/* ==============================
   CSS Custom Properties
   ============================== */
:root {
  --color-primary: #ffffff;
  --color-primary-light: #f8fafc;
  --color-accent: #2563eb;
  --color-accent-light: #3b82f6;
  --color-success: #059669;
  --color-success-light: #10b981;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-surface: #ffffff;
  --color-surface-light: #f1f5f9;
  --color-border: #e2e8f0;
  --gradient-start: #f8fafc;
  --gradient-end: #eff6ff;

  --font-body: "Noto Sans JP", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --nav-height: 72px;
  --section-padding: 80px;
  --content-max-width: 1000px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition-base: 0.2s ease;
  --transition-smooth: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
}

body {
  font-family: var(--font-body);
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  background-attachment: fixed;
  color: var(--color-text);
  line-height: 1.8;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==============================
   Navigation
   ============================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  padding: 0 24px;
}

.nav__inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav__logo-icon {
  width: 32px;
  height: 32px;
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  gap: 4px;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-base);
}

.nav__link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.nav__link:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.nav__link.is-active {
  color: var(--color-accent);
  background: rgba(37, 99, 235, 0.1);
}

/* Mobile Menu Button */
.nav__mobile-btn {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: 8px;
}

.nav__mobile-icon {
  width: 28px;
  height: 28px;
}

.nav__mobile-icon--close {
  display: none;
}

.nav__mobile-btn[aria-expanded="true"] .nav__mobile-icon--menu {
  display: none;
}

.nav__mobile-btn[aria-expanded="true"] .nav__mobile-icon--close {
  display: block;
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  padding: 24px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
  animation: slideIn 0.3s ease;
}

.mobile-menu.is-open {
  display: flex;
}

.mobile-menu__link {
  display: block;
  padding: 16px;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: 8px;
  transition: all var(--transition-base);
}

.mobile-menu__link:hover,
.mobile-menu__link:focus-visible {
  color: var(--color-text);
  background: var(--color-surface);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==============================
   Main Content
   ============================== */
.main {
  padding-top: var(--nav-height);
}

.section {
  padding: var(--section-padding) 24px;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.section__title {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section__subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 48px;
}

/* ==============================
   Hero Section
   ============================== */
.hero {
  text-align: center;
  padding: 120px 24px;
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(37, 99, 235, 0.08) 0%, transparent 50%);
  animation: heroPulse 10s ease-in-out infinite;
  pointer-events: none;
}

@keyframes heroPulse {

  0%,
  100% {
    transform: scale(1);
    opacity: 0.5;
  }

  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__icon {
  width: 100px;
  height: 100px;
  margin: 0 auto 32px;
  color: var(--color-accent);
  animation: heroFloat 3s ease-in-out infinite;
}

.hero__icon svg {
  width: 100%;
  height: 100%;
}

@keyframes heroFloat {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

.hero__title {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 24px;
  line-height: 1.2;
}

.hero__title-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-success) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__description {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero__stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.hero__stat {
  text-align: center;
}

.hero__stat-value {
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-accent);
}

.hero__stat-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ==============================
   Principles Grid
   ============================== */
.principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.principle {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  transition: all var(--transition-smooth);
}

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

.principle__number {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-success) 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.principle__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.principle__desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ==============================
   Card Component
   ============================== */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 24px;
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  transition: all var(--transition-smooth);
}

.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(37, 99, 235, 0.1);
}

.card--warning {
  background: linear-gradient(135deg, rgba(220, 38, 38, 0.05) 0%, rgba(217, 119, 6, 0.05) 100%);
  border-color: var(--color-warning);
}

.card--action {
  position: relative;
  overflow: hidden;
}

.card__action-number {
  position: absolute;
  top: -20px;
  right: -10px;
  font-size: 8rem;
  font-weight: 900;
  color: rgba(37, 99, 235, 0.08);
  line-height: 1;
  pointer-events: none;
}

.card__header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.card__icon {
  width: 48px;
  height: 48px;
  padding: 12px;
  background: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  flex-shrink: 0;
}

.card__icon svg {
  width: 100%;
  height: 100%;
}

.card__title {
  font-size: 1.5rem;
  font-weight: 700;
}

.card__body {
  color: var(--color-text-muted);
}

.card__body p {
  margin-bottom: 16px;
}

.card__body h4 {
  color: var(--color-text);
  margin: 20px 0 12px;
  font-weight: 600;
}

/* Card Badges */
.card__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.card__badge--priority {
  background: rgba(220, 38, 38, 0.1);
  color: var(--color-danger);
}

.card__badge--required {
  background: rgba(5, 150, 105, 0.1);
  color: var(--color-success);
}

.card__badge--basic {
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-accent);
}

.card__badge--recommended {
  background: rgba(217, 119, 6, 0.1);
  color: var(--color-warning);
}

.card__badge--continuous {
  background: rgba(100, 116, 139, 0.1);
  color: var(--color-text-muted);
}

/* Myth Header */
.myth-header {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-warning);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.myth-header svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

/* ==============================
   Check List
   ============================== */
.check-list {
  list-style: none;
  margin: 16px 0;
}

.check-list li {
  padding: 8px 0 8px 28px;
  position: relative;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: bold;
}

.check-list--warning li::before {
  content: "✗";
  color: var(--color-danger);
}

/* ==============================
   Highlight Box
   ============================== */
.highlight {
  padding: 20px 24px;
  border-radius: 0 8px 8px 0;
  margin: 20px 0;
  border-left: 4px solid;
}

.highlight--info {
  background: rgba(37, 99, 235, 0.06);
  border-left-color: var(--color-accent);
}

