/* Langyvents static demo styles (Phase 1) */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

:root {
  --lv-bg: #ffffff;
  --lv-surface: #ffffff;
  --lv-text: #161616;
  --lv-muted: #4b5563;
  --lv-border: rgba(22, 22, 22, 0.12);
  --lv-primary: #388e3c;
  --lv-secondary: #009cff;
  --lv-accent: #388e3c;
  --lv-shadow: 0 10px 28px rgba(0, 0, 0, 0.06);
  --lv-radius: 10px;
  --lv-radius-sm: 8px;
  --lv-maxw: 1220px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Poppins, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--lv-text);
  background: var(--lv-bg);
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(56, 142, 60, 0.35);
  outline-offset: 2px;
}

.langyvents-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.langyvents-container {
  max-width: var(--lv-maxw);
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

.langyvents-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: #ffffff;
  backdrop-filter: none;
  border-bottom: 1px solid var(--lv-border);
}

.langyvents-header__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
}

.langyvents-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0.2px;
}

.langyvents-brand__mark {
  display: none;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: var(--lv-primary);
}

.langyvents-brand__text {
  font-size: 30px;
  letter-spacing: 0;
}

.langyvents-header__nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.langyvents-header__nav a {
  padding: 10px 12px;
  border-radius: 999px;
  color: #212121;
  font-weight: 700;
  font-size: 16px;
}

.langyvents-header__nav a,
.langyvents-header__nav a:focus,
.langyvents-header__nav a:focus-visible {
  border: none;
  box-shadow: none;
  outline: none;
  background: transparent;
}

.langyvents-header__nav a[aria-current="page"] {
  color: var(--lv-primary);
  background: rgba(56, 142, 60, 0.12);
}

/* Dropdown nav (second level) using <details>/<summary> */
.langyvents-nav-dropdown {
  position: relative;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  margin: 0; /* 防止全局 details + details 产生额外 margin-top */
  box-shadow: none;
  display: flex;
  align-items: center;
}

.langyvents-nav-dropdown > summary {
  list-style: none;
  padding: 10px 12px;
  border-radius: 999px;
  color: #212121;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  user-select: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  line-height: 1.5;
  background: transparent;
  border: none;
  box-shadow: none;
  outline: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.langyvents-nav-dropdown > summary:focus,
.langyvents-nav-dropdown > summary:focus-visible {
  outline: none;
  box-shadow: none;
}

.langyvents-nav-dropdown > summary::-webkit-details-marker {
  display: none;
}

/* Custom caret (summary 默认标记被隐藏后用它补上) */
.langyvents-nav-dropdown > summary::after {
  content: "▾";
  font-size: 12px;
  color: currentColor;
  opacity: 0.9;
  transform: translateY(0);
  transition: transform 0.15s ease;
}

.langyvents-nav-dropdown[open] > summary::after {
  transform: translateY(0) rotate(180deg);
}

.langyvents-nav-dropdown[open] > summary {
  background: transparent;
  color: #212121;
}

.langyvents-nav-dropdown__panel {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 240px;
  background: #00245c;
  backdrop-filter: none;
  border: none;
  border-radius: 14px;
  padding: 10px;
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
  display: grid;
  gap: 4px;
  z-index: 50;
}

.langyvents-nav-dropdown__panel a {
  display: block;
  width: 100%;
  padding: 10px 12px;
  border-radius: 0;
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
  background: transparent;
  border: none;
  box-shadow: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.langyvents-nav-dropdown__panel a:hover {
  background: transparent;
  color: #ffffff;
}

/* Remove focus outline "border" feel on dropdown links */
.langyvents-nav-dropdown__panel a:focus-visible {
  outline: none;
}

/* Hover: 让二级 summary 像一级导航一样有反馈 */
.langyvents-header__nav a:hover,
.langyvents-nav-dropdown > summary:hover {
  background: rgba(56, 142, 60, 0.1);
  color: var(--lv-primary);
}

/* Hide dropdown panel when details is closed */
.langyvents-nav-dropdown:not([open]) .langyvents-nav-dropdown__panel {
  display: none;
}

.langyvents-header__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--lv-primary);
  color: #ffffff;
  font-weight: 700;
  white-space: nowrap;
}

