/* ============================================
   少数民族妇女手工艺传承平台 - 主样式表
   CSS前缀: sf- (ShouFu)
   设计风格: 民族刺绣非遗风
   ============================================ */

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

:root {
  --sf-primary: #2A52BE;
  --sf-primary-dark: #1E3D8F;
  --sf-primary-light: #4A72DE;
  --sf-accent: #C83232;
  --sf-accent-light: #E04545;
  --sf-white: #F5F5F5;
  --sf-bg: #FFFDF8;
  --sf-text: #2D2D2D;
  --sf-text-light: #5A5A5A;
  --sf-border: #E8DFD0;
  --sf-gold: #B8860B;
  --sf-shadow: 0 2px 12px rgba(42, 82, 190, 0.08);
  --sf-radius: 6px;
  --sf-font-title: "KaiTi", "STKaiti", "楷体", serif;
  --sf-font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--sf-font-body);
  color: var(--sf-text);
  background-color: var(--sf-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--sf-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--sf-font-title);
  color: var(--sf-primary-dark);
  line-height: 1.4;
  margin-bottom: 0.6em;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
  margin-bottom: 1em;
}

/* --- Container --- */
.sf-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* --- Navigation --- */
.sf-header {
  background: linear-gradient(180deg, #FFFDF5 0%, #FFF8EC 100%);
  border-bottom: 2px solid var(--sf-border);
  position: relative;
  z-index: 100;
}

.sf-nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.sf-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--sf-font-title);
  font-size: 1.1rem;
  color: var(--sf-primary-dark);
  font-weight: bold;
}

.sf-logo img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.sf-nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 5px;
}

.sf-nav-toggle span {
  display: block;
  width: 26px;
  height: 3px;
  background: var(--sf-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.sf-nav-toggle.sf-active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.sf-nav-toggle.sf-active span:nth-child(2) {
  opacity: 0;
}

.sf-nav-toggle.sf-active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

.sf-nav-menu {
  display: none;
  list-style: none;
  background: #FFFDF5;
  border-top: 1px solid var(--sf-border);
  padding: 0.5rem 0;
}

.sf-nav-menu.sf-open {
  display: block;
}

.sf-nav-menu li {
  border-bottom: 1px solid #F0EBE0;
}

.sf-nav-link {
  display: block;
  padding: 0.75rem 1.2rem;
  color: var(--sf-text);
  font-size: 0.95rem;
  transition: color 0.3s ease, background 0.3s ease;
}

.sf-nav-link:hover,
.sf-nav-link.sf-active {
  color: var(--sf-accent);
  background: rgba(200, 50, 50, 0.04);
}

.sf-nav-right {
  display: none;
}

.sf-search-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--sf-border);
  border-radius: var(--sf-radius);
  overflow: hidden;
  background: #fff;
}

.sf-search-box input {
  border: none;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  outline: none;
  width: 140px;
  font-family: var(--sf-font-body);
}

.sf-search-box button {
  background: var(--sf-primary);
  color: #fff;
  border: none;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 0.85rem;
}

.sf-btn-donate {
  display: inline-block;
  background: var(--sf-accent);
  color: #fff;
  padding: 0.4rem 1rem;
  border-radius: var(--sf-radius);
  font-size: 0.85rem;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease;
}

.sf-btn-donate:hover {
  background: var(--sf-accent-light);
  color: #fff;
}

/* --- Hero Banner / Carousel --- */
.sf-hero {
  position: relative;
  width: 100%;
  height: 60vh;
  min-height: 320px;
  overflow: hidden;
  background: var(--sf-primary-dark);
}

.sf-hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.sf-hero-slide.sf-active {
  opacity: 1;
}

.sf-hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sf-hero-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2rem 1.5rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: #fff;
}

.sf-hero-title {
  font-family: var(--sf-font-title);
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 0.4rem;
  text-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

.sf-hero-subtitle {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: 0.8rem;
}