.highlight--warning {
  background: rgba(217, 119, 6, 0.06);
  border-left-color: var(--color-warning);
}

.highlight--success {
  background: rgba(5, 150, 105, 0.06);
  border-left-color: var(--color-success);
}

.highlight--danger {
  background: rgba(220, 38, 38, 0.06);
  border-left-color: var(--color-danger);
}

/* ==============================
   Accordion
   ============================== */
.accordion {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}

.accordion__header {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: background var(--transition-base);
}

.accordion__header:hover {
  background: var(--color-surface-light);
}

.accordion__header:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.accordion__icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transition: transform var(--transition-smooth);
}

.accordion.is-open .accordion__icon {
  transform: rotate(180deg);
}

.accordion__content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--transition-smooth);
}

.accordion.is-open .accordion__content {
  grid-template-rows: 1fr;
}

.accordion__inner {
  overflow: hidden;
  padding: 0 24px;
}

.accordion.is-open .accordion__inner {
  padding: 0 24px 24px;
}

.accordion__inner h4 {
  color: var(--color-text);
  margin: 16px 0 8px;
  font-size: 1rem;
}

.accordion__inner ul,
.accordion__inner ol {
  padding-left: 20px;
  color: var(--color-text-muted);
}

.accordion__inner li {
  margin: 8px 0;
}

.accordion__inner code {
  font-family: var(--font-mono);
  background: var(--color-surface-light);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ==============================
   Schedule Table
   ============================== */
.schedule-table-wrapper {
  overflow-x: auto;
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}

.schedule-table th,
.schedule-table td {
  padding: 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.schedule-table th {
  background: var(--color-surface-light);
  font-weight: 600;
  color: var(--color-accent-light);
}

.schedule-table tr:hover td {
  background: rgba(241, 245, 249, 0.7);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge--weekly {
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-accent);
}

.badge--monthly {
  background: rgba(5, 150, 105, 0.1);
  color: var(--color-success);
}

.badge--quarterly {
  background: rgba(217, 119, 6, 0.1);
  color: var(--color-warning);
}

/* ==============================
   Checklist Section
   ============================== */
.checklist-phase {
  margin-bottom: 40px;
}

.checklist-phase__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.checklist-phase__title {
  font-size: 1.5rem;
  font-weight: 700;
}

.checklist-phase__badge {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.checklist-phase__badge--urgent {
  background: rgba(220, 38, 38, 0.1);
  color: var(--color-danger);
}

.checklist-phase__badge--week {
  background: rgba(217, 119, 6, 0.1);
  color: var(--color-warning);
}

/* Progress Bar */
.progress {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.progress__bar {
  flex: 1;
  height: 8px;
  background: var(--color-surface-light);
  border-radius: 4px;
  overflow: hidden;
}

.progress__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-success) 100%);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.progress__text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* Checklist Group */
.checklist-group {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  border: 1px solid var(--color-border);
}

.checklist-group__title {
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

/* Checklist Item */
.checklist-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  cursor: pointer;
  transition: color var(--transition-base);
}

.checklist-item:hover {
  color: var(--color-accent-light);
}

.checklist-item__box {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  flex-shrink: 0;
  position: relative;
}

.checklist-item__box::after {
  content: "";
  display: none;
  width: 12px;
  height: 12px;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolyline points='20,6 9,17 4,12'/%3E%3C/svg%3E") center / contain no-repeat;
}

.checklist-item__input:checked~.checklist-item__box {
  background: var(--color-success);
  border-color: var(--color-success);
}

.checklist-item__input:checked~.checklist-item__box::after {
  display: block;
}

.checklist-item__input:focus-visible~.checklist-item__box {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.checklist-item__input:checked~.checklist-item__label {
  text-decoration: line-through;
  color: var(--color-text-muted);
}

.checklist-item__label {
  transition: all var(--transition-base);
}

/* ==============================
   Resources
   ============================== */
.resources__category {
  margin-bottom: 32px;
}

.resources__category-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.resources__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.resources__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--color-surface);
  border-radius: 10px;
  color: var(--color-text);
  text-decoration: none;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.resources__link:hover {
  border-color: var(--color-accent);
  background: var(--color-surface-light);
}

.resources__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.resources__link svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.resources__link span {
  flex: 1;
}

/* ==============================
   Footer
   ============================== */
.footer {
  background: var(--color-surface-light);
  border-top: 1px solid var(--color-border);
  padding: 48px 24px;
  text-align: center;
  color: var(--color-text-muted);
}

.footer__content {
  max-width: 600px;
  margin: 0 auto;
}

.footer__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer__logo svg {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
}

/* ==============================
   Responsive
   ============================== */
@media (max-width: 768px) {
  :root {
    --section-padding: 60px;
  }

  .nav__links {
    display: none;
  }

  .nav__mobile-btn {
    display: block;
  }

  .hero {
    padding: 80px 16px;
  }

  .hero__title {
    font-size: 2.25rem;
  }

  .hero__stats {
    gap: 32px;
  }

  .hero__stat-value {
    font-size: 2.25rem;
  }

  .section {
    padding: var(--section-padding) 16px;
  }

  .section__title {
    font-size: 1.75rem;
  }

  .card {
    padding: 24px;
  }

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

  .checklist-phase__header {
    flex-direction: column;
    align-items: flex-start;
  }

  .schedule-table th,
  .schedule-table td {
    padding: 12px 8px;
    font-size: 0.9rem;
  }

  .mobile-menu__link {
    min-height: 48px;
    display: flex;
    align-items: center;
  }
}

/* ==============================
   Focus Visible (Accessibility)
   ============================== */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}