.langyvents-header__menu-toggle {
  display: none;
  margin-left: auto;
  border: 1px solid var(--lv-border);
  background: #ffffff;
  border-radius: 12px;
  padding: 10px 12px;
  font-weight: 900;
  color: var(--lv-text);
}

.langyvents-main {
  flex: 1;
  padding: 24px 0 54px;
}

.langyvents-hero {
  background: linear-gradient(180deg, rgba(56, 142, 60, 0.12), rgba(0, 156, 255, 0.06));
  border: 1px solid var(--lv-border);
  border-radius: var(--lv-radius);
  min-height: clamp(560px, 88vh, 920px);
  padding: clamp(22px, 4vw, 60px);
  box-shadow: var(--lv-shadow);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(18px, 3vw, 44px);
  align-items: stretch;
}

.langyvents-hero h1 {
  margin: 0 0 10px;
  font-size: clamp(36px, 4.3vw, 60px);
  line-height: 1.12;
}

.langyvents-hero p {
  margin: 0 0 16px;
  color: var(--lv-muted);
  font-size: clamp(16px, 1.55vw, 20px);
}

.langyvents-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.langyvents-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: clamp(12px, 1.1vw, 16px) clamp(16px, 1.8vw, 22px);
  border-radius: 999px;
  font-weight: 900;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.08s ease;
}
.langyvents-btn:active {
  transform: translateY(1px);
}

.langyvents-btn--primary {
  background: var(--lv-primary);
  color: #ffffff;
}

.langyvents-btn--ghost {
  background: #ffffff;
  border-color: rgba(56, 142, 60, 0.35);
  color: var(--lv-primary);
}

.langyvents-hero__media img {
  width: 100%;
  height: 100%;
  max-height: none;
  object-fit: cover;
  display: block;
  border-radius: 18px;
  border: 1px solid var(--lv-border);
  background: rgba(255, 255, 255, 0.65);
}

.langyvents-hero__media {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.langyvents-section {
  margin-top: 26px;
}

.langyvents-section h2 {
  margin: 0 0 10px;
  font-size: 22px;
}

.langyvents-section p.lead {
  margin: 0 0 14px;
  color: var(--lv-muted);
}

.langyvents-core-benefits .langyvents-card {
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 26px 10px;
  text-align: center;
}

.langyvents-core-benefits .langyvents-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.langyvents-core-benefits .langyvents-card p {
  font-size: 14px;
  line-height: 1.65;
}

.langyvents-product-categories .langyvents-card {
  display: flex;
  flex-direction: column;
}

.langyvents-product__media {
  width: 100%;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--lv-border);
  background: rgba(255, 255, 255, 0.7);
  aspect-ratio: 16 / 10;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.langyvents-product__media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain; /* SVG 占位图尽量完整展示 */
}

.langyvents-product-categories .langyvents-card p {
  flex: 1; /* 让链接更稳定地在底部 */
}

.langyvents-product-categories .langyvents-card h3 {
  margin-top: 0; /* 图片在上方时避免额外偏移 */
}

.langyvents-featured .langyvents-card {
  display: flex;
  flex-direction: column;
}

.langyvents-featured__media {
  width: 100%;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--lv-border);
  background: rgba(255, 255, 255, 0.7);
  aspect-ratio: 16 / 9;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.langyvents-featured__media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
}

.langyvents-featured .langyvents-card p {
  flex: 1;
}

.langyvents-featured .langyvents-card h3 {
  margin-top: 0;
}

.langyvents-why .langyvents-card {
  text-align: center;
}

.langyvents-why__icon {
  width: 56px;
  height: 56px;
  border-radius: 999px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(56, 142, 60, 0.08);
  border: 1px solid rgba(56, 142, 60, 0.22);
  color: var(--lv-primary);
}

.langyvents-why__icon svg {
  width: 26px;
  height: 26px;
  display: block;
}

.langyvents-benefit__icon {
  width: 56px;
  height: 56px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  background: rgba(0, 156, 255, 0.08);
  border: 1px solid rgba(0, 156, 255, 0.18);
  color: var(--lv-secondary);
}

.langyvents-benefit__icon svg {
  width: 28px;
  height: 28px;
  display: block;
}

.langyvents-support .langyvents-card {
  text-align: center;
  display: flex;
  flex-direction: column;
}

.langyvents-support__icon {
  width: 56px;
  height: 56px;
  border-radius: 999px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 156, 255, 0.08);
  border: 1px solid rgba(0, 156, 255, 0.22);
  color: var(--lv-secondary);
}

