/* =====================================================================
   Shop Rental Management System — Design System
   A single source of truth for tokens + reusable components.
   No external font/CDN dependency — must work on offline shared hosting.
   ===================================================================== */

:root {
  /* ---- Brand palette: deep navy + teal accent, fintech-grade ---- */
  --color-navy-900: #0a1c30;
  --color-navy-800: #0f2740;
  --color-navy-700: #15334f;
  --color-navy-600: #1c4262;
  --color-navy-500: #275277;

  --color-teal-600: #0b7285;
  --color-teal-500: #0e8a9e;
  --color-teal-400: #2ba3b5;
  --color-teal-100: #e3f4f6;

  --color-gold-500: #b8894a;
  --color-gold-100: #f7ecdd;

  /* ---- Neutrals ---- */
  --color-ink-900: #10161f;
  --color-ink-700: #34404f;
  --color-ink-500: #5b6b7c;
  --color-ink-300: #9aa8b6;
  --color-ink-100: #e4e9ee;
  --color-ink-50: #f4f6f8;
  --color-white: #ffffff;

  /* ---- Semantic status ---- */
  --color-success-600: #187a4a;
  --color-success-100: #e2f6ea;
  --color-warning-600: #a9660b;
  --color-warning-100: #fdf1de;
  --color-danger-600: #b3261e;
  --color-danger-100: #fbe6e4;
  --color-info-600: #1d5fa3;
  --color-info-100: #e5f0fb;

  /* ---- Surfaces (light theme, default for this app) ---- */
  --surface-page: #f3f5f8;
  --surface-card: var(--color-white);
  --surface-sunken: var(--color-ink-50);
  --border-subtle: var(--color-ink-100);
  --text-primary: var(--color-ink-900);
  --text-secondary: var(--color-ink-500);
  --text-inverse: var(--color-white);

  /* ---- Typography ---- */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --fs-xs: 0.75rem;
  --fs-sm: 0.8125rem;
  --fs-base: 0.9375rem;
  --fs-md: 1.0625rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.625rem;
  --fs-2xl: 2rem;

  /* ---- Spacing scale (4px base) ---- */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;

  /* ---- Radius / shadow ---- */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(16, 22, 31, 0.06);
  --shadow-md: 0 4px 16px rgba(16, 22, 31, 0.08);
  --shadow-lg: 0 12px 32px rgba(16, 22, 31, 0.12);

  --sidebar-width: 260px;
  --topbar-height: 64px;
}

/* ---------------------------------------------------------------------
   Reset + base
   --------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  color: var(--text-primary);
  background: var(--surface-page);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5, h6 { margin: 0 0 var(--sp-2); font-weight: 650; letter-spacing: -0.01em; color: var(--text-primary); }
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
p { margin: 0 0 var(--sp-3); color: var(--text-secondary); }
a { color: var(--color-teal-600); text-decoration: none; }
a:hover { text-decoration: underline; }
small { font-size: var(--fs-xs); }
::selection { background: var(--color-teal-100); }

/* ---------------------------------------------------------------------
   Layout primitives
   --------------------------------------------------------------------- */
.container { max-width: 1180px; margin: 0 auto; padding: 0 var(--sp-6); }
.stack { display: flex; flex-direction: column; gap: var(--sp-4); }
.row { display: flex; align-items: center; gap: var(--sp-3); }
.spread { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); }
.grid { display: grid; gap: var(--sp-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }
/* Inside the app shell, the fixed sidebar eats into available width, so
   grids there need to collapse earlier than the bare page-level ones. */
@media (max-width: 1180px) { .content-area .grid-2, .content-area .grid-3 { grid-template-columns: 1fr; } }
@media (max-width: 1400px) { .content-area .grid-4 { grid-template-columns: repeat(2, 1fr); } }

/* ---------------------------------------------------------------------
   Card
   --------------------------------------------------------------------- */
.card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--sp-6);
}
.card-tight { padding: var(--sp-4); }
.card-title { font-size: var(--fs-md); font-weight: 650; margin-bottom: var(--sp-1); }
.card-subtitle { color: var(--text-secondary); font-size: var(--fs-sm); margin-bottom: var(--sp-4); }

