/* v2-common.css — Shared component styles for V2 pages
 *
 * Contains CSS for all JS-injected components:
 *   header-common.js  →  .hdr, .logo, .burger, .slide-menu, .menu-*
 *   sidebar-common.js →  .sidebar-nav, .nav-group, .sidebar-engage, .sidebar-actions
 *   footer-common.js  →  footer, .footer-in, .footer-brand
 *   chat injection    →  .chat-section, .chat-cards
 *
 * Also: base reset, :root palette, progress bar, skip link, focus styles,
 *        mobile back-to-top button, toast notification.
 *
 * Usage:  <link rel="stylesheet" href="/css/v2-common.css">
 *         Then inline only page-specific CSS in each page's <style> block.
 *
 * Last updated: 2026-04-11
 */

/* ── BASE RESET ─────────────────────────────────────────── */
*{box-sizing:border-box;margin:0;padding:0;font-family:'Segoe UI',system-ui,-apple-system,sans-serif}

:root{
  --bg:#e8e4dd;--surface:#f5f2ec;--surface2:#ede9e1;--text:#2c2a26;--text-2:#6b6560;
  --text-3:#9c9590;--border:#d6d0c8;--border-light:#e5e1da;--accent:#b45309;
  --accent-hover:#92400e;--accent2:#7c5e3c;--header-bg:#3a3632;--header-text:#d6d0c8;
  --blue:#6366f1;--purple:#8b5cf6;--amber:#b45309;--green:#4d7c0f;--red:#be123c;--cyan:#0e7490
}

html{scroll-behavior:smooth;scroll-padding-top:70px}
body{background:var(--bg);color:var(--text);line-height:1.7}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-hover);text-decoration:underline}


/* ── HEADER (header-common.js) ──────────────────────────── */
.hdr{background:var(--header-bg);position:sticky;top:0;z-index:100;box-shadow:0 2px 8px rgba(0,0,0,.12)}
.hdr-in{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:.5rem 1.5rem}
.logo{font-size:1.2rem;font-weight:800;letter-spacing:-.5px;color:#f5f2ec;display:flex;align-items:center;gap:.4rem;text-decoration:none}
.logo:hover{text-decoration:none}
.logo-mark{flex-shrink:0}
.logo .ai{color:#93c5fd}
.logo .love{color:#fca5a5}
.hdr-r{display:flex;align-items:center;gap:.6rem}
.hdr-primary{display:flex;gap:.6rem;align-items:center}
.hdr-primary a{font-size:.78rem;font-weight:600;color:var(--header-text);transition:color .15s;text-decoration:none}
.hdr-primary a:hover{color:#fff;text-decoration:none}

/* Language switcher */
.lang-switch{display:flex;gap:.3rem;align-items:center}
.lang-flag{flex-shrink:0;border-radius:1px;vertical-align:middle}
.lang{border:1px solid rgba(255,255,255,.15);padding:.15rem .45rem;border-radius:4px;font-size:.7rem;color:var(--header-text);text-decoration:none;display:flex;align-items:center;gap:.25rem;transition:all .15s}
.lang:hover{border-color:rgba(255,255,255,.4);color:#fff;text-decoration:none;background:rgba(255,255,255,.06)}
.lang.active{border-color:var(--accent);color:#fff;background:rgba(180,83,9,.2)}

/* Hamburger button */
.burger{background:none;border:1px solid rgba(255,255,255,.15);cursor:pointer;padding:.35rem .45rem;border-radius:6px;display:flex;flex-direction:column;gap:3px;transition:border-color .15s}
.burger:hover{border-color:rgba(255,255,255,.35)}
.burger span{display:block;width:16px;height:2px;background:#d6d0c8;border-radius:2px}

/* Slide-out menu + overlay */
.menu-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:199}
.menu-overlay.open{display:block}
.slide-menu{position:fixed;top:0;right:-280px;width:280px;height:100%;background:var(--header-bg);z-index:200;transition:right .25s ease;box-shadow:-4px 0 20px rgba(0,0,0,.3);overflow-y:auto;padding:1rem 0}
.slide-menu.open{right:0}
.menu-close{background:none;border:none;color:var(--header-text);font-size:1.3rem;cursor:pointer;padding:.3rem .8rem;display:block;margin-left:auto}
.menu-close:hover{color:#fff}
.menu-section{padding:.5rem 1.2rem}
.menu-section-label{font-size:.6rem;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:rgba(214,208,200,.4);margin-bottom:.35rem}
.menu-section a{display:flex;align-items:center;gap:.5rem;padding:.5rem .4rem;font-size:.85rem;font-weight:600;color:var(--header-text);border-radius:6px;transition:background .15s;text-decoration:none}
.menu-section a:hover{background:rgba(255,255,255,.08);color:#fff;text-decoration:none}
.menu-section a .m-icon{font-size:1rem;width:22px;text-align:center;flex-shrink:0}
.menu-divider{border:none;border-top:1px solid rgba(255,255,255,.08);margin:.4rem 1.2rem}

