/* ===== 中原青年 AI 實戰養成班 — 一頁式招生網站 ===== */

:root {
  --bg: #0b1020;
  --bg2: #0f1630;
  --surface: #151d38;
  --surface2: #1b2547;
  --border: #2a3565;
  --text: #eef2ff;
  --text2: #b8c1e6;
  --text3: #8994c4;
  --accent: #6c8cff;
  --accent2: #b06cff;
  --accent3: #37e0c8;
  --danger: #ff6b8a;
  --grad: linear-gradient(120deg, #6c8cff 0%, #b06cff 55%, #37e0c8 120%);
  --grad-soft: linear-gradient(120deg, rgba(108, 140, 255, .18), rgba(176, 108, 255, .18));
  --shadow: 0 18px 50px rgba(0, 0, 0, .45);
  --shadow-sm: 0 8px 24px rgba(0, 0, 0, .3);
  --radius: 18px;
  --radius-sm: 12px;
  --font: "Noto Sans TC", system-ui, -apple-system, "Segoe UI", "Microsoft JhengHei", sans-serif;
  --nav-h: 68px;
  --maxw: 1160px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font);
  background: radial-gradient(1200px 700px at 80% -10%, rgba(176, 108, 255, .18), transparent 60%),
    radial-gradient(1000px 600px at 0% 10%, rgba(108, 140, 255, .16), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container {
  width: min(100% - 40px, var(--maxw));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - 40px, 820px);
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 900;
  letter-spacing: .2px;
}

strong {
  color: #fff;
  font-weight: 700;
}

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

/* ===== 導覽列 ===== */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(11, 16, 32, .55);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s;
}

.nav.scrolled {
  background: rgba(11, 16, 32, .9);
  border-bottom-color: var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.nav__logo {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--grad);
  color: #0b1020;
  font-weight: 900;
  font-size: 15px;
  box-shadow: 0 6px 16px rgba(108, 140, 255, .5);
}

.nav__brandtext {
  font-size: 16px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav__links a {
  padding: 8px 14px;
  border-radius: 10px;
  color: var(--text2);
  font-size: 15px;
  font-weight: 500;
  transition: color .2s, background .2s;
}

.nav__links a:hover {
  color: #fff;
  background: rgba(255, 255, 255, .06);
}

.nav__links a.active {
  color: #fff;
}

.nav__cta {
  background: var(--grad);
  color: #0b1020 !important;
  font-weight: 700 !important;
  box-shadow: 0 8px 20px rgba(108, 140, 255, .4);
}

.nav__cta:hover {
  background: var(--grad) !important;
  filter: brightness(1.08);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}

.nav__toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: .25s;
}

.nav__toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== 按鈕 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 15px;
  transition: transform .18s, box-shadow .2s, filter .2s, background .2s;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--grad);
  color: #0b1020;
  box-shadow: 0 12px 28px rgba(108, 140, 255, .45);
}

.btn--primary:hover {
  filter: brightness(1.08);
  box-shadow: 0 16px 34px rgba(108, 140, 255, .55);
}

.btn--ghost {
  background: rgba(255, 255, 255, .05);
  color: var(--text);
  border-color: var(--border);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, .1);
  border-color: var(--accent);
}

.btn--text {
  color: var(--text2);
  padding-inline: 8px;
}

.btn--text:hover {
  color: #fff;
}

.btn--lg {
  padding: 16px 34px;
  font-size: 16px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 80px) 0 90px;
  overflow: hidden;
}

.hero__glow {
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 900px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(176, 108, 255, .22), transparent 60%);
  filter: blur(30px);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  text-align: center;
}

.hero__eyebrow {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent3);
  background: rgba(55, 224, 200, .1);
  border: 1px solid rgba(55, 224, 200, .3);
  letter-spacing: 1px;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(30px, 5.2vw, 60px);
  margin-bottom: 26px;
  letter-spacing: 1px;
}

.hero__sub {
  max-width: 780px;
  margin: 0 auto 38px;
  color: var(--text2);
  font-size: clamp(15px, 1.7vw, 18px);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  align-items: center;
  margin-bottom: 60px;
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(24px, 6vw, 80px);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat__num {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 900;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat__label {
  color: var(--text3);
  font-size: 15px;
  margin-top: 8px;
}

/* ===== Section 通用 ===== */
.section {
  padding: clamp(64px, 9vw, 110px) 0;
  position: relative;
}

.section--alt {
  background: linear-gradient(180deg, transparent, rgba(21, 29, 56, .55), transparent);
}

.section__head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto clamp(40px, 6vw, 64px);
}

