/* =====================================================================
   INFRAMINE — style.css
   Direction artistique : Ingénierie & Souveraineté
   Typographie : IBM Plex Sans (300/400/500/600) + IBM Plex Mono (noeuds, refs)
   Palette : Fond marine profond (#09101F), Surface (#111827), Cuivre (#C4963A)
   Conformité : RGPD, CNIL, ANSSI, Accessibilité WCAG AA
   ===================================================================== */

/* ── 1. Variables & Reset ────────────────────────────────────────── */
:root {
    --bg:         #09101F;
    --surface:    #111827;
    --surface-elevated: #162032;
    --border:     #1D2B3A;
    --border-subtle: rgba(29, 43, 58, 0.6);
    --text:       #D4DDE8;
    --text-bright: #FFFFFF;
    --muted:      #6E7F91;
    --muted-light:#8E9FA5;
    --copper:     #C4963A;
    --copper-hi:  #D4A94A;
    --copper-dim: rgba(196, 150, 58, 0.15);
    --error:      #E07575;
    --sans:       'IBM Plex Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --mono:       'IBM Plex Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    --max-w:      1160px;
    --pad-x:      2rem;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-weight: 300;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img, svg { display: block; }

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    background: transparent;
    border: none;
    cursor: pointer;
}

/* ── 2. Header & Navigation ──────────────────────────────────────── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(9, 16, 31, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 1.125rem var(--pad-x);
}

.wordmark {
    font-family: var(--sans);
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
    color: var(--text-bright);
    line-height: 1;
}

.wordmark span {
    color: var(--copper);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.75rem;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--muted);
    transition: color 0.18s ease;
}

.nav-link:hover {
    color: var(--text-bright);
}

.nav-contact {
    color: var(--copper);
}

.nav-contact:hover {
    color: var(--copper-hi);
}

/* ── 3. Hero Section ─────────────────────────────────────────────── */
.hero {
    min-height: calc(100vh - 65px);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.hero-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 4.5rem;
    align-items: center;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 5rem var(--pad-x);
    width: 100%;
}

.trust-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0.75rem;
    background: rgba(29, 43, 58, 0.45);
    border: 1px solid var(--border);
    border-radius: 2px;
    font-size: 0.775rem;
    font-family: var(--mono);
    color: var(--muted-light);
    margin-bottom: 1.5rem;
}

.trust-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--copper);
    box-shadow: 0 0 6px var(--copper);
}

h1 {
    font-size: clamp(2rem, 3.8vw, 3.125rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 1.35rem;
    color: var(--text-bright);
    max-width: 24ch;
}

.hero-lead {
    font-size: 1.0625rem;
    font-weight: 300;
    color: var(--muted);
    line-height: 1.7;
    margin-bottom: 2.25rem;
    max-width: 54ch;
}

/* ── 4. Formulaire & RGPD ────────────────────────────────────────── */
#capture-area {
    max-width: 520px;
}

.form-row {
    display: flex;
    border: 1px solid var(--border);
    border-radius: 3px;
    background: var(--surface);
    overflow: hidden;
    transition: border-color 0.18s ease;
}

.form-row:focus-within {
    border-color: var(--copper);
}

#waitlist-form input[type="email"] {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: none;
    outline: none;
    padding: 0.95rem 1rem;
    font-family: var(--sans);
    font-size: 0.9375rem;
    font-weight: 300;
    color: var(--text-bright);
}

#waitlist-form input[type="email"]::placeholder {
    color: var(--muted);
    opacity: 0.7;
}

#waitlist-form button[type="submit"] {
    flex-shrink: 0;
    background: var(--copper);
    color: #ffffff;
    border: none;
    cursor: pointer;
    padding: 0.95rem 1.4rem;
    font-family: var(--sans);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    white-space: nowrap;
    transition: background 0.18s ease;
    line-height: 1;
}

#waitlist-form button[type="submit"]:hover {
    background: var(--copper-hi);
}

#waitlist-form button[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Consentement RGPD / CNIL */
.consent-block {
    margin-top: 0.85rem;
}

.consent-label {
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
    font-size: 0.785rem;
    font-weight: 300;
    color: var(--muted);
    line-height: 1.45;
    cursor: pointer;
}

