/* ============================================================
   Kevin · Components（Navbar / Hero / 按钮 / 卡片 / Footer 等）
   ============================================================ */

/* ================= Navbar ================= */
.kv-navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--kevin-border);
  height: var(--kevin-navbar-h);
}
.kv-navbar__inner {
  height: var(--kevin-navbar-h);
  display: flex;
  align-items: center;
  gap: 28px;
}
.kv-navbar__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.kv-navbar__logo img {
  height: 40px;
  width: auto;
  display: block;
}
.kv-navbar__menu {
  display: flex;
  align-items: center;
  gap: 26px;
  flex: 1;
  justify-content: center;
}
.kv-navbar__menu a {
  font-size: 15px;
  font-weight: 500;
  color: var(--kevin-text);
  padding: 6px 2px;
  position: relative;
  transition: color 0.2s;
  white-space: nowrap;
}
.kv-navbar__menu a:hover { color: var(--kevin-primary); }
.kv-navbar__menu a.active {
  color: var(--kevin-primary);
  font-weight: 600;
}
.kv-navbar__menu a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -4px;
  width: 20px;
  height: 3px;
  border-radius: 3px;
  background: var(--kevin-primary);
}
.kv-navbar__right {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
/* 汉堡按钮（移动端） */
.kv-navbar__burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.kv-navbar__burger svg { display: block; }

/* 移动端抽屉菜单 */
.kv-mobile-menu {
  position: fixed;
  inset: var(--kevin-navbar-h) 0 auto 0;
  background: var(--kevin-white);
  border-bottom: 1px solid var(--kevin-border);
  box-shadow: var(--kevin-shadow-lg);
  padding: 20px 24px 28px;
  z-index: 99;
  display: none;
}
.kv-mobile-menu.open { display: block; }
.kv-mobile-menu a {
  display: block;
  padding: 14px 8px;
  font-size: 16px;
  font-weight: 500;
  color: var(--kevin-text);
  border-bottom: 1px solid var(--kevin-bg);
}
.kv-mobile-menu a.active { color: var(--kevin-primary); }
.kv-mobile-menu .kv-btn { margin-top: 16px; width: 100%; }

/* ================= 按钮 ================= */
.kv-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--kevin-radius-round);
  font-size: 15px;
  font-weight: 600;
  font-family: var(--kevin-font-cn);
  cursor: pointer;
  border: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  white-space: nowrap;
}
.kv-btn:active { transform: scale(0.97); }
.kv-btn--primary {
  background: var(--kevin-gradient-btn);
  color: #fff;
  box-shadow: 0 8px 20px rgba(108, 85, 245, 0.35);
}
.kv-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(108, 85, 245, 0.45);
}
.kv-btn--white {
  background: #fff;
  color: var(--kevin-primary);
  box-shadow: 0 8px 20px rgba(36, 52, 91, 0.15);
}
.kv-btn--white:hover { transform: translateY(-2px); }
.kv-btn--outline {
  background: transparent;
  color: var(--kevin-primary);
  border: 1.5px solid var(--kevin-primary);
}
.kv-btn--outline:hover { background: rgba(108, 85, 245, 0.08); }
.kv-btn--sm { padding: 9px 20px; font-size: 14px; }
.kv-btn--lg { padding: 16px 36px; font-size: 16px; }
.kv-btn[disabled] { opacity: 0.6; cursor: not-allowed; }

