/* ── animated background ── */
.bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.22;
  animation: drift 12s ease-in-out infinite alternate;
}
.bg-blob:nth-child(1) {
  width: 500px;
  height: 500px;
  background: var(--accent);
  top: -120px;
  left: -100px;
  animation-duration: 14s;
}
.bg-blob:nth-child(2) {
  width: 400px;
  height: 400px;
  background: var(--accent2);
  bottom: -80px;
  right: -60px;
  animation-duration: 10s;
  animation-direction: alternate-reverse;
}
.bg-blob:nth-child(3) {
  width: 300px;
  height: 300px;
  background: #06b6d4;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-duration: 18s;
}
@keyframes drift {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(40px, 30px) scale(1.08);
  }
}

/* grid dots overlay */
.bg-canvas::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(
    circle,
    rgba(59, 111, 240, 0.08) 1px,
    transparent 1px
  );
  background-size: 32px 32px;
}

/* ── card ── */
.login-wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  padding: 16px;
  animation: slideUp 0.55s cubic-bezier(0.22, 0.68, 0, 1.2) both;
}
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--login-border);
  border-radius: 24px;
  padding: 40px 36px 36px;
  box-shadow:
    0 20px 60px rgba(59, 111, 240, 0.1),
    0 2px 8px rgba(0, 0, 0, 0.06),
    0 0 0 1px rgba(0, 0, 0, 0.04) inset;
  backdrop-filter: blur(4px);
}

.login-title {
  font-family: "Syne", sans-serif;
  font-size: 28px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 6px;
  letter-spacing: -0.5px;
}
.login-subtitle {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 32px;
}

/* ── form fields ── */
.field-group {
  margin-bottom: 20px;
}
.field-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 8px;
}
.input-wrap {
  position: relative;
}
.input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  font-size: 16px;
  transition: color 0.2s;
}
.form-control {
  width: 100%;
  background: #f8faff;
  border: 1.5px solid var(--login-border);
  border-radius: var(--radius);
  color: var(--login-text);
  font-family: "DM Sans", sans-serif;
  font-size: 15px;
  padding: 13px 14px 13px 40px;
  outline: none;
  transition:
    border-color 0.2s,
    box-shadow 0.2s,
    background 0.2s;
  -webkit-appearance: none;
}
.form-control::placeholder {
  color: #b0b8cc;
}
.form-control:focus {
  border-color: var(--accent);
  background: #eef3ff;
  box-shadow: 0 0 0 4px rgba(59, 111, 240, 0.12);
}
.form-control:focus + .input-icon,
.input-wrap:focus-within .input-icon {
  color: var(--accent);
}

/* password toggle */
.pass-toggle {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 16px;
  padding: 4px;
  transition: color 0.2s;
}
.pass-toggle:hover {
  color: var(--login-text);
}

/* validation states */
.form-control.is-invalid {
  border-color: var(--error);
  background: rgba(248, 113, 113, 0.05);
}
.form-control.is-valid {
  border-color: var(--success);
}
.invalid-feedback {
  display: block;
  font-size: 12px;
  color: var(--error);
  margin-top: 6px;
  padding-left: 4px;
}
.valid-feedback {
  display: block;
  font-size: 12px;
  color: var(--success);
  margin-top: 6px;
  padding-left: 4px;
}

/* strength bar */
.strength-bar {
  display: flex;
  gap: 4px;
  margin-top: 8px;
}
.strength-segment {
  height: 3px;
  flex: 1;
  border-radius: 99px;
  background: var(--login-border);
  transition: background 0.3s;
}

/* ── checkbox ── */
.check-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}
.check-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
  border-radius: 4px;
}
.check-row label {
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

/* ── submit button ── */
.btn-login {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-family: "Syne", sans-serif;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.2px;
  padding: 14px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition:
    opacity 0.2s,
    transform 0.15s,
    box-shadow 0.2s;
  box-shadow: 0 8px 28px rgba(59, 111, 240, 0.25);
}
.btn-login::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0);
  transition: background 0.2s;
}
.btn-login:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  box-shadow: 0 12px 36px rgba(59, 111, 240, 0.35);
}
.btn-login:active {
  transform: translateY(0);
}
.btn-login:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* spinner inside button */
.btn-login .spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2.5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin: 0 auto;
}
.btn-login.loading .btn-text {
  display: none;
}
.btn-login.loading .spinner {
  display: block;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ── footer links ── */
.login-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 24px;
}
.login-footer a {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}
.login-footer a:hover {
  color: var(--accent);
}
.login-footer .sep {
  color: var(--login-border);
}

/* register link */
.register-row {
  text-align: center;
  margin-top: 28px;
  font-size: 13px;
  color: var(--muted);
}
.register-row a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
}
.register-row a:hover {
  opacity: 0.8;
}

/* ── error flash ── */
.alert-error {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.25);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--error);
  margin-bottom: 24px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

/* ══════════════════════════════════════
   MOBILE — bottom-sheet modal
   ══════════════════════════════════════ */
@media (max-width: 600px) {
  body {
    align-items: flex-end;
  }

  /* dim backdrop */
  .bg-canvas {
    background: rgba(15, 18, 30, 0.45);
    backdrop-filter: blur(6px);
  }
  .bg-blob {
    display: none;
  }
  .bg-canvas::after {
    display: none;
  }

  /* sheet wrapper takes full width, slides up from bottom */
  .login-wrap {
    max-width: 100%;
    padding: 0;
    width: 100%;
    animation: sheetUp 0.42s cubic-bezier(0.32, 1.2, 0.42, 1) both;
  }
  @keyframes sheetUp {
    from {
      transform: translateY(100%);
      opacity: 0.6;
    }
    to {
      transform: translateY(0);
      opacity: 1;
    }
  }

  .login-card {
    border-radius: 28px 28px 0 0;
    padding: 12px 24px 40px;
    border-bottom: none;
    /* safe-area for iPhones */
    padding-bottom: calc(32px + env(safe-area-inset-bottom));
    box-shadow:
      0 -8px 40px rgba(59, 111, 240, 0.12),
      0 -2px 12px rgba(0, 0, 0, 0.08);
  }

  /* drag handle */
  .login-card::before {
    content: "";
    display: block;
    width: 40px;
    height: 4px;
    background: var(--login-border);
    border-radius: 99px;
    margin: 0 auto 24px;
  }

  /* slightly smaller title on mobile */
  .login-title {
    font-size: 22px;
  }
  .login-subtitle {
    margin-bottom: 24px;
  }
  .login-logo {
    margin-bottom: 20px;
  }
  .field-group {
    margin-bottom: 16px;
  }
  .check-row {
    margin-bottom: 20px;
  }

  /* bigger tap targets */
  .form-control {
    font-size: 16px;
    padding: 14px 14px 14px 42px;
  }
  .btn-login {
    padding: 16px;
    font-size: 16px;
    border-radius: 16px;
  }

  /* pull sheet down gesture */
  .login-card.dragging {
    transition: none !important;
  }
}