding: 3rem 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    border: 1px solid var(--color-border);
}

.contact-form {
    text-align: left;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-text);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 82, 255, 0.1);
}

/* Footer Section */
.footer p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* =========================================================================
   6. Media Queries (Mobile Responsiveness)
   ========================================================================= */
@media (max-width: 768px) {
    .steps-grid {
        flex-direction: column;
    }

    .contact-box {
        padding: 2rem 1.5rem;
    }
}