/* Tagline next to logo */
.hdr-tagline{font-size:.65rem;color:rgba(255,255,255,.35);font-style:italic;margin-left:.6rem;white-space:nowrap}
@media(max-width:900px){.hdr-tagline{display:none}}

@media(max-width:600px){.hdr-primary{display:none}}


/* ── SIDEBAR NAV (sidebar-common.js) ────────────────────── */
.sidebar-nav{padding-top:.5rem}
.sidebar-nav .nav-group{margin-bottom:.6rem}
.sidebar-nav .nav-group-title{font-size:.63rem;font-weight:700;text-transform:uppercase;letter-spacing:.7px;color:var(--text-3);margin-bottom:.25rem;padding:.3rem .5rem;cursor:pointer;display:flex;align-items:center;justify-content:space-between;user-select:none;border-radius:5px;transition:all .15s}
.sidebar-nav .nav-group-title .chevron{font-size:.5rem;transition:transform .2s;color:var(--text-3)}
.sidebar-nav .nav-group-title:hover{color:var(--accent);background:var(--surface)}
.sidebar-nav .nav-group.collapsed .nav-group-links{display:none}
.sidebar-nav .nav-group.collapsed .chevron{transform:rotate(-90deg)}
.sidebar-nav .nav-group-links{padding:.1rem 0 0}
.sidebar-nav a{display:flex;align-items:center;gap:.4rem;font-size:.74rem;color:var(--text-2);padding:.28rem .55rem;border-radius:5px;transition:all .15s;text-decoration:none;line-height:1.3}
.sidebar-nav a:hover{color:var(--accent);background:var(--surface);text-decoration:none}
.sidebar-nav a.current-section{color:var(--accent);background:var(--surface);font-weight:600}
.sidebar-nav .nav-icon{font-size:.82rem;width:16px;text-align:center;flex-shrink:0}
.sidebar-nav .nav-count{font-size:.58rem;color:var(--text-3);margin-left:auto;background:var(--surface2);padding:.05rem .3rem;border-radius:3px;font-weight:600}
.sidebar-nav .nav-divider{border:none;border-top:1px solid var(--border-light);margin:.5rem .3rem}


/* ── SIDEBAR ENGAGE (share, social, bookmark) ───────────── */
.sidebar-engage{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:.8rem .9rem;margin-bottom:1rem}
.sidebar-engage h4{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--text-3);margin-bottom:.5rem;display:flex;align-items:center;gap:.35rem}
.sidebar-engage h4::before{content:'';display:inline-block;width:3px;height:12px;background:var(--accent);border-radius:2px}
.sidebar-social{display:grid;grid-template-columns:repeat(4,1fr);gap:.3rem;margin-bottom:.6rem}
.sidebar-social a{display:flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:6px;border:1px solid var(--border-light);background:var(--surface2);transition:all .2s;text-decoration:none}
.sidebar-social a:hover{border-color:var(--accent);transform:translateY(-1px);box-shadow:0 2px 6px rgba(0,0,0,.1);text-decoration:none}
.sidebar-social svg{width:16px;height:16px}
.sidebar-share-btn{display:flex;align-items:center;justify-content:center;gap:.4rem;width:100%;padding:.55rem .6rem;font-size:.78rem;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--accent),#d97706);border:none;border-radius:8px;cursor:pointer;transition:all .2s;font-family:inherit;box-shadow:0 2px 8px rgba(180,83,9,.2)}
.sidebar-share-btn:hover{transform:translateY(-1px);box-shadow:0 4px 14px rgba(180,83,9,.3)}
.sidebar-share-btn svg{width:15px;height:15px}
.sidebar-bookmark-btn{display:flex;align-items:center;justify-content:center;gap:.4rem;width:100%;padding:.45rem .6rem;font-size:.74rem;font-weight:600;color:var(--text-2);background:var(--surface2);border:1px solid var(--border);border-radius:8px;cursor:pointer;transition:all .2s;font-family:inherit;margin-top:.4rem}
.sidebar-bookmark-btn:hover{border-color:var(--accent);color:var(--accent)}
.sidebar-bookmark-btn svg{width:14px;height:14px}


