/* --- Global Styles & Arbisoft Branding --- */
:root {
    --primary-blue: #1e3a8a;
    --accent-blue: #3b82f6;
    --dark-slate: #0f172a;
    --light-bg: #f8fafc;
    --text-color: #334155;
    --border-color: #e2e8f0;
    --warning-red: #ef4444;
    --warning-bg: #fef2f2;
    --notice-amber: #b45309;
    --notice-bg: #fffbeb;
    --header-height: 84px;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 16px); }
body { background-color: var(--light-bg); color: var(--text-color); line-height: 1.6; display: flex; flex-direction: column; min-height: 100vh; }

/* --- Header Architecture --- */
header { background-color: #ffffff; padding: 1rem 5%; display: flex; justify-content: space-between; align-items: center; gap: 16px; box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100; flex-wrap: wrap; }
.logo { font-size: 1.5rem; font-weight: 700; color: var(--primary-blue); text-decoration: none; }
.logo span { color: var(--accent-blue); }
.header-right-text { font-size: 1rem; font-weight: 600; color: var(--primary-blue); opacity: 0.9; }
.header-actions { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }

/* Brand bar (landing header) */
.brand-bar { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.brand-logo { display: flex; align-items: center; text-decoration: none; }
.brand-logo img { height: 72px; width: auto; display: block; }

/* Documentation "back" button */
.btn-back { text-decoration: none; font-weight: 600; font-size: 0.9rem; color: var(--accent-blue); border: 1px solid var(--accent-blue); padding: 8px 16px; border-radius: 4px; transition: all 0.3s ease; white-space: nowrap; }
.btn-back:hover { background-color: var(--accent-blue); color: #ffffff; }

/* Mobile sidebar toggle (hidden on desktop) */
.sidebar-toggle { display: none; background-color: var(--accent-blue); color: #fff; border: none; padding: 8px 14px; border-radius: 4px; font-weight: 600; font-size: 0.9rem; cursor: pointer; }

/* --- Layout Containers --- */
main { flex: 1; }
.container { max-width: 1200px; margin: 0 auto; padding: 50px 20px; }
.hero { background: linear-gradient(135deg, var(--primary-blue), var(--dark-slate)); color: #fff; padding: 80px 20px; text-align: center; }
.hero h1 { font-size: 2.8rem; margin-bottom: 6px; font-weight: 700; color: #fff; text-transform: uppercase; letter-spacing: 1px; }
.hero h2 { font-size: 1.6rem; color: #fff; font-weight: 600; margin: 18px 0 25px; opacity: 0.95; }
.hero p { font-size: 1.15rem; max-width: 780px; margin: 0 auto 35px; opacity: 0.9; line-height: 1.75; color: #fff; }
.hero-subtitle { font-size: 1rem; opacity: 0.8; font-style: italic; margin-bottom: 30px; font-weight: 500; letter-spacing: 0.5px; }

/* --- Buttons --- */
.btn { display: inline-block; background-color: var(--accent-blue); color: #fff; padding: 12px 28px; text-decoration: none; border-radius: 5px; font-weight: bold; transition: 0.3s; border: none; cursor: pointer; font-size: 1rem; }
.btn:hover { background-color: #2563eb; }
.btn-block { width: 100%; }

