:root[data-theme="light"] {
  --bg-main: #f0f4ff;
  --bg-card: #ffffff;
  --bg-input: #f5f7ff;
  --bg-input-focus: #eef1ff;
  --border: #d0d8f0;
  --border-focus: #4f80ff;
  --text-primary: #0f1c3f;
  --text-secondary: #4a5580;
  --text-muted: #8892b0;
  --accent: #3b6ef5;
  --accent-hover: #2a5de0;
  --accent-light: #e8eeff;
  --btn-text: #ffffff;
  --shadow: 0 8px 40px rgba(59,110,245,0.10);
  --shadow-card: 0 2px 24px rgba(59,110,245,0.07);
  --divider: #e2e8f8;
  --link: #3b6ef5;
  --modal-bg: rgba(15,28,63,0.35);
  --toggle-bg: #e2e8f8;
  --toggle-knob: #3b6ef5;
  --logo-circle: #3b6ef5;
}
:root[data-theme="dark"] {
  --bg-main: #0b1120;
  --bg-card: #131e35;
  --bg-input: #1a2540;
  --bg-input-focus: #1e2d4d;
  --border: #1e2d4d;
  --border-focus: #4f80ff;
  --text-primary: #e8eeff;
  --text-secondary: #8fa8d0;
  --text-muted: #4a5f80;
  --accent: #4f80ff;
  --accent-hover: #3b6ef5;
  --accent-light: #1a2d55;
  --btn-text: #ffffff;
  --shadow: 0 8px 40px rgba(79,128,255,0.13);
  --shadow-card: 0 2px 24px rgba(0,0,0,0.35);
  --divider: #1e2d4d;
  --link: #6699ff;
  --modal-bg: rgba(0,0,0,0.65);
  --toggle-bg: #1a2540;
  --toggle-knob: #4f80ff;
  --logo-circle: #4f80ff;
}

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

body {
  background: var(--bg-main);
  color: var(--text-primary);
  font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, color 0.3s;
  padding: 24px 16px;
}

/* ── Top Bar ── */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--divider);
  z-index: 100;
  transition: background 0.3s, border-color 0.3s;
}
.topbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.topbar-logo svg { display: block; }
.topbar-right { display: flex; align-items: center; gap: 14px; }
.topbar-link {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
  cursor: pointer;
}
.topbar-link:hover { color: var(--accent); }

/* ── Theme Toggle ── */
.theme-toggle {
  background: var(--toggle-bg);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  width: 46px;
  height: 26px;
  cursor: pointer;
  position: relative;
  transition: background 0.3s, border-color 0.3s;
  flex-shrink: 0;
}
.theme-toggle::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--toggle-knob);
  transition: transform 0.3s, background 0.3s;
}
[data-theme="dark"] .theme-toggle::after { transform: translateX(20px); }
.toggle-icon {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  font-size: 11px;
  pointer-events: none;
}
.toggle-icon.sun { left: 5px; }
.toggle-icon.moon { right: 4px; }

/* ── Card ── */
.card-wrap {
  width: 100%;
  max-width: 420px;
  margin-top: 72px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 36px 36px;
  box-shadow: var(--shadow-card);
  transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
}

/* ── Views ── */
.view { display: none; }
.view.active { display: block; }

/* ── Logo Block ── */
.logo-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 28px;
}
.logo-circle {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--logo-circle);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 14px;
  box-shadow: 0 4px 18px rgba(79,128,255,0.3);
}
.logo-circle svg { display: block; }
.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  text-align: center;
}
.card-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 5px;
  text-align: center;
}

/* ── Form ── */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 7px;
  letter-spacing: 0.02em;
}
.form-group input {
  width: 100%;
  padding: 11px 14px;
  border-radius: 9px;
  border: 1.5px solid var(--border);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}
.form-group input:focus {
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px rgba(79,128,255,0.13);
}
.form-group input::placeholder { color: var(--text-muted); }

