/* =====================================================================
   Tramavia — Identité visuelle V1
   Tisser vos récits. Tracer vos voies.
   ===================================================================== */

/* ------- Variables : palette & typographie ------------------------- */

:root {
    /* Couleurs tirées du logo */
    --tramavia-bleu: #1d5c7a;           /* bleu pétrole du fil gauche */
    --tramavia-bleu-clair: #2b7ba0;
    --tramavia-bleu-fonce: #13435a;
    --tramavia-or: #c6a15b;              /* or du fil droit */
    --tramavia-or-clair: #d8b976;
    --tramavia-or-fonce: #a4833f;

    /* Fonds et textes — mode clair (papier) */
    --tramavia-ivoire: #f3eedb;          /* fond papier */
    --tramavia-ivoire-doux: #ebe5d0;
    --tramavia-encre: #1a1410;           /* texte principal */
    --tramavia-encre-douce: #3a3228;

    /* Neutres littéraires */
    --tramavia-sepia: #d8c8a8;
    --tramavia-parchemin: #e8dfc8;
    --tramavia-marge: #9b9079;           /* gris-brun discret */
    --tramavia-bordeaux: #7a1e1e;        /* rouge d'encre pour alertes */

    /* Fonts */
    --font-titre: 'Cormorant Garamond', 'Garamond', serif;
    --font-corps: 'Lora', 'Georgia', serif;
    --font-interface: 'Work Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Rythme */
    --radius: 2px;                        /* angles presque droits, comme un livre */
    --shadow-subtil: 0 1px 3px rgba(26, 20, 16, 0.08);
    --shadow-page: 0 4px 24px rgba(26, 20, 16, 0.12);

    /* Encre liquide */
    --tramavia-ink-bleed: 0 0 1px rgba(26, 20, 16, 0.15);
}

/* Mode sombre — le manuscrit à la chandelle */
[data-theme="sombre"] {
    --tramavia-ivoire: #1a1410;
    --tramavia-ivoire-doux: #241b14;
    --tramavia-encre: #e8dfce;
    --tramavia-encre-douce: #c8bda5;
    --tramavia-parchemin: #3a2f22;
    --tramavia-sepia: #4a3e30;
    --tramavia-marge: #a59a86;
    --tramavia-ink-bleed: 0 0 1px rgba(232, 223, 206, 0.15);
}

/* Mode sépia — mi-chemin, pour la lecture prolongée */
[data-theme="sepia"] {
    --tramavia-ivoire: #e8d9b8;
    --tramavia-ivoire-doux: #ddca9f;
    --tramavia-encre: #3a2818;
    --tramavia-encre-douce: #5a4230;
    --tramavia-ink-bleed: 0 0 1px rgba(58, 40, 24, 0.15);
}

/* ------- Base ------------------------------------------------------ */

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--tramavia-ivoire);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.05'/%3E%3C/svg%3E");
    background-attachment: fixed;
    color: var(--tramavia-encre);
    font-family: var(--font-corps);
    font-size: 17px;
    line-height: 1.65;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-shadow: var(--tramavia-ink-bleed);
}

/* Titres : sérif classique, poids moyen */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    font-family: var(--font-titre);
    font-weight: 500;
    color: var(--tramavia-encre);
    letter-spacing: 0.005em;
    line-height: 1.25;
}

h1, .h1 { font-size: 3.25rem; font-weight: 400; letter-spacing: -0.01em; }
h2, .h2 { font-size: 2.25rem; font-weight: 400; }
h3, .h3 { font-size: 1.75rem; }
h4, .h4 { font-size: 1.35rem; }

p {
    margin-bottom: 1.1rem;
}

.lead {
    font-family: var(--font-titre);
    font-weight: 400;
    font-style: italic;
    font-size: 1.45rem;
    color: var(--tramavia-encre-douce);
    line-height: 1.5;
}

a {
    color: var(--tramavia-bleu);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 200ms ease, color 200ms ease;
}

a:hover {
    color: var(--tramavia-bleu-fonce);
    border-bottom-color: var(--tramavia-or);
}

/* Interface : sans-serif discret */
.nav-link, .btn, .form-label, .form-control,
.form-select, .alert, .badge, .breadcrumb {
    font-family: var(--font-interface);
}

