/* atome lm — warm editorial.
   Sand-cream paper, deep brown ink, terracotta accent.
   Fraunces serif for display, Inter for body, IBM Plex Mono for technical text. */

:root {
    --paper: #F4ECDD;
    --paper-2: #EADFCB;
    --paper-3: #FBF6EB;
    --ink: #1F1A14;
    --ink-2: #3A322A;
    --slate: #756B5E;
    --mute: #9C9286;
    --hair: rgba(31, 26, 20, 0.10);
    --hair-2: rgba(31, 26, 20, 0.20);
    --accent: #B84B2A;
    --accent-deep: #8C3621;
    --accent-soft: rgba(184, 75, 42, 0.10);
    --good: #4A7E3E;
    --warn: #B07C1F;
    --bad: #8E1E1E;

    --display: 'Fraunces', 'Georgia', 'Times New Roman', serif;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --max: 1120px;
    --max-narrow: 760px;

    --pad-section: clamp(3rem, 8vw, 6rem);

    /* Back-compat aliases for demo.html / timeline.html inline styles. */
    --cream: var(--paper);
    --cream-2: var(--paper-2);
    --ivory: var(--paper-3);
    --coral: var(--accent);
    --border: var(--hair);
    --surface-solid: var(--paper-3);
    --shadow-sm: 0 1px 2px rgba(31,26,20,0.05);
    --r-sm: 4px;
    --r: 6px;
    --r-lg: 10px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
html.js-loaded [data-animate] { opacity: 0; transform: translateY(8px); transition: opacity .55s ease, transform .55s ease; }
html.js-loaded [data-animate].in { opacity: 1; transform: none; }

body {
    background: var(--paper);
    background-image:
        radial-gradient(circle at 5% -5%, rgba(184, 75, 42, 0.045) 0%, transparent 35%),
        radial-gradient(circle at 95% 100%, rgba(31, 26, 20, 0.04) 0%, transparent 40%);
    color: var(--ink);
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: var(--paper-3); }

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
em { font-style: italic; font-family: var(--display); font-weight: 500; }
strong { font-weight: 600; }
code, kbd, .mono { font-family: var(--mono); font-size: 0.92em; }
code {
    background: var(--paper-3);
    padding: 0.05em 0.35em;
    border-radius: 3px;
    border: 1px solid var(--hair);
    color: var(--ink);
}

/* ---- dual-track ---- */
html[data-mode="layman"] .t-dev    { display: none !important; }
html[data-mode="dev"]    .t-layman { display: none !important; }
html[lang="en"] .l-fr { display: none !important; }
html[lang="fr"] .l-en { display: none !important; }

/* ---- nav ---- */
.nav {
    position: sticky; top: 0; z-index: 30;
    display: flex; align-items: center; justify-content: space-between;
    padding: 1.1rem clamp(1.2rem, 4vw, 2rem);
    background: rgba(244, 236, 221, 0.88);
    backdrop-filter: saturate(140%) blur(10px);
    border-bottom: 1px solid var(--hair);
    font-size: 0.92rem;
}

.nav-brand {
    display: inline-flex; align-items: center; gap: 0.6rem;
    font-family: var(--display);
    font-weight: 500;
    font-size: 1.1rem;
    letter-spacing: -0.01em;
}
.nav-brand img { width: 22px; height: 22px; }
.nav-brand .dot { color: var(--accent); }

.nav-links {
    display: flex; gap: 1.8rem; align-items: center;
    font-family: var(--mono); font-size: 0.78rem;
    text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--slate);
}
.nav-links a { transition: color .2s; }

.nav-right {
    display: flex; align-items: center; gap: 1rem;
    font-family: var(--mono); font-size: 0.78rem;
    text-transform: uppercase; letter-spacing: 0.06em;
}

.lang-toggle {
    display: inline-flex; border: 1px solid var(--hair-2);
    border-radius: 999px; overflow: hidden;
}
.lang-toggle button {
    background: transparent; border: 0; color: var(--mute);
    padding: 0.28rem 0.65rem;
    font-family: var(--mono); font-size: 0.7rem;
    text-transform: uppercase; letter-spacing: 0.08em;
    cursor: pointer;
}
.lang-toggle button.active { background: var(--ink); color: var(--paper); }

.nav-hamburger {
    display: none;
    width: 24px; height: 18px;
    flex-direction: column; justify-content: space-between;
    cursor: pointer;
}
.nav-hamburger span { height: 1.5px; background: var(--ink); display: block; }