/* ── FOOTER ─────────────────────────────────────────────── */
.ai-note{text-align:center;font-size:.7rem;color:var(--text-3);margin:.8rem auto .3rem;max-width:1200px;padding:0 1.5rem}
footer{background:var(--header-bg);color:var(--header-text);margin-top:1rem}
footer .footer-in{max-width:1140px;margin:0 auto;padding:2rem 2rem 1.5rem;display:grid;grid-template-columns:1fr auto;gap:1rem;align-items:center}
footer .footer-brand{display:flex;align-items:center;gap:.5rem;font-size:.95rem;font-weight:700;color:#f5f2ec;letter-spacing:-.3px}
footer .footer-brand .f-ai{color:#93c5fd}
footer .footer-brand .f-love{color:#fca5a5}
footer .footer-tagline{font-size:.72rem;color:rgba(214,208,200,.5);margin-top:.15rem}
footer .footer-links{display:flex;gap:.6rem;flex-wrap:wrap;justify-content:flex-end}
footer .footer-links a{font-size:.75rem;color:rgba(214,208,200,.6);text-decoration:none;padding:.2rem .4rem;border-radius:4px;transition:all .15s}
footer .footer-links a:hover{color:#fff;background:rgba(255,255,255,.08);text-decoration:none}
footer .footer-bottom{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.08);padding-top:.8rem;text-align:center;font-size:.65rem;color:rgba(214,208,200,.35)}
@media(max-width:600px){footer .footer-in{grid-template-columns:1fr;text-align:center}footer .footer-links{justify-content:center}}


/* ── CHAT SECTION ───────────────────────────────────────── */
.chat-section{margin:2rem 0 0;padding:0}
.chat-inner{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.2rem}
.engage-card-label{font-size:.78rem;font-weight:700;color:var(--text);margin-bottom:.8rem;text-align:center}
.chat-cards{display:flex;gap:.6rem;flex-wrap:wrap;justify-content:center}
.chat-card{display:flex;align-items:center;gap:.5rem;padding:.5rem .8rem;background:var(--surface2);border:1px solid var(--border);border-radius:8px;transition:all .2s;text-decoration:none}
.chat-card:hover{border-color:var(--accent);box-shadow:0 2px 8px rgba(180,83,9,.12);text-decoration:none}
.chat-logo{width:22px;height:22px;flex-shrink:0}
.chat-name{font-size:.8rem;font-weight:700;color:var(--text);display:block}
.chat-co{font-size:.62rem;color:var(--text-3);display:block}
.bottom-sections{max-width:1200px;margin:0 auto;padding:0 1.5rem}


/* ── READING PROGRESS BAR ───────────────────────────────── */
.progress-bar{position:fixed;top:42px;left:0;height:2.5px;background:linear-gradient(to right,var(--red),#e11d48);width:0%;z-index:101;transition:width .1s}


/* ── SKIP LINK ──────────────────────────────────────────── */
.skip-link{position:absolute;top:-100%;left:1rem;background:var(--accent);color:#fff;padding:.5rem 1rem;border-radius:0 0 6px 6px;font-size:.85rem;font-weight:700;z-index:1001;text-decoration:none}
.skip-link:focus{top:0}


/* ── FOCUS VISIBLE ──────────────────────────────────────── */
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
a:focus-visible{outline-offset:1px}
button:focus-visible{outline-offset:2px}


/* ── TOAST NOTIFICATION ─────────────────────────────────── */
/* ── SIDEBAR ACTION BUTTONS (copy link, print, RSS) ────── */
.sidebar-actions{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:.5rem}
.sidebar-action-btn{display:flex;align-items:center;justify-content:center;gap:.3rem;flex:1 1 calc(50% - .15rem);padding:.4rem .5rem;font-size:.68rem;font-weight:600;color:var(--text-2);background:var(--surface2);border:1px solid var(--border);border-radius:6px;cursor:pointer;transition:all .2s;font-family:inherit;text-decoration:none;white-space:nowrap}
.sidebar-action-btn:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}
.sidebar-action-btn svg{width:13px;height:13px;flex-shrink:0}

/* Sidebar back-to-top (inside sidebar) */
.sidebar-top{display:block;width:100%;padding:.4rem .6rem;font-size:.7rem;font-weight:600;color:var(--text-3);background:none;border:1px solid var(--border-light);border-radius:6px;cursor:pointer;transition:all .15s;font-family:inherit;margin-top:.5rem;text-align:center}
.sidebar-top:hover{border-color:var(--accent);color:var(--accent)}


/* ── MOBILE BACK-TO-TOP BUTTON ─────────────────────────── */
.mobile-top-btn{display:flex;position:fixed;bottom:1.5rem;right:1.5rem;width:40px;height:40px;background:var(--header-bg);color:var(--header-text);border:none;border-radius:50%;font-size:1.1rem;cursor:pointer;box-shadow:0 2px 10px rgba(0,0,0,.2);z-index:99;align-items:center;justify-content:center;transition:opacity .3s,transform .3s;opacity:0;transform:translateY(10px);pointer-events:none}
.mobile-top-btn.visible{opacity:1;transform:translateY(0);pointer-events:auto}


/* ── TOAST NOTIFICATION ─────────────────────────────────── */
.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%);background:var(--header-bg);color:#f5f2ec;padding:.6rem 1.2rem;border-radius:8px;font-size:.8rem;font-weight:600;opacity:0;transition:opacity .3s;z-index:300;pointer-events:none}
.toast.show{opacity:1}