/* ============================================================
 * main.css —— 主样式（布局 + 组件 + 9 板块）
 * ============================================================ */

/* ========================================================
 * 通用：容器、文字、布局工具
 * ======================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-8) 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-6);
}

.section-header h2 {
  font-size: var(--fs-3xl);
  margin-bottom: var(--space-3);
}

.section-header p {
  font-size: var(--fs-lg);
  color: var(--color-gray-500);
}

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

/* ========================================================
 * 按钮
 * ======================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 24px;
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  line-height: 1;
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    transform var(--duration) var(--ease-out),
    box-shadow var(--duration) var(--ease-out),
    background var(--duration) var(--ease-out),
    color var(--duration) var(--ease-out);
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-primary-md);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.btn-primary > * { position: relative; z-index: 1; }
.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle 120px at var(--mx, -200px) var(--my, -200px),
    rgba(255, 255, 255, 0.35),
    rgba(255, 255, 255, 0) 60%
  );
  opacity: 0;
  transition: opacity 250ms var(--ease-out);
  pointer-events: none;
  z-index: 0;
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-lg);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary-600);
  border: 1px solid var(--color-primary-600);
}
.btn-ghost:hover {
  background: var(--color-primary-50);
}

.btn-outline {
  background: var(--color-white);
  color: var(--color-gray-700);
  border: 1px solid var(--color-gray-300);
}
.btn-outline:hover {
  border-color: var(--color-primary-600);
  color: var(--color-primary-600);
}

.btn-lg {
  padding: 16px 32px;
  font-size: var(--fs-lg);
}

.btn-block {
  width: 100%;
}

.btn:disabled,
.btn.is-loading {
  opacity: 0.7;
  cursor: not-allowed;
  pointer-events: none;
}

.btn .spinner {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: none;
}
.btn.is-loading .spinner {
  display: inline-block;
}

/* ========================================================
 * 滚动进度条
 * ======================================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--gradient-primary);
  z-index: calc(var(--z-sticky) + 1);
  pointer-events: none;
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.45);
  transition: width 80ms linear;
  will-change: width;
}

/* ========================================================
 * 顶部导航
 * ======================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0);
  transition: background var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out),
              backdrop-filter var(--duration) var(--ease-out);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-gray-900);
}
.brand svg,
.brand img {
  height: 32px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.nav-menu a {
  font-size: var(--fs-base);
  color: var(--color-gray-700);
  position: relative;
  padding: 8px 0;
  transition: color var(--duration);
}
.nav-menu a:hover {
  color: var(--color-primary-600);
}
.nav-menu a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: translateX(-50%);
  transition: width var(--duration) var(--ease-out);
}
.nav-menu a.is-active::after,
.nav-menu a:hover::after {
  width: 100%;
}
.nav-menu a.is-active {
  color: var(--color-primary-600);
  font-weight: var(--fw-medium);
}

.nav-cta {
  margin-left: auto;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-gray-900);
  transition: transform var(--duration), opacity var(--duration);
}
.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========================================================
 * Hero 首屏
 * ======================================================== */
.hero {
  position: relative;
  padding: calc(var(--header-height) + var(--space-8)) 0 var(--space-8);
  background: var(--gradient-hero-bg);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-7);
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-primary-100);
  margin-bottom: var(--space-4);
}

.hero-title {
  font-size: var(--fs-5xl);
  line-height: 1.15;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: var(--fs-lg);
  color: var(--color-gray-500);
  line-height: var(--line-height-loose);
  margin-bottom: var(--space-5);
  max-width: 540px;
}

.hero-cta {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.hero-meta {
  font-size: var(--fs-sm);
  color: var(--color-gray-500);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.hero-visual {
  position: relative;
}
.hero-visual img {
  width: 100%;
  filter: drop-shadow(0 20px 40px rgba(37, 99, 235, 0.15));
}

