/* ==========================================================================
   Modern Minimalist CSS for xcx.xyz
   High Performance, Zero Dependency, SEO & CWV Optimized
   ========================================================================== */

:root {
  --color-primary: #1f7cec;
  --color-primary-hover: #155bb5;
  --color-primary-light: #eef6ff;
  --color-accent: #f25f22;
  --color-accent-hover: #d94e16;
  --color-dark: #0a2540;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-card: #ffffff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.1), 0 4px 8px -2px rgba(0, 0, 0, 0.04);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --container-width: 1200px;
  --header-height: 70px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img, picture, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-normal);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-dark);
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
}

.site-brand img {
  height: 38px;
  width: auto;
}

.site-brand span {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-left: 1px solid var(--color-border);
  padding-left: 0.75rem;
  margin-left: 0.25rem;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-primary);
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-toggle-btn {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-text);
}

.nav-toggle-btn svg {
  width: 24px;
  height: 24px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(31, 124, 236, 0.3);
}

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

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(242, 95, 34, 0.3);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

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

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  background: radial-gradient(circle at top right, rgba(31, 124, 236, 0.08), transparent 60%),
              radial-gradient(circle at bottom left, rgba(242, 95, 34, 0.05), transparent 50%);
  border-bottom: 1px solid var(--color-border-light);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3.5rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2rem, 3.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-dark);
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-title .highlight {
  color: var(--color-primary);
  position: relative;
}

.hero-desc {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.stat-item h3 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.2;
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-visual img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-height: 480px;
  object-fit: cover;
  border: 1px solid var(--color-border);
}

/* ==========================================================================
   Section Common
   ========================================================================== */
.section {
  padding: 4.5rem 0;
}

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

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Services Cards
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.service-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(31, 124, 236, 0.3);
}

.service-card.is-featured {
  border-color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(31, 124, 236, 0.12);
}

.service-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

.service-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.service-icon svg {
  width: 28px;
  height: 28px;
}

.service-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 0.75rem;
}

.service-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.service-features {
  margin-bottom: 2rem;
}

.service-features li {
  font-size: 0.9rem;
  color: var(--color-text);
  padding: 0.45rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.service-features li svg {
  width: 18px;
  height: 18px;
  color: #10b981;
  flex-shrink: 0;
}

/* ==========================================================================
   Cases & Articles Grid
   ========================================================================== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.case-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(31, 124, 236, 0.3);
}

.case-media {
  position: relative;
  aspect-ratio: 16 / 10;
  background-color: var(--color-bg-alt);
  overflow: hidden;
}

.case-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.case-card:hover .case-media img {
  transform: scale(1.04);
}

.case-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background-color: rgba(10, 37, 64, 0.85);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  backdrop-filter: blur(4px);
}

.case-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.case-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}

.case-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.case-title a {
  color: inherit;
}

.case-title a:hover {
  color: var(--color-primary);
}

.case-excerpt {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.case-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-light);
  font-size: 0.85rem;
  font-weight: 600;
}

/* ==========================================================================
   Article Detail Page
   ========================================================================== */
.article-header {
  padding: 3rem 0 2rem;
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.breadcrumbs span.separator {
  color: var(--color-text-light);
}

.article-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.3;
  margin-bottom: 1.25rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 3.5rem;
  padding: 3.5rem 0;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
  word-wrap: break-word;
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-content ul, 
.article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content img {
  border-radius: var(--radius-md);
  margin: 1.5rem auto;
  box-shadow: var(--shadow-sm);
}

.article-content figure {
  margin: 1.5rem 0;
  text-align: center;
}

.article-content blockquote {
  border-left: 4px solid var(--color-primary);
  background-color: var(--color-primary-light);
  padding: 1rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  font-style: italic;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sidebar-widget {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.widget-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary);
}

.widget-list li {
  padding: 0.6rem 0;
  border-bottom: 1px dashed var(--color-border-light);
}

.widget-list li:last-child {
  border-bottom: none;
}

.widget-list a {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.4;
  display: block;
}

.widget-list a:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   CTA Banner
   ========================================================================== */
.cta-banner {
  background: linear-gradient(135deg, var(--color-dark) 0%, #153e6b 100%);
  color: #ffffff;
  padding: 4.5rem 0;
  border-radius: var(--radius-lg);
  text-align: center;
  margin: 2rem 0;
}

.cta-banner h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-banner p {
  font-size: 1.15rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* ==========================================================================
   Partners & Friendly Links
   ========================================================================== */
.partners-section {
  padding: 3rem 0;
  border-top: 1px solid var(--color-border);
}

.partners-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.partners-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

.partner-link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  background-color: var(--color-bg-alt);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-fast);
}

.partner-link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: #fff;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background-color: #0d1b2a;
  color: #e0e6ed;
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.footer-col p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #94a3b8;
  margin-bottom: 1rem;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: #94a3b8;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: #64748b;
}

.footer-bottom a {
  color: #94a3b8;
}

.footer-bottom a:hover {
  color: #ffffff;
}

/* ==========================================================================
   Native <dialog> Modal
   ========================================================================== */
dialog.site-modal {
  border: none;
  border-radius: var(--radius-lg);
  padding: 0;
  max-width: 520px;
  width: 90vw;
  box-shadow: var(--shadow-lg);
  background: #ffffff;
  margin: auto;
}

dialog.site-modal::backdrop {
  background-color: rgba(10, 37, 64, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-dark);
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-light);
  line-height: 1;
  padding: 0.25rem;
}

.modal-close-btn:hover {
  color: var(--color-dark);
}

.modal-body {
  padding: 2rem 1.5rem;
  text-align: center;
}

.modal-body img {
  margin: 0 auto 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  max-width: 200px;
}

.modal-body p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   Search Widget
   ========================================================================== */
.search-box {
  position: relative;
  max-width: 450px;
  margin: 0 auto 2rem;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1.25rem 0.75rem 2.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  font-size: 0.95rem;
  outline: none;
  background-color: #fff;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(31, 124, 236, 0.15);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--color-text-light);
  pointer-events: none;
}

.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  max-height: 360px;
  overflow-y: auto;
  z-index: 50;
  display: none;
}

.search-results.is-open {
  display: block;
}

.search-result-item {
  display: block;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
  text-decoration: none;
}

.search-result-item:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-primary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-desc {
    margin-inline: auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  
  .article-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ffffff;
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-top: 1px solid var(--color-border);
    overflow-y: auto;
  }
  
  .main-nav.is-open {
    display: flex;
  }
  
  .nav-toggle-btn {
    display: block;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-stats {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}