reclaim/app/lib/pages/about_page.dart

import 'package:flutter/material.dart';

import '../theme/lawheatmap_tokens.dart';
import '../widgets/lawheatmap_card.dart';

class AboutPage extends StatelessWidget {
  const AboutPage({super.key});

  @override
  Widget build(BuildContext context) {
    final t = Theme.of(context).textTheme;
    return SingleChildScrollView(
      padding: const EdgeInsets.all(LawHeatmapSpace.xl),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text('Methodik & Quellen', style: t.displaySmall),
          const SizedBox(height: LawHeatmapSpace.xs),
          Text(
            'Wie das System bewertet, woran es sich messen lässt.',
            style: t.bodyLarge?.copyWith(color: LawHeatmapColors.mute),
          ),
          const SizedBox(height: LawHeatmapSpace.lg),
          LawHeatmapCard(
            accent: true,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text('Drei nicht verhandelbare Sätze',
                    style: t.headlineSmall),
                const SizedBox(height: LawHeatmapSpace.md),
                Text(
                  '1. Wir bewerten Pflichten, nicht Gesetze.\n'
                  '2. Jede Zahl trägt die Tier-Stufe ihres schwächsten '
                  'Bestandteils. Kein figürlich-runder Wert ohne Quelle.\n'
                  '3. Kein Output verlässt das System ohne Juristen-Gate '
                  '(`system.approval@^0`).',
                  style: t.bodyLarge?.copyWith(height: 1.7),
                ),
              ],
            ),
          ),
          const SizedBox(height: LawHeatmapSpace.lg),
          LawHeatmapCard(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text('Methodische Vorbilder', style: t.headlineSmall),
                const SizedBox(height: LawHeatmapSpace.sm),
                _bullet(t,
                    'Standardkostenmodell (SKM) — Nationaler Normenkontrollrat. P × F × T × h.'),
                _bullet(t,
                    'Coupette / Katz / Bommarito 2021 — Netzwerkanalyse deutsches Bundesrecht (Graph-Schema).'),
                _bullet(t,
                    'Mercatus QuantGov / RegData — NLP-basierte Pflicht-Klassifikation (must/shall/may).'),
                _bullet(t,
                    'EU Better Regulation Toolbox + REFIT — Cost-Benefit + Evaluations-Methodik.'),
                _bullet(t,
                    'Akoma Ntoso 1.0 (OASIS) + LegalRuleML — XML-Format und Deontik-Datenmodell.'),
                _bullet(t,
                    'UK Better Regulation Framework — Regulatory Policy Committee als unabhängige Letzt-Validierung.'),
              ],
            ),
          ),
          const SizedBox(height: LawHeatmapSpace.lg),
          LawHeatmapCard(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text('4-Tier-Evidenz-Modell', style: t.headlineSmall),
                const SizedBox(height: LawHeatmapSpace.sm),
                _bullet(t,
                    'T1 — amtlich/peer-reviewed: NKR, DESTATIS, ifo, ZEW, BMWK, SVR, IfM Bonn.'),
                _bullet(t,
                    'T2 — Verbands-Erhebung: DIHK, IHK Berlin, ZDH, BDI Mittelstand, BVMW, HDE.'),
                _bullet(t,
                    'T3 — eigene strukturierte Erhebung (Phase 2/3, DSGVO-anonymisiert).'),
                _bullet(t,
                    'T4 — qualitatives Signal: Petitionen, openPetition, mein.berlin.de, Foren — nur Pain-Indikator.'),
              ],
            ),
          ),
          const SizedBox(height: LawHeatmapSpace.lg),
          LawHeatmapCard(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text('Plattform', style: t.headlineSmall),
                const SizedBox(height: LawHeatmapSpace.sm),
                Text(
                  'Ch∆In v0.16.0 — Vendor: F∆I = Flemming.AI. '
                  'Hub. Module. Flow. Deterministisch, WASM-sandboxed, '
                  'tamper-evident Audit-Log (CHAIN-EVENT-V3), '
                  'Apache 2.0, CRA-ready.',
                  style: t.bodyLarge?.copyWith(height: 1.6),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _bullet(TextTheme t, String text) {
    return Padding(
      padding: const EdgeInsets.only(bottom: LawHeatmapSpace.sm),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.only(top: 6, right: 10),
            child: Container(
              width: 5,
              height: 5,
              decoration: const BoxDecoration(
                color: LawHeatmapColors.signal,
                shape: BoxShape.circle,
              ),
            ),
          ),
          Expanded(
            child: Text(text, style: t.bodyLarge?.copyWith(height: 1.6)),
          ),
        ],
      ),
    );
  }
}