"""
Shared UI theme for biosync (modern, iMotions-style look & feel).

One design system used across the landing page, dashboard report, and replay so
everything matches: a light surface, a teal brand, soft cards, and a sticky top
bar with a Back/Home button on every screen.

Keep this the single source of styling truth — the HTML generators import
`THEME_CSS` and `topbar(...)` rather than each carrying their own styles.
"""

from __future__ import annotations

# Inline brand mark — a small pulse/waveform glyph in a rounded tile.
LOGO_SVG = (
    '<svg width="26" height="26" viewBox="0 0 32 32" fill="none" '
    'xmlns="http://www.w3.org/2000/svg" aria-hidden="true">'
    '<rect width="32" height="32" rx="8" fill="url(#bg)"/>'
    '<path d="M5 17h4l2.5-7 4 13 3-9 2 3h6.5" stroke="#fff" stroke-width="2.1" '
    'stroke-linecap="round" stroke-linejoin="round"/>'
    '<defs><linearGradient id="bg" x1="0" y1="0" x2="32" y2="32" '
    'gradientUnits="userSpaceOnUse"><stop stop-color="#2F6470"/>'
    '<stop offset="1" stop-color="#3A9AA8"/></linearGradient></defs></svg>'
)

THEME_CSS = r"""
:root{
  --bg:#eef2f4; --surface:#ffffff; --surface-2:#f7fafb;
  --ink:#16252a; --muted:#5f7378; --faint:#90a2a7;
  --primary:#2f6470; --primary-600:#27545f; --primary-50:#e9f3f5;
  --accent:#3a9aa8; --accent-50:#eaf6f8;
  --ok:#2e8b57; --warn:#c9772a; --danger:#d65745;
  --border:#e1e8ea; --ring:rgba(58,154,168,.35);
  --radius:14px; --radius-sm:9px;
  --shadow:0 1px 2px rgba(18,40,46,.06), 0 6px 18px rgba(18,40,46,.06);
  --shadow-sm:0 1px 2px rgba(18,40,46,.08);
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:var(--font);
  font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
h1,h2,h3{margin:0;font-weight:650;letter-spacing:-.01em}

/* sticky top bar with Back/Home */
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:14px;
  background:rgba(255,255,255,.85);backdrop-filter:saturate(1.2) blur(8px);
  border-bottom:1px solid var(--border);padding:11px 20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink)}
.brand .name{font-size:16px;letter-spacing:-.02em}
.brand .sub{color:var(--muted);font-weight:500;font-size:13px;
  padding-left:10px;margin-left:2px;border-left:1px solid var(--border)}
.topbar .spacer{flex:1}
.iconbtn{display:inline-flex;align-items:center;gap:7px;height:34px;padding:0 13px;
  border:1px solid var(--border);background:var(--surface);border-radius:9px;
  color:var(--ink);font-size:14px;font-weight:550;cursor:pointer;transition:.15s}
.iconbtn:hover{border-color:var(--accent);background:var(--accent-50);color:var(--primary-600)}

/* layout */
.wrap{max-width:1080px;margin:22px auto;padding:0 18px;display:grid;gap:18px}
.hero{background:linear-gradient(135deg,var(--primary) 0%,#3a8b98 55%,var(--accent) 100%);
  color:#fff;border-radius:var(--radius);padding:24px 26px;box-shadow:var(--shadow)}
.hero h1{font-size:24px;margin-bottom:4px}
.hero p{margin:0;opacity:.9;font-size:14px}

.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px 22px;box-shadow:var(--shadow)}
.card h2{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);
  margin-bottom:14px;font-weight:650}
.card.plot{padding:10px 8px 4px}

/* nav grid */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
@media(max-width:780px){.grid{grid-template-columns:1fr}}
.navcard{display:flex;gap:13px;align-items:flex-start;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius);padding:16px;
  cursor:pointer;transition:.15s;box-shadow:var(--shadow-sm)}
.navcard:hover{border-color:var(--accent);transform:translateY(-1px);box-shadow:var(--shadow)}
.navcard .ico{width:38px;height:38px;border-radius:10px;flex:0 0 auto;
  display:grid;place-items:center;background:var(--accent-50);color:var(--primary);font-size:18px}
.navcard b{display:block;font-size:15px;color:var(--ink)}
.navcard small{color:var(--muted)}

/* form controls */
label.fld{font-size:14px;color:var(--ink);display:inline-flex;align-items:center;gap:7px;
  margin-right:6px;padding:7px 11px;border:1px solid var(--border);border-radius:9px;
  background:var(--surface-2)}
input,select{font-family:inherit;font-size:14px;color:var(--ink);border:1px solid var(--border);
  border-radius:8px;padding:8px 10px;background:var(--surface);outline:none}
input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--ring)}
input[type=number]{width:74px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--primary);color:#fff;
  border:0;border-radius:10px;padding:10px 18px;font-size:15px;font-weight:600;cursor:pointer;
  transition:.15s;box-shadow:var(--shadow-sm)}
.btn:hover{background:var(--primary-600)}
.btn.rec{background:var(--danger)} .btn.rec:hover{filter:brightness(.94)}

.statline{font-size:13px;color:var(--muted);min-height:18px}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px;
  background:var(--faint);vertical-align:middle}
.dot.live{background:var(--danger);animation:pulse 1.1s infinite}
.dot.done{background:var(--ok)}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}

/* sessions list */
.rows{display:flex;flex-direction:column}
.row{display:flex;align-items:center;justify-content:space-between;padding:10px 4px;
  border-bottom:1px solid var(--border)}
.row:last-child{border-bottom:0}
.row .nm{font-variant-numeric:tabular-nums;color:var(--ink)}
.row .acts a{margin-left:12px;font-weight:550}
.empty{color:var(--faint);padding:8px 2px}
.note{font-size:12px;color:var(--faint)}
"""


def topbar(subtitle: str | None = None, back_href: str | None = None,
           back_label: str = "Home", extra: str = "") -> str:
    """Sticky brand bar. `back_href` shows a Back/Home button; `extra` is right-aligned."""
    back = ""
    if back_href:
        back = (f'<a class="iconbtn" href="{back_href}">'
                f'<span style="font-size:16px;line-height:1">&larr;</span>{back_label}</a>')
    sub = f'<span class="sub">{subtitle}</span>' if subtitle else ""
    return (
        '<div class="topbar">'
        f'{back}'
        f'<span class="brand">{LOGO_SVG}<span class="name">biosync</span>{sub}</span>'
        '<span class="spacer"></span>'
        f'{extra}'
        '</div>'
    )