/* ============================================
   OLIENT TECH 実践教育プログラム 2026 Spring
   A4 Lecture Document Stylesheet v3.0
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #0f172a;
  --color-accent: #2563eb;
  --color-accent-light: #eff6ff;
  --color-link: #1d4ed8;
  --color-bg: #ffffff;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-border: #e2e8f0;
  --color-code-bg: #f1f5f9;
  --color-section-bg: #f8fafc;
  --color-highlight: #fef9c3;
  --color-paper: #ffffff;
  --color-cat-a: #78716c;
  --color-cat-b: #2563eb;
  --color-cat-c: #7c3aed;
  --color-cat-d: #0d9488;
  --color-cat-e: #ea580c;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Meiryo", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Source Code Pro", "Consolas", monospace;
  --radius-default: 8px;
}

@page {
  size: A4 portrait;
  margin: 18mm 16mm 22mm 16mm;
}

@page :first {
  margin: 0;
}

html {
  font-size: 10pt;
  line-height: 1.85;
  color: var(--color-text);
  font-family: var(--font-sans);
  background: var(--color-bg);
  -webkit-print-color-adjust: exact;
  print-color-adjust: exact;
}

body {
  max-width: 210mm;
  margin: 0 auto;
  padding: 0;
}

@media screen {
  html {
    background: #e8e8e8;
  }

  body {
    max-width: 800px;
    margin: 0 auto;
    padding-top: 0;
    background: transparent;
  }
}

/* ============================================
   VIEWER BAR (screen only)
   ============================================ */
.viewer-bar {
  display: none;
}

@media screen {
  .viewer-bar {
    display: flex;
    align-items: center;
    gap: 20px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 10000;
    background: rgba(15, 23, 42, 0.95);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    color: #ffffff;
    padding: 16px 32px;
    font-size: 11pt;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  }

  .viewer-bar .viewer-logo {
    font-weight: 800;
    font-size: 11pt;
    letter-spacing: 1.5px;
    opacity: 0.95;
    white-space: nowrap;
  }

  .viewer-bar .viewer-sep {
    width: 1px;
    height: 22px;
    background: rgba(255, 255, 255, 0.18);
    flex-shrink: 0;
  }

  .viewer-bar .viewer-title {
    font-weight: 700;
    font-size: 12pt;
    opacity: 0.9;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    letter-spacing: 0.5px;
  }

  .viewer-bar .viewer-week,
  .viewer-bar .viewer-meta {
    font-size: 9pt;
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0.45;
    white-space: nowrap;
  }

  .viewer-pdf-btn {
    margin-left: auto;
    background: var(--color-accent);
    color: #fff;
    border: none;
    padding: 10px 24px;
    border-radius: 24px;
    font-size: 10pt;
    font-weight: 700;
    cursor: pointer;
    letter-spacing: 0.5px;
    white-space: nowrap;
    transition: background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
  }

  .viewer-pdf-btn:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.45);
  }

  .viewer-pdf-btn:active {
    transform: translateY(0);
  }

  body:has(.viewer-bar) {
    padding-top: 60px;
  }
}

@media print {
  .viewer-bar {
    display: none !important;
  }
}

/* ============================================
   COVER PAGE
   ============================================ */
.cover-page {
  position: relative;
  width: 100%;
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  page-break-after: always;
}

.cover-page .cover-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.cover-page .cover-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.cover-page .cover-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.05) 0%,
    rgba(0, 0, 0, 0.15) 40%,
    rgba(0, 0, 0, 0.65) 75%,
    rgba(0, 0, 0, 0.85) 100%
  );
}

.cover-page .cover-content {
  position: relative;
  z-index: 2;
  padding: 48px 40px 56px;
  color: #ffffff;
}

.cover-page .cover-program {
  font-size: 8.5pt;
  letter-spacing: 4px;
  text-transform: uppercase;
  opacity: 0.75;
  margin-bottom: 16px;
  font-weight: 400;
}

.cover-page .cover-week {
  display: inline-block;
  font-size: 9pt;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 4px 16px;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  border-radius: 20px;
  margin-bottom: 20px;
}

.cover-page .cover-title {
  font-size: 28pt;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
  color: #ffffff;
}

.cover-page .cover-subtitle {
  font-size: 11pt;
  font-weight: 400;
  line-height: 1.7;
  opacity: 0.85;
  max-width: 480px;
  margin-bottom: 32px;
}

.cover-page .cover-meta {
  font-size: 9pt;
  opacity: 0.6;
  border-top: 1px solid rgba(255,255,255,0.25);
  padding-top: 16px;
}

.cover-page .cover-meta span {
  margin-right: 20px;
}

@media print {
  .cover-page {
    min-height: auto;
    height: 297mm;
    margin: -18mm -16mm 0;
    width: calc(100% + 32mm);
    padding: 0;
  }
}

