:root {
  --bg: #070b12;
  --panel: #0d1420;
  --panel-2: #101a2a;
  --panel-3: #142236;
  --line: rgba(157, 180, 208, .18);
  --line-strong: rgba(92, 231, 181, .28);
  --text: #eef6ff;
  --muted: #9fb0c5;
  --soft: #c7d4e5;
  --cyan: #40d8ff;
  --green: #5ce7b5;
  --blue: #6da8ff;
  --red: #ff6b7a;
  --gold: #ffd166;
  --shadow: 0 24px 70px rgba(0, 0, 0, .42);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 16% 0%, rgba(64, 216, 255, .16), transparent 28%),
    radial-gradient(circle at 90% 12%, rgba(92, 231, 181, .12), transparent 26%),
    linear-gradient(180deg, #07101c 0%, var(--bg) 42%, #05070b 100%);
  color: var(--text);
  font-family: "Be Vietnam Pro", Inter, Arial, sans-serif;
  line-height: 1.58;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.72), transparent 78%);
}

.page,
.course-advisor-section {
  width: min(1180px, calc(100% - 28px));
  margin: 28px auto;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(16, 26, 42, .96), rgba(9, 14, 23, .98)),
    var(--panel);
  box-shadow: var(--shadow);
}

.page {
  min-height: 100vh;
  padding: clamp(28px, 4vw, 58px);
}

.page::after,
.course-advisor-section::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(255,255,255,.08), transparent 34%);
  opacity: .42;
}

.page > *,
.course-advisor-section > * {
  position: relative;
  z-index: 1;
}

.page-1 {
  background:
    radial-gradient(circle at 18% 22%, rgba(64, 216, 255, .22), transparent 31%),
    radial-gradient(circle at 78% 16%, rgba(92, 231, 181, .18), transparent 30%),
    linear-gradient(145deg, #08101d, #0e1a2b 58%, #070b12);
  display: flex;
  flex-direction: column;
}

.glare {
  position: absolute;
  border-radius: 999px;
  filter: blur(54px);
  opacity: .28;
}

.glare-1 { width: 360px; height: 360px; background: var(--cyan); top: -110px; right: 8%; }
.glare-2 { width: 300px; height: 300px; background: var(--green); bottom: 10%; left: -90px; }

.cover-header, .page-header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon,
.advisor-avatar,
.step-num,
.advisor-course-number {
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--cyan), var(--green));
  color: #061019;
  font-weight: 900;
}

.logo-icon {
  width: 48px;
  height: 48px;
  font-size: 22px;
}

.brand-info span { display: block; }
.brand-name { font-weight: 800; letter-spacing: .03em; }
.brand-tagline { color: var(--muted); font-size: 12px; font-weight: 800; }

.badge-enterprise,
.advisor-mode,
.advisor-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: rgba(92, 231, 181, .08);
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
}

.cover-main {
  margin: auto 0;
  padding: 86px 0 58px;
  max-width: 1020px;
}

.kicker, .section-kicker {
  display: inline-block;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.main-title {
  margin: 20px 0 22px;
  font-family: "Be Vietnam Pro", Inter, sans-serif;
  font-size: clamp(46px, 7.4vw, 96px);
  line-height: .98;
  letter-spacing: 0;
  font-weight: 900;
  max-width: 1060px;
}

.title-line {
  display: block;
}

.text-gradient {
  background: linear-gradient(90deg, var(--cyan), var(--green), #f6fcae);
  -webkit-background-clip: text;
  color: transparent;
}

.subtitle {
  max-width: 850px;
  color: var(--soft);
  font-size: clamp(17px, 1.8vw, 22px);
  font-weight: 400;
}

.cover-features, .target-blocks, .ai-roles-grid, .grid-2col-syllabus, .grid-2col-p4 {
  display: grid;
  gap: 18px;
}

.cover-features { grid-template-columns: repeat(3, 1fr); margin-top: 38px; }

.c-feat-item,
.target-block,
.ai-role-card,
.syllabus-step,
.demo-card,
.roadmap-step,
.flow-step,
.advisor-course-item,
.advisor-selected,
.advisor-note {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, .045);
}

.c-feat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px;
  font-weight: 900;
}

.c-feat-item i { color: var(--green); font-size: 21px; }

.cover-footer {
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.target-blocks {
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
}

.target-block { padding: 20px; }
.target-label, .target-desc { display: block; color: var(--muted); font-size: 13px; }
.target-name { display: block; margin: 7px 0 5px; font-size: 20px; }
.target-divider { width: 1px; background: var(--line); }
.cover-footer-note { margin-top: 18px; color: var(--soft); font-weight: 800; }

