/* Production: form đăng ký, popup — không trùng class mockup (.page, .hero, …). */

/* Offset sticky header khi anchor / JS scroll tới form */
#registration {
  scroll-margin-top: 100px;
}

#dtd-form {
  scroll-margin-top: 100px;
}

/* ——— Registration (sau FAQ, trước footer mockup) ——— */
.section--registration {
  padding-block: clamp(28px, 3vw, 48px);
  background: linear-gradient(
    165deg,
    color-mix(in srgb, var(--blue) 88%, var(--text)) 0%,
    var(--blue) 45%,
    color-mix(in srgb, var(--cyan) 55%, var(--color-white)) 100%
  );
}

.section--registration .registration-card {
  width: 100%;
  max-width: 40rem;
  margin-inline: auto;
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  background: var(--color-white);
  box-shadow: var(--shadow-lg);
}

#registration-form-title.section-title--registration {
  margin: 0 0 var(--space-3);
  text-align: center;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

.registration-form__lead {
  margin: 0 0 var(--space-6);
  text-align: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
  max-width: 36rem;
  margin-inline: auto;
}

@media (min-width: 768px) {
  #registration-form-title.section-title--registration {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-4);
  }

  .registration-form__lead {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-8);
  }
}

#dtd-form.registration-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-width: 0;
}

#dtd-form.registration-form--submitting {
  opacity: 0.96;
}

#dtd-form.registration-form--submitting .form-submit:disabled {
  cursor: wait;
  opacity: 0.85;
}

#dtd-form .form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 0;
}

#dtd-form .form-field__error {
  margin: 0;
  min-height: 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-normal);
  color: var(--color-error);
}

#dtd-form .form-field__error:empty {
  display: none;
}

#dtd-form .form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

#dtd-form .form-input {
  width: 100%;
  max-width: 100%;
  min-height: 52px;
  padding: 0 var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-white);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

#dtd-form .form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 28%, transparent);
}

#dtd-form .form-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

#dtd-form .form-submit {
  width: 100%;
  max-width: 100%;
  min-height: 48px;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  cursor: pointer;
  border: none;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

#dtd-form .form-submit--secondary {
  border: 2px solid var(--color-primary);
  background: var(--color-white);
  color: var(--color-primary);
}

@media (hover: hover) and (pointer: fine) {
  #dtd-form .form-submit--secondary:hover {
    background: color-mix(in srgb, var(--color-primary) 8%, var(--color-white));
  }
}

#dtd-form .form-submit--primary {
  min-height: 56px;
  padding: var(--space-4) var(--space-10);
  border: 2px solid transparent;
  border-radius: var(--radius-lg-ui);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-sm);
}

@media (hover: hover) and (pointer: fine) {
  #dtd-form .form-submit--primary:hover {
    background: color-mix(in srgb, var(--color-primary) 90%, var(--color-text));
    transform: translateY(-1px);
  }
}

#dtd-form .form-submit:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

#dtd-form .form-note {
  margin: 0;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
}

#dtd-form .form-note--cskh {
  margin-top: var(--space-2);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-secondary) 22%, var(--color-bg));
  color: var(--color-text);
  text-align: center;
}

#dtd-form .form-note--security {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

#dtd-form .form-note__icon {
  flex-shrink: 0;
  font-size: var(--font-size-lg);
  line-height: 1;
}

/* ——— Full-screen loading (submit → webhook) ——— */
.form-submit-loading {
  position: fixed;
  inset: 0;
  z-index: 270;
  display: grid;
  place-items: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.form-submit-loading.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.form-submit-loading__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(6, 21, 79, 0.45);
}

.form-submit-loading__box {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-8) var(--space-10);
  border-radius: var(--radius-lg-ui);
  background: var(--color-white);
  box-shadow: var(--shadow);
  text-align: center;
}

.form-submit-loading__spinner {
  width: 48px;
  height: 48px;
  border: 4px solid color-mix(in srgb, var(--color-primary) 22%, transparent);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: form-submit-loading-spin 0.75s linear infinite;
}

@keyframes form-submit-loading-spin {
  to {
    transform: rotate(360deg);
  }
}

.form-submit-loading__label {
  margin: 0;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

/* ——— Popup (success / duplicate / error) ——— */
.popup {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.popup[aria-hidden="false"],
.popup.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.popup__overlay {
  position: absolute;
  inset: 0;
  background: rgba(6, 21, 79, 0.55);
}

.popup__card {
  position: relative;
  z-index: 1;
  width: min(100%, 26rem);
  padding: var(--space-8) var(--space-6);
  border-radius: var(--radius);
  background: var(--color-white);
  box-shadow: var(--shadow);
  text-align: center;
}

.popup__close {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--color-text) 8%, transparent);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  cursor: pointer;
}

.popup__icon {
  font-size: 2rem;
  margin-bottom: var(--space-3);
}

.popup__card h3 {
  margin: 0 0 var(--space-3);
  font-size: var(--font-size-xl);
  color: var(--navy);
}

.popup__body {
  margin: 0 0 var(--space-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--muted);
}

.popup .bubble-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  min-height: 48px;
  border-radius: 999px;
  background: linear-gradient(180deg, #ffb600 0%, #f4a500 100%);
  color: var(--color-white);
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.2);
}

/* ——— Registration modal overlay ——— */
#registration.registration-modal[hidden] {
  display: none !important;
}

#registration.registration-modal {
  position: fixed;
  inset: 0;
  z-index: 240;
  display: grid;
  place-items: center;
  padding: var(--space-4);
  overflow: auto;
  margin: 0;
  background: rgba(6, 21, 79, 0.65);
}