/* ---------------------------------------------------------------------
   Buttons
   --------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: 600;
  padding: 0.65rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
  text-decoration: none;
  line-height: 1.2;
}
.btn:active { transform: translateY(1px); }
.btn-block { width: 100%; }
.btn-primary { background: var(--color-navy-800); color: var(--text-inverse); }
.btn-primary:hover { background: var(--color-navy-700); text-decoration: none; }
.btn-accent { background: var(--color-teal-600); color: var(--text-inverse); }
.btn-accent:hover { background: var(--color-teal-500); text-decoration: none; }
.btn-outline { background: transparent; border-color: var(--border-subtle); color: var(--text-primary); }
.btn-outline:hover { border-color: var(--color-ink-300); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--surface-sunken); text-decoration: none; }
.btn-danger { background: var(--color-danger-600); color: var(--text-inverse); }
.btn-danger:hover { background: #942019; text-decoration: none; }
.btn-sm { padding: 0.4rem 0.75rem; font-size: var(--fs-xs); }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* ---------------------------------------------------------------------
   Forms
   --------------------------------------------------------------------- */
.field { margin-bottom: var(--sp-4); }
.field label {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: var(--sp-2);
}
.field-hint { font-size: var(--fs-xs); color: var(--text-secondary); margin-top: var(--sp-1); }
input[type="text"], input[type="email"], input[type="password"], input[type="tel"],
input[type="number"], input[type="date"], textarea, select {
  width: 100%;
  font-family: inherit;
  font-size: var(--fs-base);
  color: var(--text-primary);
  background: var(--surface-card);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-teal-500);
  box-shadow: 0 0 0 3px var(--color-teal-100);
}
.field.has-error input, .field.has-error textarea, .field.has-error select {
  border-color: var(--color-danger-600);
}
.field-error { color: var(--color-danger-600); font-size: var(--fs-xs); margin-top: var(--sp-1); font-weight: 600; }
.input-group { display: flex; align-items: center; gap: var(--sp-2); }
.checkbox-row { display: flex; align-items: center; gap: var(--sp-2); font-size: var(--fs-sm); color: var(--text-secondary); }

/* ---------------------------------------------------------------------
   Badges / status pills
   --------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  font-size: var(--fs-xs);
  font-weight: 650;
  padding: 0.28em 0.75em;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.badge-success { background: var(--color-success-100); color: var(--color-success-600); }
.badge-warning { background: var(--color-warning-100); color: var(--color-warning-600); }
.badge-danger  { background: var(--color-danger-100); color: var(--color-danger-600); }
.badge-info    { background: var(--color-info-100); color: var(--color-info-600); }
.badge-neutral { background: var(--color-ink-100); color: var(--text-secondary); }
.badge-gold    { background: var(--color-gold-100); color: #7a5424; }

/* ---------------------------------------------------------------------
   Alerts / flash messages / toasts
   --------------------------------------------------------------------- */
.alert {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  border: 1px solid transparent;
  margin-bottom: var(--sp-4);
}
.alert-success { background: var(--color-success-100); color: #10552f; border-color: #bfe6cd; }
.alert-danger  { background: var(--color-danger-100); color: #7d1a14; border-color: #f3c6c2; }
.alert-info    { background: var(--color-info-100); color: #133d6b; border-color: #bcd8f3; }
.alert-warning { background: var(--color-warning-100); color: #6f4507; border-color: #f0d6a6; }

/* ---------------------------------------------------------------------
   Tabs
   --------------------------------------------------------------------- */
.tabs { display: flex; gap: var(--sp-1); background: var(--surface-sunken); padding: 4px; border-radius: var(--radius-md); }
.tab-btn {
  flex: 1;
  text-align: center;
  padding: 0.6rem 1rem;
  font-size: var(--fs-sm);
  font-weight: 650;
  color: var(--text-secondary);
  border-radius: calc(var(--radius-md) - 3px);
  cursor: pointer;
  border: none;
  background: transparent;
  font-family: inherit;
}
.tab-btn.active { background: var(--surface-card); color: var(--text-primary); box-shadow: var(--shadow-sm); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------------------------------------------------------------------
   Tables
   --------------------------------------------------------------------- */
table { width: 100%; border-collapse: collapse; font-size: var(--fs-sm); }
thead th {
  text-align: left;
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  padding: var(--sp-3) var(--sp-3);
  border-bottom: 1.5px solid var(--border-subtle);
}
tbody td { padding: var(--sp-3); border-bottom: 1px solid var(--border-subtle); color: var(--text-primary); }
tbody tr:hover { background: var(--surface-sunken); }
.table-wrap { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--border-subtle); background: var(--surface-card); }
.table-wrap table { margin: 0; }
.table-wrap thead th:first-child, .table-wrap tbody td:first-child { padding-left: var(--sp-5); }

