/* =============================================
   about-contact.css — V4 Premium Design
   Sections: Hero / Form / Quick Bar
   Used by: about-contact.html
   ============================================= */

/* ===== Hero ===== */
.c4-hero {
  position: relative;
  width: 100%;
  height: clamp(388px, 53vh, 622px);
  overflow: hidden;
}

.c4-hero__overlay {
  position: absolute;
  top: var(--navbar-height, 80px);
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--container-max, 1320px);
  padding: 0 var(--container-padding, 24px);
  box-sizing: border-box;
  display: flex;
  justify-content: flex-end;
  overflow: hidden;
  background:
    linear-gradient(180deg,
      rgba(10, 10, 10, 0.35) 0%,
      rgba(10, 10, 10, 0.15) 35%,
      rgba(10, 10, 10, 0.55) 70%,
      rgba(10, 10, 10, 1) 100%
    );
}

.c4-hero__overlay img {
  height: 100%;
  width: auto;
  object-fit: contain;
  object-position: right center;
}

.c4-hero__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  height: 100%;
  max-width: var(--container-max, 1320px);
  margin: 0 auto;
  padding: calc(var(--navbar-height, 80px) + 32px + clamp(59px, 8vh, 94px)) var(--container-padding, 24px) 0;
}

.c4-hero__label {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-gold, #c9a96e);
  margin-bottom: 16px;
}

.c4-hero__title {
  font-family: var(--font-serif, 'HarmonyOS Sans SC', serif);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 600;
  color: var(--color-white, #ffffff);
  margin: 0 0 16px;
  line-height: 1.1;
}

.c4-hero__desc {
  font-size: clamp(0.9375rem, 1.3vw, 1.125rem);
  color: rgba(255, 255, 255, 0.68);
  line-height: 1.75;
  max-width: 560px;
  margin: 0;
}

.c4-hero__scroll {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--color-gold, #c9a96e);
  animation: c4-bounce 2s ease-in-out infinite;
}

.c4-hero__scroll span {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.7;
}

@keyframes c4-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

@media (max-width: 767px) {
  .c4-hero {
    height: clamp(296px, 53vh, 402px);
  }

  .c4-hero__content {
    padding-bottom: 48px;
  }

  .c4-hero__scroll {
    display: none;
  }
}

/* ===== Contact Form Section ===== */
.c4-form-section {
  background: #2a2a2a;
  padding: clamp(64px, 8vw, 100px) 0;
}

.c4-form-section__container {
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(36px, 5vw, 56px) clamp(60px, 8vw, 92px);
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 4px 40px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.06);
  position: relative;
}

/* 表单区域居中 Toast */
.c4f-toast {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(0.96);
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 10px;
  background: rgba(26, 26, 26, 0.92);
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 500;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.c4f-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.c4f-toast__icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #4ade80;
  color: #0f1a12;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.c4f-toast__icon svg {
  width: 12px;
  height: 12px;
}

.c4-form-section__header {
  text-align: center;
  margin-bottom: clamp(32px, 4vw, 48px);
}

.c4-form-section__title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  color: #1a1a1a;
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.c4-form-section__title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--color-gold, #c9a96e);
  border-radius: 2px;
  flex-shrink: 0;
}

.c4-form-section__subtitle {
  font-size: 0.9375rem;
  color: #888;
  margin: 0;
}

/* ===== Form Fields ===== */
.c4f__section {
  margin-bottom: 32px;
}

.c4f__section:last-of-type {
  margin-bottom: 24px;
}

.c4f__section-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #333;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.c4f__section-title::before {
  content: '';
  width: 3px;
  height: 14px;
  background: var(--color-gold, #c9a96e);
  border-radius: 2px;
  flex-shrink: 0;
}

.c4f__tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.c4f__tab {
  cursor: pointer;
  display: inline-block;
}

.c4f__tab input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.c4f__tab-label {
  display: inline-block;
  padding: 10px 28px;
  border: 1px solid #e0d6c2;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #888;
  background: transparent;
  transition: background 200ms ease, color 200ms ease, border-color 200ms ease;
  cursor: pointer;
  user-select: none;
}

.c4f__tab-label:hover {
  border-color: var(--color-gold, #c9a96e);
  color: #555;
}

.c4f__tab input:checked + .c4f__tab-label {
  background: var(--color-gold, #c9a96e);
  border-color: var(--color-gold, #c9a96e);
  color: #fff;
  font-weight: 600;
}

.c4f__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.c4f__field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.c4f__field--full {
  grid-column: 1 / -1;
}

.c4f__label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: #666;
}

.c4f__label--required::after {
  content: ' *';
  color: var(--color-gold, #c9a96e);
  font-size: 0.75rem;
}

.c4f__input,
.c4f__textarea {
  width: 100%;
  padding: 12px 16px;
  background: #f7f7f7;
  border: 1px solid #eee;
  border-radius: 6px;
  font-size: 0.9375rem;
  font-family: inherit;
  color: #333;
  outline: none;
  transition: border-color 200ms ease, box-shadow 200ms ease;
  box-sizing: border-box;
}

