/* css/style.css */

/* FONT IMPORT */
@import url('https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@700&family=Source+Sans+Pro:wght@400;600&display=swap');

/* MODERN CSS RESET & VARIABLES */
:root {
    --primary-color: #005f73; /* A deep, professional teal-blue */
    --accent-color: #0a9396;
    --bg-color: #fdfdfd;
    --surface-color: #ffffff;
    --text-color: #212529;
    --text-muted-color: #5a5a5a;
    --border-color: #e9ecef;
    --warning-color: #c9184a;
    --warning-bg-color: #fff0f3;
    --focus-ring-color: rgba(0, 95, 115, 0.25);
    
    --font-heading: 'Roboto Slab', serif;
    --font-body: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --border-radius-md: 10px;
    --border-radius-sm: 6px;
    --shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

html[data-theme="dark"] {
    --primary-color: #94d2bd;
    --accent-color: #0a9396;
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --text-color: #e8e8e8;
    --text-muted-color: #a0a0a0;
    --border-color: #343a40;
    --warning-color: #ff8fa3;
    --warning-bg-color: #2d161a;
    --shadow: 0 5px 25px rgba(0, 0, 0, 0.3);
}

/* BASE STYLES */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 112.5%; /* 18px base */ scroll-behavior: smooth; scroll-padding-top: 100px; }
body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition), color var(--transition);
}

/* ACCESSIBILITY */
.skip-link {
    position: absolute; left: 1rem; top: -100px;
    background: var(--primary-color); color: white;
    padding: 0.5rem 1rem; z-index: 1000;
    transition: top 0.3s ease; border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
}
.skip-link:focus { top: 0; }

:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 3px;
    box-shadow: 0 0 0 4px var(--focus-ring-color);
    border-radius: var(--border-radius-sm);
}

/* TYPOGRAPHY */
h1, h2, h3 { font-family: var(--font-heading); line-height: 1.3; margin-bottom: 1rem; font-weight: 700; }
h1 { font-size: clamp(2.25rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); margin-bottom: 1rem; }
h3 { font-size: 1.25rem; color: var(--text-color); }
p { margin-bottom: 1.5rem; max-width: 70ch; }
.section-intro { max-width: 75ch; margin: 0 auto 3rem auto; text-align: center; color: var(--text-muted-color); font-size: 1.1rem; }
a { color: var(--accent-color); text-decoration: none; font-weight: 600; transition: color var(--transition); }
a:hover { color: var(--primary-color); text-decoration: underline; }
strong { font-weight: 700; color: var(--text-color); }
ul { list-style-position: outside; padding-left: 1.5rem; }
li { margin-bottom: 0.75rem; padding-left: 0.5rem; }

/* LAYOUT */
.container { width: 100%; max-width: 1024px; margin: 0 auto; padding: 0 1.5rem; }
.content-section { padding: 5rem 0; }
.content-section.accent-bg { background-color: var(--surface-color); }

/* HEADER */
.site-header {
    background-color: rgba(253, 253, 253, 0.85);
    padding: 1rem 0; border-bottom: 1px solid var(--border-color);
    position: sticky; top: 0; z-index: 10; backdrop-filter: saturate(180%) blur(15px);
}
html[data-theme="dark"] .site-header { background-color: rgba(24, 24, 24, 0.85); }
.site-header .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-family: var(--font-heading); font-weight: 700; font-size: 1.5rem; }
.main-nav { display: none; }
.main-nav ul { list-style: none; display: flex; gap: 0.5rem; }
.main-nav a {
    font-weight: 600; color: var(--text-muted-color); transition: all var(--transition);
    padding: 0.5rem 1rem; border-radius: var(--border-radius-sm); font-size: 0.9rem;
}
.main-nav a:hover { color: var(--text-color); background-color: var(--bg-color); text-decoration: none; }

/* THEME TOGGLE */
.theme-toggle {
    background: var(--surface-color); border: 1px solid var(--border-color);
    border-radius: 50%; width: 44px; height: 44px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    padding: 0; overflow: hidden; transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--primary-color); transform: scale(1.1); }
.theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* HERO */
.hero-section { padding: 4rem 0; }
.hero-section .container { display: grid; grid-template-columns: 1fr; gap: 3rem; align-items: center; text-align: center; }
.hero-eyebrow { display: inline-block; font-weight: 600; color: var(--text-muted-color); margin-bottom: 1rem; font-size: 1rem; letter-spacing: 0.5px; }
.hero-section p { margin: 1.5rem auto; }
.hero-image { margin-top: 3rem; }
.hero-image img { max-width: 100%; max-height: 400px; height: auto; border-radius: var(--border-radius-md); box-shadow: var(--shadow); }

