/* ============================================
   CSS Reset & Base Styles
   ============================================ */

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

:root {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;
    --text-primary: #f0f0f0;
    --text-secondary: #a8a8a8;
    --text-tertiary: #6a6a6a;

    /* Accent Colors - Blue shades */
    --accent-primary: #4a9eff;
    --accent-secondary: #2563eb;
    --accent-tertiary: #60a5fa;

    /* Grid Lines */
    --grid-line: #1a1a1a;
    --grid-line-strong: #2a2a2a;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Typography */
    --font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.8rem;
    --font-size-sm: 0.925rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.75rem;
    --font-size-2xl: 2.5rem;
    --font-size-3xl: 3.5rem;

    /* Effects */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.7);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

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

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

h1 {
    font-size: var(--font-size-3xl);
}

h2 {
    font-size: var(--font-size-2xl);
}

h3 {
    font-size: var(--font-size-xl);
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

/* ============================================
   Container & Layout
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

/* ============================================
   Navigation
   ============================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--grid-line-strong);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.nav-links a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-links .cta-button {
    background: var(--accent-primary);
    color: white;
    border: 1px solid var(--accent-primary);
}

.nav-links .cta-button:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

/* ============================================
   Buttons
   ============================================ */

.cta-button,
.primary-button,
.secondary-button,
.submit-button {
    padding: 0.75rem 1.75rem;
    border-radius: 0;
    font-weight: 500;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    display: inline-block;
}

.cta-button,
.primary-button,
.submit-button {
    background: var(--accent-primary);
    color: white;
    border: 1px solid var(--accent-primary);
}

.cta-button:hover,
.primary-button:hover,
.submit-button:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
    transform: translateY(-1px);
}

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

.secondary-button:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    overflow: hidden;
    background:
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
        linear-gradient(0deg, var(--grid-line) 1px, transparent 1px);
    background-size: 50px 50px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(74, 158, 255, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.gradient-text {
    color: var(--accent-primary);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
}

.scroll-indicator svg {
    opacity: 0.5;
}

/* ============================================
   Section Headers
   ============================================ */

.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-header.centered {
    text-align: center;
}

.section-label {
    display: inline-block;
    color: var(--accent-secondary);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 500;
    margin-bottom: 0;
}

/* ============================================
   Feature Sections
   ============================================ */

.feature-section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--grid-line);
}

.feature-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.feature-content.reverse {
    direction: rtl;
}

.feature-content.reverse > * {
    direction: ltr;
}

.feature-text {
    max-width: 600px;
}

.feature-description {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.large-text {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    font-weight: 400;
    line-height: 1.6;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.feature-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-left: 2px solid var(--accent-primary);
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
}

.feature-item:hover {
    background: var(--bg-tertiary);
    border-left-color: var(--accent-secondary);
    padding-left: 1.25rem;
}

/* ============================================
   Visual Placeholders
   ============================================ */

.feature-visual {
    position: relative;
}

.visual-placeholder {
    background: transparent;
    border-radius: 0;
    padding: var(--spacing-sm);
    border: 2px solid var(--grid-line-strong);
    overflow: hidden;
}

.interface-screenshot {
    width: 100%;
    height: auto;
    border-radius: 0;
    display: block;
    border: 1px solid var(--accent-primary);
}

/* Waveform Demo Specific */
.waveform-section .visual-placeholder {
    background: transparent;
    border: none;
}

.demo-canvas {
    background: var(--bg-primary);
    border-radius: 0;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--grid-line-strong);
}

.waveform-svg {
    width: 100%;
    height: auto;
}

.demo-caption {
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
}

/* ============================================
   Integration/Feedback Loop Section
   ============================================ */

.integration-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--grid-line-strong);
    border-bottom: 1px solid var(--grid-line-strong);
}

.integration-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.integration-text {
    max-width: 800px;
    margin: 0 auto;
}