.consent-label input[type="checkbox"] {
    margin-top: 0.2rem;
    flex-shrink: 0;
    accent-color: var(--copper);
    width: 14px;
    height: 14px;
    cursor: pointer;
}

.inline-link {
    display: inline;
    color: var(--copper);
    text-decoration: underline;
    text-underline-offset: 2px;
    font-size: inherit;
    padding: 0;
    cursor: pointer;
}

.inline-link:hover {
    color: var(--copper-hi);
}

.form-error {
    display: block;
    margin-top: 0.6rem;
    font-size: 0.825rem;
    color: var(--error);
    min-height: 1.25em;
}

.form-success {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    padding: 1rem 1.15rem;
    background: rgba(196, 150, 58, 0.08);
    border: 1px solid rgba(196, 150, 58, 0.3);
    border-radius: 3px;
    font-size: 0.9375rem;
    font-weight: 300;
    color: var(--text-bright);
    line-height: 1.6;
}

.success-icon {
    color: var(--copper);
    font-weight: 600;
    flex-shrink: 0;
    line-height: 1.6;
}

.form-note {
    margin-top: 0.85rem;
    font-size: 0.75rem;
    font-weight: 300;
    color: var(--muted);
    opacity: 0.8;
}

/* ── 5. Diagramme SVG de topologie ────────────────────────────────── */
.hero-diagram {
    width: 400px;
}

.hero-diagram svg {
    width: 100%;
    height: auto;
}

.tl {
    stroke-dasharray: 250;
    stroke-dashoffset: 250;
    animation: tl-draw 0.5s ease forwards var(--d, 0s);
}

.tn {
    opacity: 0;
    animation: tn-fade 0.35s ease forwards var(--d, 0s);
}

@keyframes tl-draw {
    to { stroke-dashoffset: 0; }
}

@keyframes tn-fade {
    to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
    .tl { stroke-dashoffset: 0; animation: none; }
    .tn { opacity: 1; animation: none; }
}

/* ── 6. Sections Spécifications & Sécurité (Style Référentiel) ────── */
.specs-section {
    padding: 5.5rem 0;
    border-bottom: 1px solid var(--border);
}

.section-container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 var(--pad-x);
}

.section-header {
    margin-bottom: 3.5rem;
    max-width: 650px;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-bright);
    margin-bottom: 0.65rem;
}

.section-desc {
    font-size: 0.95rem;
    font-weight: 300;
    color: var(--muted);
    line-height: 1.6;
}

/* Format tableau technique (Pas de cartes génériques) */
.specs-table {
    display: flex;
    flex-direction: column;
}

.spec-row {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 3rem;
    padding: 2.25rem 0;
    border-bottom: 1px solid var(--border);
    align-items: baseline;
}

.spec-row:first-child {
    border-top: 1px solid var(--border);
}

.spec-meta {
    font-family: var(--mono);
    font-size: 0.825rem;
    color: var(--copper);
    letter-spacing: -0.01em;
    padding-top: 0.15rem;
}

.spec-body h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-bright);
    letter-spacing: -0.01em;
    margin-bottom: 0.45rem;
}

.spec-body p {
    font-size: 0.9375rem;
    font-weight: 300;
    color: var(--muted);
    line-height: 1.7;
    max-width: 64ch;
}

/* ── 7. FAQ Technique ────────────────────────────────────────────── */
.faq-list {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--border);
}

.faq-item {
    border-bottom: 1px solid var(--border);
    transition: background 0.18s ease;
}

.faq-item[open] {
    background: rgba(17, 24, 39, 0.4);
}

.faq-question {
    padding: 1.5rem 0;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-bright);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

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

.faq-question::after {
    content: "+";
    font-family: var(--mono);
    font-size: 1.15rem;
    color: var(--copper);
    font-weight: 400;
    transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
    content: "−";
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 0 1.5rem;
    font-size: 0.9375rem;
    font-weight: 300;
    color: var(--muted);
    line-height: 1.7;
    max-width: 68ch;
}