/* ================= Hero ================= */
.kv-hero {
  position: relative;
  background: var(--kevin-gradient-hero);
  overflow: hidden;
  min-height: 560px;
}
.kv-hero__inner {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 24px;
  padding: 72px 24px 120px;
  max-width: var(--kevin-container);
  margin: 0 auto;
}
.kv-hero__title {
  font-size: 52px;
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
  margin: 0 0 18px;
  letter-spacing: 1px;
  text-shadow: 0 4px 24px rgba(36, 52, 91, 0.25);
}
.kv-hero__title .kv-hl-star { color: var(--kevin-yellow); }
.kv-hero__en {
  font-family: var(--kevin-font-en);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 4px;
  color: rgba(255, 255, 255, 0.85);
  margin: 0 0 14px;
}
.kv-hero__sub {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.9);
  margin: 0 0 34px;
}
.kv-hero__cta { display: flex; gap: 16px; flex-wrap: wrap; }
.kv-hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-end;
}
.kv-hero__visual img.kv-hero__mascot {
  width: 380px;
  max-width: 100%;
  filter: drop-shadow(0 18px 32px rgba(36, 52, 91, 0.35));
  animation: kv-float 4.5s ease-in-out infinite;
  position: relative;
  z-index: 2;
}
.kv-hero__slogan {
  position: absolute;
  right: 2%;
  top: 8%;
  z-index: 5;
  color: var(--kevin-yellow);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.6;
  text-align: right;
  text-shadow: 0 2px 12px rgba(36, 52, 91, 0.45);
  transform: rotate(3deg);
  pointer-events: none;
}
.kv-hero__slogan small {
  display: block;
  color: rgba(255, 255, 255, 0.85);
  font-size: 13px;
  font-weight: 500;
}

/* Hero 装饰：星星 / 星球 / 云 */
.kv-star {
  position: absolute;
  z-index: 1;
  background: var(--kevin-yellow);
  clip-path: polygon(50% 0%, 63% 37%, 100% 50%, 63% 63%, 50% 100%, 37% 63%, 0% 50%, 37% 37%);
  animation: kv-twinkle 2.6s ease-in-out infinite;
}
.kv-planet {
  position: absolute;
  z-index: 1;
  border-radius: 50%;
}
.kv-planet--a {
  width: 130px; height: 130px;
  left: -36px; top: 60px;
  background: radial-gradient(circle at 32% 30%, #B9A8FF, #7B5CF0 68%);
  box-shadow: inset -10px -14px 30px rgba(36, 52, 91, 0.3);
  opacity: 0.9;
}
.kv-planet--a::after {
  content: "";
  position: absolute;
  width: 170px; height: 34px;
  left: -20px; top: 48px;
  border: 5px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  transform: rotate(-18deg);
}
.kv-planet--b {
  width: 90px; height: 90px;
  right: 4%; bottom: 22%;
  background: radial-gradient(circle at 32% 30%, #FFE29A, #FFC83D 68%);
  box-shadow: inset -8px -10px 22px rgba(200, 130, 20, 0.3);
  opacity: 0.85;
}
.kv-hero__clouds {
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  z-index: 2;
  display: block;
  width: 100%;
}

/* ================= 四大成长力 ================= */
.kv-growth {
  position: relative;
  z-index: 5;
  margin-top: -64px;
}
.kv-growth__wrap {
  background: #fff;
  border-radius: var(--kevin-radius-xl);
  box-shadow: var(--kevin-shadow-lg);
  padding: 34px 38px;
  display: grid;
  grid-template-columns: repeat(4, 1fr) auto;
  gap: 28px;
  align-items: center;
}
.kv-growth__item {
  display: flex;
  align-items: center;
  gap: 14px;
}
.kv-growth__icon {
  width: 52px; height: 52px;
  border-radius: var(--kevin-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: rgba(108, 85, 245, 0.1);
  color: var(--kevin-primary);
}
.kv-growth__item h4 {
  margin: 0 0 2px;
  font-size: 17px;
  font-weight: 700;
  color: var(--kevin-text);
}
.kv-growth__item p {
  margin: 0;
  font-size: 12.5px;
  color: var(--kevin-text-secondary);
  line-height: 1.5;
}
.kv-growth__slogan {
  text-align: right;
  padding-left: 20px;
  border-left: 1px dashed var(--kevin-border);
  min-width: 200px;
}
.kv-growth__slogan strong {
  display: block;
  font-size: 21px;
  font-weight: 800;
  color: var(--kevin-primary);
  white-space: nowrap;
}
.kv-growth__slogan span {
  display: block;
  font-size: 13px;
  color: var(--kevin-text-secondary);
  line-height: 1.5;
}

