/* ==========================================================================
   NTT Global Bot — custom design system (no Bootstrap, no framework)
   Light + dark theme via CSS custom properties. Hand-written.
   ========================================================================== */

/* ---- Design tokens -------------------------------------------------------- */
:root {
  /* Brand */
  --brand-500: #6366f1;
  --brand-600: #4f46e5;
  --brand-700: #4338ca;
  --accent-500: #14b8a6;

  /* Radius / spacing / typography */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-8: 48px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Noto Sans", "Noto Sans Bengali", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.14);
  --ring: 0 0 0 3px color-mix(in srgb, var(--brand-500) 35%, transparent);
  --transition: 160ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Semantic status */
  --ok: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --info: var(--brand-600);
}

/* Light theme (default) */
:root,
:root[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-elevated: #ffffff;
  --surface: #ffffff;
  --surface-2: #f1f3f9;
  --border: #e3e6ef;
  --border-strong: #cdd3e2;
  --text: #1a1f36;
  --text-muted: #616a86;
  --text-faint: #8b93a9;
  --topbar-bg: rgba(255, 255, 255, 0.82);
  --shadow-color: rgba(15, 23, 42, 0.1);
}

/* Dark theme */
:root[data-theme="dark"] {
  --bg: #0c0f1a;
  --bg-elevated: #141a2b;
  --surface: #151b2d;
  --surface-2: #1c2338;
  --border: #262e45;
  --border-strong: #38425f;
  --text: #eef1f8;
  --text-muted: #9aa4bf;
  --text-faint: #6b748f;
  --topbar-bg: rgba(15, 20, 34, 0.82);
  --shadow-color: rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.55);
}

/* ---- Reset / base --------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  background-image: radial-gradient(
      1200px 600px at 100% -10%,
      color-mix(in srgb, var(--brand-500) 10%, transparent),
      transparent 60%
    ),
    radial-gradient(900px 500px at -10% 0%, color-mix(in srgb, var(--accent-500) 8%, transparent), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--transition), color var(--transition);
}

h1, h2, h3, h4 {
  line-height: 1.25;
  margin: 0 0 var(--space-3);
  font-weight: 650;
  letter-spacing: -0.01em;
}

h1 { font-size: 1.9rem; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; }

p { margin: 0 0 var(--space-4); }

a {
  color: var(--brand-600);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--brand-700); }

:root[data-theme="dark"] a { color: color-mix(in srgb, var(--brand-500) 80%, white); }

code, pre { font-family: var(--font-mono); }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-5) 0;
}

:focus-visible {
  outline: none;
  box-shadow: var(--ring);
  border-radius: var(--radius-sm);
}

/* ---- Layout --------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-5) var(--space-8);
}

.stack > * + * { margin-top: var(--space-4); }

.grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

/* ---- Topbar / nav --------------------------------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--topbar-bg);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--border);
}

.topbar__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-5);
  height: 60px;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.brand:hover { color: var(--text); }
.brand__logo {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand-500), var(--accent-500));
  box-shadow: var(--shadow-sm);
  font-size: 15px;
}

.mainnav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
}
.mainnav__spacer { flex: 1; }
.mainnav__link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 550;
  transition: color var(--transition), background-color var(--transition);
}
.mainnav__link:hover {
  color: var(--text);
  background: var(--surface-2);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  margin-left: auto;
  padding: 0 9px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle span {
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: var(--transition);
}

/* ---- Theme toggle --------------------------------------------------------- */
.theme-toggle {
  position: relative;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 50%;
  cursor: pointer;
  color: var(--text);
  transition: var(--transition);
}
.theme-toggle:hover { border-color: var(--border-strong); background: var(--surface-2); }
.theme-toggle__icon { position: absolute; font-size: 17px; transition: opacity var(--transition), transform var(--transition); }
:root[data-theme="light"] .theme-toggle__icon--moon,
:root[data-theme="dark"] .theme-toggle__icon--sun { opacity: 0; transform: scale(0.4) rotate(-90deg); }
:root[data-theme="light"] .theme-toggle__icon--sun,
:root[data-theme="dark"] .theme-toggle__icon--moon { opacity: 1; transform: scale(1) rotate(0); }

/* ---- Buttons -------------------------------------------------------------- */
.btn,
button[type="submit"],
input[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 18px;
  font: inherit;
  font-weight: 600;
  line-height: 1;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn:hover { border-color: var(--text-faint); color: var(--text); }
.btn--primary,
button[type="submit"],
input[type="submit"] {
  color: #fff;
  background: linear-gradient(135deg, var(--brand-500), var(--brand-600));
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover,
button[type="submit"]:hover,
input[type="submit"]:hover {
  color: #fff;
  filter: brightness(1.06);
  box-shadow: var(--shadow-md);
}
.btn--ghost { background: transparent; border-color: var(--border); color: var(--text-muted); }
.btn--ghost:hover { background: var(--surface-2); color: var(--text); }
.btn--danger { color: #fff; background: var(--danger); border-color: transparent; }
.btn--sm { padding: 7px 13px; font-size: 0.85rem; }
.btn--lg { padding: 13px 24px; font-size: 1.02rem; }
.btn--block { width: 100%; }
.btn[disabled], button[disabled] { opacity: 0.55; cursor: not-allowed; }

