:root {
  --bg: #f6efe6;
  --bg-alt: #fffaf3;
  --ink: #12263a;
  --muted: #56697f;
  --line: rgba(18, 38, 58, 0.12);
  --accent: #eb5e28;
  --accent-dark: #bf3f13;
  --accent-soft: #ffd9c8;
  --teal: #1f7a8c;
  --teal-soft: #d8f0f4;
  --lime: #9ccf31;
  --card-shadow: 0 20px 50px rgba(18, 38, 58, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --font-ui: "Segoe UI Variable", "Yu Gothic UI", "Hiragino Kaku Gothic ProN", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-ui);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(156, 207, 49, 0.2), transparent 28%),
    radial-gradient(circle at top right, rgba(31, 122, 140, 0.18), transparent 32%),
    linear-gradient(180deg, #fff8ef 0%, #f4eee5 100%);
}

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

button,
input {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  backdrop-filter: blur(16px);
  background: rgba(255, 248, 239, 0.78);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.site-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
}

.site-nav a[aria-current="page"] {
  color: #fff;
  background: var(--ink);
}

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.home-shell {
  padding-top: 40px;
}

.hero-card,
.feature-card,
.workflow-card,
.status-card,
.practice-card,
.problem-card,
.prompt-card,
.feedback-card,
.answer-card,
.complete-card,
.notice {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.95);
  box-shadow: var(--card-shadow);
}

.hero-card {
  position: relative;
  overflow: hidden;
  padding: 40px;
  border-radius: var(--radius-xl);
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: auto -40px -60px auto;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(235, 94, 40, 0.28) 0%, rgba(235, 94, 40, 0) 72%);
}

.eyebrow,
.workflow-step,
.prompt-kicker {
  margin: 0 0 10px;
  color: var(--teal);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 16px;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.05;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(1.3rem, 2vw, 2rem);
}

.hero-copy,
.page-intro p,
.feature-card p,
.workflow-card p,
.problem-card p,
.status-card,
.feedback-row strong,
.support-note {
  color: var(--muted);
  line-height: 1.7;
}

.hero-actions,
.control-row,
.manual-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button,
.text-button {
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  border: 0;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
}

.button-secondary {
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
}

.text-button {
  padding: 0;
  border: 0;
  color: var(--teal);
  background: transparent;
  font-weight: 700;
  cursor: pointer;
}

.support-note {
  margin-top: 22px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-alt);
  border: 1px solid var(--line);
}

.grid-two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.feature-card,
.problem-card,
.status-card,
.practice-card,
.complete-card,
.feedback-card,
.answer-card,
.notice {
  border-radius: var(--radius-lg);
}

.feature-card,
.problem-card {
  padding: 28px;
}

.feature-list {
  margin: 0;
  padding-left: 20px;
  color: var(--ink);
  line-height: 1.9;
}

.ordered-list {
  padding-left: 24px;
}

.workflow-card {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
  padding: 28px;
  border-radius: var(--radius-xl);
}

.page-intro {
  margin-bottom: 24px;
}

.page-intro.compact {
  margin-bottom: 16px;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.problem-card {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.tag-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 7px 11px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--teal);
  background: var(--teal-soft);
}

.practice-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 20px;
}

.practice-layout-phone {
  grid-template-columns: minmax(320px, 410px) minmax(0, 1fr);
  align-items: start;
}

.phone-stage {
  display: flex;
  justify-content: center;
}

.phone-shell {
  position: sticky;
  top: 96px;
  width: min(100%, 390px);
  min-height: 760px;
  padding: 0 18px 28px;
  border: 2px solid rgba(18, 38, 58, 0.35);
  border-radius: 42px;
  background: #fff;
  box-shadow: 0 26px 60px rgba(18, 38, 58, 0.18);
  overflow: hidden;
}

.phone-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin: 0 -18px 18px;
  padding: 16px 28px 34px;
  color: #fff;
  background: linear-gradient(180deg, #8ccff5 0%, #92c9ea 100%);
  border-bottom-left-radius: 50% 18%;
  border-bottom-right-radius: 50% 18%;
}

.phone-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: 2rem;
  line-height: 1;
}

.phone-title {
  text-align: center;
}

.phone-title strong {
  display: block;
  font-size: 1.8rem;
  line-height: 1;
}

.phone-title span {
  display: block;
  margin-top: 8px;
  font-size: 1.6rem;
  font-weight: 700;
}

.conversation-viewport {
  height: 660px;
  overflow-y: auto;
  padding: 12px 6px 24px;
  scrollbar-width: none;
}