/* Override Bootstrap text-muted pour qu'il reste lisible dans tous les thèmes */
.text-muted {
    color: var(--tramavia-marge) !important;
}

.form-text {
    color: var(--tramavia-marge);
}

/* ------- Navigation ------------------------------------------------ */

.navbar {
    background: var(--tramavia-ivoire) !important;
    border-bottom: 1px solid var(--tramavia-parchemin);
    padding: 0.75rem 0;
    box-shadow: none;
}

.navbar-brand {
    font-family: var(--font-titre);
    font-size: 1.6rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--tramavia-encre) !important;
    text-transform: uppercase;
}

.navbar-brand:hover {
    color: var(--tramavia-bleu) !important;
    border-bottom-color: transparent;
}

.navbar-brand img {
    transition: transform 300ms ease;
}

.navbar-brand:hover img {
    transform: rotate(-4deg);
}

.nav-link {
    color: var(--tramavia-encre-douce) !important;
    font-size: 0.95rem;
    font-weight: 400;
    padding: 0.5rem 1rem !important;
    transition: color 200ms ease;
}

.nav-link:hover {
    color: var(--tramavia-bleu) !important;
}

/* ------- Boutons : plats, sobres, sans gradient -------------------- */

.btn {
    border-radius: var(--radius);
    padding: 0.55rem 1.4rem;
    font-weight: 500;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
    transition: all 200ms ease;
    border-width: 1px;
}

.btn-primary {
    background-color: var(--tramavia-bleu);
    border-color: var(--tramavia-bleu);
    color: var(--tramavia-ivoire);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--tramavia-bleu-fonce);
    border-color: var(--tramavia-bleu-fonce);
    color: var(--tramavia-ivoire);
    transform: translateY(-1px);
    box-shadow: var(--shadow-subtil);
}

.btn-outline-primary {
    background-color: transparent;
    border-color: var(--tramavia-encre-douce);
    color: var(--tramavia-encre);
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
    background-color: var(--tramavia-encre);
    border-color: var(--tramavia-encre);
    color: var(--tramavia-ivoire);
}

.btn-or {
    background-color: var(--tramavia-or);
    border-color: var(--tramavia-or);
    color: var(--tramavia-encre);
}

.btn-or:hover {
    background-color: var(--tramavia-or-fonce);
    border-color: var(--tramavia-or-fonce);
    color: var(--tramavia-ivoire);
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1rem;
}

/* ------- Formulaires ---------------------------------------------- */

.form-control,
.form-select {
    background-color: var(--tramavia-ivoire);
    border: 1px solid var(--tramavia-parchemin);
    border-radius: var(--radius);
    color: var(--tramavia-encre);
    padding: 0.65rem 0.9rem;
    font-size: 1rem;
    transition: border-color 200ms ease;
}

.form-control:focus,
.form-select:focus {
    background-color: var(--tramavia-ivoire);
    border-color: var(--tramavia-bleu);
    color: var(--tramavia-encre);
    box-shadow: 0 0 0 3px rgba(29, 92, 122, 0.12);
}

.form-label {
    color: var(--tramavia-encre-douce);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    margin-bottom: 0.4rem;
}

.form-check-input:checked {
    background-color: var(--tramavia-bleu);
    border-color: var(--tramavia-bleu);
}

/* ------- Cards : pages de manuscrit ------------------------------- */

.card {
    background-color: var(--tramavia-ivoire);
    border: 1px solid var(--tramavia-parchemin);
    border-radius: var(--radius);
    box-shadow: var(--shadow-subtil);
}

.card-header {
    background-color: var(--tramavia-ivoire-doux);
    border-bottom: 1px solid var(--tramavia-parchemin);
    padding: 1rem 1.5rem;
}

.card-header h4 {
    margin: 0;
    font-size: 1.3rem;
}

.card-body {
    padding: 1.75rem;
}

/* ------- Alertes : sobres, pas de bulles vives -------------------- */

.alert {
    border-radius: var(--radius);
    border-width: 1px;
    border-style: solid;
    padding: 0.85rem 1.1rem;
    font-size: 0.95rem;
}

.alert-success {
    background-color: rgba(63, 90, 63, 0.08);
    border-color: rgba(63, 90, 63, 0.25);
    color: #3f5a3f;
}

