/* ============================================
   组件样式 - 克制、简洁、小圆角
   ============================================ */

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
}

/* 主按钮 - 本草绿 */
.btn--primary {
  background: var(--wct-green);
  color: #fff;
  border-color: var(--wct-green);
}

.btn--primary:hover {
  background: var(--wct-green-light);
  border-color: var(--wct-green-light);
}

/* 次要按钮 - 描边 */
.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--wct-green);
  color: var(--wct-green);
}

/* 金色按钮 - 仅重点使用 */
.btn--gold {
  background: var(--wct-gold);
  color: var(--wct-green);
  border-color: var(--wct-gold);
}

.btn--gold:hover {
  background: var(--wct-gold-light);
}

.btn--lg {
  padding: var(--sp-4) var(--sp-8);
  font-size: var(--fs-base);
}

.btn--block {
  width: 100%;
}

/* ---- Header ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(253, 252, 249, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: var(--z-header);
  transition: all var(--transition-base);
}

.site-header__inner {
  max-width: var(--container-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.03em;
}

.logo__icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo__text-en {
  font-family: var(--font-en-sans);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* Nav */
.main-nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.main-nav__link {
  font-size: var(--fs-sm);
  font-weight: 400;
  color: var(--color-text-secondary);
  position: relative;
  padding: var(--sp-2) 0;
  transition: color var(--transition-fast);
}

.main-nav__link:hover,
.main-nav__link.active {
  color: var(--wct-green);
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  padding: var(--sp-1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
}

.lang-switch__btn {
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.lang-switch__btn.active {
  background: var(--wct-green);
  color: #fff;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 24px;
  height: 24px;
  justify-content: center;
  align-items: center;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all var(--transition-base);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--color-bg-rice);
  color: var(--color-text-secondary);
  padding: var(--sp-16) 0 var(--sp-8);
  border-top: 1px solid var(--color-border);
  position: relative;
}

.footer-landscape {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  height: 100px;
  overflow: hidden;
  pointer-events: none;
}

.footer-landscape img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center bottom;
  opacity: 0.06;
}

.site-footer a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.site-footer a:hover {
  color: var(--wct-green);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--sp-12);
  margin-bottom: var(--sp-12);
}

.footer-brand__logo {
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  color: var(--color-text);
  margin-bottom: var(--sp-3);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.footer-brand__logo img {
  width: 32px;
  height: 32px;
}

.footer-brand__slogan {
  font-size: var(--fs-base);
  color: var(--wct-green);
  margin-bottom: var(--sp-4);
  font-family: var(--font-serif);
  letter-spacing: 0.05em;
}

.footer-brand__company {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--sp-1);
}

.footer-brand__address {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--sp-4);
}

.footer-col__title {
  color: var(--color-text);
  font-size: var(--fs-sm);
  font-weight: 600;
  margin-bottom: var(--sp-4);
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
}

.footer-col__list li {
  margin-bottom: var(--sp-3);
}

.footer-col__list a {
  font-size: var(--fs-sm);
}

.footer-contact__item {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  margin-bottom: var(--sp-3);
  font-size: var(--fs-sm);
}

.footer-contact__icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 2px;
  color: var(--color-text-light);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--sp-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--fs-xs);
  color: var(--color-text-light);
}

.footer-bottom__links {
  display: flex;
  gap: var(--sp-6);
}

/* ---- Cards ---- */
.card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-md);
}

.card__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-warm);
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

/* 图片加载错误时的样式 */
.image-error {
  background: var(--color-bg-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.image-error::after {
  content: '图片加载失败';
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}

.card:hover .card__image img {
  transform: scale(1.02);
}

.card__body {
  padding: var(--sp-5);
}

.card__title {
  font-size: var(--fs-base);
  margin-bottom: var(--sp-2);
  font-weight: 500;
}

.card__text {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ---- Tags ---- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--sp-3);
  font-size: var(--fs-xs);
  font-weight: 400;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
}

.tag--green {
  background: rgba(26, 67, 50, 0.06);
  color: var(--wct-green);
}

.tag--gold {
  background: rgba(226, 185, 127, 0.12);
  color: #8B7355;
}


.tag--outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

/* ---- Forms ---- */
.form-group {
  margin-bottom: var(--sp-5);
}

.form-label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--sp-2);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-white);
  color: var(--color-text);
  font-size: var(--fs-base);
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--wct-green);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* ---- Section Header ---- */
.section-header {
  text-align: center;
  margin-bottom: var(--sp-12);
}

.section-header__eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: var(--sp-4);
}

.section-header__title {
  font-size: var(--fs-3xl);
  margin-bottom: var(--sp-4);
  font-weight: 500;
}

.section-header__subtitle {
  font-size: var(--fs-base);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

.section-header__divider {
  width: 40px;
  height: 1px;
  background: var(--wct-gold);
  margin: var(--sp-5) auto;
}

/* ---- Filter Tabs ---- */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  justify-content: center;
  margin-bottom: var(--sp-10);
}

.filter-tab {
  padding: var(--sp-2) var(--sp-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  background: transparent;
}

.filter-tab:hover {
  border-color: var(--wct-green);
  color: var(--wct-green);
}

.filter-tab.active {
  background: var(--wct-green);
  border-color: var(--wct-green);
  color: #fff;
}

/* ---- Back to Top ---- */
.back-to-top {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-6);
  width: 40px;
  height: 40px;
  background: var(--color-bg-white);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: var(--z-overlay);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  border-color: var(--wct-green);
  color: var(--wct-green);
}

