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

:root {
    --color-primary: #003366;
    --color-primary-dark: #002244;
    --color-accent: #0066cc;
    --color-accent-hover: #0052a3;
    --color-bg: #f5f6f8;
    --color-white: #ffffff;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-border: #dde1e6;
    --color-footer-bg: #1a1a2e;
    --color-footer-text: #cccccc;
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --max-width: 1200px;
}

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

body {
    font-family: var(--font-main);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-accent);
    text-decoration: none;
}

a:hover, a:focus {
    text-decoration: underline;
    color: var(--color-accent-hover);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

/* === Demo Banner === */
.demo-banner {
    background: #ff6600;
    color: #ffffff;
    text-align: center;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.demo-banner a {
    color: #ffffff;
    text-decoration: underline;
}

/* === Header === */
.site-header {
    background: var(--color-primary);
    color: var(--color-white);
}

.header-top {
    padding: 1.25rem 0;
    border-bottom: 3px solid var(--color-accent);
}

.branding {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.site-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.site-subtitle {
    font-size: 0.85rem;
    opacity: 0.85;
    font-weight: 400;
}

/* === Navigation === */
.main-nav {
    background: var(--color-primary-dark);
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 0;
}

.nav-list a {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--color-white);
    font-size: 0.95rem;
    font-weight: 500;
    transition: background 0.2s;
}

.nav-list a:hover,
.nav-list a:focus,
.nav-list a.active {
    background: var(--color-accent);
    text-decoration: none;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.75rem 0;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    position: relative;
    transition: transform 0.2s;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: absolute;
}

.nav-toggle-icon::before { top: -7px; }
.nav-toggle-icon::after { top: 7px; }

/* === Main Layout === */
.site-main {
    flex: 1;
    padding: 2rem 0;
}

.main-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2rem;
    align-items: start;
}

.content h2 {
    font-size: 1.6rem;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.lead {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

/* === Info Cards === */
.info-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1.25rem;
    border-top: 3px solid var(--color-accent);
}

.card h3 {
    font-size: 1rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* === News Section === */
.news-section {
    margin-top: 1rem;
}

.news-section h2 {
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
}

.news-item {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.news-item time {
    font-size: 0.8rem;
    color: var(--color-accent);
    font-weight: 600;
    text-transform: uppercase;
}

.news-item h3 {
    font-size: 1rem;
    color: var(--color-primary);
    margin: 0.35rem 0;
}

.news-item p {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* === Chatbot Container === */
.chatbot-container {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1.25rem;
    border-top: 3px solid var(--color-accent);
    position: sticky;
    top: 1rem;
}

.chatbot-container h2 {
    font-size: 1.15rem;
    color: var(--color-primary);
    margin-bottom: 0.35rem;
}

.chatbot-description {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 1rem;
}

#amazon-q-chatbot {
    min-height: 500px;
    background: var(--color-bg);
    border-radius: 4px;
    overflow: hidden;
}

#amazon-q-chatbot iframe {
    display: block;
    width: 100%;
    border: none;
    border-radius: 4px;
}

.chatbot-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.chatbot-error {
    padding: 1.5rem;
    text-align: center;
    color: #cc3333;
    font-size: 0.9rem;
}

/* === Footer === */
.site-footer {
    background: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: 2rem 0 0;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-section h3 {
    color: var(--color-white);
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.footer-section p,
.footer-section li {
    font-size: 0.85rem;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: var(--color-footer-text);
}

.footer-section a:hover {
    color: var(--color-white);
}

.footer-bottom {
    text-align: center;
    padding: 1rem 0;
    font-size: 0.8rem;
    opacity: 0.7;
}

/* === Responsive === */
@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .chatbot-container {
        position: static;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 600px) {
    .site-title {
        font-size: 1.5rem;
    }

    .site-subtitle {
        font-size: 0.75rem;
    }

    .nav-toggle {
        display: block;
    }

    .nav-list {
        display: none;
        flex-direction: column;
    }

    .nav-list.open {
        display: flex;
    }

    .nav-list a {
        padding: 0.65rem 1rem;
        border-top: 1px solid rgba(255,255,255,0.1);
    }

    .info-cards {
        grid-template-columns: 1fr;
    }

    .content h2 {
        font-size: 1.3rem;
    }
}