.hero-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}
.hero-decor::before,
.hero-decor::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}
.hero-decor::before {
  width: 400px;
  height: 400px;
  background: var(--color-primary-500);
  top: -100px;
  right: -100px;
}
.hero-decor::after {
  width: 300px;
  height: 300px;
  background: var(--color-accent);
  bottom: -50px;
  left: 30%;
}

/* ========================================================
 * 核心功能（6 卡片）
 * ======================================================== */
.features {
  background: var(--color-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.feature-card {
  padding: var(--space-5);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  transition:
    transform var(--duration) var(--ease-out),
    box-shadow var(--duration) var(--ease-out),
    border-color var(--duration) var(--ease-out);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-100);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary-soft);
  color: var(--color-primary-600);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
}
.feature-icon svg {
  width: 28px;
  height: 28px;
}

.feature-card h3 {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-2);
}

.feature-card p {
  font-size: var(--fs-base);
  color: var(--color-gray-500);
  line-height: var(--line-height-normal);
}

/* ========================================================
 * 数据亮点
 * ======================================================== */
.stats {
  background: var(--gradient-primary);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}
.stats::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1), transparent 50%),
    radial-gradient(circle at 80% 30%, rgba(255,255,255,0.08), transparent 50%);
  pointer-events: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
  position: relative;
  z-index: 2;
}

.stat {
  text-align: center;
}

.stat-number {
  font-size: var(--fs-5xl);
  font-weight: var(--fw-bold);
  line-height: 1;
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.stat-suffix {
  font-size: var(--fs-2xl);
  margin-left: 4px;
  vertical-align: top;
}

.stat-label {
  font-size: var(--fs-base);
  opacity: 0.9;
}

/* ========================================================
 * 应用场景（Tab）
 * ======================================================== */
.scenarios {
  background: var(--color-gray-50);
}

.tabs {
  max-width: 1080px;
  margin: 0 auto;
}

.tab-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.tab-btn {
  padding: 12px 24px;
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--color-gray-500);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-full);
  transition: all var(--duration) var(--ease-out);
}
.tab-btn:hover {
  color: var(--color-primary-600);
  border-color: var(--color-primary-300, var(--color-primary-500));
}
.tab-btn.active {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-color: transparent;
  box-shadow: var(--shadow-primary-md);
}

.tab-panels {
  position: relative;
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--shadow);
  min-height: 380px;
}

.tab-panel {
  display: none;
  opacity: 0;
  transition: opacity var(--duration) var(--ease-out);
}
.tab-panel.active {
  display: block;
  opacity: 1;
  animation: fadeIn var(--duration-slow) var(--ease-out);
}

.panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: center;
}

.panel-text h3 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-3);
  color: var(--color-primary-700);
}

.pain-points {
  margin-bottom: var(--space-4);
}
.pain-points li {
  position: relative;
  padding-left: 28px;
  margin-bottom: var(--space-2);
  font-size: var(--fs-base);
  color: var(--color-gray-700);
}
.pain-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 18px;
  height: 18px;
  background: var(--color-danger);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='currentColor'><path d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm5 13.59L15.59 17 12 13.41 8.41 17 7 15.59 10.59 12 7 8.41 8.41 7 12 10.59 15.59 7 17 8.41 13.41 12 17 15.59z'/></svg>") no-repeat center / contain;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='currentColor'><path d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm5 13.59L15.59 17 12 13.41 8.41 17 7 15.59 10.59 12 7 8.41 8.41 7 12 10.59 15.59 7 17 8.41 13.41 12 17 15.59z'/></svg>") no-repeat center / contain;
}

.solution {
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary-50);
  border-left: 3px solid var(--color-primary-600);
  border-radius: var(--radius);
  font-size: var(--fs-base);
  color: var(--color-gray-700);
}
.solution strong {
  color: var(--color-primary-700);
  display: block;
  margin-bottom: 4px;
}

.panel-image img {
  width: 100%;
  border-radius: var(--radius-lg);
}

/* ========================================================
 * 客户案例
 * ======================================================== */
.cases {
  background: var(--color-white);
}

