/* Maintainity - Industrial theme
   Dark slate + safety-orange accent. Fast, minimal, content-first. */

/* Accessibility: skip to main content */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--mt-accent);
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 9999;
    font-weight: 600;
    text-decoration: none;
}
.skip-link:focus {
    top: 0;
}

/* Focus styles for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--mt-accent);
    outline-offset: 2px;
}

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

:root {
    --mt-slate-900: #0b1220;
    --mt-slate-800: #111a2c;
    --mt-slate-700: #1c2a44;
    --mt-accent:      #ff6b00;
    --mt-accent-soft: #fff2e6;
    --mt-text:        #2b3340;
    --mt-border:      #dfe5ee;
}

/* ------------------------------------------------------------------ Layout */
body {
    color: var(--mt-text);
    font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
    background: #ffffff;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-main {
    flex: 1 0 auto;
    padding-top: 1rem;
    padding-bottom: 3rem;
}

/* ------------------------------------------------------------ Site header */
.site-header {
    background: var(--mt-slate-900);
    border-bottom: 3px solid var(--mt-accent);
}

.site-header .navbar {
    min-height: 64px;
}

.site-header .navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: #ffffff;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.brand-mark {
    width: 14px;
    height: 26px;
    background: var(--mt-accent);
    border-radius: 2px;
}

.site-header .nav-link {
    color: #c7d0de;
    font-weight: 500;
}

.site-header .nav-link:hover,
.site-header .nav-link:focus {
    color: #ffffff;
}

.site-header .nav-link.active {
    color: #ffffff;
    border-bottom: 2px solid var(--mt-accent);
}

.navbar-toggler {
    border-color: rgba(255, 255, 255, 0.35);
}

.navbar-toggler-icon {
    filter: invert(1);
}

/* ------------------------------------------------------------------- Hero */
.hero {
    background:
        linear-gradient(135deg, var(--mt-slate-900) 0%, var(--mt-slate-800) 60%);
    color: #ffffff;
    padding: 4rem 0;
}

.hero .hero-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--mt-accent-soft);
    color: var(--mt-accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.75rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1rem;
}

.hero p.lead {
    color: #c7d0de;
    max-width: 40rem;
}

.hero .btn-accent {
    background: var(--mt-accent);
    border: 1px solid var(--mt-accent);
    color: #ffffff;
    font-weight: 600;
}

.hero .btn-accent:hover,
.hero .btn-accent:focus {
    background: #e05f00;
    border-color: #e05f00;
    color: #ffffff;
}

.hero .btn-outline-light {
    border-color: rgba(255, 255, 255, 0.5);
    color: #ffffff;
}

/* --------------------------------------------------------- Section titles */
.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.section-subtitle {
    color: #67758c;
    margin-bottom: 1.5rem;
}

/* --------------------------------------------------------- Feature cards */
.feature-card {
    height: 100%;
    border: 1px solid var(--mt-border);
    border-radius: 6px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
    border-color: var(--mt-accent);
    box-shadow: 0 6px 18px rgba(11, 18, 32, 0.08);
}

.feature-card .feature-index {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--mt-accent-soft);
    color: var(--mt-accent);
    font-weight: 700;
    border-radius: 6px;
    margin-bottom: 0.75rem;
}

.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 650;
    margin-bottom: 0.5rem;
    color: var(--mt-text);
}

.feature-card p {
    color: #67758c;
    margin-bottom: 0.75rem;
}

/* ------------------------------------------------------------- Components */
.mt-card {
    border: 1px solid var(--mt-border);
    border-radius: 6px;
    height: 100%;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.mt-card:hover {
    border-color: var(--mt-accent);
    box-shadow: 0 4px 14px rgba(11, 18, 32, 0.08);
}

/* ------------------------------------------------------------ Calculator */
.calc-form-card {
    border: 1px solid var(--mt-border);
    border-radius: 6px;
    background: #fff;
}

.calc-result-card {
    border: 1px solid var(--mt-accent);
    border-radius: 6px;
    background: #fff;
}

.calc-result-card .table td {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--mt-border);
}

.calc-placeholder {
    border: 2px dashed var(--mt-border);
    border-radius: 6px;
    padding: 3rem 2rem;
}

/* ----------------------------------------------- Calculator documentation */
.calc-doc-card {
    border: 1px solid var(--mt-border);
    border-radius: 6px;
    background: #fff;
}

.calc-formula {
    background: var(--mt-slate-900);
    color: #e0e6ef;
    padding: 1rem 1.25rem;
    border-radius: 4px;
    font-family: "Cascadia Code", "Fira Code", "Consolas", monospace;
    font-size: 0.95rem;
    white-space: pre-wrap;
}

.calc-doc-card h2 {
    color: var(--mt-text);
}

.calc-doc-card ul {
    padding-left: 1.25rem;
}

.calc-doc-card ul li {
    margin-bottom: 0.4rem;
}

.calc-doc-card ul li strong {
    color: var(--mt-text);
}

/* ----------------------------------------------- Markdown article content */
.article-content p {
    margin-bottom: 1rem;
}

.article-content h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.article-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.article-content pre {
    background: var(--mt-slate-900);
    color: #e0e6ef;
    padding: 1rem 1.25rem;
    border-radius: 4px;
    font-family: "Cascadia Code", "Fira Code", "Consolas", monospace;
    font-size: 0.95rem;
    white-space: pre-wrap;
    overflow-x: auto;
}

