/* ============================================
   Doodlejay - Components
   Reusable UI components
   ============================================ */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* Section */
.section {
  padding-top: var(--space-20);
  padding-bottom: var(--space-20);
  position: relative;
}

.section--lg {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
}

.section--dark {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

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

.section--gradient {
  background: var(--gradient-mesh);
  background-color: var(--color-bg-darker);
  color: var(--color-text-inverse);
}

.section__head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--space-16);
}

.section__eyebrow {
  display: inline-block;
  padding: 6px 16px;
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-200);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.section--dark .section__eyebrow,
.section--gradient .section__eyebrow {
  color: var(--color-primary-300);
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
}

.section__title {
  font-size: var(--fs-5xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-primary-700) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.section--dark .section__title,
.section--gradient .section__title {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.section__subtitle {
  font-size: var(--fs-lg);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.section--dark .section__subtitle,
.section--gradient .section__subtitle {
  color: var(--color-gray-300);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 14px 32px;
  font-size: var(--fs-base);
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.5), 0 0 24px rgba(59, 130, 246, 0.3);
}

.btn--primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.6s var(--ease-out);
}

.btn--primary:hover::after {
  left: 100%;
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-50);
  transform: translateY(-2px);
}

.section--dark .btn--ghost,
.section--gradient .btn--ghost {
  color: var(--color-text-inverse);
  border-color: rgba(255, 255, 255, 0.2);
}

.section--dark .btn--ghost:hover,
.section--gradient .btn--ghost:hover {
  border-color: var(--color-primary-300);
  color: var(--color-primary-300);
  background: rgba(59, 130, 246, 0.1);
}

.btn--light {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(12px);
}

.btn--light:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 10px 20px;
  font-size: var(--fs-sm);
}

.btn--lg {
  padding: 18px 40px;
  font-size: var(--fs-lg);
}

.btn__icon {
  width: 18px;
  height: 18px;
  transition: transform var(--duration) var(--ease-out);
}

.btn:hover .btn__icon {
  transform: translateX(4px);
}

/* Card */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  transition: all var(--duration) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-200);
}

.card--glass {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  color: var(--color-text-inverse);
}

.card--glass:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(96, 165, 250, 0.4);
  transform: translateY(-6px);
}

.card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--color-primary-50);
  color: var(--color-primary);
  margin-bottom: var(--space-5);
  transition: all var(--duration) var(--ease-out);
}

.card--glass .card__icon {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-300);
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.card:hover .card__icon {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.05) rotate(-4deg);
}

.card--glass:hover .card__icon {
  background: var(--color-primary-500);
  color: #fff;
}

.card__icon svg {
  width: 28px;
  height: 28px;
}

.card__title {
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: inherit;
}

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

.card--glass .card__text {
  color: var(--color-gray-300);
}

.card__list {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.card__tag {
  font-size: var(--fs-xs);
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  border: 1px solid var(--color-primary-100);
}

.card--glass .card__tag {
  background: rgba(96, 165, 250, 0.12);
  color: var(--color-primary-200);
  border-color: rgba(96, 165, 250, 0.25);
}

/* Header / Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
  transition: all var(--duration) var(--ease-out);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.site-header__logo {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--gradient-primary);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
  color: #fff;
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.site-header__logo-img {
  height: 40px;
  width: auto;
  display: block;
  filter: drop-shadow(0 4px 12px rgba(59, 130, 246, 0.18));
  transition: transform var(--duration) var(--ease-out);
}

.site-header__brand:hover .site-header__logo-img {
  transform: scale(1.04);
}

.site-header__title {
  font-size: var(--fs-lg);
  font-weight: 700;
  line-height: 1.1;
}

.site-header__title small {
  display: block;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius);
  transition: color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
}

.nav__link:hover {
  color: var(--color-primary);
  background: var(--color-primary-50);
}

.nav__link.is-active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav__link.is-active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 18px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

.nav__cta {
  margin-left: var(--space-4);
}

/* Language switcher */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: var(--color-gray-100);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: 600;
  margin-left: var(--space-3);
}

.lang-switch__btn {
  padding: 6px 12px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  background: transparent;
  transition: all var(--duration-fast) var(--ease-out);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.lang-switch__btn:hover {
  color: var(--color-text);
}

.lang-switch__btn.is-active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.lang-switch__btn--cn { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; }
.lang-switch__btn--en { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; }

@media (max-width: 720px) {
  .lang-switch { margin-left: 0; margin-top: var(--space-3); align-self: flex-start; }
}