.sf-hero-btn {
  display: inline-block;
  background: var(--sf-accent);
  color: #fff;
  padding: 0.5rem 1.5rem;
  border-radius: var(--sf-radius);
  font-size: 0.9rem;
  transition: background 0.3s ease;
}

.sf-hero-btn:hover {
  background: var(--sf-accent-light);
  color: #fff;
}

.sf-hero-dots {
  position: absolute;
  bottom: 1rem;
  right: 1.5rem;
  display: flex;
  gap: 8px;
}

.sf-hero-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: background 0.3s ease;
}

.sf-hero-dot.sf-active {
  background: var(--sf-accent);
}

/* --- Section Common --- */
.sf-section {
  padding: 2.5rem 0;
}

.sf-section-title {
  text-align: center;
  font-family: var(--sf-font-title);
  font-size: 1.5rem;
  color: var(--sf-primary-dark);
  margin-bottom: 0.3rem;
  position: relative;
}

.sf-section-subtitle {
  text-align: center;
  color: var(--sf-text-light);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.sf-section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--sf-primary), var(--sf-accent));
  margin: 0.5rem auto 1.5rem;
  border-radius: 2px;
}

/* --- Video Section --- */
.sf-video-section {
  background: linear-gradient(135deg, #F8F4EE 0%, #F0EBE0 100%);
}

.sf-video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}

.sf-video-card {
  position: relative;
  border-radius: var(--sf-radius);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--sf-shadow);
  transition: transform 0.3s ease;
}

.sf-video-card:hover {
  transform: translateY(-4px);
}

.sf-video-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.sf-video-play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background: rgba(42, 82, 190, 0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s ease;
}

.sf-video-play-icon::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}

.sf-video-card:hover .sf-video-play-icon {
  background: rgba(200, 50, 50, 0.9);
}

.sf-video-card-title {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.6rem 0.8rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: #fff;
  font-size: 0.85rem;
}

/* --- Video Modal --- */
.sf-modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.85);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.sf-modal-overlay.sf-show {
  display: flex;
}

.sf-modal-content {
  position: relative;
  width: 90%;
  max-width: 800px;
  background: #000;
  border-radius: var(--sf-radius);
  overflow: hidden;
}

.sf-modal-close {
  position: absolute;
  top: -36px;
  right: 0;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
  z-index: 10;
}

.sf-modal-content video {
  width: 100%;
  display: block;
}

/* --- Map Section --- */
.sf-map-section {
  background: #fff;
}

.sf-map-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  background: #F8F6F0;
  border-radius: var(--sf-radius);
  padding: 1.5rem;
  box-shadow: var(--sf-shadow);
}

.sf-map-svg {
  width: 100%;
  height: auto;
}

.sf-map-tooltip {
  display: none;
  position: absolute;
  background: var(--sf-primary);
  color: #fff;
  padding: 0.5rem 0.8rem;
  border-radius: var(--sf-radius);
  font-size: 0.8rem;
  pointer-events: none;
  z-index: 10;
  max-width: 200px;
}

.sf-map-legend {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.sf-map-legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--sf-text-light);
}

.sf-map-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* --- Works Gallery --- */
.sf-works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.sf-work-card {
  border-radius: var(--sf-radius);
  overflow: hidden;
  box-shadow: var(--sf-shadow);
  background: #fff;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.sf-work-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(42, 82, 190, 0.12);
}

.sf-work-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.sf-work-card-body {
  padding: 0.8rem;
}

.sf-work-card-title {
  font-family: var(--sf-font-title);
  font-size: 0.95rem;
  color: var(--sf-primary-dark);
  margin-bottom: 0.3rem;
}

.sf-work-card-desc {
  font-size: 0.8rem;
  color: var(--sf-text-light);
  line-height: 1.5;
}

/* --- Cloud School Entry --- */
.sf-cloud-entry {
  background: linear-gradient(135deg, var(--sf-primary) 0%, var(--sf-primary-dark) 100%);
  color: #fff;
  border-radius: var(--sf-radius);
  overflow: hidden;
  margin: 0 1rem;
}

