/* =====================================================
   Dialogue Theater — いのちのあかし — Epilogue Interface
   styles.css
   Dark, quiet, mobile-first design
   ===================================================== */

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

:root {
  --color-bg:          #0e0e0e;
  --color-surface:     #161616;
  --color-border:      #2a2a2a;
  --color-text:        #d4d0c8;
  --color-text-muted:  #6e6a62;
  --color-text-faint:  #3a3832;
  --color-accent:      #b8a98a;
  --color-accent-dim:  #7a6e58;
  --color-error:       #c07070;
  --color-focus:       #b8a98a;

  --font-ja:           "Hiragino Mincho ProN", "Yu Mincho", "YuMincho",
                       "Noto Serif JP", serif;
  --font-size-base:    1.0625rem;  /* 17px */
  --font-size-sm:      0.875rem;
  --font-size-lg:      1.25rem;
  --font-size-xl:      1.625rem;

  --line-height-base:  1.8;
  --line-height-tight: 1.4;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.75rem;
  --space-lg:  3rem;
  --space-xl:  5rem;

  --radius:    4px;
  --transition: 0.3s ease;
  --transition-step: 0.8s ease;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-ja);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ----- Focus styles ----- */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius);
}

/* =====================================================
   Layout
   ===================================================== */

.page {
  flex: 1;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-xl);
}

.page-footer {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md) var(--space-md);
  border-top: 1px solid var(--color-border);
}

.page-footer__text {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  letter-spacing: 0.05em;
}

/* =====================================================
   Sections (state views)
   ===================================================== */

.section[hidden] {
  display: none;
}

.section.is-leaving {
  animation-name: fadeOut;
  animation-duration: 0.8s;
  animation-timing-function: ease;
  animation-fill-mode: forwards;
}

.section.is-entering {
  animation-name: fadeIn;
  animation-duration: 0.8s;
  animation-timing-function: ease;
  animation-fill-mode: both;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-8px); }
}

/* =====================================================
   Page header
   ===================================================== */

.page-header {
  margin-bottom: var(--space-lg);
}

.page-label {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  letter-spacing: 0.12em;
  margin-bottom: var(--space-sm);
}

.page-title {
  color: var(--color-text);
  font-size: var(--font-size-xl);
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: 0.04em;
  word-break: keep-all;
  overflow-wrap: break-word;
}

/* =====================================================
   Step layouts
   ===================================================== */

.section--step1,
.section--step2 {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 70vh;
}

.step-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.step2-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

/* =====================================================
   Field
   ===================================================== */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.field__label {
  color: var(--color-text);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  cursor: pointer;
}

.field__textarea {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-ja);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  padding: var(--space-sm);
  resize: vertical;
  transition: border-color var(--transition);
  width: 100%;
  min-height: 110px;
}

.field__textarea::placeholder {
  color: var(--color-text-faint);
}

.field__textarea:focus {
  border-color: var(--color-accent-dim);
  outline: none;
  box-shadow: 0 0 0 2px rgba(184, 169, 138, 0.2);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-accent) 20%, transparent);
}

.field__hint {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  min-height: 1.2em;
}

/* ----- Error message in form ----- */

.form__error {
  background-color: rgba(192, 112, 112, 0.1);
  background-color: color-mix(in srgb, var(--color-error) 10%, transparent);
  border-left: 3px solid var(--color-error);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-error);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-base);
  padding: var(--space-xs) var(--space-sm);
}

.form__error[hidden] {
  display: none;
}

/* =====================================================
   Buttons
   ===================================================== */

/* ----- Primary action (next / submit) ----- */

.btn-next {
  align-items: center;
  background-color: transparent;
  border: 1px solid var(--color-accent-dim);
  border-radius: var(--radius);
  color: var(--color-accent);
  cursor: pointer;
  display: flex;
  font-family: var(--font-ja);
  font-size: var(--font-size-base);
  justify-content: center;
  letter-spacing: 0.12em;
  min-height: 60px;
  padding: var(--space-md) var(--space-md);
  transition: background-color var(--transition), color var(--transition),
              border-color var(--transition), opacity var(--transition);
  width: 100%;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-next:hover:not(:disabled) {
  background-color: rgba(184, 169, 138, 0.1);
  background-color: color-mix(in srgb, var(--color-accent) 10%, transparent);
  border-color: var(--color-accent);
}

.btn-next:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

/* ----- Skip (secondary) ----- */

.btn-skip {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-family: var(--font-ja);
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  min-height: 48px;
  padding: var(--space-sm) var(--space-sm);
  text-align: center;
  transition: color var(--transition);
  width: 100%;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-skip:hover,
.btn-skip:focus-visible {
  color: var(--color-accent-dim);
}

/* ----- Retry ----- */

.btn-retry {
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  cursor: pointer;
  font-family: var(--font-ja);
  font-size: var(--font-size-sm);
  letter-spacing: 0.1em;
  min-height: 52px;
  padding: var(--space-sm) var(--space-md);
  transition: color var(--transition), border-color var(--transition);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-retry:hover,
.btn-retry:focus-visible {
  border-color: var(--color-accent-dim);
  color: var(--color-accent);
}

/* =====================================================
   Submitting state — poetic
   ===================================================== */

.section--submitting {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  min-height: 60vh;
  text-align: center;
  position: relative;
}

.submitting-glow {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent-dim) 0%, transparent 70%);
  opacity: 0.3;
  animation: breathe 4s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { transform: scale(0.8); opacity: 0.2; }
  50%      { transform: scale(1.2); opacity: 0.4; }
}

