*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --green-60: #0FA958;
  --green-70: #0a7a3f;
  --green-10: #e6f7ee;
  --red-60: #DC2626;
  --amber-50: #F59E0B;
  --blue-60: #2563EB;
  --blue-10: #eff6ff;
  --purple-60: #7c3aed;
  --dark: #0F172A;
  --muted: #64748B;
  --surface: #FFFFFF;
  --gray-10: #f8fafc;
  --gray-20: #e2e8f0;
}

body { font-family: 'Segoe UI', system-ui, sans-serif; margin: 0; background: var(--gray-10); color: var(--dark); }

/* ── TOP BAR ── */
.topbar { background: var(--dark); color: white; padding: 0; }
.topbar-inner { max-width: 1200px; margin: 0 auto; padding: 1.25rem 1.5rem; display: flex; align-items: center; gap: 1rem; }
.topbar h1 { font-size: 1.2rem; font-weight: 800; letter-spacing: 0.02em; }
.topbar p { font-size: 0.78rem; color: rgba(255,255,255,0.6); margin-top: 0.25rem; }
.topbar-tag { font-size: 0.65rem; font-weight: 600; background: var(--green-60); color: #fff; padding: 0.15rem 0.6rem; border-radius: 999px; letter-spacing: 0.05em; margin-left: 0.5rem; vertical-align: middle; }
.topbar-chips { display: flex; gap: 0.4rem; margin-left: auto; flex-wrap: wrap; }
.chip { font-size: 0.68rem; font-weight: 600; padding: 0.25rem 0.65rem; border-radius: 999px; }
.chip-green { background: var(--green-60); color: #fff; }
.chip-blue  { background: var(--blue-60);  color: #fff; }
.chip-amber { background: var(--amber-50); color: #fff; }

/* ── TABS ── */
.tabs { display: flex; gap: 0; padding: 0 1.5rem; background: white; border-bottom: 1px solid var(--gray-20); position: sticky; top: 0; z-index: 100; max-width: 100%; overflow-x: auto; }
.tab { padding: 0.85rem 1rem; border: none; border-bottom: 3px solid transparent; background: transparent; cursor: pointer; font-size: 0.82rem; font-weight: 500; color: var(--muted); white-space: nowrap; transition: color 0.15s; margin-bottom: -1px; }
.tab:hover { color: var(--dark); }
.tab.active { border-bottom-color: var(--green-60); color: var(--green-60); font-weight: 700; }

/* ── MAIN ── */
main { max-width: 1200px; margin: 0 auto; padding: 1.5rem; }
.panel { display: none; }
.panel.active { display: block; }

/* ── SECTION HEADER ── */
.section-header { margin-bottom: 1.5rem; }
.section-header h2 { font-size: 1.15rem; font-weight: 800; color: var(--dark); }
.section-sub { font-size: 0.82rem; color: var(--muted); margin-top: 0.35rem; }

/* ── DESIGN GALLERY GRID ── */
.design-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.25rem; margin-bottom: 2.5rem; }

.design-card {
  background: var(--surface); border-radius: 16px; border: 1px solid var(--gray-20);
  overflow: hidden; text-decoration: none; color: inherit; display: flex; flex-direction: column;
  transition: transform 0.15s, box-shadow 0.15s; position: relative;
}
.design-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.12); border-color: var(--green-60); }

.design-card-hero {
  height: 200px; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.hero-passenger { background: linear-gradient(135deg, #0F172A 0%, #0FA958 100%); }
.hero-driver     { background: linear-gradient(135deg, #0F172A 0%, #1e3a5f 100%); }
.hero-admin      { background: linear-gradient(135deg, #1e1b4b 0%, #312e81 60%, #0F172A 100%); }

/* Phone mini mockup */
.phone-mini { width: 90px; background: #1a1a1a; border-radius: 16px; padding: 5px; box-shadow: 0 8px 32px rgba(0,0,0,0.4); }
.phone-mini-screen { background: #fff; border-radius: 12px; overflow: hidden; height: 160px; display: flex; flex-direction: column; }
.phone-mini-status { height: 10px; background: #0F172A; flex-shrink: 0; }
.phone-mini-content { flex: 1; padding: 6px; display: flex; flex-direction: column; gap: 4px; }
.mock-bar { background: var(--green-60); border-radius: 3px; height: 6px; }
.mock-bar.green { background: var(--green-60); }
.mock-map { flex: 1; background: linear-gradient(135deg, #d1e7dd, #b8d9c8); border-radius: 4px; min-height: 40px; }
.mock-chips { display: flex; gap: 3px; }
.mock-chip { font-size: 6px; padding: 2px 5px; border-radius: 999px; border: 1px solid #e2e8f0; background: #fff; white-space: nowrap; }
.mock-chip.green { background: var(--green-10); border-color: var(--green-60); color: var(--green-60); }
.mock-btn { font-size: 7px; font-weight: 700; padding: 4px 8px; border-radius: 6px; text-align: center; }
.mock-btn.green { background: var(--green-60); color: #fff; }
.earnings-mini { background: rgba(15,169,88,0.15); border-radius: 6px; padding: 5px; }