.logo-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-7);
}

.logo-item {
  aspect-ratio: 2 / 1;
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-400);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  filter: grayscale(100%);
  opacity: 0.7;
  transition: all var(--duration) var(--ease-out);
}
.logo-item:hover {
  filter: grayscale(0);
  opacity: 1;
  color: var(--color-primary-600);
  border-color: var(--color-primary-100);
  background: var(--color-primary-50);
}

.case-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.case-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--duration) var(--ease-out);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.case-image {
  height: 180px;
  background: var(--gradient-primary-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-600);
  font-size: var(--fs-4xl);
  font-weight: var(--fw-bold);
}

.case-body {
  padding: var(--space-4);
}

.case-tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  font-size: var(--fs-xs);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
}

.case-body h3 {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-2);
}

.case-body p {
  color: var(--color-gray-500);
  font-size: var(--fs-base);
  margin-bottom: var(--space-3);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-primary-600);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  transition: gap var(--duration) var(--ease-out);
}
.link-arrow:hover {
  gap: 10px;
}

/* ========================================================
 * 客户推荐（轮播）
 * ======================================================== */
.testimonials {
  background: var(--color-gray-50);
}

.carousel {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow);
  padding: var(--space-6) var(--space-7);
  min-height: 320px;
}

.carousel-track {
  position: relative;
  min-height: 200px;
}

.carousel-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateX(20px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
  pointer-events: none;
}
.carousel-slide.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.quote {
  font-size: var(--fs-xl);
  line-height: var(--line-height-loose);
  color: var(--color-gray-700);
  margin-bottom: var(--space-4);
  position: relative;
  padding-left: var(--space-4);
}
.quote::before {
  content: "\201C";
  position: absolute;
  left: -4px;
  top: -20px;
  font-size: 80px;
  color: var(--color-primary-100);
  font-family: Georgia, serif;
  line-height: 1;
}

.quote-author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  flex-shrink: 0;
}

.author-name {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  color: var(--color-gray-900);
}
.author-meta {
  font-size: var(--fs-sm);
  color: var(--color-gray-500);
  margin-top: 2px;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  color: var(--color-gray-700);
  font-size: var(--fs-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  transition: all var(--duration) var(--ease-out);
}
.carousel-btn:hover {
  color: var(--color-primary-600);
  border-color: var(--color-primary-300, var(--color-primary-500));
  transform: translateY(-50%) scale(1.1);
}
.carousel-btn.prev { left: -22px; }
.carousel-btn.next { right: -22px; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-5);
}
.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-gray-300);
  transition: all var(--duration) var(--ease-out);
  cursor: pointer;
}
.carousel-dot.active {
  background: var(--color-primary-600);
  width: 24px;
  border-radius: var(--radius-full);
}

/* ========================================================
 * 联系我们
 * ======================================================== */
.contact {
  background: var(--color-white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-6);
  align-items: stretch;
}

.contact-form-wrap {
  padding: var(--space-6);
  background: var(--gradient-primary-soft);
  border-radius: var(--radius-2xl);
}

.contact-form-wrap h2 {
  font-size: var(--fs-3xl);
  margin-bottom: var(--space-2);
}
.contact-form-wrap > p {
  color: var(--color-gray-500);
  margin-bottom: var(--space-5);
}

.contact-form .field {
  margin-bottom: var(--space-3);
}

.contact-form label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-gray-700);
  margin-bottom: 6px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--fs-base);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius);
  transition: border-color var(--duration), box-shadow var(--duration);
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary-600);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.contact-form .field.has-error input,
.contact-form .field.has-error textarea {
  border-color: var(--color-danger);
}

.contact-form .error {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-xs);
  color: var(--color-danger);
  min-height: 16px;
}

