/* ===== 基础与变量 ===== */
:root {
  --color-bg: #0f0f12;
  --color-surface: #18181c;
  --color-surface-2: #222228;
  --color-text: #e8e8ec;
  --color-text-muted: #9898a0;
  --color-accent: #f59e0b;
  --color-accent-hover: #fbbf24;
  --color-accent-soft: rgba(245, 158, 11, 0.15);
  --font-sans: "Noto Sans TC", -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 顶部导航 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 15, 18, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

/* 漢堡按鈕：桌面隱藏，手機顯示 */
.btn-menu {
  display: none;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  z-index: 101;
  position: relative;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: var(--transition);
}

.menu-icon {
  position: relative;
}

.menu-icon::before,
.menu-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-icon::before {
  top: -7px;
}

.menu-icon::after {
  top: 7px;
}

/* 漢堡展開時變 X */
body.nav-open .menu-icon {
  background: transparent;
}

body.nav-open .menu-icon::before {
  top: 0;
  transform: rotate(45deg);
}

body.nav-open .menu-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* 桌面版導航（在 header 內） */
.nav-desktop {
  display: flex;
  gap: 28px;
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
}

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

/* 手機版全螢幕導航：預設隱藏，獨立於 header 避免裁切 */
.nav-overlay {
  display: none;
}

.btn-cta {
  display: inline-block;
  padding: 10px 20px;
  background: var(--color-accent);
  color: #0f0f12;
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-cta:hover {
  background: var(--color-accent-hover);
}

/* ===== Hero 主视觉 ===== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, var(--color-accent-soft) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(100, 80, 200, 0.08) 0%, transparent 50%),
    var(--color-bg);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  text-align: center;
  width: 100%;
}

.hero-image {
  display: block;
  max-width: 100%;
  width: auto;
  height: auto;
  margin: 0 auto 24px;
  object-fit: contain;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-title em {
  color: var(--color-accent);
  font-style: normal;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
}

.hero-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-badges span {
  padding: 8px 16px;
  background: var(--color-surface-2);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.btn-primary {
  display: inline-block;
  padding: 16px 36px;
  background: var(--color-accent);
  color: #0f0f12;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  border-radius: var(--radius);
  transition: background var(--transition), transform 0.2s ease;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
}

/* ===== 通用区块 ===== */
.section {
  padding: 80px 0;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
}

.section-desc {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 48px;
}

/* ===== 公司介绍 ===== */
.section-company {
  background: var(--color-surface);
}

.company-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.company-text .lead {
  font-size: 1.15rem;
  color: var(--color-text);
  margin-bottom: 16px;
}

.company-text p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.company-highlights {
  list-style: none;
}

.company-highlights li {
  padding: 8px 0;
  color: var(--color-text);
  font-size: 1rem;
}

.company-visual {
  display: flex;
  justify-content: center;
}

.company-card {
  width: 220px;
  height: 220px;
  background: linear-gradient(135deg, var(--color-accent-soft), rgba(100, 80, 200, 0.15));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}

.company-card .big-num {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.03em;
}

.company-card .label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 8px;
}

/* ===== 金牌导师 ===== */
.mentor-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.mentor-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: border-color var(--transition), transform var(--transition);
}

.mentor-card:hover {
  border-color: var(--color-accent-soft);
  transform: translateY(-4px);
}

.mentor-photo {
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--color-surface-2);
}

.mentor-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.mentor-card h3 {
  font-size: 1.25rem;
  margin: 20px 20px 4px;
}

.mentor-role {
  font-size: 0.85rem;
  color: var(--color-accent);
  margin: 0 20px 12px;
}

.mentor-bio {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  padding: 0 20px 24px;
  line-height: 1.5;
}

/* ===== AI 优势 ===== */
.section-ai {
  background: var(--color-surface);
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.ai-card {
  background: var(--color-bg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.ai-card:hover {
  border-color: var(--color-accent-soft);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.ai-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.ai-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.ai-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ===== 学员成功案例 ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.case-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: border-color var(--transition), transform var(--transition);
}

.case-card:hover {
  border-color: var(--color-accent-soft);
  transform: translateY(-4px);
}

.case-photo {
  aspect-ratio: 3/2;
  overflow: hidden;
  background: var(--color-surface-2);
}

.case-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-content {
  padding: 20px;
}

.case-content h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.case-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ===== 联系方式 ===== */
.section-contact {
  background: var(--color-surface);
}

.section-cta-center {
  text-align: center;
}

.section-cta-center .container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.contact-box {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.contact-label {
  flex: 0 0 80px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.contact-value {
  flex: 1;
  font-weight: 500;
}

.btn-copy,
.btn-call {
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: opacity var(--transition);
}

.btn-copy {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: none;
}

.btn-call {
  background: var(--color-accent);
  color: #0f0f12;
  font-weight: 600;
}

.btn-copy:hover,
.btn-call:hover {
  opacity: 0.9;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--color-surface-2);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--color-text-muted);
}

.contact-form textarea {
  resize: vertical;
  min-height: 80px;
}

.btn-submit {
  padding: 16px;
  background: var(--color-accent);
  color: #0f0f12;
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-submit:hover {
  background: var(--color-accent-hover);
}

/* ===== 页脚 ===== */
.footer {
  padding: 24px 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* ===== 響應式（手機版導航）===== */
@media (max-width: 768px) {
  .nav-desktop {
    display: none !important;
  }

  .btn-menu {
    display: flex !important;
  }

  /* 全螢幕導航層：獨立於 header，完整覆蓋可視區域 */
  .nav-overlay {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 100vw;
    height: 100%;
    height: 100dvh;
    min-height: 100vh;
    margin: 0;
    padding: 80px 24px 32px;
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition), visibility var(--transition);
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 99;
    -webkit-overflow-scrolling: touch;
  }

  body.nav-open {
    overflow: hidden;
  }

  body.nav-open .nav-overlay {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-overlay a {
    width: 100%;
    padding: 18px 16px;
    text-align: center;
    font-size: 1.125rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--color-text);
    flex-shrink: 0;
  }

  .nav-overlay a:hover {
    color: var(--color-accent);
    background: rgba(255, 255, 255, 0.03);
  }

  .company-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .company-visual {
    order: -1;
  }

  .mentor-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
    margin: 0 auto;
  }

  .ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cases-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .contact-box {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) and (min-width: 769px) {
  .nav-desktop {
    display: none !important;
  }

  .btn-menu {
    display: flex !important;
  }

  .nav-overlay {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    height: 100dvh;
    min-height: 100vh;
    margin: 0;
    padding: 80px 24px 32px;
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition), visibility var(--transition);
    overflow-y: auto;
    z-index: 99;
  }

  body.nav-open .nav-overlay {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-overlay a {
    width: 100%;
    padding: 18px 16px;
    text-align: center;
    font-size: 1.125rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--color-text);
  }
}

@media (max-width: 600px) {
  .section {
    padding: 56px 0;
  }

  .ai-grid {
    grid-template-columns: 1fr;
  }

  .contact-box {
    padding: 24px;
  }
}