/* ─── monnaie.css — Thème : Bronze antique, pièce, histoire millénaire ─────── */
@import url('https://fonts.googleapis.com/css2?family=Cinzel+Decorative:wght@400;700&family=Lato:ital,wght@0,300;0,400;0,700;1,300;1,400&family=Philosopher:ital,wght@0,400;0,700;1,400;1,700&family=Courier+New:wght@400&display=swap');

:root {
  --obsidian:#080608; --deep:#10090e; --surface:#1a1018;
  --surface-2:#241622; --surface-3:#301d2c;
  --copper:#b87333; --copper-2:#d4913a; --copper-3:#e8ac50;
  --copper-glow:rgba(184,115,51,.22); --copper-pale:rgba(184,115,51,.08);
  --copper-mid:rgba(184,115,51,.35);
  --patina:#4a7c5c; --patina-pale:rgba(74,124,92,.08);
  --silver:#9ab0c0; --silver-pale:rgba(154,176,192,.08);
  --crimson:#8b1a1a; --crimson-pale:rgba(139,26,26,.08);
  --ink:#e8dcc8; --ink-mid:#a09070; --ink-dim:#4a3828;
  --border:rgba(184,115,51,.16); --border-hi:rgba(184,115,51,.45);
  --font-display:'Cinzel Decorative',serif;
  --font-body:'Philosopher',Georgia,serif;
  --font-sans:'Lato',sans-serif;
  --font-mono:'Courier New',Courier,monospace;
  --sidebar-w:268px; --radius:4px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}

body{
  font-family:var(--font-body);background:var(--obsidian);color:var(--ink);font-size:17px;line-height:1.82;
  background-image:
    radial-gradient(ellipse at 30% 10%,rgba(184,115,51,.06) 0,transparent 50%),
    radial-gradient(ellipse at 70% 90%,rgba(74,124,92,.04) 0,transparent 40%),
    repeating-linear-gradient(45deg,transparent,transparent 60px,rgba(184,115,51,.015) 60px,rgba(184,115,51,.015) 61px);
  background-attachment:fixed;
}

.progress-bar{position:fixed;top:0;left:0;height:3px;width:0%;background:linear-gradient(90deg,var(--copper),var(--copper-3),var(--copper));z-index:200;transition:width .08s linear;box-shadow:0 0 8px var(--copper-glow);}

.page-layout{display:flex;min-height:100vh;}

.sidebar{
  width:var(--sidebar-w);flex-shrink:0;background:var(--deep);border-right:1px solid var(--border);
  position:sticky;top:0;height:100vh;overflow-y:auto;display:flex;flex-direction:column;
  scrollbar-width:thin;scrollbar-color:var(--surface-3) transparent;
}
.sidebar-header{
  padding:28px 22px 22px;border-bottom:1px solid var(--border);position:relative;overflow:hidden;
}
/* Coin emboss decoration */
.sidebar-header::before{
  content:'⊙';position:absolute;right:-12px;top:-12px;font-size:5rem;color:rgba(184,115,51,.06);pointer-events:none;line-height:1;
}
.sidebar-site-link{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.12em;color:var(--ink-dim);text-decoration:none;display:block;margin-bottom:12px;}
.sidebar-title{font-family:var(--font-display);font-size:1.1rem;font-weight:700;color:var(--copper-2);line-height:1.3;letter-spacing:.04em;}
.toc-nav{padding:12px 0 16px;flex:1;}
.toc-section-label{font-family:var(--font-mono);font-size:.58rem;letter-spacing:.2em;text-transform:uppercase;color:var(--ink-dim);padding:10px 22px 4px;}
.toc-link{display:block;padding:5px 22px 5px 26px;font-family:var(--font-body);font-size:.87rem;color:var(--ink-mid);text-decoration:none;border-left:2px solid transparent;transition:all .15s;}
.toc-link:hover,.toc-link.active{color:var(--copper-2);border-left-color:var(--copper);background:var(--copper-pale);}
.toc-link.active{color:var(--copper-3);}
.sidebar-subject-nav{padding:14px 22px;border-top:1px solid var(--border);}
.sidebar-subject-nav p{font-family:var(--font-mono);font-size:.58rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-dim);margin-bottom:8px;}
.sidebar-subject-nav a{display:block;font-family:var(--font-sans);font-size:.82rem;color:var(--ink-dim);text-decoration:none;padding:3px 0;transition:color .15s;}
.sidebar-subject-nav a:hover{color:var(--copper-2);}
.sidebar-subject-nav a.current{color:var(--copper-2);font-weight:700;}

.main{flex:1;min-width:0;padding:0 58px 100px;max-width:840px;}

.page-header{padding:58px 0 40px;margin-bottom:52px;border-bottom:1px solid var(--border);position:relative;}
.page-header::after{content:'';position:absolute;bottom:-1px;left:0;width:100px;height:1px;background:var(--copper);box-shadow:0 0 12px var(--copper-glow);}
.subject-tag{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.22em;text-transform:uppercase;color:var(--copper-2);margin-bottom:14px;}
h1.page-title{font-family:var(--font-display);font-size:2.8rem;font-weight:700;color:var(--ink);line-height:1.0;letter-spacing:.04em;text-shadow:0 0 30px var(--copper-glow);}
.page-intro{margin-top:18px;font-size:1.05rem;color:var(--ink-mid);font-style:italic;max-width:540px;font-family:var(--font-body);}

