/* ============================================
   components.css — Mercury Components for 海广商城
   BEM naming: block__element--modifier
   ============================================ */

/* ── Reset & Base ── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: var(--weight-normal);
  line-height: var(--leading-normal);
  color: var(--color-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-normal) var(--ease-mercury);
}

a:hover {
  color: var(--color-accent-hover);
}

/* ── Layout ── */
.layout__container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.layout__container--wide {
  max-width: var(--max-width);
}

.layout__section {
  padding-block: var(--space-16);
}

.layout__section--alt {
  background-color: var(--color-bg-alt);
}

/* ── Craft Banner ── */
.craft-banner {
  padding: var(--space-4) 0;
  background-color: var(--color-bg);
  overflow: hidden;
}

.craft-banner__inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.craft-banner__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
  display: block;
}

@media (max-width: 640px) {
  .craft-banner__inner {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
}

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: rgba(252, 252, 250, 0.85);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-low);
  transition: background var(--duration-normal) var(--ease-mercury);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.nav__brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.nav__links {
  display: none;
  list-style: none;
  gap: var(--space-8);
  align-items: center;
}

.nav__link {
  font-size: var(--text-small);
  font-weight: var(--weight-normal);
  color: var(--color-secondary);
  transition: color var(--duration-normal) var(--ease-mercury);
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.nav__toggle__bar {
  width: 22px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--duration-normal) var(--ease-mercury),
              opacity var(--duration-normal) var(--ease-mercury);
}

/* Mobile menu */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  padding: var(--space-10) var(--gutter);
  z-index: 99;
}

.nav__mobile--open {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.nav__mobile__link {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: var(--weight-medium);
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }

  .nav__toggle {
    display: none;
  }
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: var(--weight-medium);
  line-height: 1;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-mercury);
  white-space: nowrap;
}

.btn--solid {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.btn--solid:hover {
  background-color: var(--color-accent-hover);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(82, 102, 235, 0.3);
}

.btn--glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  color: var(--color-primary);
  border: 1px solid rgba(42, 41, 36, 0.08);
}

.btn--glass:hover {
  background: rgba(112, 115, 147, 0.18);
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid rgba(82, 102, 235, 0.3);
}

.btn--ghost:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent);
}

.btn--lg {
  height: 48px;
  padding: 0 var(--space-8);
  font-size: var(--text-body);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: var(--nav-height);
  background: var(--gradient-hero);
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../assets/images/hero-bg.jpg') center/cover no-repeat;
  opacity: 0.08;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__content.fade-up {
  max-width: 720px;
  padding: var(--space-10) var(--gutter);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  margin-bottom: var(--space-8);
  font-size: var(--text-small);
  font-weight: var(--weight-medium);
  color: var(--color-secondary);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-radius: var(--radius-pill);
  border: 1px solid rgba(42, 41, 36, 0.06);
}

.hero__title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-tight);
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.hero__subtitle {
  font-size: var(--text-body-lg);
  color: var(--color-secondary);
  line-height: var(--leading-snug);
  margin-bottom: var(--space-10);
  max-width: 560px;
  margin-inline: auto;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Section Header ── */
.section-header {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: var(--space-12);
}

.section-header__label {
  font-size: var(--text-small);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}

.section-header__title {
  font-family: var(--font-heading);
  font-size: var(--text-h2);
  font-weight: var(--weight-heading);
  line-height: var(--leading-snug);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.section-header__desc {
  font-size: var(--text-body-lg);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
}

/* ── Product Card Grid ── */
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.product-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-medium);
  overflow: hidden;
  transition: transform var(--duration-normal) var(--ease-mercury),
              box-shadow var(--duration-normal) var(--ease-mercury);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-high);
}

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

.product-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0, 0, 0.2, 1);
}

.product-card:hover .product-card__image img {
  transform: scale(1.05);
}

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

.product-card__tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-caption);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  background: var(--color-accent-light);
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-3);
}

.product-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.product-card__desc {
  font-size: var(--text-small);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
}

/* ── Compare (订购方式) ── */
.compare {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .compare {
    grid-template-columns: repeat(2, 1fr);
  }
}

.compare__card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-medium);
  position: relative;
  overflow: hidden;
}

.compare__card--featured {
  border: 2px solid var(--color-accent);
}

.compare__card--featured::before {
  content: '热门';
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-caption);
  font-weight: var(--weight-medium);
  color: #FFFFFF;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
}

.compare__title {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.compare__desc {
  font-size: var(--text-body);
  color: var(--color-secondary);
  margin-bottom: var(--space-6);
  line-height: var(--leading-normal);
}

.compare__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.compare__list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-small);
  color: var(--color-primary);
  line-height: var(--leading-normal);
}

.compare__list__item::before {
  content: '✓';
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  background: var(--color-accent-light);
  border-radius: 50%;
}

/* ── Trust (安全保障) ── */
.trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .trust-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.trust-item {
  text-align: center;
  padding: var(--space-8) var(--space-4);
}

.trust-item__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-5);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  border-radius: var(--radius-md);
  font-size: 1.5rem;
}

.trust-item__title {
  font-family: var(--font-heading);
  font-size: var(--text-body);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.trust-item__desc {
  font-size: var(--text-small);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
}

/* ── Steps (使用指南) ── */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  counter-reset: step;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
  }
}

.step {
  position: relative;
  counter-increment: step;
  padding: var(--space-6);
  background: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-low);
}