.article-content code {
    font-family: "Cascadia Code", "Fira Code", "Consolas", monospace;
    font-size: 0.9em;
}

.article-content p code,
.article-content li code {
    background: var(--mt-slate-100, #f1f5f9);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
}

.article-content blockquote {
    border-left: 3px solid var(--mt-accent);
    padding-left: 1rem;
    margin-left: 0;
    color: var(--mt-secondary);
    font-style: italic;
}

.article-content blockquote p {
    margin-bottom: 0.5rem;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--mt-border);
    margin: 2rem 0;
}

.article-content ul,
.article-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.article-content li {
    margin-bottom: 0.4rem;
}

.page-heading {
    padding: 2.5rem 0 1.25rem;
}

.page-heading h1 {
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.status-unreleased {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: #eef2f7;
    color: #67758c;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    border-radius: 4px;
}

/* -------------------------------------------------------------- Buttons */
.bg-accent {
    background-color: var(--mt-accent) !important;
    color: #ffffff !important;
}

.btn-accent {
    background-color: var(--mt-accent) !important;
    border-color: var(--mt-accent) !important;
    color: #ffffff !important;
    font-weight: 600;
}

.btn-accent:hover,
.btn-accent:focus {
    background-color: #e05f00 !important;
    border-color: #e05f00 !important;
    color: #ffffff !important;
}

.btn-outline-accent {
    color: var(--mt-accent);
    border: 1px solid var(--mt-accent);
}

.btn-outline-accent:hover,
.btn-outline-accent:focus {
    background: var(--mt-accent);
    border-color: var(--mt-accent);
    color: #ffffff;
}

/* ------------------------------------------------------------- Footer */
.site-footer {
    background: var(--mt-slate-900);
    color: #c7d0de;
}

.site-footer .footer-brand {
    font-weight: 700;
    color: #ffffff;
}

.site-footer a {
    color: #c7d0de;
    text-decoration: none;
}

.site-footer a:hover {
    color: #ffffff;
    text-decoration: underline;
}

.site-footer .border-top {
    border-color: rgba(255, 255, 255, 0.12) !important;
}

/* ---------------------------------------------------------- Responsive */
@media (max-width: 991.98px) {
    .site-header .nav-link.active {
        border-bottom: none;
        border-left: 3px solid var(--mt-accent);
        padding-left: 0.75rem;
    }
}

/* ========================================================= Admin layout */
body.admin-body {
    display: block;
    flex: none;
    flex-direction: unset;
    background: #f5f7fa;
    min-height: 100vh;
}

body.admin-body .admin-sidebar {
    width: 240px;
    min-height: 100vh;
    background: var(--mt-slate-900);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    padding-top: 1.5rem;
    z-index: 100;
}

body.admin-body .admin-sidebar .sidebar-brand {
    display: block;
    padding: 0 1.25rem 1.5rem;
    font-weight: 700;
    font-size: 1.05rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: #ffffff;
    text-decoration: none;
}

body.admin-body .admin-sidebar .sidebar-nav {
    list-style: none;
    padding: 0.75rem 0 0;
    margin: 0;
}

body.admin-body .admin-sidebar .sidebar-nav li {
    display: block;
}

body.admin-body .admin-sidebar .sidebar-nav li a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    color: #c7d0de;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.1s ease, background 0.1s ease;
}

body.admin-body .admin-sidebar .sidebar-nav li a:hover,
body.admin-body .admin-sidebar .sidebar-nav li a.active {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.06);
}

body.admin-body .admin-sidebar .sidebar-nav li a.active {
    border-left: 3px solid var(--mt-accent);
    padding-left: calc(1.25rem - 3px);
}

body.admin-body .admin-sidebar .sidebar-nav .sidebar-section {
    display: block;
    padding: 0.75rem 1.25rem 0.3rem;
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #6b7a90;
}

body.admin-body .admin-sidebar .sidebar-footer {
    padding: 1.25rem;
    font-size: 0.78rem;
    color: #8899b0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    position: absolute;
    bottom: 0;
    width: 100%;
    box-sizing: border-box;
}

body.admin-body .admin-sidebar .sidebar-footer a {
    color: #8899b0;
    text-decoration: none;
}

body.admin-body .admin-sidebar .sidebar-footer a:hover {
    color: #fff;
}

body.admin-body .admin-main {
    margin-left: 240px;
    padding: 2rem 2rem 3rem;
    min-height: 100vh;
}

body.admin-body .admin-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

body.admin-body .stat-card {
    border: 1px solid var(--mt-border);
    border-radius: 6px;
    padding: 1.5rem;
    background: #fff;
}

body.admin-body .stat-card h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 0.15rem;
}

body.admin-body .stat-card p {
    color: #67758c;
    margin: 0;
    font-size: 0.88rem;
}

/* Admin responsive */
@media (max-width: 991.98px) {
    body.admin-body .admin-sidebar {
        position: static;
        width: 100%;
        min-height: auto;
        padding-top: 0;
    }
    body.admin-body .admin-sidebar .sidebar-nav {
        display: flex;
        flex-wrap: wrap;
        padding: 0.5rem 0;
    }
    body.admin-body .admin-sidebar .sidebar-nav li a {
        padding: 0.4rem 1rem;
    }
    body.admin-body .admin-sidebar .sidebar-section { display: none; }
    body.admin-body .admin-sidebar .sidebar-footer { display: none; }
    body.admin-body .admin-main { margin-left: 0; padding: 1rem; }
}