/* ===========================
   1. CSS Custom Properties
   =========================== */
:root {
    --color-primary: #1a6fa0;
    --color-primary-dark: #134f73;
    --color-primary-light: #e8f4fb;
    --color-accent: #e8a830;
    --color-accent-dark: #c8901a;
    --color-text: #2c3e50;
    --color-text-light: #5a6c7d;
    --color-bg: #ffffff;
    --color-bg-alt: #f4f7fa;
    --color-border: #dce3ea;
    --color-success: #27ae60;
    --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-heading: Georgia, 'Times New Roman', serif;
    --max-width: 1100px;
    --spacing: 1.5rem;
    --radius: 6px;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 20px rgba(0,0,0,0.12);
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--color-primary-dark);
}

/* ===========================
   3. Typography
   =========================== */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--color-text);
    line-height: 1.3;
    margin-bottom: 0.75rem;
}

h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.4rem;
    border-bottom: 2px solid var(--color-primary-light);
}

h3 {
    font-size: 1.2rem;
    margin-top: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

ul, ol {
    margin: 0 0 1rem 1.5rem;
}

li {
    margin-bottom: 0.3rem;
}

strong {
    color: var(--color-text);
}

blockquote {
    border-left: 4px solid var(--color-primary);
    padding: 0.75rem 1.25rem;
    margin: 1.5rem 0;
    background: var(--color-bg-alt);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
    color: var(--color-text-light);
}

/* ===========================
   4. Layout
   =========================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
}

.content {
    padding: 2rem 0 3rem;
}

.content article {
    max-width: 800px;
}

.section-alt {
    background: var(--color-bg-alt);
    padding: 3rem 0;
}

/* ===========================
   5. Header & Navigation
   =========================== */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary);
    gap: 0.5rem;
}

.logo:hover {
    color: var(--color-primary-dark);
}

.logo svg {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.main-nav > ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0.25rem;
    align-items: center;
}

.main-nav a {
    display: block;
    padding: 0.5rem 0.85rem;
    color: var(--color-text);
    font-size: 0.95rem;
    border-radius: var(--radius);
    transition: background var(--transition), color var(--transition);
}

.main-nav a:hover {
    background: var(--color-bg-alt);
    color: var(--color-primary);
}

.main-nav .btn-nav {
    background: var(--color-accent);
    color: #fff;
    font-weight: 600;
    padding: 0.5rem 1.1rem;
}

.main-nav .btn-nav:hover {
    background: var(--color-accent-dark);
    color: #fff;
}

/* Dropdown */
.has-dropdown {
    position: relative;
}

.has-dropdown > a::after {
    content: " \25BE";
    font-size: 0.7em;
}

.dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 220px;
    padding: 0.5rem 0;
    z-index: 200;
}

.dropdown li {
    margin: 0;
}

.dropdown a {
    padding: 0.45rem 1rem;
    border-radius: 0;
    font-size: 0.9rem;
}

@media (min-width: 769px) {
    .has-dropdown:hover .dropdown {
        display: block;
    }
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

/* ===========================
   6. Breadcrumb
   =========================== */
.breadcrumb {
    background: var(--color-bg-alt);
    padding: 0.6rem 0;
    font-size: 0.85rem;
}

.breadcrumb ol {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.breadcrumb li::after {
    content: ">";
    margin-left: 0.4rem;
    color: var(--color-text-light);
}

.breadcrumb li:last-child::after {
    content: none;
}

.breadcrumb a {
    color: var(--color-text-light);
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

/* ===========================
   7. Hero Section
   =========================== */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    padding: 3.5rem 0;
    text-align: center;
}

.hero h1 {
    color: #fff;
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.15rem;
    opacity: 0.92;
    max-width: 650px;
    margin: 0 auto 1.5rem;
}

.hero .btn {
    font-size: 1.1rem;
    padding: 0.85rem 2rem;
}

/* ===========================
   8. Buttons
   =========================== */
.btn {
    display: inline-block;
    padding: 0.65rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: background var(--transition), transform var(--transition);
}

.btn:hover {
    transform: translateY(-1px);
}

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

.btn-primary:hover {
    background: var(--color-accent-dark);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
}

.btn-large {
    padding: 0.85rem 2rem;
    font-size: 1.05rem;
}

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

.btn-white:hover {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

/* ===========================
   9. Cards & Grids
   =========================== */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card h3 {
    margin-top: 0;
    color: var(--color-primary);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