/* ── 8. Deuxième CTA de Bas de Page ──────────────────────────────── */
.bottom-cta {
    padding: 5rem 0;
    background: rgba(17, 24, 39, 0.3);
    border-bottom: 1px solid var(--border);
}

.bottom-cta-inner {
    text-align: left;
    max-width: var(--max-w);
}

.bottom-cta h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 0.5rem;
}

.bottom-cta p {
    font-size: 0.95rem;
    color: var(--muted);
    margin-bottom: 1.75rem;
}

.btn-cta-anchor {
    display: inline-block;
    background: var(--copper);
    color: #ffffff;
    padding: 0.85rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 2px;
    transition: background 0.18s ease;
}

.btn-cta-anchor:hover {
    background: var(--copper-hi);
}

/* ── 9. Footer Institutionnel & Légal ────────────────────────────── */
.site-footer {
    padding: 2.5rem 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 var(--pad-x);
    font-size: 0.8125rem;
    font-weight: 300;
    color: var(--muted);
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.footer-license {
    color: var(--muted);
    font-size: 0.775rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--muted);
    font-size: 0.8125rem;
    transition: color 0.18s ease;
    padding: 0;
}

.footer-link:hover {
    color: var(--text-bright);
}

/* ── 10. Modales Légales Natives (<dialog>) ──────────────────────── */
.legal-dialog {
    border: none;
    background: transparent;
    padding: 1.5rem;
    max-width: 680px;
    width: calc(100% - 2rem);
    margin: auto;
}

.legal-dialog::backdrop {
    background: rgba(4, 7, 14, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.dialog-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text);
    display: flex;
    flex-direction: column;
    max-height: 80vh;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

.dialog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.dialog-header h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-bright);
    letter-spacing: -0.01em;
}

.dialog-close {
    font-size: 1.15rem;
    color: var(--muted);
    padding: 0.25rem 0.5rem;
    transition: color 0.18s ease;
}

.dialog-close:hover {
    color: var(--text-bright);
}

.dialog-body {
    padding: 1.5rem;
    overflow-y: auto;
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--muted);
}

.dialog-body h4 {
    font-size: 0.925rem;
    font-weight: 600;
    color: var(--text-bright);
    margin: 1.25rem 0 0.4rem;
}

.dialog-body h4:first-child {
    margin-top: 0;
}

.dialog-body p {
    margin-bottom: 0.75rem;
}

.dialog-body ul {
    margin-left: 1.25rem;
    margin-bottom: 0.75rem;
}

.dialog-body li {
    margin-bottom: 0.35rem;
}

.dialog-body a {
    color: var(--copper);
    text-decoration: underline;
}

.license-text {
    font-family: var(--mono);
    font-size: 0.785rem;
    white-space: pre-wrap;
    background: var(--bg);
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--text);
    line-height: 1.5;
}

.dialog-footer {
    display: flex;
    justify-content: flex-end;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
    background: var(--bg);
}

.dialog-btn {
    background: rgba(29, 43, 58, 0.6);
    color: var(--text-bright);
    border: 1px solid var(--border);
    padding: 0.5rem 1.25rem;
    font-size: 0.825rem;
    font-weight: 500;
    border-radius: 2px;
    transition: background 0.18s ease;
}

.dialog-btn:hover {
    background: var(--border);
}

/* ── 11. Accessibilité & Focus Clavier ───────────────────────────── */
:focus-visible {
    outline: 2px solid var(--copper);
    outline-offset: 3px;
    border-radius: 2px;
}

/* ── 12. Responsive Design ───────────────────────────────────────── */
@media (max-width: 960px) {
    .hero-layout {
        grid-template-columns: 1fr;
        padding-top: 4rem;
        padding-bottom: 4rem;
    }

    .hero-diagram {
        display: none;
    }

    .hero {
        min-height: auto;
    }

    .spec-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
}

@media (max-width: 680px) {
    :root {
        --pad-x: 1.25rem;
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.85rem;
    }

    .nav-menu {
        flex-wrap: wrap;
        gap: 1rem;
    }

    .form-row {
        flex-direction: column;
    }

    #waitlist-form button[type="submit"] {
        width: 100%;
        padding: 0.875rem;
        text-align: center;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
}