.section{margin-bottom:62px;scroll-margin-top:28px;}
h2.section-title{font-family:var(--font-display);font-size:1.45rem;font-weight:700;color:var(--copper-2);margin-bottom:20px;padding-bottom:10px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px;letter-spacing:.04em;}
h2.section-title .num{font-family:var(--font-mono);font-size:.68rem;color:var(--obsidian);background:var(--copper);padding:3px 9px;border-radius:3px;font-weight:400;box-shadow:0 0 6px var(--copper-glow);}
h3.sub-title{font-family:var(--font-display);font-size:1.05rem;font-weight:700;color:var(--copper-3);margin:28px 0 12px;letter-spacing:.04em;}
p{margin-bottom:.92em;}ul,ol{padding-left:1.5em;margin-bottom:.9em;}li{margin-bottom:.3em;}

.box{padding:17px 21px 15px;margin:20px 0;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);}
.box-label{font-family:var(--font-mono);font-size:.62rem;font-weight:500;letter-spacing:.15em;text-transform:uppercase;display:block;margin-bottom:8px;}
.box.def{background:var(--copper-pale);border-color:var(--copper-mid);}
.box.def .box-label{color:var(--copper-2);}
.box.theorem{background:var(--patina-pale);border-color:rgba(74,124,92,.3);}
.box.theorem .box-label{color:var(--patina);}
.box.prop{background:var(--silver-pale);border-color:rgba(154,176,192,.25);}
.box.prop .box-label{color:var(--silver);}
.box.corollary{background:var(--crimson-pale);border-color:rgba(139,26,26,.25);}
.box.corollary .box-label{color:var(--crimson);}
.box.example{background:rgba(232,172,80,.05);border-color:rgba(232,172,80,.2);}
.box.example .box-label{color:var(--copper-3);}
.box.remark{background:var(--surface-2);border-color:var(--border);}
.box.remark .box-label{color:var(--ink-mid);}

.proof-toggle{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-body);font-style:italic;font-size:.9rem;color:var(--copper-2);border:1px solid var(--copper-mid);padding:4px 14px;border-radius:3px;cursor:pointer;background:transparent;margin-top:8px;transition:all .18s;user-select:none;}
.proof-toggle:hover{background:var(--copper);color:var(--obsidian);box-shadow:0 0 10px var(--copper-glow);}
.proof-toggle .arrow{transition:transform .2s;font-style:normal;}
.proof-toggle.open .arrow{transform:rotate(90deg);}
.proof-content{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.proof-content.open{max-height:900px;}
.proof-inner{margin-top:12px;padding:14px 18px;background:var(--surface-2);border:1px dashed var(--border);border-radius:var(--radius);color:var(--ink-mid);font-size:.95rem;font-style:italic;}
.qed{float:right;color:var(--copper-2);font-family:var(--font-mono);font-size:.82rem;font-style:normal;}

.formula-block{text-align:center;padding:20px 16px;margin:16px 0;background:var(--obsidian);border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto;box-shadow:0 0 14px rgba(184,115,51,.04);}

.math-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.9rem;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);}
.math-table th{background:var(--surface-3);color:var(--copper-2);padding:10px 14px;text-align:left;font-family:var(--font-display);font-size:.82rem;letter-spacing:.06em;border-bottom:1px solid var(--border-hi);}
.math-table td{padding:9px 14px;border-bottom:1px solid var(--border);vertical-align:top;}
.math-table tr:hover td{background:var(--copper-pale);}
.math-table td:first-child{font-family:var(--font-mono);font-size:.8rem;color:var(--copper-2);}
code{font-family:var(--font-mono);font-size:.82em;background:var(--surface-2);color:var(--copper-3);padding:2px 6px;border-radius:3px;border:1px solid var(--border);}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:14px 0;}
.two-col .box{margin:0;}

.mobile-header{display:none;position:sticky;top:0;z-index:50;background:var(--deep);border-bottom:1px solid var(--border);padding:12px 18px;align-items:center;justify-content:space-between;}
.mobile-menu-btn{background:none;border:none;color:var(--copper-2);font-size:1.3rem;cursor:pointer;}
.mobile-title{font-family:var(--font-display);font-size:.9rem;color:var(--copper-2);letter-spacing:.04em;}
.mobile-drawer{display:none;position:fixed;inset:0;z-index:100;}
.mobile-drawer.open{display:flex;}
.drawer-overlay{position:absolute;inset:0;background:rgba(0,0,0,.75);}
.drawer-panel{position:relative;z-index:1;width:268px;background:var(--deep);height:100%;overflow-y:auto;padding:16px 0;border-right:1px solid var(--border);}
@media(max-width:960px){.sidebar{display:none;}.mobile-header{display:flex;}.main{padding:0 20px 70px;}h1.page-title{font-size:2.2rem;}.two-col{grid-template-columns:1fr;}}