.alert-danger {
    background-color: rgba(122, 30, 30, 0.08);
    border-color: rgba(122, 30, 30, 0.25);
    color: var(--tramavia-bordeaux);
}

.alert-info {
    background-color: rgba(29, 92, 122, 0.08);
    border-color: rgba(29, 92, 122, 0.25);
    color: var(--tramavia-bleu-fonce);
}

/* ------- Ornements littéraires ------------------------------------ */

/* Fleuron séparateur */
.ornement {
    display: block;
    text-align: center;
    color: var(--tramavia-or);
    font-size: 1.4rem;
    margin: 2.5rem 0;
    letter-spacing: 0.8em;
}

.ornement::before {
    content: "❦";
}

.ornement-triple::before {
    content: "⁂";
}

/* Filet horizontal avec fleuron central */
hr.filet {
    border: none;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--tramavia-marge) 20%,
        var(--tramavia-marge) 80%,
        transparent 100%
    );
    margin: 2rem 0;
    position: relative;
}

hr.filet::after {
    content: "❦";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--tramavia-ivoire);
    padding: 0 0.8rem;
    color: var(--tramavia-or);
    font-size: 0.9rem;
}

/* Petites capitales élégantes */
.petites-capitales {
    font-variant: small-caps;
    letter-spacing: 0.04em;
}

/* ------- Hero d'accueil ------------------------------------------- */

.hero {
    text-align: center;
    padding: 5rem 1rem 4rem;
}

.hero-logo {
    max-width: 320px;
    width: 100%;
    height: auto;
    margin-bottom: 2rem;
}

.hero-tagline {
    font-family: var(--font-titre);
    font-style: italic;
    font-size: 1.6rem;
    color: var(--tramavia-encre-douce);
    letter-spacing: 0.02em;
    margin-bottom: 0.5rem;
}

.hero-etymologie {
    font-size: 0.95rem;
    color: var(--tramavia-marge);
    font-style: italic;
    margin-bottom: 2.5rem;
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

/* Section "trois piliers" */
.piliers {
    padding: 3rem 0;
}

.pilier {
    text-align: center;
    padding: 1.5rem 1rem;
}

.pilier-verbe {
    font-family: var(--font-titre);
    font-size: 1.8rem;
    color: var(--tramavia-bleu);
    margin-bottom: 0.75rem;
    font-style: italic;
}

.pilier-verbe:nth-of-type(2n) {
    color: var(--tramavia-or-fonce);
}

.pilier-description {
    color: var(--tramavia-encre-douce);
    font-size: 1rem;
    line-height: 1.6;
}

/* ------- Feature cards (landing) ---------------------------------- */

.feature-card {
    text-align: center;
    padding: 1.5rem 1.2rem;
    height: 100%;
}
.feature-ornement {
    font-size: 2.2rem;
    color: var(--tramavia-or-fonce, #9b7a2b);
    line-height: 1;
    margin-bottom: 0.8rem;
}
.feature-card h3 {
    font-family: var(--font-titre);
    font-size: 1.25rem;
    color: var(--tramavia-encre);
    margin: 0 0 0.6rem;
    font-weight: 500;
}
.feature-card p {
    color: var(--tramavia-encre-douce);
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0;
}


/* ------- Footer --------------------------------------------------- */

.footer {
    background-color: var(--tramavia-parchemin);
    border-top: 1px solid var(--tramavia-sepia);
    padding: 3rem 0 2rem;
    margin-top: 5rem;
    color: var(--tramavia-encre-douce);
    font-size: 0.9rem;
}

.footer h5 {
    font-family: var(--font-titre);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--tramavia-encre);
    margin-bottom: 1rem;
    letter-spacing: 0.04em;
}

.footer a {
    color: var(--tramavia-encre-douce);
    display: inline-block;
    padding: 0.15rem 0;
}

.footer a:hover {
    color: var(--tramavia-bleu);
}

.footer-bottom {
    border-top: 1px solid var(--tramavia-sepia);
    padding-top: 1.25rem;
    margin-top: 2rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--tramavia-marge);
}

/* ------- Responsive ----------------------------------------------- */

@media (max-width: 768px) {
    body { font-size: 16px; }
    h1, .h1 { font-size: 2.2rem; }
    h2, .h2 { font-size: 1.7rem; }
    .hero { padding: 3rem 1rem 2rem; }
    .hero-logo { max-width: 220px; }
    .hero-tagline { font-size: 1.3rem; }
}