/* --- Inline Contact Form --- */
.form-section { background-color: #ffffff; border-top: 1px solid var(--border-color); padding: 60px 20px; scroll-margin-top: var(--header-height); }
.form-container { background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 20px rgba(0,0,0,0.06); max-width: 650px; margin: 0 auto; border: 1px solid var(--border-color); }
.form-title { color: var(--primary-blue); margin-bottom: 8px; text-align: center; }
.form-subtitle { text-align: center; margin-bottom: 30px; color: #64748b; font-size: 0.95rem; }
.form-row { display: flex; gap: 20px; }
.form-row .form-group { flex: 1; }
.form-group { margin-bottom: 25px; }
.form-group label, .form-group legend { display: block; margin-bottom: 8px; font-weight: 600; color: var(--dark-slate); }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 12px; border: 1px solid var(--border-color); border-radius: 5px; font-size: 1rem; color: var(--dark-slate); background-color: #f8fafc; font-family: inherit; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: 2px solid var(--accent-blue); background-color: #fff; }
.form-group textarea { resize: vertical; }
.service-fieldset { border: 0; padding: 0; min-width: 0; }
.service-checkboxes > div { display: grid; gap: 10px; }
.service-checkboxes label { display: flex; align-items: center; gap: 10px; margin: 0; padding: 10px 12px; border: 1px solid var(--border-color); border-radius: 5px; background-color: #f8fafc; font-weight: 400; cursor: pointer; }
.service-checkboxes label:hover { border-color: var(--accent-blue); background-color: #eff6ff; }
.service-checkboxes input[type="checkbox"] { width: auto; margin: 0; padding: 0; flex: 0 0 auto; accent-color: var(--accent-blue); }
.service-checkboxes input[type="checkbox"]:focus { outline: 2px solid var(--accent-blue); outline-offset: 2px; }
.req { color: var(--warning-red); }
.field-error { display: block; color: var(--warning-red); font-size: 0.85rem; margin-top: 6px; }

/* --- Alerts / messages --- */
.alert { padding: 14px 18px; border-radius: 6px; margin-bottom: 20px; font-size: 0.95rem; border-left: 4px solid; }
.alert-success { background-color: #f0fdf4; border-color: #16a34a; color: #166534; }
.alert-error { background-color: var(--warning-bg); border-color: var(--warning-red); color: #991b1b; }
.alert-info { background-color: #eff6ff; border-color: var(--accent-blue); color: #1e40af; }

/* --- Administrative Notice & Warning Boxes --- */
.critical-notice { background-color: var(--notice-bg); border-left: 5px solid var(--notice-amber); padding: 20px; margin: 25px 0; border-radius: 4px; color: #78350f; }
.critical-notice h4 { font-size: 1.1rem; margin-bottom: 8px; color: var(--notice-amber); }
.admin-warning { background-color: var(--warning-bg); border-left: 5px solid var(--warning-red); padding: 20px; margin: 25px 0; border-radius: 4px; color: #991b1b; }
.admin-warning h4 { font-size: 1.1rem; margin-bottom: 8px; color: var(--warning-red); }

/* --- Technical Documentation Sidebar Layout --- */
.docs-layout { display: flex; gap: 40px; margin-top: 0; padding-top: 20px; padding-bottom: 40px; align-items: flex-start; }
/* FIX: sidebar is independently scrollable. It pins below the sticky header and
   scrolls within its own viewport-height box instead of growing with content. */
.docs-sidebar {
    width: 300px;
    flex-shrink: 0;
    border-right: 1px solid var(--border-color);
    padding-right: 20px;
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height) - 20px);
    overflow-y: auto;
    overscroll-behavior: contain;
}
.docs-nav-group { margin-bottom: 30px; }
.docs-sidebar h4 { color: var(--accent-blue); margin-bottom: 12px; font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.5px; }
.docs-sidebar ul { list-style: none; }
.docs-sidebar ul li { margin-bottom: 10px; }
.docs-sidebar ul li a { text-decoration: none; color: var(--text-color); font-weight: 500; font-size: 0.93rem; display: block; padding: 4px 10px; border-left: 2px solid transparent; border-radius: 0 4px 4px 0; transition: color 0.2s, border-color 0.2s, background-color 0.2s; }
.docs-sidebar ul li a:hover { color: var(--accent-blue); background-color: #f1f5f9; }
/* Scrollspy active state */
.docs-sidebar ul li a.active { color: var(--accent-blue); font-weight: 700; border-left-color: var(--accent-blue); background-color: #eff6ff; }