/* ================= 品牌介绍 ================= */
.kv-brand__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.kv-brand__text h2 {
  font-size: 34px;
  font-weight: 700;
  margin: 0 0 8px;
}
.kv-brand__text h2 .kv-hl { color: var(--kevin-primary); }
.kv-brand__text .kv-brand__slogan {
  color: var(--kevin-primary);
  font-weight: 600;
  font-size: 16px;
  margin: 0 0 16px;
}
.kv-brand__text > p {
  color: var(--kevin-text-secondary);
  font-size: 15.5px;
  line-height: 1.9;
  margin: 0 0 28px;
}
.kv-brand__media {
  position: relative;
  border-radius: var(--kevin-radius-xl);
  overflow: hidden;
  box-shadow: var(--kevin-shadow-lg);
}
.kv-brand__media img { display: block; width: 100%; height: 340px; object-fit: cover; }
.kv-brand__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(36, 52, 91, 0.18);
  cursor: pointer;
  transition: background 0.2s;
}
.kv-brand__play:hover { background: rgba(36, 52, 91, 0.3); }
.kv-brand__play span {
  width: 76px; height: 76px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--kevin-shadow-floating);
  color: var(--kevin-primary);
  font-size: 13px;
  font-weight: 700;
}
.kv-brand__playlabel {
  position: absolute;
  bottom: 20px;
  left: 24px;
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  text-shadow: 0 2px 8px rgba(36, 52, 91, 0.5);
}
.kv-brand__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(36, 52, 91, 0.65);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 2;
  transition: background 0.2s;
}
.kv-brand__close:hover { background: rgba(36, 52, 91, 0.85); }

/* ================= 课程体系卡 ================= */
.kv-course-card {
  background: #fff;
  border-radius: var(--kevin-radius-lg);
  overflow: hidden;
  box-shadow: var(--kevin-shadow-card);
  transition: transform 0.25s, box-shadow 0.25s;
  display: flex;
  flex-direction: column;
}
.kv-course-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--kevin-shadow-lg);
}
.kv-course-card__cover {
  position: relative;
  height: 150px;
  overflow: hidden;
}
.kv-course-card__cover img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.kv-course-card__cover .kv-course-card__tag {
  position: absolute;
  left: 14px; top: 14px;
  padding: 5px 14px;
  border-radius: var(--kevin-radius-round);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  backdrop-filter: blur(4px);
  background: rgba(36, 52, 91, 0.35);
}
.kv-course-card__body { padding: 20px 20px 22px; flex: 1; display: flex; flex-direction: column; }
.kv-course-card__body h3 {
  margin: 0 0 4px;
  font-size: 19px;
  font-weight: 700;
}
.kv-course-card__body .kv-course-card__en {
  font-family: var(--kevin-font-en);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--kevin-text-secondary);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.kv-course-card__body > p {
  font-size: 13.5px;
  color: var(--kevin-text-secondary);
  line-height: 1.7;
  margin: 0 0 14px;
}
.kv-course-card__items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.kv-course-card__items span {
  font-size: 12.5px;
  padding: 4px 12px;
  border-radius: var(--kevin-radius-round);
  background: var(--kevin-bg);
  color: var(--kevin-text);
  border: 1px solid var(--kevin-border);
}
.kv-course-card__foot { margin-top: auto; }
.kv-course-card__foot a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
}
.kv-course-card--orange h3, .kv-course-card--orange .kv-course-card__foot a { color: var(--kevin-orange); }
.kv-course-card--blue h3, .kv-course-card--blue .kv-course-card__foot a { color: var(--kevin-blue-light); }
.kv-course-card--purple h3, .kv-course-card--purple .kv-course-card__foot a { color: var(--kevin-primary); }
.kv-course-card--green h3, .kv-course-card--green .kv-course-card__foot a { color: var(--kevin-green); }