.step__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-bottom: var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-body);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  background: var(--color-accent-light);
  border-radius: 50%;
}

.step__title {
  font-family: var(--font-heading);
  font-size: var(--text-body);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.step__desc {
  font-size: var(--text-small);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
}

/* ── About ── */
.about__content {
  max-width: 720px;
  margin-inline: auto;
  text-align: center;
}

.about__visual {
  margin-bottom: var(--space-8);
}

.about__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.about__text {
  font-size: var(--text-body-lg);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-6);
}

.about__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  justify-content: center;
}

.about__meta__item {
  text-align: center;
}

.about__meta__value {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}

.about__meta__label {
  font-size: var(--text-small);
  color: var(--color-secondary);
}

/* ── FAQ ── */
.faq-list {
  max-width: 720px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.faq-item {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  background: var(--color-card);
  border: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: var(--text-body);
  font-weight: var(--weight-medium);
  color: var(--color-primary);
  text-align: left;
  transition: background var(--duration-normal) var(--ease-mercury);
}

.faq-item__question:hover {
  background: var(--color-bg-alt);
}

.faq-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-secondary);
  transition: transform var(--duration-normal) var(--ease-mercury);
}

.faq-item--open .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-macro) var(--ease-mercury);
}

.faq-item--open .faq-item__answer {
  max-height: 300px;
}

.faq-item__answer__inner {
  padding: 0 var(--space-6) var(--space-5);
  font-size: var(--text-small);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
}

/* ── Footer ── */
.footer {
  background-color: var(--color-primary);
  color: rgba(252, 252, 250, 0.7);
  padding-block: var(--space-12) var(--space-8);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .footer__inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer__brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: var(--weight-heading);
  color: var(--color-bg);
  margin-bottom: var(--space-3);
}

.footer__desc {
  font-size: var(--text-small);
  line-height: var(--leading-normal);
  max-width: 320px;
}

.footer__heading {
  font-family: var(--font-heading);
  font-size: var(--text-small);
  font-weight: var(--weight-heading);
  color: var(--color-bg);
  margin-bottom: var(--space-4);
}

.footer__link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__link {
  font-size: var(--text-small);
  color: rgba(252, 252, 250, 0.6);
  transition: color var(--duration-normal) var(--ease-mercury);
}

.footer__link:hover {
  color: var(--color-bg);
}

.footer__bottom {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(252, 252, 250, 0.1);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  font-size: var(--text-caption);
  color: rgba(252, 252, 250, 0.4);
}

/* ── Modal (Privacy / Terms) ── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: var(--gutter);
}

.modal-overlay--open {
  display: flex;
}

.modal {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  padding: var(--space-8);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.modal__title {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}

.modal__close {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--color-secondary);
  padding: var(--space-2);
}

.modal__body {
  font-size: var(--text-small);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
}

.modal__body h3 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.modal__body p {
  margin-bottom: var(--space-4);
}

/* ── Fade-up Animation ── */
@media (prefers-reduced-motion: no-preference) {
  .fade-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--duration-macro) var(--ease-mercury),
                transform var(--duration-macro) var(--ease-mercury);
  }

  .fade-up--visible {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
  }
}

/* ── About Intro (company profile split layout) ── */
.about-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
  margin-bottom: var(--space-10);
}

@media (min-width: 768px) {
  .about-intro {
    grid-template-columns: 240px 1fr;
    gap: var(--space-12);
  }
}

.about-intro__logo {
  display: flex;
  justify-content: center;
}

.about-intro__logo img {
  max-width: 200px;
  height: auto;
}

.about-intro__text p {
  font-size: var(--text-body-lg);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-4);
}

.about-intro__text p:last-child {
  margin-bottom: 0;
}

.about-intro__team {
  margin-top: var(--space-4);
}

.about-intro__team img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

/* ── News List ── */
.news-list {
  max-width: 860px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.news-item {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-5) var(--space-6);
  background: var(--color-card);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--duration-normal) var(--ease-mercury),
              transform var(--duration-normal) var(--ease-mercury);
}

.news-item:hover {
  background: var(--color-bg-alt);
  transform: translateX(4px);
  color: inherit;
}

.news-item__date {
  flex-shrink: 0;
  font-family: var(--font-heading);
  font-size: var(--text-small);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  min-width: 80px;
}

.news-item__content {
  flex: 1;
  min-width: 0;
}

.news-item__title {
  font-family: var(--font-heading);
  font-size: var(--text-body);
  font-weight: var(--weight-medium);
  color: var(--color-primary);
  margin-bottom: var(--space-1);
  line-height: var(--leading-snug);
}

.news-item__desc {
  font-size: var(--text-small);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-item__arrow {
  flex-shrink: 0;
  font-size: 1.25rem;
  color: var(--color-secondary);
  transition: color var(--duration-normal) var(--ease-mercury),
              transform var(--duration-normal) var(--ease-mercury);
}

.news-item:hover .news-item__arrow {
  color: var(--color-accent);
  transform: translateX(2px);
}

@media (max-width: 640px) {
  .news-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .news-item__arrow {
    display: none;
  }
}

/* ── Section CTA ── */
.section-cta {
  text-align: center;
  margin-top: var(--space-10);
}

/* ── Footer Contact ── */
.footer__contact {
  margin-top: var(--space-4);
  font-size: var(--text-small);
  line-height: var(--leading-normal);
}

.footer__contact p {
  margin-bottom: var(--space-1);
}

/* ── Utility ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}