@media screen {
  .cover-page {
    min-height: 1122px; /* approx A4 at 96dpi */
    border-radius: 0;
    margin-bottom: 32px;
  }
}

/* ============================================
   DOCUMENT BODY (after cover) — Paper Look
   ============================================ */
.doc-body {
  padding: 36px 32px 40px;
}

@media screen {
  .doc-body {
    background: var(--color-paper);
    padding: 56px 48px 64px;
    border-radius: 0;
    box-shadow:
      0 4px 24px rgba(0, 0, 0, 0.12),
      0 1px 4px rgba(0, 0, 0, 0.06);
    margin-bottom: 48px;
    position: relative;
  }

  /* Subtle paper grain texture */
  .doc-body::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.015'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
  }

  .doc-body > * {
    position: relative;
    z-index: 1;
  }
}

@media print {
  .doc-body {
    padding: 0;
  }
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5 {
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.4;
}

h1 {
  font-size: 20pt;
  margin-bottom: 4px;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 15pt;
  font-weight: 800;
  margin-top: 36px;
  margin-bottom: 18px;
  padding: 14px 20px;
  background: #eef2ff;
  border-left: 4px solid var(--color-accent);
  border-bottom: none;
  border-radius: 0 var(--radius-default) var(--radius-default) 0;
}

h3 {
  font-size: 11.5pt;
  margin-top: 22px;
  margin-bottom: 8px;
  color: #334155;
}

h4 {
  font-size: 10.5pt;
  margin-top: 16px;
  margin-bottom: 6px;
}

p {
  margin-bottom: 10px;
  text-align: justify;
  word-break: break-all;
  overflow-wrap: break-word;
}

strong {
  color: var(--color-primary);
}

/* --- Horizontal Rule --- */
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 24px 0;
}

/* ============================================
   DOCUMENT HEADER (in-body, after cover)
   Full-width dark banner — bleeds to .page edges
   ============================================ */
.doc-header {
  margin: -68px -60px 24px -60px;
  padding: 36px 60px 28px;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  color: #ffffff;
  page-break-after: avoid;
  position: relative;
  overflow: hidden;
  border-radius: 0;
}

/* Bottom accent stripe */
.doc-header::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #2563eb 0%, #60a5fa 50%, #2563eb 100%);
}

/* Decorative circle */
.doc-header::after {
  content: "";
  position: absolute;
  top: -20px;
  right: 40px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.doc-header .program-label {
  font-size: 8pt;
  color: rgba(255, 255, 255, 0.45);
  text-transform: uppercase;
  letter-spacing: 5px;
  margin-bottom: 16px;
  font-weight: 500;
}

.doc-header h1 {
  font-size: 24pt;
  margin-bottom: 12px;
  color: #ffffff;
  letter-spacing: -0.5px;
  font-weight: 800;
  line-height: 1.25;
}

.doc-header .subtitle {
  font-size: 10.5pt;
  color: rgba(255, 255, 255, 0.75);
  font-weight: 400;
  line-height: 1.7;
  max-width: 600px;
}

.doc-header .meta {
  margin-top: 18px;
  font-size: 8.5pt;
  color: rgba(255, 255, 255, 0.38);
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.doc-header .meta span {
  display: inline-block;
  margin: 0 8px;
}

.doc-header .meta span:first-child {
  margin-left: 0;
}

/* ============================================
   SECTIONS
   ============================================ */
section {
  margin-bottom: 28px;
}

section.page-break {
  page-break-before: always;
}

/* ============================================
   LISTS
   ============================================ */
ul, ol {
  margin: 6px 0 12px 20px;
}

li {
  margin-bottom: 3px;
}

li > ul, li > ol {
  margin-top: 3px;
  margin-bottom: 3px;
}

/* ============================================
   CALLOUT / INFO BOX
   ============================================ */
.callout {
  background: var(--color-section-bg);
  border-left: 5px solid var(--color-accent);
  padding: 14px 18px;
  margin: 16px 0;
  border-radius: 0 var(--radius-default) var(--radius-default) 0;
  font-size: 9.5pt;
}