@media (max-width: 760px) {
    .nav-links { display: none; }
    .nav.open .nav-links {
        display: flex; flex-direction: column; gap: 1rem;
        position: absolute; top: 100%; right: 0; left: 0;
        background: var(--paper); padding: 1.2rem;
        border-bottom: 1px solid var(--hair);
    }
    .nav-hamburger { display: flex; }
}

/* ---- layout ---- */
.wrap        { max-width: var(--max);        margin: 0 auto; padding: 0 clamp(1.2rem, 4vw, 2rem); }
.wrap-narrow { max-width: var(--max-narrow); margin: 0 auto; padding: 0 clamp(1.2rem, 4vw, 2rem); }

section { padding: var(--pad-section) 0; }
section + section, section.no-divider + section {
    border-top: 1px solid var(--hair);
}

.eyebrow {
    font-family: var(--mono); font-size: 0.72rem;
    text-transform: uppercase; letter-spacing: 0.16em;
    color: var(--accent);
    margin-bottom: 1.2rem;
}

h1, h2, h3, h4 {
    font-family: var(--display);
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--ink);
}
h1 {
    font-size: clamp(3.2rem, 8vw, 6rem);
    line-height: 0.98;
    letter-spacing: -0.035em;
    font-weight: 500;
}
h2 {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}
h3 {
    font-family: var(--font);
    font-size: 1.08rem;
    margin-bottom: 0.6rem;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.005em;
}
h4 { font-size: 1rem; font-weight: 600; font-family: var(--font); }

h1 em, h2 em { color: var(--accent); font-style: italic; font-weight: 400; }

.lede {
    font-size: clamp(1.1rem, 1.7vw, 1.3rem);
    color: var(--ink-2);
    line-height: 1.55;
    max-width: 58ch;
    font-weight: 400;
}

/* ---- mode toggle ---- */
.mode-toggle {
    display: inline-flex; align-items: center; gap: 0;
    border: 1px solid var(--hair-2);
    border-radius: 999px;
    padding: 0.2rem;
    margin: 1.6rem 0 2.6rem;
    background: var(--paper-3);
}
.mode-toggle button {
    background: transparent; border: 0; color: var(--slate);
    padding: 0.44rem 1.05rem;
    font-family: var(--mono); font-size: 0.74rem;
    text-transform: uppercase; letter-spacing: 0.08em;
    border-radius: 999px;
    cursor: pointer;
    transition: background .2s, color .2s;
}
.mode-toggle button.active { background: var(--ink); color: var(--paper); }

/* ---- hero ---- */
.hero {
    padding: clamp(4rem, 9vw, 7rem) 0 clamp(3rem, 6vw, 5rem);
}
.hero-mark {
    width: 96px; height: 96px;
    margin-bottom: 2.2rem;
    color: var(--ink);
}
.hero-mark svg { width: 100%; height: 100%; }
.hero-sub {
    margin-top: 1.6rem;
    max-width: 58ch;
}

.hero-stats {
    margin-top: 3rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0;
    border-top: 1px solid var(--hair);
    border-bottom: 1px solid var(--hair);
}
.hero-stats .stat {
    padding: 1.5rem 0.6rem 1.5rem 0;
    border-right: 1px solid var(--hair);
}
.hero-stats .stat:last-child { border-right: 0; }
.hero-stats .num {
    font-family: var(--display);
    font-size: 2rem;
    font-weight: 500;
    color: var(--ink);
    line-height: 1;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}
.hero-stats .lbl {
    font-family: var(--mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--slate);
}

.hero-cta {
    margin-top: 2.4rem;
    display: flex; gap: 1rem; flex-wrap: wrap;
}

.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.78rem 1.5rem;
    border-radius: 999px;
    font-family: var(--mono); font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border: 1px solid var(--ink);
    cursor: pointer;
    transition: background .2s, color .2s, border-color .2s, transform .15s;
}
.btn-primary {
    background: var(--ink);
    color: var(--paper);
}
.btn-primary:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--paper-3);
    transform: translateY(-1px);
}
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

/* ---- generic sections ---- */
.section-head { margin-bottom: 2.8rem; max-width: 60ch; }

.note {
    font-size: 0.95rem;
    color: var(--ink-2);
    padding: 1rem 1.2rem;
    border-left: 3px solid var(--accent);
    background: var(--paper-3);
}
.note strong { color: var(--ink); }