.highlight {
    color: var(--text-primary);
    font-weight: 400;
    font-size: var(--font-size-lg);
    text-align: center;
    padding: var(--spacing-md) 0;
    background: transparent;
    border-radius: 0;
    border-top: 1px solid var(--grid-line-strong);
    border-bottom: 1px solid var(--grid-line-strong);
}

/* ============================================
   Use Cases Section
   ============================================ */

.use-cases-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: var(--spacing-lg);
    border-top: 1px solid var(--grid-line-strong);
}

.use-case-card {
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--grid-line-strong);
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-lg);
    align-items: start;
    transition: all var(--transition-fast);
}

.use-case-card:hover {
    padding-left: var(--spacing-sm);
}

.use-case-card h3 {
    margin-bottom: 0;
    color: var(--accent-primary);
    font-size: var(--font-size-lg);
}

.card-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.card-list li {
    color: var(--text-secondary);
    padding-left: var(--spacing-md);
    position: relative;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.card-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--text-tertiary);
}

/* ============================================
   Technical Specs Section
   ============================================ */

.specs-section {
    background: var(--bg-secondary);
}

.specs-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: var(--spacing-lg);
    border-top: 1px solid var(--grid-line-strong);
}

.spec-category {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--grid-line-strong);
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.spec-category h3 {
    color: var(--accent-secondary);
    margin-bottom: 0;
    font-size: var(--font-size-md);
    font-weight: 600;
}

.spec-category p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
    font-size: var(--font-size-sm);
}

/* ============================================
   Research Section
   ============================================ */

.research-section {
    padding: var(--spacing-xl) 0;
    text-align: center;
    background: var(--bg-primary);
    border-top: 1px solid var(--grid-line-strong);
    border-bottom: 1px solid var(--grid-line-strong);
}

.research-content {
    max-width: 700px;
    margin: 0 auto;
}

.research-subtitle {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    margin: var(--spacing-md) 0;
    line-height: 1.8;
}

.research-cta {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.research-note {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin: 0;
}

/* ============================================
   Access/CTA Section
   ============================================ */

.access-section {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.access-content {
    max-width: 600px;
    margin: 0 auto;
}

.access-content h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-md);
}

.access-subtitle {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.access-form {
    margin-top: var(--spacing-lg);
}

.form-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.email-input {
    flex: 1;
    padding: 0.75rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--grid-line-strong);
    border-radius: 0;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    transition: border-color var(--transition-fast);
}

.email-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.email-input::placeholder {
    color: var(--text-tertiary);
}

.form-disclaimer {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin: 0;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--grid-line-strong);
    padding: var(--spacing-lg) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand h3 {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column h4 {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
    color: var(--accent-secondary);
}

.footer-column a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--grid-line);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
    margin: 0;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --spacing-xl: 4rem;
    }

    .feature-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .feature-content.reverse {
        direction: ltr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 3rem;
    }

    .nav-container {
        padding: var(--spacing-sm);
    }

    .logo {
        font-size: var(--font-size-md);
    }

    .nav-links {
        gap: var(--spacing-xs);
        font-size: var(--font-size-xs);
    }

    .nav-links a {
        padding: 0.5rem 0.75rem;
    }

    .cta-button,
    .primary-button,
    .secondary-button,
    .submit-button {
        padding: 0.5rem 1rem;
        font-size: var(--font-size-xs);
    }

    .hero {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

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

    .use-case-card {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .spec-category {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        flex-direction: column;
    }

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

@media (max-width: 480px) {
    .nav-container {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .logo {
        flex: 1;
    }

    .nav-links {
        flex-basis: 100%;
        justify-content: space-between;
        gap: var(--spacing-xs);
    }

    .nav-links a {
        flex: 1;
        text-align: center;
        padding: 0.6rem 0.5rem;
        font-size: 0.75rem;
    }

    .scroll-indicator {
        display: none;
    }
}

/* ============================================
   Utilities
   ============================================ */

html {
    scroll-padding-top: 80px;
}