.callout.info {
  border-left-color: #3b82f6;
  background: #eff6ff;
}

.callout.warning {
  border-left-color: #f59e0b;
  background: #fefce8;
}

.callout.tip {
  border-left-color: #10b981;
  background: #ecfdf5;
}

.callout-title {
  font-weight: 700;
  font-size: 9.5pt;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ============================================
   TABLES
   ============================================ */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 9pt;
  border-radius: var(--radius-default);
  overflow: hidden;
}

th, td {
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  font-size: 8.5pt;
  letter-spacing: 0.8px;
}

tr:nth-child(even) {
  background: var(--color-section-bg);
}

/* ============================================
   CODE
   ============================================ */
code {
  font-family: var(--font-mono);
  font-size: 8.5pt;
  background: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: #7c3aed;
  border: 1px solid #eee;
}

pre {
  background: #1e1e2e;
  color: #cdd6f4;
  border: none;
  border-radius: 10px;
  padding: 16px 24px;
  overflow-x: auto;
  margin: 16px 0;
  font-size: 8.5pt;
  line-height: 1.5;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
  position: relative;
}

pre::before {
  content: "CODE";
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-sans);
  font-size: 6.5pt;
  letter-spacing: 1.5px;
  color: rgba(205, 214, 244, 0.3);
  padding: 4px 12px;
  font-weight: 600;
}

pre code {
  background: none;
  padding: 0;
  color: #cdd6f4;
  border: none;
  font-size: 8.5pt;
}

/* ============================================
   LINKS
   ============================================ */
a {
  color: var(--color-link);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-link);
  transition: color 0.2s ease, border-bottom-color 0.2s ease;
}

a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  border-bottom-style: solid;
}

@media print {
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 7.5pt;
    color: var(--color-text-light);
    word-break: break-all;
  }
  a[href^="#"]::after {
    content: "";
  }
}

/* ============================================
   STEPS / PROCEDURE
   ============================================ */
.steps {
  counter-reset: step-counter;
  list-style: none;
  margin-left: 0;
  padding-left: 0;
}

.steps li {
  counter-increment: step-counter;
  padding: 8px 14px 8px 36px;
  position: relative;
  margin-bottom: 4px;
  background: none;
  border-radius: 0;
  border: none;
  border-bottom: 1px solid var(--color-border);
  font-size: 9.5pt;
}

.steps li:last-child {
  border-bottom: none;
}

.steps li::before {
  content: counter(step-counter) ".";
  position: absolute;
  left: 8px;
  top: 8px;
  font-weight: 600;
  font-size: 9pt;
  color: var(--color-text-light);
}

/* ============================================
   TAG / BADGE
   ============================================ */
.tag {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 8pt;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 12px;
  margin-right: 4px;
  vertical-align: middle;
}

.tag.blue {
  background: #dbeafe;
  color: #1d4ed8;
}

.tag.green {
  background: #d1fae5;
  color: #047857;
}

.tag.purple {
  background: #ede9fe;
  color: #6d28d9;
}

/* ============================================
   TASK / ASSIGNMENT BOX
   ============================================ */
.task-box {
  border: 2.5px solid var(--color-accent);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 28px 0;
  background: linear-gradient(135deg, #eff6ff 0%, #fff 100%);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.1);
  position: relative;
}

.task-box::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 20px;
  right: 20px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 0 0 3px 3px;
}

.task-box h3 {
  color: var(--color-accent);
  margin-top: 0;
  font-size: 11pt;
}

.task-box ul {
  margin-bottom: 8px;
}

/* ============================================
   TWO COLUMN LAYOUT
   ============================================ */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 12px 0;
}

.two-col > div {
  padding: 14px 16px;
  background: var(--color-section-bg);
  border-radius: var(--radius-default);
  border: 1px solid var(--color-border);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

@media screen {
  .two-col > div:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
  }
}

@media print {
  .two-col {
    grid-template-columns: 1fr 1fr;
  }

  .two-col > div {
    box-shadow: none;
    transform: none;
  }
}

/* ============================================
   REFERENCE CASE CARDS
   ============================================ */
.ref-case {
  background: linear-gradient(135deg, #f8fafc 0%, #fff 100%);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-link);
  border-radius: 0 var(--radius-default) var(--radius-default) 0;
  padding: 12px 16px;
  margin: 12px 0;
  font-size: 9.5pt;
  transition: box-shadow 0.25s ease;
}

@media screen {
  .ref-case:hover {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  }
}

.ref-case p {
  margin-bottom: 4px;
}

.ref-case p:last-child {
  margin-bottom: 0;
}

.ref-label {
  font-size: 8pt;
  font-weight: 700;
  color: var(--color-link);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

/* ============================================
   APPENDIX
   ============================================ */
.appendix {
  margin-top: 28px;
  padding-top: 14px;
  border-top: 1.5px dashed var(--color-border);
}

.appendix h2 {
  color: var(--color-text-light);
  background: var(--color-section-bg);
  border-left-color: var(--color-border);
  font-size: 12pt;
}

/* appendix h2 has no ::after since h2::after was removed */

/* ============================================
   CATEGORY SECTIONS (Appendix field cards)
   ============================================ */
.category-section {
  margin: 32px 0;
  padding: 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-top: 5px solid var(--color-border);
  border-radius: var(--radius-default);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.category-section .category-header h2 {
  margin-top: 0;
  margin-bottom: 0;
  background: transparent;
  border-left: none;
  border-radius: 0;
  padding: 16px 20px;
}