/* ---- cards ---- */
.grid { display: grid; gap: 1px; background: var(--hair); }
.grid.col-2 { grid-template-columns: repeat(2, 1fr); }
.grid.col-3 { grid-template-columns: repeat(3, 1fr); }
.grid.col-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 880px) {
    .grid.col-3, .grid.col-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
    .grid.col-2, .grid.col-3, .grid.col-4 { grid-template-columns: 1fr; }
}
.cell {
    background: var(--paper-3);
    padding: 1.7rem 1.6rem;
    transition: background .2s, color .2s;
}
.cell:hover {
    background: var(--paper-2);
}
.cell .icon {
    width: 30px; height: 30px;
    margin-bottom: 1.3rem;
    color: var(--accent);
}
.cell .icon svg { width: 100%; height: 100%; stroke: currentColor; fill: none; stroke-width: 1.4; }
.cell h3 { font-size: 1.05rem; margin-bottom: 0.5rem; font-weight: 600; }
.cell p { font-size: 0.93rem; color: var(--ink-2); line-height: 1.55; }
.cell .tag {
    display: inline-block;
    font-family: var(--mono); font-size: 0.66rem;
    color: var(--accent); text-transform: uppercase; letter-spacing: 0.12em;
    margin-bottom: 0.7rem;
    font-weight: 500;
}

/* ---- table ---- */
.table-wrap { overflow-x: auto; border: 1px solid var(--hair); background: var(--paper-3); }
table.data {
    width: 100%; border-collapse: collapse;
    font-family: var(--mono); font-size: 0.84rem;
}
table.data th, table.data td {
    padding: 0.9rem 1rem; text-align: left;
    border-bottom: 1px solid var(--hair);
    color: var(--ink-2);
}
table.data thead th {
    background: var(--paper-2);
    font-weight: 500; color: var(--ink);
    text-transform: uppercase; letter-spacing: 0.05em;
    font-size: 0.72rem;
}
table.data td.num, table.data th.num { text-align: right; }
table.data tr.highlight { background: var(--accent-soft); }
table.data tr.highlight td { color: var(--ink); font-weight: 500; }
table.data .ok  { color: var(--good); font-weight: 500; }
table.data .no  { color: var(--bad); font-weight: 500; }
table.data .ram { color: var(--warn); font-weight: 500; }

/* ---- compare strip ---- */
.compare {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
    background: var(--hair);
    margin-top: 1.6rem;
}
@media (max-width: 880px) { .compare { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .compare { grid-template-columns: 1fr; } }
.compare .col {
    background: var(--paper-3); padding: 1.5rem;
    font-family: var(--mono); font-size: 0.84rem;
}
.compare .col.us {
    background: var(--ink);
    color: var(--paper);
}
.compare .col.us .lbl { color: var(--paper-2); opacity: 0.85; }
.compare .col h4 { font-family: var(--display); font-size: 1.2rem; margin-bottom: 0.9rem; font-weight: 500; }
.compare .col.us h4 { color: var(--paper-3); }
.compare .col .lbl { color: var(--mute); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em; }
.compare .col .row { margin-top: 0.5rem; color: var(--ink); }
.compare .col.us .row { color: var(--paper-3); }

/* ---- footer ---- */
footer {
    border-top: 1px solid var(--hair);
    padding: 3.5rem 0 2.5rem;
    margin-top: 4rem;
    background: var(--paper-3);
}
.footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem;
}
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; } }
.footer-grid h5 {
    font-family: var(--mono); font-size: 0.7rem;
    text-transform: uppercase; letter-spacing: 0.1em;
    color: var(--accent); margin-bottom: 0.9rem; font-weight: 500;
}
.footer-grid a, .footer-grid p { display: block; font-size: 0.92rem; color: var(--ink-2); margin-bottom: 0.45rem; }
.footer-grid a:hover { color: var(--accent); }
.footer-brand { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.8rem; font-family: var(--display); font-size: 1.15rem; }
.footer-brand img { width: 24px; height: 24px; }
.footer-bottom {
    border-top: 1px solid var(--hair);
    margin-top: 2.5rem; padding-top: 1.5rem;
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
    font-family: var(--mono); font-size: 0.74rem;
    color: var(--mute);
}

/* ---- misc utilities ---- */
.mono-tag {
    display: inline-block;
    font-family: var(--mono); font-size: 0.7rem;
    color: var(--mute); text-transform: uppercase; letter-spacing: 0.08em;
    margin-right: 0.6rem;
}
.kbd {
    font-family: var(--mono); font-size: 0.78rem;
    padding: 0.1em 0.4em; border: 1px solid var(--hair-2);
    border-radius: 4px; background: var(--paper-3);
}