/* --- Variables & Reset --- */
:root {
    --bg-main: #ffffff;
    --bg-alt: #f9fafb;
    --text-main: #111827;
    --text-muted: #4b5563;
    
    --accent: #FFB703;
    --accent-hover: #EAA600;
    
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow-soft: 0 20px 40px -10px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* --- Typography --- */
h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

h1 span {
    color: var(--accent);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

/* --- Keyboard Keys Styling --- */
kbd {
    background-color: #f3f4f6;
    border: 1px solid #d1d5db;
    border-bottom: 3px solid #d1d5db;
    border-radius: 6px;
    padding: 0.2rem 0.5rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.9em;
    font-weight: 600;
    color: #374151;
    box-shadow: 0 1px 1px rgba(0,0,0,0.05);
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--accent);
    color: #111827; 
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -10px rgba(255, 183, 3, 0.5);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border: 2px solid #e5e7eb;
}

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

.btn-large {
    font-size: 1.25rem;
    padding: 1rem 2.5rem;
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 800;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 20px;
    height: 20px;
    background-color: var(--accent);
    border-radius: 4px;
    display: inline-block;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-cta {
    font-weight: 600;
    color: var(--text-main);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: background 0.2s;
}

.nav-cta:hover {
    background-color: var(--bg-alt);
}

/* --- Hero Section --- */
.hero {
    max-width: 1000px;
    margin: 0 auto;
    padding: 10rem 2rem 5rem;
    text-align: center;
}

.hero p {
    max-width: 600px;
    margin: 0 auto 2.5rem;
    font-size: 1.25rem;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
}

.hero-video-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    padding: 0.5rem;
    background: white;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(0,0,0,0.05);
}

.hero-video {
    width: 100%;
    border-radius: calc(var(--radius-lg) - 0.25rem);
    display: block;
    background-color: #f3f4f6; 
}

/* --- Features Section --- */
.features {
    background-color: var(--bg-alt);
    padding: 6rem 2rem;
}

.section-title {
    max-width: 800px;
    margin: 0 auto 4rem;
    text-align: center;
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-main);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0,0,0,0.02);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-soft);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background-color: #FFF8E6; 
    border-radius: 12px;
}

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

/* --- Guide Section --- */
.guide-section {
    padding: 8rem 2rem;
    background-color: var(--bg-main);
}

.guide-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.guide-card {
    background: var(--bg-alt);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid #e5e7eb;
}

.guide-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.guide-card p {
    margin-bottom: 1rem;
    font-size: 1rem;
}

.guide-list {
    list-style-type: none;
}

.guide-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.guide-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* --- CTA Section --- */
.cta-section {
    padding: 8rem 2rem;
    text-align: center;
    background-color: var(--bg-alt);
}

.cta-box {
    max-width: 700px;
    margin: 0 auto;
}

.cta-box p {
    margin-bottom: 2.5rem;
}

.sys-req {
    margin-top: 1.5rem;
    font-size: 0.875rem !important;
    color: #9ca3af;
}

/* --- Footer --- */
footer {
    background-color: #000000;
    color: #ffffff;
    padding: 4rem 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.footer-left p {
    color: #9ca3af;
    font-size: 0.875rem;
}

.footer-links a {
    color: #ffffff;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    transition: opacity 0.2s;
}

.footer-links a:hover {
    opacity: 0.8;
}

/* --- Animations & Utilities --- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }

/* Responsive adjustments */
@media (max-width: 768px) {
    .guide-grid {
        grid-template-columns: 1fr;
    }
    .nav-links {
        display: none; /* Hide text links on mobile */
    }
}
@media (max-width: 640px) {
    .hero-actions {
        flex-direction: column;
    }
    .footer-container {
        flex-direction: column;
        text-align: center;
        justify-content: center;
    }
}