/* CSS Custom Properties */
:root {
    --bg-dark: #0d0d0d;
    --bg-card: #1a1a1a;
    --bg-elevated: #252525;
    --accent-orange: #F5A623;
    --accent-yellow: #FFD93D;
    --accent-red: #FF6B00;
    --gradient: linear-gradient(135deg, #F5A623 0%, #FF6B00 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(245, 166, 35, 0.1) 0%, rgba(255, 107, 0, 0.1) 100%);
    --text-primary: #ffffff;
    --text-muted: #888888;
    --text-dim: #555555;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --border-radius: 12px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3 {
    font-weight: 700;
    line-height: 1.2;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    text-align: center;
    margin-bottom: 3rem;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding: 2rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 50% 0%, rgba(245, 166, 35, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(255, 107, 0, 0.1) 0%, transparent 40%),
        radial-gradient(ellipse at 20% 80%, rgba(255, 217, 61, 0.08) 0%, transparent 40%);
    animation: pulse 8s ease-in-out infinite alternate;
}

@keyframes pulse {
    0% { opacity: 0.8; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.05); }
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    font-weight: 400;
}

/* CTA Button */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--gradient);
    color: var(--bg-dark);
    font-size: 1.1rem;
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 20px rgba(245, 166, 35, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(245, 166, 35, 0.4);
}

.cta-button.large {
    font-size: 1.25rem;
    padding: 1.25rem 2.5rem;
}

.cta-button svg {
    transition: transform var(--transition);
}

.cta-button:hover svg {
    transform: translateY(2px);
}

/* Features Section */
.features {
    padding: 6rem 0;
    background: var(--bg-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(245, 166, 35, 0.2);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

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

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* How It Works Section */
.how-it-works {
    padding: 6rem 0;
    background: var(--gradient-subtle);
}

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

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    color: var(--bg-dark);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.step h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

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

/* Demo Section - M4L Device Frame */
.demo {
    padding: 6rem 0;
    background: var(--bg-dark);
}

.device-frame {
    max-width: 580px;
    margin: 0 auto;
    background: #1a1a1a;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.device-header {
    background: #2d2d2d;
    padding: 6px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.device-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-orange);
}

.device-title {
    color: #a0a0a0;
    font-size: 13px;
    font-weight: 500;
}

.device-controls {
    margin-left: auto;
    display: flex;
    gap: 10px;
}

.device-icon {
    color: #707070;
    font-size: 14px;
    cursor: default;
}

.device-main {
    display: flex;
}

.device-left {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.device-chat {
    flex: 1;
    padding: 0;
    display: flex;
    flex-direction: column;
    background: #1a1a1a;
}

.chat-line {
    padding: 8px 12px;
    line-height: 1.5;
    font-size: 13px;
}

.chat-line.user-msg {
    background: #2a2a2a;
    border-left: 2px solid #3a3a3a;
}

.chat-line.ai-msg {
    background: #1a1a1a;
}

.chat-label {
    font-weight: 600;
}

.chat-label.user {
    color: var(--accent-orange);
}

.chat-label.ai {
    color: #5ac8fa;
}

.chat-text {
    color: #d0d0d0;
}

.device-input {
    display: flex;
    background: #111;
    border-top: 1px solid #333;
    height: 36px;
}

.input-area {
    flex: 1;
    padding: 0 12px;
    display: flex;
    align-items: center;
}

.input-prompt {
    color: #505050;
    font-size: 14px;
}

.input-submit {
    width: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-left: 1px solid #333;
}

.device-sidebar {
    width: 36px;
    background: #222;
    display: flex;
    flex-direction: column;
    border-left: 1px dotted #444;
}

.sidebar-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #808080;
    font-size: 14px;
    font-weight: 500;
    cursor: default;
}

/* Download Section */
.download {
    padding: 6rem 0;
    text-align: center;
    background: var(--gradient-subtle);
}

.requirements {
    margin-top: 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Footer */
.footer {
    padding: 3rem 0;
    background: var(--bg-card);
    border-top: 1px solid var(--bg-elevated);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.github-link:hover {
    color: var(--accent-orange);
}

.made-by {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.made-by a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition);
}

.made-by a:hover {
    color: var(--accent-orange);
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        min-height: 90vh;
    }

    .features-grid,
    .steps {
        grid-template-columns: 1fr;
    }

    .feature-card,
    .step {
        padding: 1.5rem;
    }

    .device-frame {
        margin: 0 -12px;
        border-radius: 0;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title,
.hero-subtitle,
.cta-button {
    animation: fadeInUp 0.8s ease-out forwards;
}

.hero-subtitle {
    animation-delay: 0.2s;
}

.hero .cta-button {
    animation-delay: 0.4s;
}

/* Selection styling */
::selection {
    background: rgba(245, 166, 35, 0.3);
    color: var(--text-primary);
}