.sf-cloud-entry-inner {
  display: flex;
  flex-direction: column;
}

.sf-cloud-entry img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.sf-cloud-entry-text {
  padding: 1.5rem;
}

.sf-cloud-entry-text h3 {
  color: #fff;
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.sf-cloud-entry-text p {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.sf-btn-learn {
  display: inline-block;
  background: var(--sf-accent);
  color: #fff;
  padding: 0.5rem 1.5rem;
  border-radius: var(--sf-radius);
  font-size: 0.9rem;
  transition: background 0.3s ease;
}

.sf-btn-learn:hover {
  background: var(--sf-accent-light);
  color: #fff;
}

/* --- News Section --- */
.sf-news-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.sf-news-item {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  background: #fff;
  border-radius: var(--sf-radius);
  box-shadow: var(--sf-shadow);
  transition: box-shadow 0.3s ease;
}

.sf-news-item:hover {
  box-shadow: 0 4px 16px rgba(42, 82, 190, 0.12);
}

.sf-news-date {
  flex-shrink: 0;
  text-align: center;
  background: var(--sf-primary);
  color: #fff;
  padding: 0.5rem;
  border-radius: var(--sf-radius);
  min-width: 60px;
}

.sf-news-date-day {
  font-size: 1.3rem;
  font-weight: bold;
  line-height: 1;
}

.sf-news-date-month {
  font-size: 0.7rem;
  margin-top: 2px;
}

.sf-news-content h4 {
  font-size: 0.95rem;
  color: var(--sf-primary-dark);
  margin-bottom: 0.3rem;
}

.sf-news-content p {
  font-size: 0.8rem;
  color: var(--sf-text-light);
  line-height: 1.5;
}

/* --- Recruit Section --- */
.sf-recruit-section {
  background: linear-gradient(135deg, #FFF8EC 0%, #F8F0E0 100%);
}

.sf-recruit-card {
  background: #fff;
  border-radius: var(--sf-radius);
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: var(--sf-shadow);
  border: 1px solid var(--sf-border);
}

.sf-recruit-card h3 {
  color: var(--sf-accent);
  margin-bottom: 0.5rem;
}

.sf-recruit-card p {
  color: var(--sf-text-light);
  font-size: 0.9rem;
  margin-bottom: 1.2rem;
}

.sf-btn-recruit {
  display: inline-block;
  background: var(--sf-gold);
  color: #fff;
  padding: 0.6rem 2rem;
  border-radius: var(--sf-radius);
  font-size: 0.9rem;
  transition: background 0.3s ease;
}

.sf-btn-recruit:hover {
  background: #9A7209;
  color: #fff;
}

/* --- Exhibition Section --- */
.sf-exhibition-banner {
  position: relative;
  border-radius: var(--sf-radius);
  overflow: hidden;
  margin: 0 1rem;
}

.sf-exhibition-banner img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.sf-exhibition-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.75));
  color: #fff;
}

.sf-exhibition-overlay h3 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.sf-exhibition-overlay p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.85);
}

/* --- Footer --- */
.sf-footer {
  background: linear-gradient(180deg, #1A1A2E 0%, #16213E 100%);
  color: rgba(255,255,255,0.8);
  padding: 2.5rem 0 0;
}

.sf-footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding-bottom: 2rem;
}

.sf-footer-col h4 {
  color: #fff;
  font-family: var(--sf-font-title);
  font-size: 1rem;
  margin-bottom: 0.8rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.sf-footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--sf-accent);
}

.sf-footer-col ul {
  list-style: none;
}

.sf-footer-col ul li {
  margin-bottom: 0.4rem;
}

.sf-footer-col ul li a {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  transition: color 0.3s ease;
}

.sf-footer-col ul li a:hover {
  color: var(--sf-accent);
}

.sf-footer-col p {
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(255,255,255,0.7);
}