/* ---- Mobile Nav ---- */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100vh;
  background: var(--color-bg);
  z-index: var(--z-overlay);
  transition: right var(--transition-base);
  padding: var(--sp-12) var(--sp-6);
  overflow-y: auto;
  box-shadow: -2px 0 16px rgba(0, 0, 0, 0.08);
}

.mobile-nav.active {
  right: 0;
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.mobile-nav__link {
  display: block;
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-base);
  font-weight: 400;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  background: var(--color-bg-warm);
  color: var(--wct-green);
}

.mobile-nav__close {
  position: absolute;
  top: var(--sp-4);
  right: var(--sp-4);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-2xl);
  color: var(--color-text);
}

.mobile-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .site-header {
    height: var(--header-height-mobile);
  }

  .main-nav__list {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--sp-3);
    text-align: center;
  }

  .back-to-top {
    width: 36px;
    height: 36px;
    bottom: var(--sp-4);
    right: var(--sp-4);
  }
}

/* ---- Wancaotang AI Guide ---- */
.ai-guide {
  position: fixed;
  right: 24px;
  bottom: 88px;
  z-index: 1040;
  font-family: var(--font-sans);
}

.ai-guide__toggle {
  min-width: 132px;
  height: 48px;
  padding: 0 18px 0 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  color: #fff;
  background: var(--wct-green);
  border: 1px solid rgba(226, 185, 127, 0.72);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(26, 67, 50, 0.2);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.ai-guide__toggle:hover {
  background: var(--wct-green-light);
  transform: translateY(-1px);
}

.ai-guide__toggle img {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.ai-guide.is-open .ai-guide__toggle {
  visibility: hidden;
}

.ai-guide__panel {
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(390px, calc(100vw - 32px));
  height: min(610px, calc(100vh - 112px));
  min-height: 480px;
  overflow: hidden;
  background: #fdfcf9;
  border: 1px solid rgba(26, 67, 50, 0.14);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 64px rgba(22, 37, 31, 0.2);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto auto;
}

.ai-guide__panel[hidden] {
  display: none;
}

.ai-guide__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 18px 16px;
  color: #fff;
  background: var(--wct-green);
  border-bottom: 2px solid var(--wct-gold);
}

.ai-guide__title {
  margin: 0 0 4px;
  color: #fff;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.ai-guide__disclosure {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 11px;
  line-height: 1.5;
}

.ai-guide__close {
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  color: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  font-size: 24px;
  line-height: 1;
}

.ai-guide__close:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
}

.ai-guide__messages {
  overflow-y: auto;
  padding: 18px;
  background:
    linear-gradient(rgba(253, 252, 249, 0.96), rgba(253, 252, 249, 0.96)),
    url('../assets/images/decor/wct-landscape-xishan-official.png') center bottom / 100% auto no-repeat;
}

.ai-guide__message {
  width: fit-content;
  max-width: 88%;
  margin-bottom: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.ai-guide__message--assistant {
  color: var(--color-text-secondary);
  background: var(--color-bg-rice);
  border: 1px solid var(--color-border-light);
}

.ai-guide__message--user {
  margin-left: auto;
  color: #fff;
  background: var(--wct-green);
}

.ai-guide__message[data-temporary='true'] {
  color: var(--color-text-muted);
}

.ai-guide__suggestions {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 18px 12px;
  scrollbar-width: none;
}

.ai-guide__suggestions::-webkit-scrollbar {
  display: none;
}

.ai-guide__suggestions[hidden] {
  display: none;
}

.ai-guide__suggestion {
  flex: 0 0 auto;
  padding: 7px 10px;
  color: var(--wct-green);
  background: rgba(226, 185, 127, 0.11);
  border: 1px solid rgba(226, 185, 127, 0.55);
  border-radius: var(--radius-sm);
  font-size: 12px;
  white-space: nowrap;
}

.ai-guide__suggestion:hover {
  background: rgba(226, 185, 127, 0.2);
}

.ai-guide__form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 9px;
  padding: 12px 18px;
  border-top: 1px solid var(--color-border-light);
}

.ai-guide__input {
  width: 100%;
  min-height: 44px;
  max-height: 96px;
  resize: vertical;
  padding: 10px 11px;
  color: var(--color-text);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 13px;
  line-height: 1.5;
}

.ai-guide__input:focus {
  outline: 2px solid rgba(26, 67, 50, 0.16);
  border-color: var(--wct-green);
}

.ai-guide__submit {
  height: 44px;
  padding: 0 15px;
  color: #fff;
  background: var(--wct-green);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
}

.ai-guide__submit:disabled {
  cursor: wait;
  opacity: 0.55;
}

.ai-guide__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 18px 14px;
}

.ai-guide__privacy {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 10px;
  line-height: 1.45;
}

.ai-guide__contact {
  flex: 0 0 auto;
  color: var(--wct-green);
  font-size: 11px;
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 767px) {
  .ai-guide {
    right: 14px;
    bottom: 76px;
  }

  .ai-guide__toggle {
    min-width: 118px;
    height: 44px;
    padding-right: 14px;
    font-size: 13px;
  }

  .ai-guide__panel {
    position: fixed;
    right: 12px;
    bottom: 12px;
    width: calc(100vw - 24px);
    height: min(640px, calc(100dvh - 24px));
    min-height: 0;
  }

  .ai-guide__message {
    max-width: 92%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-guide__toggle {
    transition: none;
  }
}