/* ============================================================
   auth.css — Authentication pages: signup, verify, login
   INDIS 2026 Conference Registration System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Archivo:wght@700;800&display=swap');

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

:root {
  --navy:      #1E3A5F;
  --navy-dk:   #142843;
  --navy-lt:   #2a4f7e;
  --orange:    #D85A30;
  --orange-lt: #e8703a;
  --blue-lt:   #B5D4F4;
  --white:     #ffffff;
  --g50:       #f8fafc;
  --g100:      #f1f5f9;
  --g200:      #e2e8f0;
  --g300:      #cbd5e1;
  --g400:      #94a3b8;
  --g600:      #475569;
  --g900:      #0f172a;
  --error:     #ef4444;
  --success:   #22c55e;
  --radius:    14px;
  --shadow:    0 30px 70px rgba(0,0,0,0.40), 0 8px 28px rgba(0,0,0,0.22);
  --ease:      cubic-bezier(0.4, 0, 0.2, 1);
}

html, body {
  min-height: 100vh;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ================================================================
   BACKGROUND
   ================================================================ */
.auth-bg {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  background: linear-gradient(145deg, #0a1624 0%, #1E3A5F 55%, #0f2240 100%);
  position: relative;
  overflow: hidden;
}

/* Glow orbs */
.auth-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 900px 700px at 15% 25%, rgba(181,212,244,0.09) 0%, transparent 65%),
    radial-gradient(ellipse 700px 600px at 85% 75%, rgba(216,90,48,0.08) 0%, transparent 65%);
  pointer-events: none;
}

/* Decorative ring */
.auth-bg::after {
  content: '';
  position: absolute;
  width: 700px; height: 700px;
  border-radius: 50%;
  border: 1px solid rgba(181,212,244,0.06);
  top: -220px; right: -220px;
  pointer-events: none;
}

/* ================================================================
   CARD
   ================================================================ */
.auth-card {
  position: relative;
  width: 100%;
  max-width: 460px;
  background: #fff;
  border-radius: 24px;
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: cardIn 0.5s cubic-bezier(0.16,1,0.3,1) both;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(36px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}

/* ---- Header ---- */
.auth-header {
  background: var(--navy);
  padding: 28px 36px 22px;
  text-align: center;
  position: relative;
}

.auth-header::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--orange) 0%, #f59e0b 50%, var(--orange) 100%);
}

.auth-logo {
  height: 50px;
  display: block;
  margin: 0 auto 11px;
}

.auth-brand {
  font-family: 'Archivo', sans-serif;
  font-size: 19px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: 0.04em;
  margin-bottom: 3px;
}

.auth-brand-sub {
  font-size: 11px;
  color: var(--blue-lt);
  letter-spacing: 0.04em;
  opacity: 0.85;
}

/* ---- Step Indicator ---- */
.auth-steps-bar {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 20px 36px 4px;
  gap: 0;
  background: #fff;
}

.step-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.step-dot {
  width: 30px; height: 30px;
  border-radius: 50%;
  border: 2px solid var(--g200);
  background: var(--g100);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700;
  color: var(--g400);
  transition: background 0.3s var(--ease), border-color 0.3s, color 0.3s, box-shadow 0.3s;
  flex-shrink: 0;
}

.step-dot.active {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
  box-shadow: 0 0 0 5px rgba(30,58,95,0.14);
}

.step-dot.done {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.step-dot.done::after {
  content: '✓';
  font-size: 13px;
}

.step-label {
  font-size: 10px;
  color: var(--g400);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: center;
  white-space: nowrap;
}

.step-label.active { color: var(--navy); }
.step-label.done   { color: var(--success); }

.step-line {
  width: 64px; height: 2px;
  background: var(--g200);
  margin-top: 14px;
  flex-shrink: 0;
  transition: background 0.4s;
}

.step-line.done { background: var(--success); }

/* ---- Body ---- */
.auth-body {
  padding: 24px 36px 28px;
}

.auth-step-panel {
  display: none;
}

.auth-step-panel.active {
  display: block;
  animation: slideIn 0.32s var(--ease) both;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

.auth-title {
  font-family: 'Archivo', sans-serif;
  font-size: 20px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 4px;
}

.auth-sub {
  font-size: 13px;
  color: var(--g600);
  margin-bottom: 22px;
  line-height: 1.55;
}

.auth-sub strong { color: var(--navy); }

/* ---- Form ---- */
.form-group { margin-bottom: 15px; }

.form-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--g600);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 7px;
}