.conversation-viewport::-webkit-scrollbar {
  display: none;
}

.conversation-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.conversation-item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 12px;
  align-items: flex-start;
  padding: 10px 0;
  opacity: 0.78;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.conversation-item + .conversation-item {
  margin-top: 14px;
}

.conversation-item.done,
.conversation-item.active,
.conversation-item.revealed {
  opacity: 1;
}

.conversation-item.active,
.conversation-item.revealed {
  transform: translateX(6px);
}

.conversation-dot {
  width: 14px;
  height: 14px;
  margin-top: 10px;
  border-radius: 50%;
  background: #d8dbe1;
  box-shadow: inset 0 0 0 2px rgba(18, 38, 58, 0.04);
}

.conversation-item.done .conversation-dot {
  background: var(--lime);
}

.conversation-item.revealed .conversation-dot {
  background: #f0b44c;
}

.conversation-copy {
  min-width: 0;
}

.conversation-ja,
.conversation-en {
  margin: 0;
}

.conversation-ja {
  font-size: clamp(1.3rem, 2.2vw, 2rem);
  line-height: 1.8;
  font-weight: 500;
  color: var(--ink);
}

.conversation-en {
  margin-top: 6px;
  font-size: clamp(1rem, 1.4vw, 1.35rem);
  line-height: 1.5;
  font-weight: 800;
  color: #111;
}

.conversation-item.pending .conversation-ja {
  color: rgba(18, 38, 58, 0.9);
}

.conversation-item.active .conversation-copy,
.conversation-item.revealed .conversation-copy {
  animation: currentLinePulse 2.4s ease-in-out infinite;
}

.coach-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.coach-card {
  padding: 24px;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.control-stack {
  margin-top: 22px;
}

.control-stack .control-row + .control-row {
  margin-top: 12px;
}

.coach-panel .manual-form {
  margin: 0;
  padding: 24px;
}

.coach-panel .feedback-card,
.coach-panel .answer-card,
.coach-panel .complete-card {
  margin: 0;
}

@keyframes currentLinePulse {
  0%,
  100% {
    transform: translateX(0);
  }
  50% {
    transform: translateX(4px);
  }
}

.status-card,
.practice-card {
  padding: 24px;
}

.status-card {
  height: fit-content;
}

.status-block + .status-block {
  margin-top: 18px;
}

.label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.status-link {
  width: 100%;
  margin-top: 24px;
}

.notice {
  margin-bottom: 18px;
  padding: 16px 18px;
  border-left: 6px solid var(--accent);
}

.hidden {
  display: none !important;
}

.prompt-card {
  overflow: hidden;
  margin-bottom: 18px;
  padding: 20px;
}

.prompt-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.prompt-viewport {
  height: 190px;
  overflow-y: auto;
  padding: 0 12px;
  border-radius: var(--radius-md);
  background:
    linear-gradient(180deg, rgba(255, 248, 239, 0.95) 0%, rgba(255, 255, 255, 0.95) 100%);
  border: 1px solid var(--line);
  scrollbar-width: none;
}

.prompt-viewport::-webkit-scrollbar {
  display: none;
}

.prompt-spacer {
  height: 110px;
}

.prompt-text {
  margin: 0;
  padding: 18px 12px;
  font-size: clamp(1.6rem, 3.2vw, 2.7rem);
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
}

.manual-form {
  margin-top: 18px;
  margin-bottom: 18px;
}

.manual-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.manual-input {
  flex: 1 1 280px;
  min-height: 48px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
}

.feedback-card,
.answer-card,
.complete-card {
  padding: 20px;
}

.feedback-row + .feedback-row {
  margin-top: 18px;
}

.answer-card {
  background: linear-gradient(135deg, rgba(255, 217, 200, 0.8), rgba(255, 255, 255, 0.9));
}

.complete-card {
  margin-top: 18px;
}

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

@media (max-width: 940px) {
  .grid-two,
  .workflow-card,
  .problem-grid,
  .practice-layout {
    grid-template-columns: 1fr;
  }

  .practice-layout {
    gap: 16px;
  }

  .phone-shell {
    position: static;
    min-height: auto;
  }

  .conversation-viewport {
    height: 520px;
  }
}

@media (max-width: 640px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-shell {
    width: min(100% - 20px, 1120px);
    padding-top: 24px;
  }

  .hero-card,
  .feature-card,
  .workflow-card,
  .status-card,
  .practice-card,
  .problem-card {
    padding: 20px;
  }

  .prompt-viewport {
    height: 170px;
  }

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

  .conversation-viewport {
    height: 480px;
  }

  .phone-title strong {
    font-size: 1.5rem;
  }

  .phone-title span {
    font-size: 1.25rem;
  }
}