.site-header.is-scrolled .lang-switch {
  background: var(--color-gray-50);
}

.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: var(--color-gray-100);
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}

.nav__toggle svg {
  width: 22px;
  height: 22px;
}

@media (max-width: 960px) {
  .nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    transform: translateX(100%);
    transition: transform var(--duration) var(--ease-out);
    overflow-y: auto;
  }
  .nav.is-open {
    transform: translateX(0);
  }
  .nav__link {
    padding: 14px 16px;
    font-size: var(--fs-base);
    border-radius: var(--radius);
  }
  .nav__link.is-active::after { display: none; }
  .nav__cta {
    margin-left: 0;
    margin-top: var(--space-4);
  }
  .nav__toggle {
    display: inline-flex;
  }
}

/* Footer */
.site-footer {
  background: var(--color-bg-darker);
  color: var(--color-gray-300);
  padding: var(--space-20) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary-500), transparent);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

@media (max-width: 900px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 540px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
  }
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.site-footer__brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 18px;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.site-footer__brand-name {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: #fff;
  line-height: 1.1;
}

.site-footer__brand-name small {
  display: block;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-gray-400);
  text-transform: uppercase;
}

.site-footer__about {
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--color-gray-400);
  max-width: 360px;
  margin-bottom: var(--space-5);
}

.site-footer__bilingual {
  font-size: var(--fs-xs);
  color: var(--color-gray-500);
  border-top: 1px solid var(--color-gray-800);
  padding-top: var(--space-4);
  line-height: 1.7;
}

.site-footer__col-title {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-5);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.site-footer__list a {
  font-size: var(--fs-sm);
  color: var(--color-gray-400);
  transition: color var(--duration-fast) var(--ease-out);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.site-footer__list a:hover {
  color: var(--color-primary-300);
}

.site-footer__contact-item {
  font-size: var(--fs-sm);
  color: var(--color-gray-400);
  line-height: 1.6;
}

.site-footer__contact-item strong {
  display: block;
  color: var(--color-gray-200);
  font-weight: 500;
  margin-bottom: 2px;
  font-size: var(--fs-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.site-footer__contact-item a:hover {
  color: var(--color-primary-300);
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-gray-800);
  font-size: var(--fs-xs);
  color: var(--color-gray-500);
}

.site-footer__bottom-links {
  display: flex;
  gap: var(--space-5);
  flex-wrap: wrap;
}

/* ICP filing (网站备案) row */
.site-footer__beian-row {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
  padding-top: var(--space-5);
  margin-top: var(--space-1);
  border-top: 1px dashed var(--color-gray-800);
  font-size: var(--fs-xs);
}

.site-footer__beian {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
  line-height: 1.4;
}

.site-footer__beian:hover {
  color: var(--color-primary-300);
}

.site-footer__beian-icon {
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
  color: var(--color-primary-400);
  opacity: 0.85;
}

@media (max-width: 540px) {
  .site-footer__beian-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}

.site-footer__bottom-links a:hover {
  color: var(--color-primary-300);
}

/* Grid utilities */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
}

/* Stat */
.stat {
  text-align: center;
  padding: var(--space-6);
}

.stat__num {
  display: block;
  font-size: var(--fs-5xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat--inverse .stat__num {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat__label {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.stat--inverse .stat__label {
  color: var(--color-gray-400);
}

/* Page header (for subpages) */
.page-header {
  padding-top: calc(var(--nav-height) + var(--space-20));
  padding-bottom: var(--space-16);
  background: var(--gradient-cool);
  color: var(--color-text-inverse);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(59, 130, 246, 0.25), transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(96, 165, 250, 0.2), transparent 60%);
  z-index: 0;
}

.page-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
}

.page-header__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.page-header__breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--color-primary-300);
  margin-bottom: var(--space-5);
}

.page-header__breadcrumb a:hover {
  color: var(--color-primary-200);
}

.page-header__breadcrumb svg {
  width: 14px;
  height: 14px;
}

.page-header__title {
  font-size: var(--fs-6xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-bottom: var(--space-4);
}

.page-header__subtitle {
  font-size: var(--fs-lg);
  color: var(--color-gray-300);
  line-height: 1.7;
}

/* Bilingual label */
.bilingual {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.bilingual__cn {
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: none;
  font-size: var(--fs-sm);
}

.bilingual__divider {
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: 0.4;
}

.section--dark .bilingual,
.section--gradient .bilingual {
  color: var(--color-gray-400);
}