/* ================= 数据条 ================= */
.kv-stats {
  background: var(--kevin-gradient-hero);
  border-radius: var(--kevin-radius-xl);
  padding: 40px 48px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--kevin-shadow-lg);
}
.kv-stats__item { text-align: center; color: #fff; position: relative; z-index: 2; }
.kv-stats__item strong {
  display: block;
  font-family: var(--kevin-font-en);
  font-size: 38px;
  font-weight: 800;
  line-height: 1.2;
}
.kv-stats__item strong i { font-style: normal; color: var(--kevin-yellow); }
.kv-stats__item span { font-size: 14px; color: rgba(255, 255, 255, 0.85); white-space: nowrap; }

/* ================= CTA Banner ================= */
.kv-cta {
  position: relative;
  background: var(--kevin-gradient-hero);
  border-radius: var(--kevin-radius-xl);
  overflow: hidden;
  padding: 44px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  box-shadow: var(--kevin-shadow-lg);
}
.kv-cta__text { position: relative; z-index: 2; }
.kv-cta__text h3 {
  margin: 0 0 8px;
  font-size: 30px;
  font-weight: 800;
  color: #fff;
}
.kv-cta__text p {
  margin: 0;
  color: rgba(255, 255, 255, 0.85);
  font-family: var(--kevin-font-en);
  letter-spacing: 2px;
  font-size: 13px;
}
.kv-cta__actions { display: flex; gap: 14px; position: relative; z-index: 2; flex-shrink: 0; }
.kv-cta__mascot {
  position: absolute;
  right: 30%;
  bottom: 0;
  width: 128px;
  z-index: 1;
  filter: drop-shadow(0 8px 16px rgba(36, 52, 91, 0.3));
  pointer-events: none;
}
.kv-section-title { position: relative; }
.kv-title-mascot {
  position: absolute;
  right: 6%;
  top: -30px;
  width: 88px;
  filter: drop-shadow(0 10px 18px rgba(36, 52, 91, 0.28));
  animation: kv-float 4.5s ease-in-out infinite;
  pointer-events: none;
}
.kv-title-mascot--left { right: auto; left: 6%; }
.kv-head-mascot {
  height: 48px;
  width: auto;
  margin-left: 6px;
  filter: drop-shadow(0 6px 10px rgba(36, 52, 91, 0.22));
  animation: kv-float 4.5s ease-in-out infinite;
  pointer-events: none;
  user-select: none;
}

/* ================= Footer ================= */
.kv-footer {
  background: linear-gradient(180deg, #FFFFFF 0%, #F1EFFF 100%);
  border-top: 1px solid var(--kevin-border);
  padding: 56px 0 0;
  margin-top: 80px;
}
.kv-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
}
.kv-footer__brand img { height: 44px; margin-bottom: 16px; }
.kv-footer__brand p {
  color: var(--kevin-text-secondary);
  font-size: 14px;
  line-height: 1.8;
  margin: 0 0 18px;
}
.kv-footer__slogan {
  color: var(--kevin-primary);
  font-weight: 700;
  font-size: 15px;
}
.kv-footer__col h4 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 18px;
  color: var(--kevin-text);
}
.kv-footer__col a {
  display: block;
  color: var(--kevin-text-secondary);
  font-size: 14px;
  padding: 5px 0;
  transition: color 0.2s;
}
.kv-footer__col a:hover { color: var(--kevin-primary); }
.kv-footer__contact p {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--kevin-text-secondary);
  font-size: 14px;
  margin: 0 0 12px;
}
.kv-footer__contact .kv-footer__phone {
  font-family: var(--kevin-font-en);
  font-size: 20px;
  font-weight: 700;
  color: var(--kevin-primary);
}
.kv-footer__qr {
  display: flex;
  gap: 14px;
  margin-top: 10px;
}
.kv-footer__qr .kv-qr-box {
  width: 86px; height: 86px;
  border-radius: var(--kevin-radius-sm);
  border: 1px solid var(--kevin-border);
  background: var(--kevin-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--kevin-text-secondary);
  font-size: 12px;
  text-align: center;
  overflow: hidden;
}
.kv-footer__qr .kv-qr-box img { width: 100%; height: 100%; object-fit: cover; }
.kv-footer__bottom {
  border-top: 1px solid var(--kevin-border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--kevin-text-secondary);
  font-size: 13px;
  flex-wrap: wrap;
}
.kv-footer__bottom .kv-footer__en {
  font-family: var(--kevin-font-en);
  letter-spacing: 1.5px;
  font-size: 11px;
}

