/* ============================================================
   Ajiwau — Global Design System (Light Pastel Theme)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Serif+JP:wght@400;600;700&family=Playfair+Display:wght@700;800&display=swap');

/* --- Custom Properties --- */
:root {
  /* Backgrounds */
  --bg-primary: #fbf9ff;
  --bg-secondary: #f3f0fd;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.80);

  /* Accent — Soft Violet/Indigo palette */
  --accent-gold: #7c6df7;
  /* reused var name, now = soft violet */
  --accent-gold-light: #a594fa;
  --accent-gold-dim: rgba(124, 109, 247, 0.10);
  --accent-red: #f472b6;
  /* soft pink */
  --accent-sakura: #fb7185;
  /* rose */
  --accent-purple: #60a5fa;
  /* sky blue */
  --accent-teal: #34d399;
  /* mint */
  --accent-peach: #fb923c;
  /* warm peach */

  /* Text */
  --text-primary: #1e1b4b;
  --text-secondary: #6b688a;
  --text-muted: #a8a5c4;
  --text-gold: #7c6df7;

  /* Borders */
  --border-subtle: rgba(124, 109, 247, 0.18);
  --border-glass: rgba(124, 109, 247, 0.10);

  /* Shadows */
  --shadow-card: 0 2px 24px rgba(124, 109, 247, 0.08);
  --shadow-glow: 0 0 48px rgba(124, 109, 247, 0.14);
  --shadow-hover: 0 8px 40px rgba(124, 109, 247, 0.16);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 100px;

  /* Transitions */
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.45s cubic-bezier(0.4, 0, 0.2, 1);

  /* Fonts */
  --font-ui: 'Inter', sans-serif;
  --font-jp: 'Noto Sans JP', sans-serif;
  --font-jp-sans: 'Noto Sans JP', sans-serif;
  --font-jp-serif: 'Noto Serif JP', serif;
  --font-display: 'Playfair Display', serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ui);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Subtle gradient mesh background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 10%, rgba(167, 148, 250, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 80% 80%, rgba(251, 113, 133, 0.07) 0%, transparent 55%),
    radial-gradient(ellipse 40% 35% at 60% 30%, rgba(96, 165, 250, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
}

h3 {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

p {
  color: var(--text-secondary);
  line-height: 1.75;
}

a {
  color: var(--accent-gold);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-gold-light);
}

.text-gold {
  color: var(--accent-gold);
}

.text-jp {
  font-family: var(--font-jp);
}

.text-jp-sans {
  font-family: var(--font-jp-sans);
}

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

.text-secondary {
  color: var(--text-secondary);
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.badge-gold {
  background: rgba(124, 109, 247, 0.10);
  color: var(--accent-gold);
  border: 1px solid rgba(124, 109, 247, 0.22);
}

.badge-sakura {
  background: rgba(251, 113, 133, 0.10);
  color: var(--accent-sakura);
  border: 1px solid rgba(251, 113, 133, 0.22);
}

.badge-teal {
  background: rgba(52, 211, 153, 0.10);
  color: #059669;
  border: 1px solid rgba(52, 211, 153, 0.25);
}

.badge-blue {
  background: rgba(96, 165, 250, 0.10);
  color: #2563eb;
  border: 1px solid rgba(96, 165, 250, 0.22);
}

/* --- Glass Card --- */
.glass-card {
  background: var(--bg-glass);
  border: 1px solid rgba(124, 109, 247, 0.14);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 32px rgba(124, 109, 247, 0.08), 0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, #7c6df7 0%, #9b8ef9 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(124, 109, 247, 0.30);
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(105deg, transparent 40%, rgba(255, 255, 255, 0.22) 50%, transparent 60%);
  transition: left 0.55s ease;
}

.btn-primary:hover::after {
  left: 160%;
}

.btn-primary:hover {
  box-shadow: 0 8px 32px rgba(124, 109, 247, 0.45);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-ghost {
  background: rgba(124, 109, 247, 0.06);
  color: var(--text-secondary);
  border: 1px solid var(--border-glass);
}