/* --- Footer Honor Section --- */
.sf-footer-honors {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 1.5rem 0;
}

.sf-honor-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
}

.sf-honor-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.65);
}

.sf-honor-icon {
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}

/* --- Footer Bottom --- */
.sf-footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 1rem 0;
  text-align: center;
}

.sf-footer-bottom p {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.3rem;
}

.sf-auth-number {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.6);
  font-weight: bold;
}

/* --- Breadcrumb --- */
.sf-breadcrumb {
  padding: 0.8rem 0;
  font-size: 0.8rem;
  color: var(--sf-text-light);
}

.sf-breadcrumb a {
  color: var(--sf-text-light);
}

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

.sf-breadcrumb span {
  margin: 0 0.3rem;
}

/* --- Article Content --- */
.sf-article {
  background: #fff;
  border-radius: var(--sf-radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--sf-shadow);
}

.sf-article-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--sf-border);
}

.sf-article-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--sf-text-light);
  margin-top: 0.5rem;
}

.sf-article-body {
  font-size: 0.95rem;
  line-height: 2;
}

.sf-article-body p {
  margin-bottom: 1.2rem;
  text-indent: 2em;
}

.sf-article-body img {
  border-radius: var(--sf-radius);
  margin: 1.5rem auto;
  box-shadow: var(--sf-shadow);
}

.sf-article-body blockquote {
  border-left: 4px solid var(--sf-primary);
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
  background: #F8F6F0;
  border-radius: 0 var(--sf-radius) var(--sf-radius) 0;
  font-style: italic;
  color: var(--sf-text-light);
}

/* --- Course Cards (Cloud School) --- */
.sf-course-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.sf-filter-btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--sf-border);
  border-radius: 20px;
  background: #fff;
  color: var(--sf-text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: var(--sf-font-body);
}

.sf-filter-btn:hover,
.sf-filter-btn.sf-active {
  background: var(--sf-primary);
  color: #fff;
  border-color: var(--sf-primary);
}

.sf-course-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}

.sf-course-card {
  background: #fff;
  border-radius: var(--sf-radius);
  overflow: hidden;
  box-shadow: var(--sf-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}

.sf-course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(42, 82, 190, 0.12);
}

.sf-course-card img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}

.sf-course-card-body {
  padding: 0.8rem;
}

.sf-course-card-title {
  font-size: 0.95rem;
  font-weight: bold;
  color: var(--sf-primary-dark);
  margin-bottom: 0.3rem;
}

.sf-course-card-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--sf-text-light);
  margin-bottom: 0.3rem;
}

.sf-course-card-rating {
  color: var(--sf-gold);
  font-size: 0.8rem;
}

.sf-course-hover-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(42, 82, 190, 0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity 0.3s ease;
  color: #fff;
  text-align: center;
}

.sf-course-card:hover .sf-course-hover-overlay {
  opacity: 1;
}

.sf-course-hover-overlay p {
  font-size: 0.85rem;
  margin-bottom: 1rem;
  color: rgba(255,255,255,0.9);
}

.sf-btn-start {
  display: inline-block;
  background: var(--sf-accent);
  color: #fff;
  padding: 0.5rem 1.5rem;
  border-radius: var(--sf-radius);
  font-size: 0.9rem;
}

.sf-btn-start:hover {
  color: #fff;
}

/* --- App Download Page --- */
.sf-app-hero {
  background: linear-gradient(135deg, var(--sf-primary) 0%, var(--sf-primary-dark) 100%);
  color: #fff;
  padding: 3rem 1.5rem;
  text-align: center;
}

.sf-app-hero h2 {
  color: #fff;
}

.sf-app-mockup {
  max-width: 280px;
  margin: 1.5rem auto;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.sf-app-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  align-items: center;
  margin-top: 1.5rem;
}