.docs-content { flex: 1; min-width: 0; background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
.docs-part { margin-bottom: 20px; }
.docs-part:first-child { border-bottom: 4px solid var(--border-color); padding-bottom: 40px; margin-bottom: 40px; }
.docs-part-title { font-size: 2.2rem; color: var(--primary-blue); margin-bottom: 5px; }
.docs-part-sub { color: #64748b; font-style: italic; margin-bottom: 30px; }
.docs-content section { margin-bottom: 45px; scroll-margin-top: calc(var(--header-height) + 16px); }
.docs-content h2 { color: var(--primary-blue); font-size: 1.8rem; margin-bottom: 15px; border-bottom: 2px solid var(--border-color); padding-bottom: 8px; }
.docs-content h3 { color: #2596be; font-size: 1.3rem; margin: 25px 0 12px; }
.docs-content h4 { margin: 18px 0 8px; color: var(--dark-slate); }
.docs-content .docs-subheading { color: #2596be; }
.docs-content p { margin-bottom: 12px; }
.docs-content ul, .docs-content ol { margin-left: 20px; margin-bottom: 15px; }
.docs-content li { margin-bottom: 8px; }
.docs-note { margin: 18px 0; padding: 12px 16px; background: #eff6ff; border-left: 4px solid var(--accent-blue); border-radius: 4px; color: #1e3a8a; }
.docs-table-title { margin-top: 32px; }
.docs-figure { margin: 24px auto 30px; text-align: center; }
.docs-figure img { display: block; width: auto; max-width: 100%; height: auto; margin: 0 auto; border: 1px solid var(--border-color); border-radius: 6px; box-shadow: 0 4px 14px rgba(15, 23, 42, 0.1); }
.docs-figure-narrow img { max-width: 760px; }

/* --- Technical Code Elements --- */
pre { background-color: #0f172a; color: #f8fafc; padding: 18px; border-radius: 6px; overflow-x: auto; font-family: 'Courier New', Courier, monospace; font-size: 0.9rem; margin: 15px 0; }
code { font-family: 'Courier New', Courier, monospace; background-color: #e2e8f0; color: #1e293b; padding: 2px 6px; border-radius: 4px; font-size: 0.9rem; }
pre code { background-color: transparent; color: inherit; padding: 0; }

/* --- Responsive Layout Tables --- */
.table-wrapper { overflow-x: auto; margin: 25px 0; }
.docs-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.95rem; }
.docs-table th { background-color: #f1f5f9; color: var(--primary-blue); font-weight: 700; padding: 12px; border-bottom: 2px solid var(--border-color); }
.docs-table td { padding: 12px; border-bottom: 1px solid var(--border-color); vertical-align: top; }

footer { background-color: var(--dark-slate); color: #94a3b8; text-align: center; padding: 25px; font-size: 0.9rem; border-top: 1px solid #1e293b; }

/* --- Responsive breakpoints --- */
@media (max-width: 900px) {
    .docs-layout { flex-direction: column; gap: 0; }
    .sidebar-toggle { display: inline-block; }
    /* On mobile the sidebar becomes a collapsible drawer above the content. */
    .docs-sidebar {
        width: 100%;
        position: static;
        height: auto;
        max-height: 0;
        overflow: hidden;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-right: 0;
        margin-bottom: 0;
        transition: max-height 0.3s ease, margin-bottom 0.3s ease;
    }
    .docs-sidebar.open { max-height: 70vh; overflow-y: auto; margin-bottom: 25px; }
    .docs-content { padding: 25px; }
}

@media (max-width: 640px) {
    .hero { padding: 56px 18px; }
    .hero h1 { font-size: 2rem; }
    .hero h2 { font-size: 1.25rem; }
    .hero p { font-size: 1rem; }
    .form-container { padding: 26px 20px; }
    .form-row { flex-direction: column; gap: 0; }
    .form-section { padding: 40px 16px; }
    header { padding: 0.85rem 5%; }
    .brand-logo img { height: 56px; }
    .header-right-text { display: none; }
    .docs-part-title { font-size: 1.6rem; }
    .docs-content h2 { font-size: 1.4rem; }
}