/* Desktop mini mockup */
.desktop-mini { width: 220px; background: #1a1a1a; border-radius: 8px; overflow: hidden; box-shadow: 0 8px 32px rgba(0,0,0,0.4); }
.desktop-mini-bar { height: 16px; background: #2d2d2d; display: flex; align-items: center; padding: 0 8px; gap: 5px; }
.desktop-dot { width: 6px; height: 6px; border-radius: 50%; }
.desktop-dot.red   { background: #ff5f57; }
.desktop-dot.amber { background: #febc2e; }
.desktop-dot.green { background: #28c840; }
.desktop-mini-body { display: flex; height: 130px; }
.desktop-sidebar { width: 60px; background: #0F172A; padding: 6px 4px; display: flex; flex-direction: column; gap: 2px; }
.ds-item { font-size: 5.5px; color: rgba(255,255,255,0.5); padding: 3px 4px; border-radius: 3px; white-space: nowrap; overflow: hidden; }
.active-item { background: rgba(15,169,88,0.2); color: var(--green-60); }
.desktop-content { flex: 1; background: #f8fafc; padding: 5px; display: flex; flex-direction: column; gap: 4px; }
.dc-kpi-row { display: flex; gap: 3px; }
.dc-kpi { flex: 1; background: #fff; border-radius: 3px; padding: 3px; border: 1px solid #e2e8f0; border-top: 2px solid #e2e8f0; }
.dc-kpi-v { font-size: 9px; font-weight: 800; color: var(--dark); }
.dc-kpi-v.green { color: var(--green-60); }
.dc-kpi-v.red   { color: var(--red-60); }
.dc-kpi-l { font-size: 5px; color: #94a3b8; }
.dc-map { flex: 1; background: linear-gradient(135deg, #d1e7dd, #b8d9c8); border-radius: 3px; }

.design-card-body { padding: 1.25rem; flex: 1; }
.design-card-badge { display: inline-block; font-size: 0.62rem; font-weight: 700; padding: 0.2rem 0.6rem; border-radius: 4px; margin-bottom: 0.5rem; }
.badge-green  { background: var(--green-10);                color: var(--green-60); }
.badge-blue   { background: #eff6ff;                        color: var(--blue-60); }
.badge-purple { background: #f5f3ff;                        color: var(--purple-60); }
.design-card-title { font-size: 1rem; font-weight: 800; color: var(--dark); margin-bottom: 0.4rem; }
.design-card-desc { font-size: 0.78rem; color: var(--muted); line-height: 1.6; margin-bottom: 0.75rem; }
.design-card-meta { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.meta-pill { font-size: 0.65rem; padding: 0.2rem 0.55rem; border-radius: 6px; background: var(--gray-10); border: 1px solid var(--gray-20); color: var(--dark); }
.design-card-arrow { position: absolute; top: 1rem; right: 1rem; font-size: 1.2rem; color: rgba(255,255,255,0.6); transition: transform 0.15s; }
.design-card:hover .design-card-arrow { transform: translateX(4px); }

/* ── UX PRINCIPLES ── */
.design-principles { margin-top: 0.5rem; }
.design-principles h3 { font-size: 0.9rem; font-weight: 700; color: var(--dark); margin-bottom: 1rem; }
.principles-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0.75rem; }
.principle-card { background: var(--surface); border-radius: 10px; border: 1px solid var(--gray-20); padding: 0.85rem; }
.principle-icon { font-size: 1.3rem; margin-bottom: 0.35rem; }
.principle-title { font-size: 0.8rem; font-weight: 700; color: var(--dark); margin-bottom: 0.2rem; }
.principle-desc { font-size: 0.72rem; color: var(--muted); line-height: 1.5; }

/* ── OVERVIEW / ARCH ── */
#overview h2, #roadmap h2, #issues h2 { font-size: 1.15rem; font-weight: 800; margin-bottom: 1rem; }
#overview p, #overview ul { font-size: 0.85rem; color: var(--muted); margin-bottom: 0.75rem; }
#overview ul { padding-left: 1.25rem; }
#overview li { margin-bottom: 0.35rem; line-height: 1.5; }
.diagram { background: #111827; color: #e5e7eb; padding: 1rem 1.25rem; border-radius: 10px; overflow-x: auto; font-size: 0.72rem; line-height: 1.7; margin-top: 1rem; }

