/* ClearWatt Brand Styles */

:root {
    /* Color Palette */
    --color-navy: #001A33;
    --color-yellow: #FFE600;
    --color-grey: #8A95A5;
    --color-white: #FFFFFF;
    
    /* Text Colors */
    --text-main: var(--color-navy);
    --text-light: var(--color-white);
    --text-muted: var(--color-grey);

    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Type Scale */
    --text-xs: 0.75rem;     /* 12px */
    --text-sm: 0.875rem;    /* 14px */
    --text-base: 1rem;      /* 16px */
    --text-lg: 1.125rem;    /* 18px */
    --text-xl: 1.5rem;      /* 24px */
    --text-2xl: 2rem;       /* 32px */
    --text-3xl: 3rem;       /* 48px */
    --text-4xl: 4rem;       /* 64px */

    /* Spacing Scale */
    --space-1: 0.25rem;     /* 4px */
    --space-2: 0.5rem;      /* 8px */
    --space-4: 1rem;        /* 16px */
    --space-6: 1.5rem;      /* 24px */
    --space-8: 2rem;        /* 32px */
    --space-12: 3rem;       /* 48px */
    --space-16: 4rem;       /* 64px */
    
    /* Borders */
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
}
* {
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: var(--space-4);
}
h1 { font-size: var(--text-3xl); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
p { margin-bottom: var(--space-4); color: var(--text-muted); }
p:last-child { margin-bottom: 0; }
a { color: var(--color-navy); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-grey); }

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}
section {
    padding: var(--space-16) 0;
}
.bg-light {
    background-color: #F8FAFC;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-navy);
    color: var(--color-white);
    padding: var(--space-2) var(--space-4);
    z-index: 100;
}
.skip-link:focus {
    top: 0;
}
:focus-visible {
    outline: 3px solid var(--color-yellow);
    outline-offset: 2px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-6);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    border: 2px solid transparent;
}
.btn-primary {
    background-color: var(--color-yellow);
    color: var(--color-navy);
}
.btn-primary:hover {
    background-color: #E6D000;
    color: var(--color-navy);
}
.btn-secondary {
    background-color: transparent;
    color: var(--color-navy);
    border-color: var(--color-navy);
}
.btn-secondary:hover {
    background-color: var(--color-navy);
    color: var(--color-white);
}
.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

/* Header */
.site-header {
    padding: var(--space-4) 0;
    background: var(--color-white);
    border-bottom: 1px solid #E2E8F0;
    position: sticky;
    top: 0;
    z-index: 50;
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo img {
    height: 32px;
    width: auto;
    display: block;
}
.main-nav ul {
    list-style: none;
    display: flex;
    gap: var(--space-6);
}
.main-nav a {
    color: var(--color-navy);
    font-weight: 500;
}
.header-actions {
    display: flex;
    gap: var(--space-4);
}

/* Hero Section */
.hero {
    background-color: var(--color-navy);
    color: var(--color-white);
    padding: var(--space-16) 0 var(--space-16);
    overflow: hidden;
}
.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
}
.hero h1 {
    color: var(--color-white);
}
.hero .subhead {
    font-size: var(--text-lg);
    color: #CBD5E1;
    margin-bottom: var(--space-8);
}
.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}
.hero-cta .microcopy {
    font-size: var(--text-sm);
    color: #94A3B8;
}
.hero-visual img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

/* Problem/Solution */
.problem-solution {
    text-align: center;
}
.problem {
    max-width: 800px;
    margin: 0 auto var(--space-12);
}
.problem h2 {
    color: var(--color-navy);
}
.problem p {
    font-size: var(--text-lg);
}
.solution {
    background: var(--color-navy);
    color: var(--color-white);
    padding: var(--space-12);
    border-radius: var(--radius-lg);
    max-width: 800px;
    margin: 0 auto;
}
.solution h3 {
    color: var(--color-yellow);
}
.solution p {
    color: var(--color-white);
    font-size: var(--text-lg);
}

/* Features */
.features {
    padding: var(--space-16) 0;
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}
.feature-card {
    background: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}
.icon-wrapper {
    height: 64px;
    width: 64px;
    margin-bottom: var(--space-6);
}
.feature-img {
    height: 100%;
    width: 100%;
    object-fit: contain;
    /* We could apply a filter or map different portions of a sprite here later if needed */
}

/* How It Works */
.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
    margin-top: var(--space-12);
}
.step {
    position: relative;
    text-align: center;
}
.step-number {
    width: 48px;
    height: 48px;
    background: var(--color-yellow);
    color: var(--color-navy);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    font-weight: 700;
    margin: 0 auto var(--space-4);
}

/* Demo Video */
.demo {
    background: var(--color-navy);
    color: var(--color-white);
    text-align: center;
}
.demo h2 {
    color: var(--color-white);
}
.video-wrapper {
    max-width: 800px;
    margin: var(--space-8) auto 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}
.video-wrapper video {
    width: 100%;
    display: block;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: var(--space-8) auto 0;
}
.faq-item {
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-8);
    border-bottom: 1px solid #E2E8F0;
}
.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

/* CTA Section */
.cta-section {
    text-align: center;
    background: var(--color-yellow);
    padding: var(--space-16) 0;
}
.cta-section h2 {
    color: var(--color-navy);
}
.cta-section p {
    color: var(--color-navy);
    max-width: 600px;
    margin: 0 auto var(--space-8);
    font-size: var(--text-lg);
}

/* Footer */
.site-footer {
    background: var(--color-navy);
    color: var(--color-white);
    padding: var(--space-16) 0 var(--space-8);
}
.footer-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}
.footer-logo {
    height: 32px;
    filter: brightness(0) invert(1);
    margin-bottom: var(--space-4);
}
.footer-brand p {
    color: #94A3B8;
}
.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}
.footer-links h4 {
    color: var(--color-white);
    margin-bottom: var(--space-4);
}
.footer-links ul {
    list-style: none;
}
.footer-links li {
    margin-bottom: var(--space-2);
}
.footer-links a {
    color: #94A3B8;
}
.footer-links a:hover {
    color: var(--color-yellow);
}
.footer-bottom {
    border-top: 1px solid #1E293B;
    padding-top: var(--space-8);
    text-align: center;
    color: #64748B;
    font-size: var(--text-sm);
}

/* Responsive */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: var(--space-4);
    }
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    h1 { font-size: var(--text-2xl); }
    .hero-cta { align-items: center; }
    .feature-grid, .steps {
        grid-template-columns: 1fr;
    }
    .footer-container {
        grid-template-columns: 1fr;
    }
    .footer-links {
        grid-template-columns: 1fr 1fr;
    }
}
@media (max-width: 480px) {
    .main-nav ul {
        flex-direction: column;
        text-align: center;
        gap: var(--space-2);
    }
    .header-actions {
        flex-direction: column;
        width: 100%;
    }
    .btn { width: 100%; }
    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}