/* ===========================
   10. Tables
   =========================== */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    font-family: var(--font-body);
}

tr:nth-child(even) {
    background: var(--color-bg-alt);
}

tr:hover {
    background: var(--color-primary-light);
}

/* ===========================
   11. CTA Block
   =========================== */
.cta-block {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, #dbedf8 100%);
    border: 1px solid var(--color-primary);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius);
    padding: 1.75rem 2rem;
    margin: 2.5rem 0;
    text-align: center;
}

.cta-block h2 {
    border: none;
    margin-top: 0;
    padding-bottom: 0;
    color: var(--color-primary-dark);
    font-size: 1.35rem;
}

.cta-block p {
    color: var(--color-text-light);
    margin-bottom: 1rem;
}

/* ===========================
   12. Forms
   =========================== */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.35rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text);
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    transition: border-color var(--transition), box-shadow var(--transition);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 111, 160, 0.15);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Thank you message */
.merci-message {
    background: #eafaf1;
    border: 1px solid var(--color-success);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    color: var(--color-success);
}

.merci-message h2 {
    border: none;
    color: var(--color-success);
    margin-top: 0;
}

/* ===========================
   13. FAQ Accordion
   =========================== */
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.faq-item summary {
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition);
}

.faq-item summary:hover {
    background: var(--color-bg-alt);
}

.faq-item summary::after {
    content: "+";
    font-size: 1.3rem;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-left: 1rem;
}

.faq-item[open] summary::after {
    content: "\2212";
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-answer {
    padding: 0 1.25rem 1rem;
    color: var(--color-text-light);
}

/* ===========================
   14. Spec Box (Brand pages)
   =========================== */
.spec-box {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.spec-box h3 {
    margin-top: 0;
    color: var(--color-primary);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.spec-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.spec-list li {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.spec-list li:last-child {
    border-bottom: none;
}

.spec-label {
    font-weight: 600;
    color: var(--color-text);
}

.spec-value {
    color: var(--color-text-light);
}

/* Rating */
.rating {
    color: var(--color-accent);
    font-size: 1.1rem;
    letter-spacing: 2px;
}

/* ===========================
   15. Footer
   =========================== */
.site-footer {
    background: var(--color-text);
    color: rgba(255,255,255,0.8);
    padding: 2.5rem 0 1.5rem;
    margin-top: 3rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.site-footer h3 {
    color: #fff;
    font-size: 1rem;
    font-family: var(--font-body);
    margin-bottom: 0.75rem;
}

.site-footer ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-footer li {
    margin-bottom: 0.35rem;
}

.site-footer a {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
}

.site-footer a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.15);
    padding-top: 1rem;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

/* ===========================
   16. Utilities
   =========================== */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-light); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* Tags */
.tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 3px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Intro paragraph */
.intro {
    font-size: 1.1rem;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

/* Table of contents */
.toc {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
}

.toc h3 {
    margin: 0 0 0.5rem;
    font-size: 1rem;
    font-family: var(--font-body);
}

.toc ol {
    margin: 0;
    padding-left: 1.25rem;
}

.toc li {
    margin-bottom: 0.25rem;
}

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

.toc a:hover {
    color: var(--color-primary);
}

/* ===========================
   17. Media Queries
   =========================== */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    h1 { font-size: 1.6rem; }
    h2 { font-size: 1.3rem; }

    .hero { padding: 2.5rem 0; }
    .hero h1 { font-size: 1.7rem; }
    .hero p { font-size: 1rem; }

    /* Mobile nav */
    .nav-toggle {
        display: flex;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-top: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        padding: 1rem;
    }

    .main-nav.is-open {
        display: block;
    }

    .main-nav > ul {
        flex-direction: column;
        gap: 0;
    }

    .main-nav a {
        padding: 0.75rem 1rem;
    }

    /* Mobile dropdowns */
    .dropdown {
        position: static;
        border: none;
        box-shadow: none;
        padding-left: 1rem;
        display: none;
    }

    .has-dropdown.is-open .dropdown {
        display: block;
    }

    /* Grids */
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

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

    .form-grid {
        grid-template-columns: 1fr;
    }

    /* Table responsive */
    table {
        font-size: 0.85rem;
    }

    th, td {
        padding: 0.5rem 0.6rem;
    }

    .cta-block {
        padding: 1.25rem;
    }
}