/* Architecture cards */
.arch-section { margin-bottom: 2rem; }
.arch-section-title { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--gray-20); }
.arch-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 0.75rem; }
.arch-card { background: var(--surface); border-radius: 12px; border: 1px solid var(--gray-20); padding: 1rem; border-left: 3px solid var(--gray-20); }
.arch-card.green  { border-left-color: var(--green-60); }
.arch-card.blue   { border-left-color: var(--blue-60); }
.arch-card.purple { border-left-color: var(--purple-60); }
.arch-card.amber  { border-left-color: var(--amber-50); }
.arch-card.red    { border-left-color: var(--red-60); }
.arch-card-icon   { font-size: 1.2rem; margin-bottom: 0.35rem; }
.arch-card-title  { font-size: 0.85rem; font-weight: 700; color: var(--dark); margin-bottom: 0.2rem; }
.arch-card-sub    { font-size: 0.68rem; color: var(--muted); margin-bottom: 0.5rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; }
.arch-card-desc   { font-size: 0.75rem; color: var(--muted); line-height: 1.55; margin-bottom: 0.5rem; }
.arch-pill-row    { display: flex; gap: 0.3rem; flex-wrap: wrap; }
.arch-pill { font-size: 0.62rem; padding: 0.15rem 0.5rem; border-radius: 4px; background: var(--gray-10); border: 1px solid var(--gray-20); color: var(--dark); }
.arch-card-list { list-style: none; margin-top: 0.35rem; }
.arch-card-list li { font-size: 0.72rem; color: var(--muted); padding-left: 1rem; position: relative; line-height: 1.5; margin-bottom: 0.15rem; }
.arch-card-list li::before { content: '→'; position: absolute; left: 0; color: var(--green-60); font-weight: 700; font-size: 0.65rem; }

/* DB schema mini table */
.db-schema-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 0.75rem; margin-top: 0.5rem; }
.db-table-card { background: var(--surface); border: 1px solid var(--gray-20); border-radius: 10px; overflow: hidden; }
.db-table-header { background: var(--dark); color: #fff; padding: 0.45rem 0.75rem; font-size: 0.75rem; font-weight: 700; display: flex; align-items: center; gap: 0.4rem; }
.db-table-header span { font-size: 0.62rem; background: rgba(255,255,255,0.15); padding: 0.1rem 0.4rem; border-radius: 3px; }
.db-field { display: flex; align-items: baseline; gap: 0.4rem; padding: 0.3rem 0.75rem; border-bottom: 1px solid var(--gray-10); font-size: 0.7rem; }
.db-field:last-child { border-bottom: none; }
.db-field-name { font-weight: 600; color: var(--dark); min-width: 110px; }
.db-field-type { color: var(--blue-60); font-size: 0.65rem; font-family: monospace; }
.db-field-note { color: var(--muted); font-size: 0.65rem; margin-left: auto; }
.db-pk { background: var(--green-10); color: var(--green-60); font-size: 0.55rem; font-weight: 700; padding: 0.05rem 0.3rem; border-radius: 3px; }
.db-fk { background: var(--blue-10); color: var(--blue-60); font-size: 0.55rem; font-weight: 700; padding: 0.05rem 0.3rem; border-radius: 3px; }

/* ── ROADMAP ── */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.75rem; margin-bottom: 1rem; }
.card { background: var(--surface); border: 1px solid var(--gray-20); border-radius: 12px; padding: 1rem; border-top: 3px solid var(--gray-20); }
.card-p0 { border-top-color: var(--green-60); }
.card h3 { font-size: 0.9rem; font-weight: 700; margin-bottom: 0.35rem; }
.card p { font-size: 0.78rem; color: var(--muted); line-height: 1.5; margin-bottom: 0.5rem; }
.sprint-badge { font-size: 0.6rem; font-weight: 700; padding: 0.15rem 0.5rem; border-radius: 4px; background: var(--green-10); color: var(--green-60); }

/* ── ISSUES TABLE ── */
table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: 10px; overflow: hidden; border: 1px solid var(--gray-20); }
th { background: var(--gray-10); padding: 0.6rem 0.85rem; text-align: left; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 700; border-bottom: 1px solid var(--gray-20); }
td { padding: 0.55rem 0.85rem; border-bottom: 1px solid var(--gray-10); font-size: 0.78rem; }
tbody tr:hover { background: var(--gray-10); }
.type-badge { padding: 0.1rem 0.4rem; border-radius: 4px; font-size: 0.6rem; font-weight: 700; }
.type-badge.backend  { background: #eff6ff; color: var(--blue-60); }
.type-badge.security { background: #fee2e2; color: var(--red-60); }
.type-badge.mobile   { background: #f5f3ff; color: var(--purple-60); }
.type-badge.ai       { background: #fef3c7; color: #92400e; }
.type-badge.admin    { background: var(--green-10); color: var(--green-60); }
.prio-badge { padding: 0.1rem 0.4rem; border-radius: 4px; font-size: 0.6rem; font-weight: 800; }
.prio-badge.p0 { background: var(--green-10); color: var(--green-60); }

@media (max-width: 700px) {
  .design-grid { grid-template-columns: 1fr; }
  .topbar-chips { display: none; }
  .principles-grid { grid-template-columns: 1fr 1fr; }
}