/* ── Design tokens ─────────────────────────────────────── */
:root {
  --charcoal:    #0d1117;
  --blue:        #0e3a7d;
  --blue-h:      #0b2f66;
  --orange:      #c05200;
  --white:       #ffffff;
  --light:       #f4f6f9;
  --border:      #d1d5db;
  --weak:        rgba(13,17,23,0.62);
  --disabled:    rgba(13,17,23,0.35);
  --blue-tint:   rgba(14,58,125,0.10);
  --orange-tint: rgba(192,82,0,0.10);
  --shadow-blue: rgba(0,0,0,0.28) 0px 0px 1px,
                 rgba(0,0,0,0.07) 0px 0px 2px,
                 rgba(14,58,125,0.22) 0px 1px 3px,
                 rgba(0,0,0,0.05) 0px 0px 0px 0.5px inset;
  --shadow-card: rgba(0,0,0,0.06) 0px 0px 0px 1px,
                 rgba(0,0,0,0.08) 0px 4px 8px,
                 rgba(14,58,125,0.09) 0px 12px 28px;
  --font: 'Inter', -apple-system, system-ui, 'Segoe UI', sans-serif;
  --r-xs: 4px; --r-sm: 8px; --r-md: 12px; --r-lg: 16px; --r-xl: 24px;
}

/* ── Reset & base ──────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 16px;
  color: var(--charcoal);
  background: var(--light);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  letter-spacing: 0.08px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
button { font-family: inherit; }
a { color: inherit; text-decoration: none; }

/* ── Navigation ─────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}
.nav.scrolled {
  background: rgba(255,255,255,0.95);
  border-color: var(--border);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 13px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--charcoal);
  letter-spacing: 0.14px;
  flex-shrink: 0;
}
.nav-links { display: flex; gap: 2px; flex: 1; }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--r-md);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.08px;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.14s, box-shadow 0.14s, border-color 0.14s, transform 0.1s;
}
.btn:active { transform: translateY(1px); }
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-lg { padding: 15px 28px; font-size: 16px; }
.btn-blue { background: var(--blue); color: var(--white); border-color: var(--blue); }
.btn-blue:hover { background: var(--blue-h); border-color: var(--blue-h); box-shadow: var(--shadow-blue); }

/* ── Eyebrow ────────────────────────────────────────────── */
.eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.55px;
  text-transform: uppercase;
  color: var(--orange);
  background: var(--orange-tint);
  padding: 5px 11px;
  border-radius: var(--r-xs);
  margin-bottom: 20px;
}

/* ── Language switch ────────────────────────────────────── */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 1px;
  background: var(--light);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 2px;
  flex-shrink: 0;
}
.lang-btn {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.32px;
  padding: 4px 8px;
  border-radius: 6px;
  color: var(--weak);
  transition: color 0.14s, background 0.14s;
  line-height: 1;
}
.lang-btn:hover { color: var(--charcoal); }
.lang-btn.active {
  background: var(--white);
  color: var(--blue);
  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}

/* ── Auth layout ────────────────────────────────────────── */
.auth-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px 64px;
}
.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 40px;
  box-shadow: var(--shadow-card);
}
.auth-header { margin-bottom: 28px; }
.auth-header h1 {
  font-size: 24px;
  font-weight: 500;
  color: var(--charcoal);
  letter-spacing: -0.2px;
  margin-bottom: 8px;
  line-height: 1.20;
}
.auth-header p {
  font-size: 14px;
  color: var(--weak);
  letter-spacing: 0.10px;
  line-height: 1.55;
}

/* ── Form ───────────────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--charcoal);
  letter-spacing: 0.07px;
  margin-bottom: 6px;
}
.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-family: var(--font);
  font-size: 15px;
  color: var(--charcoal);
  background: var(--white);
  transition: border-color 0.14s, box-shadow 0.14s;
  outline: none;
  letter-spacing: 0.08px;
  box-sizing: border-box;
}
.form-input::placeholder { color: rgba(13,17,23,0.35); }
.form-input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(14,58,125,0.14);
}
.form-input.is-error {
  border-color: #b91c1c;
  box-shadow: 0 0 0 3px rgba(185,28,28,0.10);
}
.form-field-error {
  display: none;
  font-size: 12px;
  color: #b91c1c;
  letter-spacing: 0.07px;
  margin-top: 5px;
}
.form-field-error.visible { display: block; }

/* ── Alerts ─────────────────────────────────────────────── */
.auth-alert {
  padding: 12px 16px;
  border-radius: var(--r-md);
  font-size: 14px;
  letter-spacing: 0.08px;
  line-height: 1.5;
  margin-bottom: 20px;
  display: none;
}
.auth-alert.visible { display: block; }
.auth-alert-error {
  background: rgba(185,28,28,0.07);
  color: #b91c1c;
  border: 1px solid rgba(185,28,28,0.18);
}
.auth-alert-success {
  background: rgba(22,101,52,0.07);
  color: #166534;
  border: 1px solid rgba(22,101,52,0.18);
}

/* ── Auth misc ──────────────────────────────────────────── */
.auth-submit { width: 100%; margin-top: 4px; }
.auth-footer-link {
  text-align: center;
  font-size: 14px;
  color: var(--weak);
  letter-spacing: 0.08px;
  margin-top: 20px;
}
.auth-footer-link a { color: var(--blue); font-weight: 500; }
.auth-footer-link a:hover { text-decoration: underline; }
.auth-password-wrap { position: relative; }
.auth-toggle-pw {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--weak);
  padding: 0;
  line-height: 1;
  display: flex;
  align-items: center;
}
.auth-toggle-pw:hover { color: var(--charcoal); }

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 480px) {
  .auth-card { padding: 28px 20px; }
  .auth-header h1 { font-size: 22px; }
  .nav-inner { padding: 13px 16px; }
}