/* ── Password wrapper ── */
.pw-wrap { position: relative; }
.pw-wrap input { padding-right: 42px; }
.pw-toggle {
  position: absolute;
  right: 12px; top: 50%;
  transform: translateY(-50%);
  background: none; border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 2px;
  display: flex; align-items: center;
  transition: color 0.2s;
}
.pw-toggle:hover { color: var(--accent); }

/* ── Row helpers ── */
.form-row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.checkbox-label {
  display: flex; align-items: center; gap: 7px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}
.checkbox-label input[type="checkbox"] {
  width: 16px; height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}
.text-link {
  font-size: 0.82rem;
  color: var(--link);
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s;
  background: none; border: none; padding: 0;
  font-family: inherit;
}
.text-link:hover { opacity: 0.75; text-decoration: underline; }

/* ── Buttons ── */
.btn-primary {
  width: 100%;
  padding: 12px;
  border-radius: 9px;
  background: var(--accent);
  color: var(--btn-text);
  font-size: 0.97rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(79,128,255,0.25);
  letter-spacing: 0.01em;
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 6px 20px rgba(79,128,255,0.35);
}
.btn-primary:active { transform: scale(0.98); }

/* ── Divider ── */
.divider {
  display: flex; align-items: center; gap: 10px;
  margin: 22px 0;
  color: var(--text-muted);
  font-size: 0.78rem;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--divider);
}

/* ── Social buttons ── */
.btn-social {
  width: 100%;
  padding: 11px 14px;
  border-radius: 9px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 9px;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
  margin-bottom: 10px;
  font-family: inherit;
}
.btn-social:hover {
  background: var(--bg-input-focus);
  border-color: var(--border-focus);
  box-shadow: 0 2px 10px rgba(79,128,255,0.10);
}
.btn-social svg { flex-shrink: 0; }

/* ── Bottom Text ── */
.card-bottom {
  text-align: center;
  margin-top: 22px;
  font-size: 0.83rem;
  color: var(--text-muted);
}
.card-bottom span { color: var(--link); cursor: pointer; transition: opacity 0.2s; }
.card-bottom span:hover { opacity: 0.75; text-decoration: underline; }

/* ── Back button ── */
.btn-back {
  display: inline-flex; align-items: center; gap: 5px;
  background: none; border: none;
  color: var(--text-secondary);
  font-size: 0.82rem;
  cursor: pointer;
  padding: 0 0 18px 0;
  font-family: inherit;
  transition: color 0.2s;
}
.btn-back:hover { color: var(--accent); }

/* ── Success note ── */
.success-note {
  background: var(--accent-light);
  border: 1.5px solid var(--border-focus);
  border-radius: 9px;
  padding: 12px 14px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.5;
}
.success-note strong { color: var(--accent); }

/* ── Name row ── */
.name-row { display: flex; gap: 10px; }
.name-row .form-group { flex: 1; }

/* ── Modal ── */
.modal-overlay {
  position: fixed; inset: 0;
  background: var(--modal-bg);
  display: flex; align-items: center; justify-content: center;
  z-index: 999;
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s;
  backdrop-filter: blur(4px);
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 32px 30px;
  max-width: 380px;
  width: 90%;
  box-shadow: var(--shadow);
  transform: translateY(16px) scale(0.97);
  transition: transform 0.25s, opacity 0.25s;
  opacity: 0;
}
.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
  opacity: 1;
}
.modal-icon {
  width: 50px; height: 50px;
  border-radius: 50%;
  background: #ff4d4d22;
  border: 2px solid #ff4d4d44;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.5rem;
}
.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 10px;
}
.modal-body {
  font-size: 0.87rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.6;
  margin-bottom: 24px;
}
.modal-body strong { color: #ff6b6b; }
.btn-modal-close {
  width: 100%;
  padding: 11px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  border: none;
  font-size: 0.93rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  font-family: inherit;
}
.btn-modal-close:hover { background: var(--accent-hover); }

/* ── Responsive ── */
@media (max-width: 480px) {
  .card { padding: 30px 20px 26px; }
  .name-row { flex-direction: column; gap: 0; }
  .topbar { padding: 0 16px; }
}