#registration.registration-modal.section--registration {
  /* Đè layout/padding background gradient của section gốc khi đã là modal. */
  padding-block: var(--space-4);
  background: rgba(6, 21, 79, 0.65);
}

#registration.registration-modal .section-inner {
  width: 100%;
  max-width: 44rem;
  padding-inline: 0;
  min-width: 0;
}

/* Tránh padding ngang chồng (.full-bleed + overlay) làm hẹp form trên mobile */
#registration.registration-modal.full-bleed {
  padding-inline: 0;
}

#registration.registration-modal .registration-card {
  margin-inline: auto;
  min-width: 0;
}

.registration-modal__close {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--color-white) 14%, transparent);
  color: var(--color-white);
  cursor: pointer;
  font-size: var(--font-size-lg);
  display: grid;
  place-items: center;
}

.registration-modal__close:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (max-width: 640px) {
  #registration.registration-modal {
    padding: max(10px, env(safe-area-inset-top, 0px))
      max(10px, env(safe-area-inset-right, 0px))
      max(10px, env(safe-area-inset-bottom, 0px))
      max(10px, env(safe-area-inset-left, 0px));
    place-items: start center;
    padding-top: max(44px, env(safe-area-inset-top, 0px));
    -webkit-overflow-scrolling: touch;
  }

  #registration.registration-modal .registration-card {
    padding: var(--space-4);
    border-radius: var(--radius-lg-ui);
    max-width: 100%;
  }

  .registration-modal__close {
    top: max(8px, env(safe-area-inset-top, 0px));
    right: max(8px, env(safe-area-inset-right, 0px));
    width: 2.25rem;
    height: 2.25rem;
    font-size: var(--font-size-base);
  }

  #registration-form-title.section-title--registration {
    font-size: clamp(16px, 4.2vw, var(--font-size-xl));
    margin-bottom: var(--space-2);
  }

  .registration-form__lead {
    margin-bottom: var(--space-4);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
  }

  #dtd-form.registration-form {
    gap: var(--space-3);
  }

  #dtd-form .form-input {
    min-height: 44px;
    padding: 0 var(--space-3);
    font-size: 16px; /* iOS: tránh zoom khi focus */
  }

  #dtd-form .form-submit--primary {
    font-size: var(--font-size-base);
    padding: var(--space-3) var(--space-4);
    min-height: 48px;
    line-height: 1.25;
    white-space: normal;
  }

  #dtd-form .form-submit--secondary {
    white-space: normal;
    line-height: 1.25;
  }

  #dtd-form .form-note--cskh,
  #dtd-form .form-note--security {
    font-size: var(--font-size-xs);
  }

  #dtd-form .form-note--cskh {
    padding: var(--space-2);
  }

  #dtd-form .form-note--security {
    padding-top: var(--space-3);
  }
}

/* Điện thoại nhỏ — tối đa không gian nội dung */
@media (max-width: 480px) {
  #registration.registration-modal {
    padding-left: max(6px, env(safe-area-inset-left, 0px));
    padding-right: max(6px, env(safe-area-inset-right, 0px));
    padding-top: max(40px, env(safe-area-inset-top, 0px));
    padding-bottom: max(8px, env(safe-area-inset-bottom, 0px));
  }

  #registration.registration-modal .registration-card {
    padding: var(--space-3);
    border-radius: var(--radius-md);
  }

  #registration-form-title.section-title--registration {
    font-size: clamp(15px, 4vw, 17px);
    line-height: 1.3;
  }

  .registration-form__lead {
    font-size: var(--font-size-xs);
    margin-bottom: var(--space-3);
    line-height: 1.45;
  }

  #dtd-form .form-label {
    font-size: var(--font-size-xs);
  }

  #dtd-form .form-submit {
    min-height: 44px;
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
  }

  #dtd-form .form-submit--primary {
    min-height: 46px;
    padding: var(--space-3);
    font-size: 13px;
  }

  .registration-modal__close {
    width: 2rem;
    height: 2rem;
    font-size: var(--font-size-lg);
  }
}

/* iPhone SE / ~320px — vẫn đọc và chạm được */
@media (max-width: 360px) {
  #registration.registration-modal {
    padding-left: max(4px, env(safe-area-inset-left, 0px));
    padding-right: max(4px, env(safe-area-inset-right, 0px));
    padding-top: max(38px, env(safe-area-inset-top, 0px));
  }

  #registration.registration-modal .registration-card {
    padding: 10px;
    box-shadow: var(--shadow-md);
  }

  #registration-form-title.section-title--registration {
    font-size: 14px;
    margin-bottom: var(--space-2);
  }

  .registration-form__lead {
    font-size: 11px;
    margin-bottom: var(--space-2);
  }

  #dtd-form.registration-form {
    gap: 10px;
  }

  #dtd-form .form-field {
    gap: 4px;
  }

  #dtd-form .form-input {
    min-height: 44px;
    padding: 0 10px;
    border-radius: var(--radius-sm);
  }

  #dtd-form .form-submit {
    font-size: 11px;
    padding: 8px 10px;
    min-height: 44px;
  }

  #dtd-form .form-submit--primary {
    font-size: 12px;
    padding: 10px;
    min-height: 46px;
  }

  #dtd-form .form-note--cskh,
  #dtd-form .form-note--security {
    font-size: 10px;
    line-height: 1.4;
  }

  #dtd-form .form-note__icon {
    font-size: var(--font-size-base);
  }

  .registration-modal__close {
    width: 36px;
    height: 36px;
    top: max(6px, env(safe-area-inset-top, 0px));
    right: max(6px, env(safe-area-inset-right, 0px));
  }
}