.contact-info {
  padding: var(--space-6);
  background: var(--color-gray-50);
  border-radius: var(--radius-2xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.info-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  font-size: var(--fs-base);
  color: var(--color-gray-700);
  border-bottom: 1px solid var(--color-gray-200);
}
.info-item:last-of-type {
  border-bottom: 0;
}
.info-item .icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: var(--radius);
  background: var(--color-primary-50);
  color: var(--color-primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
}
.info-item strong {
  color: var(--color-gray-900);
  font-weight: var(--fw-semibold);
}

.qrcode {
  margin-top: var(--space-4);
  text-align: center;
}
.qrcode img {
  width: 140px;
  height: 140px;
  margin: 0 auto;
  border-radius: var(--radius);
  border: 1px solid var(--color-gray-200);
}
.qrcode p {
  margin-top: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--color-gray-500);
}

/* ========================================================
 * Footer
 * ======================================================== */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--space-7) 0 var(--space-4);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.footer-brand h3 {
  color: var(--color-white);
  font-size: var(--fs-xl);
  margin-bottom: var(--space-2);
}
.footer-brand p {
  color: var(--color-gray-400);
  font-size: var(--fs-sm);
  line-height: var(--line-height-normal);
}

.footer-col h4 {
  color: var(--color-white);
  font-size: var(--fs-base);
  margin-bottom: var(--space-3);
}
.footer-col ul li {
  margin-bottom: var(--space-2);
}
.footer-col a {
  color: var(--color-gray-400);
  font-size: var(--fs-sm);
  transition: color var(--duration);
}
.footer-col a:hover {
  color: var(--color-white);
}

.footer-bottom {
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--fs-sm);
  color: var(--color-gray-500);
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ========================================================
 * 返回顶部
 * ======================================================== */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: var(--color-white);
  font-size: var(--fs-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-primary-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--duration) var(--ease-out);
  z-index: var(--z-overlay);
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-lg);
}

/* ========================================================
 * Toast
 * ======================================================== */
.toast {
  position: fixed;
  top: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: 12px 24px;
  background: var(--color-gray-900);
  color: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  font-size: var(--fs-sm);
  opacity: 0;
  transition: all var(--duration) var(--ease-out);
  z-index: var(--z-toast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  max-width: 90vw;
}
.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.toast-success { background: var(--color-success); }
.toast.toast-error   { background: var(--color-danger); }

/* ========================================================
 * 响应式断点
 * ======================================================== */
@media (max-width: 1199px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .case-cards    { grid-template-columns: repeat(2, 1fr); }
  .logo-wall     { grid-template-columns: repeat(4, 1fr); }
  .footer-grid   { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-grid .footer-col:nth-child(4) { display: none; }
}

@media (max-width: 991px) {
  .hero-grid     { grid-template-columns: 1fr; }
  .hero-visual   { order: -1; max-width: 480px; margin: 0 auto; }
  .panel-grid    { grid-template-columns: 1fr; }
  .panel-image   { max-width: 480px; margin: 0 auto; }
  .contact-grid  { grid-template-columns: 1fr; }
  .stats-grid    { grid-template-columns: repeat(2, 1fr); row-gap: var(--space-5); }
}

@media (max-width: 767px) {
  .nav-toggle    { display: flex; }
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    gap: var(--space-3);
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    transition: transform var(--duration) var(--ease-out);
    border-top: 1px solid var(--color-gray-200);
  }
  .nav-menu.is-open { transform: translateY(0); }
  .nav-menu a { padding: 12px 0; text-align: center; }
  .nav-cta { display: none; }

  .features-grid { grid-template-columns: 1fr; }
  .case-cards    { grid-template-columns: 1fr; }
  .logo-wall     { grid-template-columns: repeat(2, 1fr); }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .footer-grid .footer-col:nth-child(4) { display: block; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .tab-panels { padding: var(--space-4); }
  .carousel { padding: var(--space-4); }
  .carousel-btn.prev { left: 8px; }
  .carousel-btn.next { right: 8px; }

  .hero-cta .btn { width: 100%; }
}