/* BUTTON */
.btn {
    display: inline-block; padding: 0.9rem 2.25rem; border-radius: var(--border-radius-sm);
    font-weight: 700; font-size: 1rem; text-align: center; border: none; cursor: pointer;
    transition: all var(--transition); text-decoration: none;
}
.btn-primary { background-color: var(--primary-color); color: #fff; }
.btn-primary:hover { background-color: var(--primary-hover); transform: translateY(-3px); box-shadow: 0 8px 25px rgba(0, 95, 115, 0.2); }

/* CONTENT & CARDS */
.content-card { background-color: var(--surface-color); padding: 2.5rem; border-radius: var(--border-radius-md); box-shadow: var(--shadow); }
.content-card.full-width { grid-column: 1 / -1; }
.cards-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; margin-top: 3rem; }

.info-card {
    background-color: var(--surface-color); border-radius: var(--border-radius-md);
    padding: 2rem; text-align: center; box-shadow: var(--shadow);
    border-top: 4px solid var(--primary-color);
    display: flex; flex-direction: column;
}
.info-card h3 { border: none; padding-bottom: 0; margin-bottom: 1.5rem; }
.info-card p { flex-grow: 1; }
.card-image { margin: 1.5rem 0; max-width: 100%; border-radius: var(--border-radius-sm); border: 1px solid var(--border-color); }

/* SAFETY CARDS */
.info-card-safety {
    padding: 1.5rem; border-radius: var(--border-radius-md); border: 1px solid var(--border-color);
    display: flex; flex-direction: column;
}
.info-card-safety h3 { margin-bottom: 1rem; border: none; padding: 0; }
.info-card-safety ul { padding-left: 1.25rem; flex-grow: 1; }
.info-card-safety.warning { background-color: var(--warning-bg-color); border-left: 5px solid var(--warning-color); }
.info-card-safety.warning h3 { color: var(--warning-color); }

/* TABLE */
.comparison-table { width: 100%; border-collapse: separate; border-spacing: 0; margin-top: 2rem; border: 1px solid var(--border-color); border-radius: var(--border-radius-md); overflow: hidden; }
.comparison-table th, .comparison-table td { padding: 1rem 1.25rem; text-align: left; border-bottom: 1px solid var(--border-color); }
.comparison-table th { background-color: var(--bg-color); font-weight: 600; }
.comparison-table tr:last-child td { border-bottom: none; }

/* FAQ */
.faq-accordion { max-width: 800px; margin: 3rem auto 0 auto; }
.faq-accordion details { border-bottom: 1px solid var(--border-color); }
.faq-accordion summary {
    font-family: var(--font-heading); font-weight: 700; font-size: 1.1rem;
    cursor: pointer; list-style: none; padding: 1.25rem 0;
    display: flex; justify-content: space-between; align-items: center; position: relative;
}
.faq-accordion summary::-webkit-details-marker { display: none; }
.faq-accordion summary::after {
    content: '+'; font-size: 1.75rem; color: var(--text-muted-color);
    transition: transform var(--transition);
}
.faq-accordion details[open] summary::after { transform: rotate(45deg); }
.faq-accordion .faq-answer { padding-bottom: 1.5rem; color: var(--text-muted-color); }

/* FOOTER */
.site-footer { padding: 4rem 0; text-align: center; font-size: 0.9rem; color: var(--text-muted-color); background-color: var(--surface-color); border-top: 1px solid var(--border-color); }
.site-footer p { margin-bottom: 0.5rem; max-width: 80ch; margin-left: auto; margin-right: auto; }

/* RESPONSIVE */
@media (min-width: 768px) {
    .main-nav { display: block; }
    .hero-section { text-align: left; }
    .hero-section .container { grid-template-columns: 1fr 1fr; gap: 3rem; }
    .hero-section p { margin-left: 0; margin-right: 0; }
    .hero-image { margin-top: 0; }
    .cards-grid { grid-template-columns: 1fr 1fr; }
    .content-section .container.split { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
}

@media (min-width: 992px) {
    .content-section .container.split { gap: 4rem; }
}