.page-header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 22px;
  margin-bottom: 28px;
}

.page-title {
  margin: 6px 0 0;
  font-family: "Be Vietnam Pro", Inter, sans-serif;
  font-size: clamp(27px, 4vw, 42px);
  line-height: 1.18;
}

.page-number {
  color: rgba(199, 212, 229, .13);
  font-size: clamp(46px, 9vw, 92px);
  font-weight: 900;
  line-height: .8;
}

.box-title, .strategy-title, .sub-title, .block-title {
  margin: 0 0 16px;
  font-family: "Be Vietnam Pro", Inter, sans-serif;
  font-size: 22px;
}

.comparison-table-wrapper,
.pricing-strategy-box,
.class-summary-box,
.syllabus-box,
.demos-box,
.roadmap-section,
.methodology-box,
.contact-box,
.advisor-chat,
.advisor-course-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  background: rgba(8, 13, 22, .72);
}

.pricing-strategy-box, .roadmap-section, .grid-2col-p4 { margin-top: 22px; }

.comparison-table {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.comp-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.comp-row + .comp-row { border-top: 1px solid var(--line); }
.comp-col {
  padding: 18px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.comp-col + .comp-col { border-left: 1px solid var(--line); }
.comp-header .comp-col {
  background: rgba(109, 168, 255, .1);
  color: var(--soft);
  font-size: 13px;
  font-weight: 900;
}

.text-red { color: var(--red); }
.text-green { color: var(--green); }
.text-blue { color: var(--blue); }

.strategy-desc, .ai-role-card p, .syllabus-step p, .step-content p { color: var(--muted); }
.ai-roles-grid { grid-template-columns: repeat(3, 1fr); margin-top: 18px; }

.ai-role-card { padding: 20px; }
.ai-role-card p { margin-bottom: 0; }
.ai-avatar {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 6px 10px;
  border-radius: 6px;
  color: #fff;
  font-size: 12px;
  font-weight: 900;
  margin-bottom: 12px;
}

.claude-avatar { background: #7c4dff; }
.codex-avatar { background: #283548; }
.deepseek-avatar { background: #0a96a8; }

.cost-comparison {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 8px;
  background: rgba(92, 231, 181, .09);
  border: 1px solid var(--line-strong);
  color: var(--green);
  display: flex;
  gap: 12px;
}

.class-summary-box { margin-bottom: 22px; }
.border-green { border-left: 5px solid var(--green); }
.border-blue { border-left: 5px solid var(--blue); }
.grid-2col-syllabus { grid-template-columns: 1.05fr .95fr; }
.grid-2col-p4 { grid-template-columns: 1fr 1fr; }

.syllabus-timeline { display: grid; gap: 14px; }
.syllabus-step { padding: 16px; }

.s-step-num, .demo-badge {
  display: inline-flex;
  margin-bottom: 8px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.syllabus-step strong, .demo-card strong, .step-content strong { display: block; font-size: 17px; }
.demo-card { padding: 17px; margin-bottom: 15px; }
.demo-flow { display: grid; gap: 9px; margin-top: 12px; }
.flow-step { padding: 10px 12px; font-size: 14px; color: var(--soft); }
.flow-step span { font-weight: 900; color: var(--green); }
.demo-flow-arrow { color: var(--cyan); text-align: center; }

.roadmap-timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.roadmap-step { padding: 18px; }
.step-num { width: 42px; height: 42px; margin-bottom: 12px; }

.method-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.method-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: var(--soft);
}

.method-list i { color: var(--green); margin-top: 4px; }
.contact-card {
  padding: 20px;
  background: linear-gradient(145deg, rgba(64, 216, 255, .1), rgba(92, 231, 181, .08));
  border: 1px solid var(--line);
  border-radius: 8px;
}

.company-name { font-size: 20px; }
.mst { color: var(--muted); }
.contact-details { display: grid; gap: 12px; }
.contact-item { display: flex; gap: 12px; align-items: flex-start; color: var(--soft); }
.contact-item i { color: var(--green); margin-top: 4px; }

.p4-footer {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-weight: 800;
}

.motto { color: var(--green); }

.course-advisor-section {
  padding: clamp(28px, 4vw, 58px);
  background:
    radial-gradient(circle at 14% 18%, rgba(64, 216, 255, .16), transparent 34%),
    radial-gradient(circle at 86% 26%, rgba(92, 231, 181, .12), transparent 30%),
    linear-gradient(145deg, #0d1524, #07101a);
}

