/* CSS Variables for Theming */
:root {
    /* Color Palette */
    --color-primary-dark: #1a1a2e;
    --color-primary: #16213e;
    --color-accent: #e94560;
    --color-background: #f8f9fa;
    --color-text-primary: #212529;
    --color-text-secondary: #6c757d;
    --color-border: #dee2e6;
    --color-white: #ffffff;

    /* Agent Accents */
    --agent-tb: #e94560;
    --agent-hikaru: #ff6b6b;
    --agent-alme: #4ecdc4;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-size-h1-desktop: 3.5rem;
    --font-size-h1-mobile: 2.5rem;
    --font-size-h2-desktop: 2.5rem;
    --font-size-h2-mobile: 2rem;
    --font-size-body: 1rem;
    --line-height-body: 1.6;

    /* Layout */
    --container-max-width: 1200px;
    --gap: 24px;
    --padding-mobile: 24px;
    --padding-desktop: 48px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;

    /* Shadows */
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--padding-mobile);
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--padding-desktop);
    }
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: var(--color-white);
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-h1-mobile);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-h1-desktop);
    }
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

@media (min-width: 640px) {
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: #d63d55;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    border-color: var(--color-accent);
}

.btn-secondary:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

/* Section Styles */
.section {
    padding: var(--spacing-xl) 0;
}

.section-alt {
    background-color: var(--color-white);
}

.section-cta {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: var(--color-white);
    text-align: center;
}

.section-title {
    font-size: var(--font-size-h2-mobile);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--color-accent);
    border-radius: 2px;
}

@media (min-width: 768px) {
    .section-title {
        font-size: var(--font-size-h2-desktop);
    }
}

.section-content p {
    margin-bottom: var(--spacing-md);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    color: var(--color-text-secondary);
}

/* Agent Grid */
.agent-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap);
    margin-top: var(--spacing-lg);
}

@media (min-width: 640px) {
    .agent-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .agent-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Agent Card */
.agent-card {
    background-color: var(--color-white);
    border: 3px solid var(--agent-accent, var(--color-accent));
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
}

.agent-card:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-4px);
}

.agent-emoji {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
}

.agent-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.agent-role {
    font-size: 1.125rem;
    color: var(--agent-accent, var(--color-accent));
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.agent-desc {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Steps Grid */
.steps-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap);
    margin-top: var(--spacing-lg);
}

@media (min-width: 640px) {
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Step Card */
.step-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
}

.step-card:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-4px);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--color-accent);
    color: var(--color-white);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
}

.step-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.step-desc {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Use Cases */
.use-cases-content {
    max-width: 800px;
    margin: var(--spacing-lg) auto 0;
}

.use-cases-list {
    list-style: none;
    padding: 0;
}

.use-cases-list li {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    line-height: 1.6;
    transition: all var(--transition-fast);
}

.use-cases-list li:hover {
    box-shadow: var(--shadow-card);
    transform: translateX(4px);
    border-color: var(--color-accent);
}

.use-cases-list strong {
    color: var(--color-accent);
}

/* CTA Section */
.cta-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

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

@media (min-width: 640px) {
    .cta-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
}

@media (min-width: 640px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        text-align: left;
    }
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

@media (min-width: 640px) {
    .footer-nav {
        justify-content: flex-end;
    }
}

.footer-nav a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 8px 16px;
    z-index: 100;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}