/* ============================================================
   IChem — page shell
   Clean, modern scientific light theme shared by every page.
   ============================================================ */

:root {
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-subtle: #f1f5f9;
    --bg-code: #f8fafc;

    --text-main: #1e293b;
    --text-muted: #64748b;
    --text-heading: #0f172a;

    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-soft: #eff6ff;
    --secondary: #0d9488;
    --accent: #0284c7;

    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);

    --nav-h: 64px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
}

.page-body {
    padding: 40px 0 20px;
}

/* ---------------------------------------------------------------- header */

.page-header {
    text-align: center;
    margin-bottom: 45px;
}

.logo {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #1e40af, var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
}

.page-title {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.6px;
    color: var(--text-heading);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 720px;
    margin: 14px auto 0;
    font-weight: 400;
}

.highlight {
    color: var(--primary);
    font-weight: 600;
}

/* ---------------------------------------------------------------- panels */

.panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 36px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-sm);
}

.panel-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 16px;
    letter-spacing: -0.3px;
}

.panel p {
    color: var(--text-main);
    font-size: 1.03rem;
}

.panel p + p,
.panel ul + p,
.panel p + ul,
.panel p + ol,
.panel div + p {
    margin-top: 16px;
}

.panel ul,
.panel ol {
    margin-left: 22px;
    color: var(--text-main);
}

.panel li + li {
    margin-top: 8px;
}

.panel h3 {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--secondary);
    letter-spacing: 1.3px;
    text-transform: uppercase;
    margin: 30px 0 10px;
}

.panel h3:first-of-type {
    margin-top: 22px;
}

.section-heading {
    text-align: center;
    margin: 50px 0 30px;
}

.section-heading h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-heading);
    letter-spacing: -0.4px;
}

.section-heading p {
    max-width: 620px;
    margin: 8px auto 0;
    color: var(--text-muted);
    font-size: 1.03rem;
}

/* ----------------------------------------------------------------- links */

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

.panel a {
    text-decoration: none;
    font-weight: 500;
}

.panel a:hover {
    text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}

strong {
    color: var(--text-heading);
    font-weight: 600;
}

/* ----------------------------------------------------------------- cards */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 28px;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: var(--shadow-sm);
    scroll-margin-top: calc(var(--nav-h) + 24px);
}

.card:hover,
.card:focus-visible {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.card-number {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 12px;
}

.card-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
    flex-grow: 1;
}

.card-cta {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 5px;
}

.card-cta::after {
    content: "\2192";
    transition: transform 0.2s ease;
}

.card:hover .card-cta::after {
    transform: translateX(4px);
}

/* ------------------------------------------------------------------ code */

code {
    background: var(--bg-subtle);
    color: #0f172a;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.88em;
    word-break: break-word;
}

pre {
    background: #0f172a;
    border-radius: 10px;
    padding: 18px 20px;
    margin: 18px 0;
    overflow-x: auto;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.84rem;
    line-height: 1.65;
    color: #cbd5e1;
    tab-size: 8;
}

pre code {
    background: none;
    border: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
    word-break: normal;
}

/* A shell prompt inside a code block */
pre .cmd {
    color: #ffffff;
    font-weight: 500;
}

pre .cmd::before {
    content: "$ ";
    color: #38bdf8;
    font-weight: 700;
}

pre .comment {
    color: #7c8ba1;
}

.code-label {
    display: inline-block;
    margin: 18px 0 -8px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1.3px;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* ----------------------------------------------------------------- table */

.table-wrap {
    overflow-x: auto;
    margin: 18px 0;
    border: 1px solid var(--border-color);
    border-radius: 10px;
}

table {
    border-collapse: collapse;
    width: 100%;
    min-width: 480px;
    font-size: 0.92rem;
    background: var(--bg-card);
}

th, td {
    text-align: left;
    padding: 11px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    vertical-align: top;
}

th {
    background: var(--bg-subtle);
    color: var(--text-heading);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 1.1px;
    text-transform: uppercase;
    white-space: nowrap;
}

tbody tr:last-child td {
    border-bottom: none;
}

td code {
    white-space: nowrap;
}

/* ----------------------------------------------------------------- notes */

.note {
    border-radius: 10px;
    padding: 16px 20px;
    margin: 20px 0;
    font-size: 0.95rem;
    border-left: 3px solid var(--primary);
    background: var(--primary-soft);
    color: var(--text-main);
}