.section__head h2 {
  font-size: clamp(26px, 3.6vw, 40px);
  margin-top: 14px;
}

.section__lead {
  color: var(--text2);
  margin-top: 18px;
  font-size: 16px;
}

.tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  background: var(--grad-soft);
  border: 1px solid var(--border);
  letter-spacing: 1px;
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: 22px;
}

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

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ===== Card ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.card--accent {
  background: linear-gradient(160deg, rgba(108, 140, 255, .16), rgba(176, 108, 255, .14));
  border-color: var(--accent2);
}

.card__ico {
  font-size: 30px;
  margin-bottom: 14px;
}

.card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.card p {
  color: var(--text2);
  font-size: 15px;
}

/* ===== 核心理念 ===== */
.concept {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.concept h2 {
  font-size: clamp(26px, 3.6vw, 42px);
  margin: 16px 0 24px;
}

.concept>p {
  color: var(--text2);
  font-size: 17px;
}

.concept__challenges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 36px 0;
  text-align: left;
}

.challenge {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.challenge span {
  font-size: 26px;
}

.challenge p {
  color: var(--text2);
  font-size: 15px;
  margin: 0;
}

.concept__foot {
  color: var(--text2);
  font-size: 16px;
}

/* ===== Panel ===== */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.panel h3 {
  font-size: 18px;
  margin-bottom: 10px;
  margin-top: 22px;
}

.panel h3:first-child {
  margin-top: 0;
}

.panel p {
  color: var(--text2);
  font-size: 15px;
}

.panel--highlight {
  background: linear-gradient(160deg, rgba(108, 140, 255, .14), rgba(176, 108, 255, .12));
  border-color: var(--accent2);
}

.panel__big {
  font-size: 22px !important;
  color: #fff !important;
  font-weight: 700;
  margin: 14px 0 !important;
}

/* ===== 班別卡 ===== */
.classcard {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 30px;
  overflow: hidden;
}

.classcard::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--grad);
}

.classcard--b::before {
  background: linear-gradient(120deg, #37e0c8, #6c8cff);
}

.classcard__badge {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  background: var(--grad);
  color: #0b1020;
  margin-bottom: 14px;
}

.classcard--b .classcard__badge {
  background: linear-gradient(120deg, #37e0c8, #6c8cff);
}

.classcard h3 {
  font-size: 22px;
  margin-bottom: 14px;
}

.classcard__pos {
  color: var(--text2);
  font-size: 15px;
  margin-bottom: 22px;
}

.classcard h4 {
  font-size: 14px;
  color: var(--accent3);
  margin: 20px 0 12px;
  letter-spacing: 1px;
}

.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chips li {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--text2);
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--border);
}

.chips--soft li {
  background: var(--grad-soft);
}

.checklist {
  list-style: none;
  display: grid;
  gap: 9px;
}

.checklist li {
  position: relative;
  padding-left: 28px;
  color: var(--text2);
  font-size: 15px;
}

.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 19px;
  height: 19px;
  margin-top: 3px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: var(--grad);
  color: #0b1020;
  font-size: 12px;
  font-weight: 900;
}

.checklist--lg li {
  font-size: 16px;
  padding: 4px 0 4px 32px;
}

.checklist--lg li::before {
  width: 22px;
  height: 22px;
}

/* ===== 時間軸 / 課程階段 ===== */
.timeline {
  display: grid;
  gap: 24px;
}

.phase {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 34px;
  border-left: 4px solid var(--accent);
}

.phase:nth-child(2) {
  border-left-color: var(--accent3);
}

.phase__num {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 8px;
}

.phase:nth-child(2) .phase__num {
  color: var(--accent3);
}

.phase h3 {
  font-size: 21px;
  margin-bottom: 14px;
}

.phase p {
  color: var(--text2);
  font-size: 15px;
  margin-bottom: 14px;
}

.phase .chips {
  margin: 16px 0;
}

.phase__out {
  background: var(--grad-soft);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  color: var(--text) !important;
  font-size: 14px !important;
  border: 1px solid var(--border);
  margin-bottom: 0 !important;
}

/* ===== 工具牆 ===== */
.toolgrid {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.toolgrid li {
  padding: 12px 22px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 500;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  transition: transform .2s, border-color .2s, background .2s;
}

.toolgrid li:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  background: var(--surface2);
}

/* ===== feature ===== */
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color .2s;
}

.feature:hover {
  border-color: var(--accent);
}

.feature h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.feature p {
  color: var(--text2);
  font-size: 15px;
}