/* Aide contextuelle ⓘ (Phase 10.C) */
.aide-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.1em;
    height: 1.1em;
    margin-left: 0.35em;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--tramavia-or-fonce, #9b7a2b);
    opacity: 0.55;
    cursor: help;
    font-size: 0.95em;
    line-height: 1;
    vertical-align: middle;
    transition: opacity 150ms ease, transform 150ms ease;
}
.aide-ico:hover, .aide-ico:focus {
    opacity: 1;
    transform: scale(1.1);
    outline: none;
}
.popover a { color: var(--tramavia-or-fonce, #9b7a2b); }

/* ------- Effets "Chandelle" en mode sombre ------------------------ */
[data-theme="sombre"] body::after {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    box-shadow: inset 0 0 15vmin rgba(0, 0, 0, 0.65);
    pointer-events: none;
    z-index: 9999;
}

/* ------- Navbar dynamique (estompage) ----------------------------- */
.navbar {
    transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
}
.navbar.navbar-hidden {
    transform: translateY(-100%);
    opacity: 0;
}

/* Bouton Scriptorium Ex-Libris */
.nav-ex-libris {
    font-family: var(--font-titre) !important;
    font-size: 1.1rem !important;
    font-style: italic;
    border: 1px solid var(--tramavia-or);
    padding: 0.3rem 0.8rem !important;
    border-radius: var(--radius);
    color: var(--tramavia-or) !important;
    margin-left: 0.5rem;
    position: relative;
    overflow: hidden;
}
.nav-ex-libris::before {
    content: "✒";
    font-size: 0.8em;
    margin-right: 0.4em;
    font-style: normal;
}
.nav-ex-libris:hover {
    background-color: var(--tramavia-or);
    color: var(--tramavia-ivoire) !important;
}

/* ------- Hero Re-design ------------------------------------------- */
.hero-logo {
    animation: tissage-logo 3s ease-out;
}

@keyframes tissage-logo {
    0% { opacity: 0; transform: scale(0.95); filter: blur(3px); }
    100% { opacity: 1; transform: scale(1); filter: blur(0); }
}

.manuscrit-vivant {
    font-family: var(--font-corps);
    font-style: italic;
    font-size: 1.2rem;
    color: var(--tramavia-encre-douce);
    min-height: 3rem;
    position: relative;
    display: inline-block;
    padding-right: 1rem;
}

.manuscrit-vivant::after {
    content: '';
    position: absolute;
    right: 0;
    top: 10%;
    height: 80%;
    width: 2px;
    background-color: var(--tramavia-or);
    animation: blink-caret 1s infinite;
}

@keyframes blink-caret {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* ------- Piliers asymétriques ------------------------------------- */
.pilier-asymetrique {
    position: relative;
    padding: 2rem;
    z-index: 1;
}

.pilier-asymetrique:nth-child(even) {
    transform: translateY(2rem);
}

.pilier-lettrine {
    position: absolute;
    top: -1rem;
    left: 1rem;
    font-family: var(--font-titre);
    font-size: 8rem;
    color: var(--tramavia-or);
    opacity: 0.15;
    z-index: -1;
    line-height: 1;
    user-select: none;
}

/* ------- Footer Colophon ------------------------------------------ */
.colophon-footer {
    text-align: center;
    border-top: 1px solid var(--tramavia-sepia);
    padding: 4rem 0 3rem;
    margin-top: 5rem;
    background: transparent;
}

.colophon-logo {
    font-size: 2rem;
    color: var(--tramavia-or);
    margin-bottom: 1rem;
}

.colophon-links {
    margin: 2rem 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.colophon-links a {
    color: var(--tramavia-encre-douce);
    font-style: italic;
    font-size: 1.05rem;
}

.colophon-lang-selector {
    margin: 2rem 0;
    font-family: var(--font-titre);
    font-size: 1.2rem;
    color: var(--tramavia-marge);
}

.colophon-lang-selector a {
    color: var(--tramavia-encre-douce);
    margin: 0 0.5rem;
    text-decoration: none;
}

.colophon-lang-selector a.active {
    color: var(--tramavia-or);
    font-weight: 600;
}