.submitting-poetry__line {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  letter-spacing: 0.1em;
  line-height: 1.8;
  transition: opacity 0.6s ease;
}

/* =====================================================
   Submitted state — lingering
   ===================================================== */

.section--submitted {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  min-height: 60vh;
  text-align: center;
  padding: var(--space-lg) 0;
  position: relative;
}

.submitted-glow {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
  opacity: 0;
  animation: glowAppear 3s ease 0.5s forwards;
}

@keyframes glowAppear {
  0%   { opacity: 0; transform: scale(0.5); }
  100% { opacity: 0.25; transform: scale(1); }
}

.submitted-message {
  color: var(--color-text);
  font-size: var(--font-size-lg);
  line-height: 1.7;
  max-width: 24em;
  opacity: 0;
  animation: slowReveal 2s ease 0.8s forwards;
}

.submitted-sub {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  letter-spacing: 0.1em;
  opacity: 0;
  animation: slowReveal 2s ease 2s forwards;
}

@keyframes slowReveal {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =====================================================
   Error state
   ===================================================== */

.section--error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  min-height: 60vh;
  text-align: center;
  padding: var(--space-lg) 0;
}

.error-message {
  color: var(--color-text);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  max-width: 24em;
}

.error-sub {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* =====================================================
   Step 1 introduction
   ===================================================== */

.step1-intro {
  margin-bottom: var(--space-md);
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  line-height: 2;
  letter-spacing: 0.04em;
}

.step1-intro p {
  margin-bottom: var(--space-sm);
}

.step1-intro p:last-child {
  margin-bottom: 0;
}

.intro-emphasis {
  color: var(--color-accent);
  font-style: normal;
}

/* =====================================================
   Full version invitation (in submitted screen)
   ===================================================== */

.submitted-invite {
  opacity: 0;
  animation-name: slowReveal;
  animation-duration: 2s;
  animation-timing-function: ease;
  animation-delay: 3.5s;
  animation-fill-mode: forwards;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.submitted-invite__text {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  letter-spacing: 0.06em;
  text-align: center;
}

.submitted-invite__btn {
  max-width: 320px;
}

/* =====================================================
   Full version sections
   ===================================================== */

.section--full {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  min-height: auto;
  padding-top: var(--space-lg);
}

.section--full .step-body {
  gap: var(--space-lg);
}

.full-step-label {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  letter-spacing: 0.12em;
}

/* ----- Step navigation (next + back) ----- */

.step-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

.btn-back {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-family: var(--font-ja);
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  min-height: 48px;
  padding: var(--space-xs) var(--space-sm);
  transition: color var(--transition);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-back:hover,
.btn-back:focus-visible {
  color: var(--color-accent-dim);
}

/* =====================================================
   Radio & checkbox groups
   ===================================================== */

.field--radio-group,
.field--checkbox-group {
  border: none;
  padding: 0;
}

.radio-group,
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.radio-item,
.checkbox-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  min-height: 48px;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--transition), background-color var(--transition);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.radio-item:hover,
.checkbox-item:hover {
  border-color: var(--color-accent-dim);
}

.radio-item.is-selected,
.checkbox-item.is-selected {
  border-color: var(--color-accent);
  background-color: rgba(184, 169, 138, 0.08);
  background-color: color-mix(in srgb, var(--color-accent) 8%, transparent);
}

/* Custom radio / checkbox inputs */
.radio-item input,
.checkbox-item input {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  flex-shrink: 0;
  transition: border-color var(--transition), background-color var(--transition);
  position: relative;
  cursor: pointer;
}

.checkbox-item input {
  border-radius: var(--radius);
}

.radio-item input:checked,
.checkbox-item input:checked {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
}

.radio-item input:checked::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-bg);
}

.checkbox-item input:checked::after {
  content: '';
  position: absolute;
  top: 45%;
  left: 50%;
  width: 10px;
  height: 6px;
  border-left: 2px solid var(--color-bg);
  border-bottom: 2px solid var(--color-bg);
  transform: translate(-50%, -50%) rotate(-45deg);
}

.radio-item__text,
.checkbox-item__text {
  color: var(--color-text);
  font-size: var(--font-size-base);
  line-height: var(--line-height-tight);
}

/* =====================================================
   Conditional fields
   ===================================================== */

.conditional-field {
  margin-top: var(--space-sm);
  padding-left: var(--space-sm);
  border-left: 2px solid var(--color-border);
}

.conditional-field[hidden] {
  display: none;
}

.field__textarea--short {
  min-height: 72px;
}

/* =====================================================
   Research consent
   ===================================================== */

.consent-text {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-base);
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.consent-check {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  min-height: 48px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.consent-check__input {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  flex-shrink: 0;
  transition: border-color var(--transition), background-color var(--transition);
  position: relative;
  cursor: pointer;
}

.consent-check__input:checked {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
}

.consent-check__input:checked::after {
  content: '';
  position: absolute;
  top: 45%;
  left: 50%;
  width: 12px;
  height: 7px;
  border-left: 2px solid var(--color-bg);
  border-bottom: 2px solid var(--color-bg);
  transform: translate(-50%, -50%) rotate(-45deg);
}

.consent-check__text {
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-base);
}

/* =====================================================
   Responsive adjustments
   ===================================================== */

@media (min-width: 480px) {
  :root {
    --font-size-xl: 1.875rem;
  }

  .page {
    padding-top: var(--space-xl);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}