.langyvents-support__icon svg {
  width: 26px;
  height: 26px;
  display: block;
}

.langyvents-support .langyvents-card h3 {
  margin-top: 0;
}

.langyvents-support .langyvents-card p {
  flex: 1;
}

.langyvents-muted {
  color: var(--lv-muted);
}

.langyvents-grid {
  display: grid;
  gap: 14px;
}
.langyvents-grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.langyvents-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.langyvents-grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.langyvents-card {
  background: var(--lv-surface);
  border: 1px solid var(--lv-border);
  border-radius: var(--lv-radius-sm);
  padding: 16px;
  box-shadow: 0 6px 20px rgba(2, 6, 23, 0.05);
}

.langyvents-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.langyvents-card p {
  margin: 0;
  color: var(--lv-muted);
}

.langyvents-card .langyvents-card__link {
  margin-top: 12px;
  display: inline-flex;
  font-weight: 900;
  color: var(--lv-accent);
}

details {
  background: var(--lv-surface);
  border: 1px solid var(--lv-border);
  border-radius: var(--lv-radius-sm);
  padding: 12px 14px;
  box-shadow: 0 6px 20px rgba(2, 6, 23, 0.04);
}

summary {
  cursor: pointer;
  font-weight: 900;
}

details + details {
  margin-top: 12px;
}

.langyvents-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.langyvents-roles .langyvents-card {
  display: flex;
  flex-direction: column;
  text-align: center;
}

.langyvents-split__media {
  width: 100%;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--lv-border);
  background: rgba(255, 255, 255, 0.7);
  aspect-ratio: 16 / 10;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.langyvents-split__media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
}

form {
  display: grid;
  gap: 12px;
}

.langyvents-field {
  display: grid;
  gap: 6px;
}

.langyvents-field label {
  font-weight: 900;
  font-size: 14px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--lv-border);
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 15px;
  background: var(--lv-surface);
}

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

.langyvents-footer {
  border-top: 1px solid var(--lv-border);
  background: rgba(255, 255, 255, 0.65);
}

.langyvents-footer__inner {
  padding: 22px 0;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 16px;
}

.langyvents-footer__links {
  display: grid;
  gap: 10px;
  align-content: start;
}

.langyvents-footer__links a {
  color: var(--lv-muted);
  font-weight: 700;
}

@media (max-width: 900px) {
  .langyvents-header__nav {
    display: none;
  }
  .langyvents-header__menu-toggle {
    display: inline-flex;
  }
  .langyvents-header__nav.langyvents-is-open {
    display: flex;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    margin-left: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 12px 20px 18px;
    background: rgba(246, 251, 251, 0.98);
    border-bottom: 1px solid var(--lv-border);
  }
  .langyvents-header__nav a {
    width: 100%;
    padding: 12px 10px;
    border-radius: 12px;
    margin: 2px 0;
    background: transparent;
  }

  .langyvents-nav-dropdown > summary {
    width: 100%;
    padding: 12px 10px;
    border-radius: 12px;
    margin: 2px 0;
    background: transparent;
  }

  .langyvents-nav-dropdown__panel {
    position: static;
    top: auto;
    left: auto;
    min-width: auto;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    gap: 0;
  }

  /* On mobile the dropdown panel should flow in the column */
  .langyvents-nav-dropdown:not([open]) .langyvents-nav-dropdown__panel {
    display: none;
  }

  .langyvents-nav-dropdown__panel a {
    width: 100%;
    padding: 10px 12px;
    border-radius: 12px;
    margin: 2px 0;
    background: transparent;
  }
  .langyvents-hero {
    grid-template-columns: 1fr;
    min-height: clamp(480px, 78vh, 820px);
  }
  .langyvents-footer__inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
  .langyvents-grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .langyvents-grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .langyvents-hero {
    padding: 18px;
    min-height: auto;
  }
  .langyvents-hero h1 {
    font-size: 30px;
  }
  .langyvents-grid--2,
  .langyvents-grid--3,
  .langyvents-grid--4 {
    grid-template-columns: 1fr;
  }
  .langyvents-split {
    grid-template-columns: 1fr;
  }

  .langyvents-hero__media {
    height: auto;
  }

  .langyvents-hero__media img {
    height: auto;
    object-fit: contain;
  }
}