.input-wrap { position: relative; }

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--g200);
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  color: var(--g900);
  background: var(--g50);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s;
  outline: none;
  -webkit-appearance: none;
}

.form-input:focus {
  border-color: var(--navy);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(30,58,95,0.10);
}

.form-input.has-error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.10);
}

.form-input[readonly] {
  background: var(--g100);
  color: var(--g600);
  cursor: default;
}

/* Password field with toggle */
.form-input.pw { padding-right: 44px; }

.pw-toggle {
  position: absolute;
  right: 13px; top: 50%;
  transform: translateY(-50%);
  background: none; border: none;
  cursor: pointer; padding: 4px;
  color: var(--g400);
  transition: color 0.18s;
  display: flex; align-items: center;
}
.pw-toggle:hover { color: var(--navy); }

/* OTP */
.otp-input {
  letter-spacing: 0.5em;
  font-size: 28px;
  font-weight: 700;
  text-align: center;
  font-family: 'Courier New', monospace;
  padding: 14px 16px;
}

/* Password strength */
.pw-strength-bars {
  display: flex; gap: 4px;
  margin-top: 7px;
}

.pw-bar {
  flex: 1; height: 3px;
  border-radius: 2px;
  background: var(--g200);
  transition: background 0.3s;
}
.pw-bar.weak   { background: var(--error); }
.pw-bar.medium { background: #f59e0b; }
.pw-bar.strong { background: var(--success); }

.pw-strength-label {
  font-size: 11px; color: var(--g400);
  margin-top: 4px; font-weight: 500;
}

/* ---- Alerts ---- */
.alert {
  display: none;
  align-items: flex-start;
  gap: 9px;
  padding: 11px 14px;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 16px;
  line-height: 1.45;
  border: 1px solid transparent;
}
.alert.show { display: flex; }
.alert.error   { background: #fef2f2; color: #b91c1c; border-color: #fecaca; }
.alert.success { background: #f0fdf4; color: #15803d; border-color: #bbf7d0; }
.alert svg { flex-shrink: 0; margin-top: 1px; }

/* ---- Buttons ---- */
.btn-primary {
  width: 100%;
  padding: 13px 20px;
  background: linear-gradient(135deg, var(--navy), var(--navy-lt));
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 14px; font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), opacity 0.2s;
  letter-spacing: 0.03em;
  margin-top: 6px;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  box-shadow: 0 4px 16px rgba(30,58,95,0.32);
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.08) 100%);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(30,58,95,0.4);
}
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

/* ---- OTP hint + resend ---- */
.otp-hint {
  font-size: 12px; color: var(--g400);
  text-align: center; margin-top: 14px;
  display: flex; align-items: center; justify-content: center; gap: 6px;
}

.btn-inline {
  background: none; border: none;
  color: var(--navy); font-weight: 700;
  font-size: 12px; font-family: inherit;
  cursor: pointer; text-decoration: underline;
  text-underline-offset: 2px; padding: 0;
  transition: color 0.18s;
}
.btn-inline:hover { color: var(--orange); }
.btn-inline:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---- Footer ---- */
.auth-footer {
  text-align: center;
  padding: 0 36px 26px;
  font-size: 13px;
  color: var(--g600);
  border-top: 1px solid var(--g100);
  margin-top: 4px;
  padding-top: 18px;
}
.auth-footer a {
  color: var(--navy);
  font-weight: 700;
  text-decoration: none;
}
.auth-footer a:hover { color: var(--orange); text-decoration: underline; }

/* ---- Divider ---- */
.auth-divider {
  display: flex; align-items: center; gap: 12px;
  color: var(--g300); font-size: 12px;
  margin: 18px 0 16px;
}
.auth-divider::before, .auth-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--g200);
}

/* ---- Spinner ---- */
.spinner {
  display: inline-block;
  width: 15px; height: 15px;
  border: 2px solid rgba(255,255,255,0.38);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Countdown ---- */
#resendTimer { font-variant-numeric: tabular-nums; }

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 500px) {
  .auth-bg { padding: 16px 12px; }
  .auth-card { border-radius: 18px; }
  .auth-header { padding: 22px 24px 18px; }
  .auth-body { padding: 20px 22px 22px; }
  .auth-footer { padding: 14px 22px 22px; }
  .auth-steps-bar { padding: 16px 22px 4px; }
  .step-line { width: 44px; }
  .auth-brand { font-size: 17px; }
  .auth-logo { height: 44px; }
}