/* ---------------------------------------------------------------------
   Empty / loading states
   --------------------------------------------------------------------- */
.empty-state { text-align: center; padding: var(--sp-12) var(--sp-6); color: var(--text-secondary); }
.empty-state .empty-icon { font-size: 2.5rem; margin-bottom: var(--sp-3); opacity: 0.6; }

/* ---------------------------------------------------------------------
   Auth split-screen layout
   --------------------------------------------------------------------- */
.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
}
@media (max-width: 900px) { .auth-shell { grid-template-columns: 1fr; } }
.auth-brand {
  background: radial-gradient(circle at 20% 20%, var(--color-navy-600), var(--color-navy-900) 70%);
  color: var(--text-inverse);
  padding: var(--sp-12) var(--sp-10);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
@media (max-width: 900px) { .auth-brand { padding: var(--sp-8) var(--sp-6); } }
.auth-brand::after {
  content: "";
  position: absolute;
  right: -80px; bottom: -80px;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: rgba(43, 163, 181, 0.18);
}
.auth-brand-mark { display: flex; align-items: center; gap: var(--sp-3); font-weight: 700; font-size: var(--fs-md); z-index: 1; }
.auth-brand-logo {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: var(--color-teal-500);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.1rem;
}
.auth-brand-copy { z-index: 1; max-width: 420px; }
.auth-brand-copy h1 { color: var(--text-inverse); font-size: var(--fs-2xl); margin-bottom: var(--sp-3); }
.auth-brand-copy p { color: rgba(255,255,255,0.75); font-size: var(--fs-base); }
.auth-brand-features { list-style: none; padding: 0; margin: var(--sp-6) 0 0; display: flex; flex-direction: column; gap: var(--sp-3); z-index: 1; }
.auth-brand-features li { display: flex; gap: var(--sp-3); align-items: flex-start; color: rgba(255,255,255,0.85); font-size: var(--fs-sm); }
.auth-brand-features .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-teal-400); margin-top: 6px; flex-shrink: 0; }
.auth-brand-footer { z-index: 1; color: rgba(255,255,255,0.5); font-size: var(--fs-xs); }

.auth-panel { display: flex; align-items: center; justify-content: center; padding: var(--sp-8); }
.auth-panel-inner { width: 100%; max-width: 420px; }
.auth-panel-inner h2 { margin-bottom: var(--sp-1); }
.auth-panel-inner .lede { margin-bottom: var(--sp-6); }

/* ---------------------------------------------------------------------
   App shell (admin / tenant): sidebar + topbar
   --------------------------------------------------------------------- */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-navy-900);
  color: rgba(255,255,255,0.85);
  display: flex;
  flex-direction: column;
  padding: var(--sp-5) var(--sp-3);
}
.sidebar-brand { display: flex; align-items: center; gap: var(--sp-2); padding: 0 var(--sp-2); margin-bottom: var(--sp-6); color: var(--text-inverse); font-weight: 700; }
.sidebar-nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.sidebar-nav a {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: 0.6rem var(--sp-3);
  border-radius: var(--radius-md);
  color: rgba(255,255,255,0.65);
  font-size: var(--fs-sm);
  font-weight: 550;
  text-decoration: none;
}
.sidebar-nav a:hover { background: rgba(255,255,255,0.06); color: var(--text-inverse); }
.sidebar-nav a.active { background: var(--color-teal-600); color: var(--text-inverse); }
.sidebar-section-label { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.08em; color: rgba(255,255,255,0.35); padding: var(--sp-4) var(--sp-3) var(--sp-1); }
.sidebar-footer { border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--sp-4); margin-top: var(--sp-3); }

.main-area { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  height: var(--topbar-height);
  flex-shrink: 0;
  background: var(--surface-card);
  border-bottom: 1px solid var(--border-subtle);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--sp-6);
}
.topbar-title { font-weight: 650; font-size: var(--fs-md); }
.content-area { padding: var(--sp-6); flex: 1; }

.avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--color-teal-600); color: var(--text-inverse);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: var(--fs-sm);
}

/* Mobile-first tenant portal helpers */
@media (max-width: 780px) {
  .sidebar { display: none; }
  .content-area { padding: var(--sp-4); }
}