/* category h2 has no ::after since h2::after was removed */

/* Category border-top accents (base styles, overridable by inline CSS) */
.category-section.cat-a { border-top-color: var(--color-cat-a); }
.category-section.cat-b { border-top-color: var(--color-cat-b); }
.category-section.cat-c { border-top-color: var(--color-cat-c); }
.category-section.cat-d { border-top-color: var(--color-cat-d); }
.category-section.cat-e { border-top-color: var(--color-cat-e); }

/* ============================================
   FOOTER
   ============================================ */
.doc-footer {
  margin-top: 36px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
  font-size: 7.5pt;
  color: var(--color-text-light);
  text-align: center;
  line-height: 1.6;
}

/* ============================================
   PRINT SPECIFICS
   ============================================ */
@media print {
  body {
    padding: 0;
    box-shadow: none;
    margin: 0;
    max-width: none;
    background: #fff;
  }

  .no-print {
    display: none !important;
  }

  h2, h3, h4 {
    page-break-after: avoid;
  }

  table, pre, .callout, .task-box, .steps li {
    page-break-inside: avoid;
  }

  .two-col {
    page-break-inside: avoid;
  }

  img {
    max-width: 100%;
  }

  /* Remove screen-only decorative effects for clean print */
  .doc-body {
    box-shadow: none;
    border-radius: 0;
    background: #fff;
  }

  .doc-body::before {
    display: none;
  }

  .task-box {
    box-shadow: none;
  }

  .task-box::before {
    display: none;
  }

  .category-section {
    box-shadow: none;
    border-top-width: 5px;
  }

  pre {
    box-shadow: none;
  }

  pre::before {
    display: none;
  }

  .doc-header {
    margin: 0 0 14px 0;
    padding: 20px 24px;
    border-radius: 0;
  }

  .doc-header::after {
    display: none;
  }
}

/* ============================================
   UTILITIES
   ============================================ */
.text-center { text-align: center; }
.text-small { font-size: 9pt; }
.text-muted { color: var(--color-text-light); }
.text-accent { color: var(--color-accent); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.bold { font-weight: 700; }
.nowrap { white-space: nowrap; }

/* ============================================
   PAGE BREAK — legacy (for non-paged layouts)
   ============================================ */
@media screen {
  section.page-break {
    position: relative;
    margin-top: 48px;
    padding-top: 32px;
  }

  section.page-break::before {
    content: "";
    position: absolute;
    top: 12px;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-border);
  }
}

/* ============================================
   PAGED LAYOUT — Strict A4 page containers
   ============================================
   Each .page is exactly one A4 page (210×297mm).
   Content MUST fit within the page's content area.
   Screen: A4-sized paper sheets stacked vertically.
   Print : Each .page starts on a new physical page.
   ============================================ */

/* --- doc-body becomes transparent when paged --- */
@media screen {
  .doc-body.paged {
    background: transparent !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    padding: 32px 0 !important;
    max-width: none !important;
  }

  .doc-body.paged::before {
    display: none !important;
  }
}

@media print {
  .doc-body.paged {
    padding: 0;
  }
}

/* --- Individual A4 page --- */
.page {
  box-sizing: border-box;
}

@media screen {
  .page {
    /* Strict A4 dimensions @ 96 DPI */
    width: 794px;           /* 210mm */
    height: 1123px;         /* 297mm */
    /* Margins matching @page rule: 18mm 16mm 22mm 16mm */
    padding: 68px 60px 83px 60px;
    margin: 0 auto 32px;
    background: var(--color-paper);
    border-radius: 0;
    box-shadow:
      0 4px 24px rgba(0, 0, 0, 0.12),
      0 1px 4px rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
    /* Create stacking context so ::before z-index:-1 stays within page,
       and children don't need z-index (which can break border-radius clipping) */
    isolation: isolate;
  }

  /* Paper grain texture */
  .page::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.015'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: -1;
  }

  .page > * {
    position: relative;
  }
}

@media print {
  .page {
    page-break-before: always;
    padding: 0;
  }

  .page:first-child {
    page-break-before: auto;
  }
}

/* --- Heading styles reset inside .page (no extra top margin on first heading) --- */
.page > h2:first-child,
.page > section:first-child > h2:first-child,
.page > section:first-child > h3:first-child,
.page > section:first-child > .callout:first-child,
/* When doc-header is first child, section becomes second child — also reset */
.page > .doc-header + section > h2:first-child {
  margin-top: 0;
}

/* .page > header.doc-header specificity override removed —
   base .doc-header already has the same negative margins,
   and the higher specificity was preventing the @media print reset. */

/* --- Appendix at top of page: remove unnecessary separator --- */
.page > .appendix:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}