.sf-app-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.15);
  color: #fff;
  padding: 0.7rem 1.5rem;
  border-radius: var(--sf-radius);
  border: 1px solid rgba(255,255,255,0.3);
  font-size: 0.9rem;
  transition: background 0.3s ease;
  min-width: 200px;
  justify-content: center;
}

.sf-app-btn:hover {
  background: rgba(255,255,255,0.25);
  color: #fff;
}

/* --- Page Banner --- */
.sf-page-banner {
  background: linear-gradient(135deg, var(--sf-primary) 0%, var(--sf-primary-dark) 100%);
  color: #fff;
  padding: 2.5rem 1.5rem;
  text-align: center;
}

.sf-page-banner h1 {
  color: #fff;
  font-size: 1.5rem;
  margin-bottom: 0.3rem;
}

.sf-page-banner p {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
}

/* --- Partners Section --- */
.sf-partners {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
  padding: 1rem 0;
}

.sf-partner-item {
  padding: 0.8rem 1.2rem;
  background: #fff;
  border-radius: var(--sf-radius);
  box-shadow: var(--sf-shadow);
  font-size: 0.8rem;
  color: var(--sf-text-light);
  text-align: center;
  min-width: 140px;
}

/* --- Lightbox --- */
.sf-lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.9);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.sf-lightbox.sf-show {
  display: flex;
}

.sf-lightbox img {
  max-width: 90%;
  max-height: 85vh;
  border-radius: var(--sf-radius);
}

.sf-lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
}

/* --- Utility --- */
.sf-text-center { text-align: center; }
.sf-mt-1 { margin-top: 0.5rem; }
.sf-mt-2 { margin-top: 1rem; }
.sf-mt-3 { margin-top: 1.5rem; }
.sf-mb-2 { margin-bottom: 1rem; }
.sf-mb-3 { margin-bottom: 1.5rem; }

/* ============================================
   Responsive Breakpoints (Mobile-First)
   320px (base) -> 768px -> 1024px -> 1440px
   ============================================ */

/* --- 768px: Tablet --- */
@media (min-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  
  .sf-hero {
    height: 70vh;
  }
  
  .sf-hero-title {
    font-size: 2rem;
  }
  
  .sf-nav-toggle {
    display: none;
  }
  
  .sf-nav-menu {
    display: flex !important;
    border-top: none;
    padding: 0;
    background: transparent;
    gap: 0;
  }
  
  .sf-nav-menu li {
    border-bottom: none;
  }
  
  .sf-nav-link {
    padding: 0.5rem 0.7rem;
    font-size: 0.85rem;
  }
  
  .sf-nav-right {
    display: flex;
    align-items: center;
    gap: 0.8rem;
  }
  
  .sf-video-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .sf-works-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .sf-news-list {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .sf-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .sf-honor-list {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .sf-course-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .sf-cloud-entry-inner {
    flex-direction: row;
  }
  
  .sf-cloud-entry img {
    width: 45%;
    aspect-ratio: auto;
  }
  
  .sf-app-buttons {
    flex-direction: row;
    justify-content: center;
  }
  
  .sf-map-legend {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- 1024px: Desktop --- */
@media (min-width: 1024px) {
  h1 { font-size: 2.25rem; }
  
  .sf-hero {
    height: 80vh;
  }
  
  .sf-hero-title {
    font-size: 2.5rem;
  }
  
  .sf-hero-subtitle {
    font-size: 1.05rem;
  }
  
  .sf-nav-link {
    padding: 0.5rem 0.9rem;
    font-size: 0.9rem;
  }
  
  .sf-footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .sf-course-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .sf-works-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .sf-page-banner {
    padding: 3.5rem 2rem;
  }
  
  .sf-page-banner h1 {
    font-size: 2rem;
  }
}

/* --- 1440px: Large Desktop --- */
@media (min-width: 1440px) {
  .sf-container {
    max-width: 1320px;
  }
  
  .sf-hero-title {
    font-size: 2.8rem;
  }
  
  .sf-map-legend {
    grid-template-columns: repeat(5, 1fr);
  }
}