.btn-ghost:hover {
  border-color: var(--border-subtle);
  color: var(--accent-gold);
  background: rgba(124, 109, 247, 0.10);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: rgba(124, 109, 247, 0.25);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(124, 109, 247, 0.45);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes shimmer {
  from {
    background-position: -200% center;
  }

  to {
    background-position: 200% center;
  }
}

@keyframes pulse-ring {
  0% {
    box-shadow: 0 0 0 0 rgba(124, 109, 247, 0.35);
  }

  70% {
    box-shadow: 0 0 0 10px rgba(124, 109, 247, 0);
  }

  100% {
    box-shadow: 0 0 0 0 rgba(124, 109, 247, 0);
  }
}

@keyframes float {

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

  50% {
    transform: translateY(-8px);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.animate-in {
  animation: fadeInUp 0.55s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.animate-in-delay-1 {
  animation-delay: 0.08s;
}

.animate-in-delay-2 {
  animation-delay: 0.16s;
}

.animate-in-delay-3 {
  animation-delay: 0.24s;
}

.animate-in-delay-4 {
  animation-delay: 0.32s;
}

.animate-in-delay-5 {
  animation-delay: 0.40s;
}

/* --- Shared Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 14px 0;
  background: rgba(251, 249, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-jp);
  font-size: 1.25rem;
  color: var(--accent-gold);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  line-height: 1;
  gap: 2px;
}

.nav-logo span {
  font-family: var(--font-ui);
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
/* ============================================================
   Responsive polish - shared rules
   ============================================================ */
html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

img,
svg,
video,
canvas {
  max-width: 100%;
}

:where(.lesson-section, .timeline-body-card, .question-card, .sidebar-card, .subchapter-card, .progress-banner, .review-popup-card) {
  min-width: 0;
}

.text-jp,
.text-jp-sans,
[lang="ja"],
.lesson-title-jp,
.card-title-jp,
.chapter-title-jp-inline,
.media-example-jp,
.timeline-highlight-jp,
.s-jp,
.example-jp {
  word-break: keep-all;
  overflow-wrap: anywhere;
  line-break: strict;
}

@media (max-width: 900px) {
  .container {
    padding-left: 20px;
    padding-right: 20px;
  }

  .nav {
    padding: 10px 0;
  }
}

@media (max-width: 640px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  body {
    font-size: 15px;
  }

  .btn {
    min-height: 44px;
    padding: 12px 18px;
    font-size: 0.9rem;
  }

  .nav-logo {
    font-size: 1.05rem;
  }

  .hero {
    min-height: 100svh !important;
    padding: 92px 16px 64px !important;
  }

  .hero-logo {
    font-size: clamp(3.25rem, 24vw, 5.2rem) !important;
  }

  .hero-name-en {
    letter-spacing: 0.22em !important;
    margin-bottom: 26px !important;
  }

  .hero-tagline {
    max-width: 100% !important;
  }

  .hero-tagline-jp {
    margin-bottom: 32px !important;
  }

  .hero-cta {
    width: min(100%, 360px) !important;
    margin-left: auto !important;
    margin-right: auto !important;
  }

  .hero-cta .btn {
    width: 100% !important;
  }

  .hero-features {
    margin-top: 42px !important;
    width: 100% !important;
    display: grid !important;
    grid-template-columns: 1fr !important;
  }

  .feature-pill {
    width: 100% !important;
    justify-content: center !important;
    white-space: normal !important;
    text-align: center !important;
  }

  .about-strip {
    padding: 64px 0 !important;
  }

  .about-card {
    padding: 24px 20px !important;
  }

  .glow-top,
  .glow-bottom {
    width: 420px !important;
    height: 420px !important;
  }

  .scroll-hint {
    display: none !important;
  }
}

@media (max-width: 380px) {
  .container {
    padding-left: 12px;
    padding-right: 12px;
  }

  .badge {
    font-size: 0.66rem;
    padding: 4px 10px;
  }
}