.c4f__input::placeholder,
.c4f__textarea::placeholder {
  color: #bbb;
}

.c4f__input:focus,
.c4f__textarea:focus {
  border-color: var(--color-gold, #c9a96e);
  box-shadow: 0 0 0 3px rgba(201, 169, 110, 0.12);
  background: #fff;
}

.c4f__input {
  height: 48px;
}

.c4f__textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.c4f__select-wrap {
  position: relative;
}

.c4f__select {
  width: 100%;
  height: 48px;
  padding: 12px 40px 12px 16px;
  background: #f7f7f7;
  border: 1px solid #eee;
  border-radius: 6px;
  font-size: 0.9375rem;
  font-family: inherit;
  color: #333;
  outline: none;
  appearance: none;
  cursor: pointer;
  transition: border-color 200ms ease, box-shadow 200ms ease;
  box-sizing: border-box;
}

.c4f__select:focus {
  border-color: var(--color-gold, #c9a96e);
  box-shadow: 0 0 0 3px rgba(201, 169, 110, 0.12);
  background: #fff;
}

.c4f__select option {
  background: #fff;
  color: #333;
}

.c4f__select-arrow {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: #bbb;
  pointer-events: none;
}

.c4f__agreements {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.c4f__check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.c4f__check input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.c4f__checkmark {
  width: 18px;
  height: 18px;
  border: 1px solid #ddd;
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 1px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 200ms ease, border-color 200ms ease;
  background: #fff;
}

.c4f__checkmark svg {
  opacity: 0;
  transform: scale(0.5);
  transition: opacity 200ms ease, transform 200ms ease;
}

.c4f__check input:checked + .c4f__checkmark {
  background: var(--color-gold, #c9a96e);
  border-color: var(--color-gold, #c9a96e);
}

.c4f__check input:checked + .c4f__checkmark svg {
  opacity: 1;
  transform: scale(1);
}

.c4f__check-text {
  font-size: 0.8125rem;
  color: #888;
  line-height: 1.5;
}

.c4f__check-text a {
  color: var(--color-gold, #c9a96e);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.c4f__submit {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 56px;
  background: var(--color-gold, #c9a96e);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 250ms ease, transform 200ms ease;
}

.c4f__submit:hover {
  background: #b8984f;
  transform: translateY(-1px);
}

.c4f__submit svg {
  transition: transform 250ms var(--ease-out, cubic-bezier(0.16, 1, 0.3, 1));
}

.c4f__submit:hover svg {
  transform: translateX(4px);
}

.c4f__submit-wrap {
  text-align: center;
}

/* ===== Quick Contact Bar ===== */
.c4-quick {
  background: #111;
  padding: clamp(56px, 7vw, 80px) 0 clamp(84px, 10.5vw, 120px);
  margin-bottom: clamp(80px, 10vw, 120px);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.c4-quick__container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
}

.c4-quick__title {
  text-align: center;
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  font-weight: 600;
  color: var(--color-white, #ffffff);
  margin-bottom: 48px;
}

.c4-quick__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.c4-quick__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 32px 24px;
  position: relative;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  transition: transform 300ms var(--ease-out, cubic-bezier(0.16, 1, 0.3, 1)),
              background 300ms ease,
              border-color 300ms ease;
}

.c4-quick__item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-gold, #c9a96e);
  transition: width 300ms var(--ease-out, cubic-bezier(0.16, 1, 0.3, 1));
}

.c4-quick__item:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(201, 169, 110, 0.3);
}

.c4-quick__item:hover::after {
  width: 48px;
}

.c4-quick__icon {
  color: var(--color-gold, #c9a96e);
  margin-bottom: 20px;
}

.c4-quick__name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-white, #ffffff);
  margin-bottom: 8px;
}

.c4-quick__value {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 4px;
}

.c4-quick__value--muted {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.35);
}

.c4-quick__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-gold, #c9a96e);
  text-decoration: none;
  margin-top: 12px;
  transition: gap 250ms ease;
}

.c4-quick__link:hover {
  gap: 10px;
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 1023px) {
  .c4-quick__grid {
    gap: 24px;
  }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 767px) {
  .c4-form-section__container {
    padding: 28px 29px;
  }

  .c4f__row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .c4f__tabs {
    gap: 8px;
  }

  .c4f__tab-label {
    padding: 8px 18px;
    font-size: 0.8125rem;
  }

  .c4-quick__grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .c4-quick__item {
    flex-direction: row;
    text-align: left;
    padding: 20px 16px;
    gap: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

  .c4-quick__item::after {
    display: none;
  }

  .c4-quick__icon {
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .c4-quick__item-body {
    flex: 1;
  }

  .c4-quick__link {
    margin-top: 6px;
  }
}