.advisor-heading {
  max-width: 860px;
  margin-bottom: 24px;
}

.advisor-heading h2 {
  margin: 14px 0 10px;
  font-family: "Be Vietnam Pro", Inter, sans-serif;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
}

.advisor-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.advisor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, .8fr);
  gap: 20px;
  align-items: stretch;
}

.advisor-chat,
.advisor-course-panel {
  background: rgba(5, 9, 15, .74);
  backdrop-filter: blur(16px);
}

.advisor-chat {
  display: flex;
  flex-direction: column;
  min-height: 640px;
}

.advisor-chat-header,
.advisor-agent,
.advisor-selected-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.advisor-agent { justify-content: flex-start; }
.advisor-avatar { width: 46px; height: 46px; }
.advisor-small {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
}

.advisor-small i {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--green);
  box-shadow: 0 0 16px var(--green);
}

.advisor-selected {
  padding: 14px 16px;
  margin: 18px 0;
}

.advisor-selected-top span,
.advisor-course-item small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.advisor-selected p {
  margin: 7px 0 0;
  color: var(--soft);
}

.advisor-messages {
  flex: 1;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 270px;
  max-height: 420px;
  padding-right: 6px;
}

.advisor-message {
  width: fit-content;
  max-width: min(84%, 620px);
  padding: 13px 15px;
  border-radius: 8px;
  white-space: pre-line;
}

.advisor-message-bot {
  background: rgba(255, 255, 255, .07);
  border: 1px solid var(--line);
  color: var(--soft);
}

.advisor-message-user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--cyan), var(--green));
  color: #041018;
  font-weight: 800;
}

.advisor-typing::after {
  content: "";
  display: inline-block;
  width: 28px;
  height: 10px;
  margin-left: 6px;
  background: radial-gradient(circle, var(--green) 40%, transparent 42%) 0 50% / 9px 9px repeat-x;
  animation: pulseDots 1s infinite linear;
}

@keyframes pulseDots {
  from { opacity: .25; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-1px); }
  to { opacity: .25; transform: translateY(0); }
}

.advisor-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0;
}

.advisor-chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.05);
  color: var(--soft);
  padding: 9px 12px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.advisor-chip:hover {
  border-color: var(--line-strong);
  color: var(--green);
}

.advisor-form {
  display: grid;
  grid-template-columns: 1fr 46px;
  gap: 10px;
}

.advisor-form input {
  min-width: 0;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.06);
  color: var(--text);
  padding: 0 14px;
  font: inherit;
}

.advisor-form input:focus {
  outline: 2px solid rgba(64, 216, 255, .24);
  border-color: var(--cyan);
}

.advisor-form button {
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--cyan), var(--green));
  color: #061019;
  cursor: pointer;
  font-size: 17px;
}

.advisor-course-panel {
  display: grid;
  align-content: start;
  gap: 14px;
}

.advisor-panel-heading {
  margin: 0 0 4px;
  font-family: "Be Vietnam Pro", Inter, sans-serif;
  font-size: 22px;
}

.advisor-course-item {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  padding: 16px;
}

.advisor-course-number {
  width: 42px;
  height: 42px;
}

.advisor-course-item strong {
  display: block;
  margin: 5px 0;
}

.advisor-course-item p,
.advisor-note {
  color: var(--muted);
  margin: 0;
}

.advisor-note {
  display: flex;
  gap: 12px;
  padding: 15px;
}

.advisor-note i { color: var(--green); margin-top: 4px; }

@media (max-width: 900px) {
  .cover-header, .page-header, .p4-footer { flex-direction: column; }
  .cover-features, .target-blocks, .ai-roles-grid, .grid-2col-syllabus, .grid-2col-p4, .roadmap-timeline, .comp-row, .advisor-layout {
    grid-template-columns: 1fr;
  }
  .target-divider, .comp-col + .comp-col { border-left: 0; }
  .target-divider { display: none; }
  .advisor-chat { min-height: 560px; }
}

@media (max-width: 560px) {
  .page,
  .course-advisor-section {
    width: calc(100% - 16px);
    margin: 12px auto;
    padding: 22px;
  }
  .cover-features { gap: 10px; }
  .advisor-chat-header { align-items: flex-start; flex-direction: column; }
  .advisor-message { max-width: 94%; }
}

@media print {
  body { background: #fff; color: #111; }
  .page {
    width: 100%;
    min-height: 100vh;
    margin: 0;
    border: 0;
    box-shadow: none;
    page-break-after: always;
  }
  .course-advisor-section { display: none; }
}