.note.warn {
    border-left-color: #d97706;
    background: #fffbeb;
}

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

.note-label {
    display: block;
    margin-bottom: 5px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1.3px;
    text-transform: uppercase;
    color: var(--primary);
}

.note.warn .note-label {
    color: #b45309;
}

/* --------------------------------------------------------------- buttons */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    font-family: inherit;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease,
                box-shadow 0.2s ease, transform 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn:not(.secondary) {
    background-color: var(--primary);
    color: #ffffff;
}

.btn:not(.secondary):hover,
.btn:not(.secondary):focus-visible {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn.secondary {
    background-color: var(--bg-card);
    color: var(--text-main);
    border-color: var(--border-color);
}

.btn.secondary:hover,
.btn.secondary:focus-visible {
    border-color: var(--border-hover);
    background-color: var(--bg-body);
    transform: translateY(-1px);
}

/* ---------------------------------------------------------------- footer */

.site-footer {
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
    padding: 36px 0 40px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.site-footer p + p {
    margin-top: 10px;
}

.site-footer a {
    color: var(--text-muted);
    text-decoration: underline;
}

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

.footer-logos {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 34px;
    margin-bottom: 26px;
}

.footer-logos a {
    display: inline-flex;
    align-items: center;
    opacity: 0.85;
    transition: opacity 0.2s ease;
}

.footer-logos a:hover {
    opacity: 1;
}

.footer-logo-cnrs {
    height: 54px;
    width: auto;
    display: block;
}

.footer-logo-unistra {
    height: 46px;
    width: auto;
    display: block;
}

.footer-links {
    font-size: 0.88rem;
}

.footer-links a {
    white-space: nowrap;
}

.footer-links span {
    margin: 0 8px;
    color: var(--border-hover);
}

/* ------------------------------------------------------------ responsive */

@media (max-width: 768px) {
    .page-body {
        padding: 28px 0 10px;
    }
    .logo {
        font-size: 2.5rem;
    }
    .page-title {
        font-size: 1.8rem;
    }
    .subtitle {
        font-size: 1.05rem;
    }
    .panel {
        padding: 24px 20px;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
    pre {
        font-size: 0.76rem;
        padding: 14px;
    }
    .footer-logos {
        gap: 24px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}

/* ============================================================
   Copy button on code blocks (added by assets/ichem-copy.js)
   ============================================================ */

.code-block {
    position: relative;
}

/* The wrapper replaces the <pre> in the flow, so it carries the margin. */
.code-block > pre {
    margin: 0;
}

.code-block {
    margin: 18px 0;
}

.code-copy {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border-radius: 7px;
    cursor: pointer;
    color: #cbd5e1;
    background: rgba(148, 163, 184, 0.14);
    border: 1px solid rgba(148, 163, 184, 0.22);
    /* Hidden until the block is hovered or the button is focused, so it does
       not sit on top of the first line of output at rest. */
    opacity: 0;
    transition: opacity 0.15s ease, background-color 0.15s ease,
                color 0.15s ease, border-color 0.15s ease;
}

.code-block:hover .code-copy,
.code-copy:focus-visible {
    opacity: 1;
}

.code-copy:hover {
    color: #ffffff;
    background: rgba(148, 163, 184, 0.26);
    border-color: rgba(148, 163, 184, 0.4);
}

.code-copy:focus-visible {
    outline: 2px solid #38bdf8;
    outline-offset: 2px;
}

.code-copy svg {
    width: 15px;
    height: 15px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

.code-copy.is-done {
    opacity: 1;
    color: #34d399;
    background: rgba(52, 211, 153, 0.16);
    border-color: rgba(52, 211, 153, 0.36);
}

.code-copy.is-failed {
    opacity: 1;
    color: #fbbf24;
    background: rgba(251, 191, 36, 0.16);
    border-color: rgba(251, 191, 36, 0.36);
}

/* Touch devices have no hover: keep the button permanently visible. */
@media (hover: none) {
    .code-copy {
        opacity: 1;
    }
}

/* Visually hidden, still announced. */
.code-copy-status {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}