.support__note {
  margin-top: 26px;
  text-align: center;
  color: var(--text2);
  font-size: 15px;
  max-width: 860px;
  margin-inline: auto;
}

/* ===== 開班資訊 ===== */
.infocard {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
}

.infocard__badge {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  background: var(--grad);
  color: #0b1020;
  margin-bottom: 14px;
}

.infocard h3 {
  font-size: 20px;
  margin-bottom: 18px;
}

.infocard dl {
  display: grid;
  gap: 14px;
}

.infocard dl>div {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 14px;
  align-items: start;
}

.infocard dt {
  color: var(--text3);
  font-size: 14px;
}

.infocard dd {
  color: var(--text);
  font-size: 15px;
}

.infobar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 22px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.infobar>div {
  background: var(--surface);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.infobar span {
  color: var(--text3);
  font-size: 13px;
}

.infobar strong {
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}

.info__disclaimer {
  text-align: center;
  color: var(--text3);
  font-size: 14px;
  margin-top: 20px;
}

.infobar--single {
  grid-template-columns: 1fr;
  max-width: 320px;
  margin-left: auto;
  margin-right: auto;
}
.infobar--single > div {
  align-items: center;
  text-align: center;
}

/* ===== FAQ ===== */
.faq {
  display: grid;
  gap: 12px;
}

.faq__item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color .2s;
}

.faq__item[open] {
  border-color: var(--accent);
}

.faq__item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 24px;
  font-weight: 700;
  font-size: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq__item summary::-webkit-details-marker {
  display: none;
}

.faq__item summary::after {
  content: "+";
  font-size: 24px;
  font-weight: 400;
  color: var(--accent);
  transition: transform .25s;
  flex-shrink: 0;
}

.faq__item[open] summary::after {
  transform: rotate(45deg);
}

.faq__body {
  padding: 0 24px 22px;
}

.faq__body p {
  color: var(--text2);
  font-size: 15px;
}

/* ===== CTA ===== */
.cta {
  padding: clamp(70px, 9vw, 120px) 0;
  position: relative;
}

.cta__inner {
  text-align: center;
  background: linear-gradient(150deg, rgba(108, 140, 255, .16), rgba(176, 108, 255, .14));
  border: 1px solid var(--accent2);
  border-radius: 28px;
  padding: clamp(40px, 6vw, 70px);
  box-shadow: var(--shadow);
}

.cta__inner h2 {
  font-size: clamp(26px, 4vw, 44px);
  margin-bottom: 18px;
}

.cta__inner>p {
  color: var(--text2);
  font-size: 17px;
  margin-bottom: 34px;
}

.cta__cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 36px;
  text-align: left;
}

.cta__card {
  background: rgba(11, 16, 32, .5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.cta__card strong {
  display: block;
  font-size: 18px;
  margin-bottom: 8px;
}

.cta__card span {
  color: var(--text2);
  font-size: 14px;
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 56px 0 40px;
  background: rgba(11, 16, 32, .6);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.footer__cols span {
  color: var(--text3);
  font-size: 13px;
}

.footer__cols p {
  color: var(--text);
  font-size: 15px;
  margin-top: 6px;
}

.footer__name {
  color: var(--text);
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 8px;
}

.footer__note {
  color: var(--text3);
  font-size: 13px;
}

/* ===== 回到頂端 ===== */
.totop {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  z-index: 90;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 20px;
  font-weight: 900;
  background: var(--grad);
  color: #0b1020;
  box-shadow: 0 10px 24px rgba(108, 140, 255, .5);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: .3s;
}

.totop.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ===== 捲動淡入 ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .6s ease, transform .6s ease;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* ===== RWD ===== */
@media (max-width: 900px) {

  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

@media (max-width: 760px) {
  .nav__brandtext {
    display: none;
  }

  .nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: rgba(11, 16, 32, .97);
    backdrop-filter: blur(14px);
    padding: 14px 20px 22px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform .3s;
    box-shadow: var(--shadow);
  }

  .nav__links.open {
    transform: translateY(0);
  }

  .nav__links a {
    padding: 14px 16px;
    font-size: 16px;
  }

  .nav__cta {
    text-align: center;
    margin-top: 6px;
  }

  .nav__toggle {
    display: flex;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

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

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

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

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

  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
    max-width: 320px;
  }
}

/* ===== 觸控裝置 (iPad) ===== */
@media (hover: none) and (pointer: coarse) {

  .card:hover,
  .toolgrid li:hover,
  .feature:hover {
    transform: none;
  }

  .faq__item summary {
    padding-block: 22px;
  }

  .btn {
    padding-block: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}