/* ── Design tokens ─────────────────────────────────────────────────────────── */
:root {
  --color-background:      #F8FAFC;
  --color-background-alt:  #F1F5F9;
  --color-background-card: #FFFFFF;
  --color-text-primary:    #0F172A;
  --color-text-secondary:  #475569;
  --color-text-muted:      #64748B;
  --color-accent-primary:  #4F46E5;
  --color-accent-hover:    #4338CA;
  --color-accent-light:    #EEF2FF;
  --color-border:          #E2E8F0;
  --color-success:         #00AA44;
  --color-error:           #EF4444;

  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
                  'Helvetica Neue', Arial, sans-serif;

  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .10),
               0 2px 4px -1px rgba(0, 0, 0, .06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .10),
               0 4px 6px -2px rgba(0, 0, 0, .05);
}

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

/* ── Base ──────────────────────────────────────────────────────────────────── */
body {
  background-color: var(--color-background);
  font-family: var(--font-primary);
  color: var(--color-text-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Layout ────────────────────────────────────────────────────────────────── */
.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── Topbar ────────────────────────────────────────────────────────────────── */
.app-topbar {
  background: #ffffff;
  border-bottom: 1px solid var(--color-border);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: 1.1rem;
  transition: opacity 0.15s;
}

.logo:hover {
  opacity: 0.8;
}

.logo img {
  height: 28px;
  width: auto;
  display: block;
}

/* ── Main content ──────────────────────────────────────────────────────────── */
.main-content {
  flex: 1;
  padding: 40px 24px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

/* ── Card ──────────────────────────────────────────────────────────────────── */
.card {
  background: var(--color-background-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 32px;
  box-shadow: var(--shadow-md);
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-weight: 500;
  font-size: 0.9375rem;
  line-height: 1.4;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: background-color 0.15s, border-color 0.15s, opacity 0.15s,
              box-shadow 0.15s;
  white-space: nowrap;
  user-select: none;
}

.btn--primary {
  background: var(--color-accent-primary);
  color: #ffffff;
}

.btn--primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
}

.btn--primary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.btn--secondary {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.btn--secondary:hover:not(:disabled) {
  border-color: var(--color-text-muted);
  background: var(--color-background-alt);
}

.btn--secondary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.btn--full {
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Form controls ─────────────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}

.input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  color: var(--color-text-primary);
  background: #ffffff;
  transition: border-color 0.15s, box-shadow 0.15s;
  appearance: none;
  -webkit-appearance: none;
}

.input::placeholder {
  color: var(--color-text-muted);
}

.input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.input:disabled {
  background: var(--color-background-alt);
  cursor: not-allowed;
  opacity: 0.7;
}

/* Phone input */
.phone-input-wrap {
  position: relative;
}

.phone-input-wrap .input {
  padding-left: 14px;
}

/* OTP input — large centred digits */
.input--otp {
  text-align: center;
  letter-spacing: 0.5em;
  font-size: 1.75rem;
  font-weight: 600;
  padding: 14px;
  line-height: 1.2;
}

/* ── Feedback messages ─────────────────────────────────────────────────────── */
.error-msg {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: 8px;
  display: none;
}

.error-msg.visible {
  display: block;
}

.success-msg {
  color: var(--color-success);
  font-size: 0.875rem;
  margin-top: 8px;
  display: none;
}

.success-msg.visible {
  display: block;
}

/* ── Auth page layout ──────────────────────────────────────────────────────── */
.auth-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 60px);
  padding: 40px 16px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

.auth-card .card-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 6px;
}

.auth-card .card-sub {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  line-height: 1.5;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
  margin-top: 16px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-primary);
  transition: color 0.15s;
}

.back-link:hover {
  color: var(--color-text-primary);
}

/* ── Dashboard grid ────────────────────────────────────────────────────────── */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 28px;
}

.dashboard-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.dashboard-card-placeholder {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* ── Topbar user info ──────────────────────────────────────────────────────── */
.topbar-user {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.875rem;
}

.topbar-user .phone {
  color: var(--color-text-secondary);
}

.topbar-user .logout-link {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.topbar-user .logout-link:hover {
  color: var(--color-error);
}

/* ── Page headings ─────────────────────────────────────────────────────────── */
.page-title {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.page-sub {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

/* ── Utilities ─────────────────────────────────────────────────────────────── */
.mt-4  { margin-top:  4px;  }
.mt-8  { margin-top:  8px;  }
.mt-16 { margin-top: 16px;  }
.mt-24 { margin-top: 24px;  }
.mt-32 { margin-top: 32px;  }

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .app-topbar {
    padding: 0 16px;
  }

  .main-content {
    padding: 24px 16px;
  }

  .card {
    padding: 24px 20px;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}