/* ================= 悬浮咨询 / 移动底栏 ================= */
.kv-floating {
  position: fixed;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.kv-floating a, .kv-floating button {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--kevin-border);
  box-shadow: var(--kevin-shadow-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--kevin-primary);
  cursor: pointer;
  transition: transform 0.2s;
  font-size: 10px;
  gap: 2px;
}
.kv-floating a:hover, .kv-floating button:hover { transform: scale(1.08); }
.kv-mobile-bar {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 90;
  background: #fff;
  border-top: 1px solid var(--kevin-border);
  box-shadow: 0 -6px 20px rgba(36, 52, 91, 0.08);
  padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
}
.kv-mobile-bar__inner { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.kv-mobile-bar a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 0;
  border-radius: var(--kevin-radius-round);
  font-size: 14px;
  font-weight: 600;
  color: var(--kevin-primary);
  background: var(--kevin-bg);
}
.kv-mobile-bar a.kv-mobile-bar--cta {
  background: var(--kevin-gradient-btn);
  color: #fff;
}

/* ================= 表单 ================= */
.kv-form { display: grid; gap: 18px; }
.kv-form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.kv-form__field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--kevin-text);
}
.kv-form__field label em { color: #FF4D4F; font-style: normal; margin-right: 4px; }
.kv-form__field input,
.kv-form__field select,
.kv-form__field textarea {
  width: 100%;
  box-sizing: border-box;
  padding: 13px 16px;
  border: 1.5px solid var(--kevin-border);
  border-radius: var(--kevin-radius-md);
  font-size: 14.5px;
  font-family: var(--kevin-font-cn);
  color: var(--kevin-text);
  background: #fff;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.kv-form__field input:focus,
.kv-form__field select:focus,
.kv-form__field textarea:focus {
  border-color: var(--kevin-primary);
  box-shadow: 0 0 0 4px rgba(108, 85, 245, 0.12);
}
.kv-form__field .kv-form__error {
  display: none;
  color: #FF4D4F;
  font-size: 12.5px;
  margin-top: 6px;
}
.kv-form__field.kv-has-error input,
.kv-form__field.kv-has-error select { border-color: #FF4D4F; }
.kv-form__field.kv-has-error .kv-form__error { display: block; }

/* ================= Toast ================= */
.kv-toast {
  position: fixed;
  top: 86px;
  left: 50%;
  transform: translateX(-50%) translateY(-16px);
  z-index: 200;
  padding: 14px 26px;
  border-radius: var(--kevin-radius-md);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  box-shadow: var(--kevin-shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.kv-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.kv-toast--success { background: linear-gradient(135deg, #3ECF8E, #16B374); }
.kv-toast--error { background: linear-gradient(135deg, #FF6B6B, #F03E3E); }

/* ================= 动画 ================= */
@keyframes kv-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}
@keyframes kv-twinkle {
  0%, 100% { opacity: 0.35; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.1); }
}
.kv-fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.kv-fade-up.kv-inview {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .kv-fade-up { opacity: 1; transform: none; transition: none; }
  .kv-enroll__mascot, [class*="kv-float"], .kv-hero__mascot { animation: none; }
}