/* ---- Cards ---------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.card-body,
.card__body { padding: var(--space-5); }
.card__header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
  font-weight: 650;
}
.card--pad { padding: var(--space-5); }

/* ---- Forms ---------------------------------------------------------------- */
label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: var(--space-2); color: var(--text); }

input:not([type="checkbox"]):not([type="radio"]):not([type="submit"]):not([type="button"]),
select,
textarea,
.form-control {
  width: 100%;
  padding: 10px 13px;
  font: inherit;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
input::placeholder, textarea::placeholder { color: var(--text-faint); }
input:focus, select:focus, textarea:focus, .form-control:focus {
  outline: none;
  border-color: var(--brand-500);
  box-shadow: var(--ring);
}
textarea { min-height: 120px; resize: vertical; }

/* allauth / Django form rows render as <p> or field wrappers */
form p { margin-bottom: var(--space-4); }
.helptext, .form-text { display: block; margin-top: var(--space-1); font-size: 0.82rem; color: var(--text-muted); }
.errorlist, .invalid-feedback {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
  color: var(--danger);
  font-size: 0.85rem;
}
.field-row { margin-bottom: var(--space-4); }
.checkbox, .form-check { display: flex; align-items: center; gap: var(--space-2); }
.checkbox label, .form-check label { margin-bottom: 0; font-weight: 500; }

/* ---- Alerts / messages ---------------------------------------------------- */
.messages { margin-bottom: var(--space-5); display: grid; gap: var(--space-3); }
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}
.alert__text { flex: 1; }
.alert__close {
  border: none;
  background: transparent;
  color: var(--text-faint);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 var(--space-1);
}
.alert__close:hover { color: var(--text); }
.alert--success, .alert--ok { border-left-color: var(--ok); }
.alert--info { border-left-color: var(--info); }
.alert--warning, .alert--warn { border-left-color: var(--warn); }
.alert--error, .alert--danger { border-left-color: var(--danger); }

/* ---- Tables --------------------------------------------------------------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table.table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.table th, .table td { padding: var(--space-3) var(--space-4); text-align: left; border-bottom: 1px solid var(--border); }
.table thead th { background: var(--surface-2); color: var(--text-muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.table tbody tr:hover { background: var(--surface-2); }
.table tbody tr:last-child td { border-bottom: none; }

/* ---- Badges / pills ------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.badge--ok { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); background: color-mix(in srgb, var(--ok) 12%, transparent); }
.badge--danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, transparent); background: color-mix(in srgb, var(--danger) 12%, transparent); }
.badge--brand { color: var(--brand-600); border-color: color-mix(in srgb, var(--brand-500) 40%, transparent); background: color-mix(in srgb, var(--brand-500) 12%, transparent); }

/* ---- Utilities ------------------------------------------------------------ */
.muted { color: var(--text-muted); }
.text-center { text-align: center; }
.flex { display: flex; align-items: center; gap: var(--space-3); }
.flex--between { justify-content: space-between; }
.flex--wrap { flex-wrap: wrap; }
.mt-0 { margin-top: 0; }
.page-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-6); }
.page-head p { margin: var(--space-1) 0 0; }

/* Auth (entrance) layout */
.auth-shell { min-height: calc(100vh - 60px); display: grid; place-items: center; padding: var(--space-6) var(--space-4); }
.auth-card { width: 100%; max-width: 420px; }
.auth-card h1 { text-align: center; }

/* Empty state */
.empty {
  text-align: center;
  padding: var(--space-8) var(--space-5);
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  background: color-mix(in srgb, var(--surface) 60%, transparent);
}
.empty__icon { font-size: 2.4rem; margin-bottom: var(--space-3); }

/* Hero (landing) */
.hero { padding: var(--space-8) 0 var(--space-6); }
.hero h1 { font-size: clamp(2rem, 4vw, 3rem); background: linear-gradient(135deg, var(--brand-600), var(--accent-500)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__lead { font-size: 1.15rem; color: var(--text-muted); max-width: 60ch; }

/* ---- Responsive ----------------------------------------------------------- */
@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .mainnav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    padding: var(--space-4);
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    display: none;
  }
  .mainnav.is-open { display: flex; }
  .mainnav__spacer { display: none; }
  .theme-toggle { align-self: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}