.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-accent {
  background: var(--color-accent-dim);
  border-color: var(--color-border-accent);
  color: var(--color-accent);
}

.btn-accent:hover:not(:disabled) {
  background: var(--color-accent-dim);
  box-shadow: var(--glow-accent);
  filter: brightness(1.15);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent);
  animation: pulse 2.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

.form-card {
  width: 100%;
  max-width: 400px;
  padding: 2.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(16px);
}

.form-card h1 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  margin-bottom: 0.5rem;
}

.form-card .form-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 0.75rem 0.875rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.password-field-wrap input {
  padding-right: 2.75rem;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-border-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.form-group input::placeholder {
  color: var(--color-text-dim);
}

.form-group input.is-invalid {
  border-color: var(--color-error);
}

.form-group input.is-valid {
  border-color: var(--color-border-accent);
}

.form-error,
.form-success {
  font-size: 0.8rem;
  margin-top: 0.5rem;
  min-height: 0;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.form-error.is-visible,
.form-success.is-visible {
  min-height: 1.2em;
  opacity: 1;
  transform: translateY(0);
}

.form-error.is-visible {
  color: var(--color-error);
  text-shadow: var(--color-error-shadow);
}

.form-success.is-visible {
  color: var(--color-accent);
}

.form-footer {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.form-footer a {
  color: var(--color-accent);
  transition: opacity var(--transition-fast);
}

.form-footer a:hover {
  opacity: 0.85;
}

.field-hint {
  font-size: 0.72rem;
  margin-top: 0.35rem;
  min-height: 1em;
  transition: color var(--transition-fast);
}

.field-hint.is-error {
  color: var(--color-error);
  text-shadow: var(--color-error-shadow);
}

.field-hint.is-success {
  color: var(--color-accent);
}

.validation-list {
  margin-top: 0.5rem;
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--color-text-dim);
}

.pw-ok {
  color: var(--color-accent);
  font-weight: 600;
}

.pw-bad {
  color: var(--color-error);
  font-weight: 600;
}

.validation-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  color: var(--color-text-dim);
  transition: color var(--transition-fast);
}

.validation-item.is-valid {
  color: var(--color-accent);
}

.validation-item.is-invalid {
  color: var(--color-error);
}

.validation-icon {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid currentColor;
  display: grid;
  place-items: center;
  font-size: 0.55rem;
  flex-shrink: 0;
}

.validation-item.is-valid .validation-icon {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
}

.page-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4rem) clamp(1.25rem, 4vw, 3rem);
}

.page-header {
  margin-bottom: 3rem;
}

.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.page-header h1 .accent-line {
  display: inline-block;
  width: clamp(1.25rem, 3.5vw, 2rem);
  height: clamp(0.3rem, 0.9vw, 0.45rem);
  background: var(--color-accent);
  margin-left: 0.12em;
  vertical-align: baseline;
  box-shadow: var(--glow-accent);
  animation: cursor-blink 1.2s step-end infinite;
}

@keyframes cursor-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.custom-select-native {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.custom-select {
  position: relative;
  width: 100%;
}

.custom-select-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.55rem 0.65rem;
  font-size: 0.78rem;
  text-align: left;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.custom-select-trigger:hover,
.custom-select.is-open .custom-select-trigger {
  border-color: var(--color-border-accent);
}

.custom-select-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.custom-select-arrow {
  width: 0.45rem;
  height: 0.45rem;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(45deg);
  transition: transform 0.22s var(--ease-out, ease-out), border-color var(--transition-fast);
  flex-shrink: 0;
  margin-top: -0.15rem;
}

.custom-select.is-open .custom-select-arrow {
  transform: rotate(-135deg);
  margin-top: 0.15rem;
  border-color: var(--color-accent);
}

.custom-select-menu {
  position: absolute;
  z-index: 50;
  top: calc(100% + 0.35rem);
  left: 0;
  right: 0;
  margin: 0;
  padding: 0.35rem 0;
  list-style: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-elevated);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
  max-height: 14rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px) scale(0.98);
  transform-origin: top center;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.22s var(--ease-out, ease-out), visibility 0.18s;
}

.custom-select.is-open .custom-select-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.custom-select-option {
  padding: 0.5rem 0.75rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.custom-select-option:hover,
.custom-select-option.is-selected {
  background: var(--color-accent-dim);
  color: var(--color-accent);
}

.page-header p {
  margin-top: 0.75rem;
  color: var(--color-text-muted);
  max-width: 520px;
}

.placeholder-card {
  padding: 3rem 2rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--color-text-dim);
}

.user-greeting {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.user-greeting strong {
  color: var(--color-accent);
}

.membership-badge {
  font-size: 0.65rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--color-border-accent);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
  margin-left: 0.35rem;
}

.saint-bgm {
  position: relative;
  z-index: 2;
  pointer-events: auto;
  flex-shrink: 0;
}

.saint-bgm__yt,
.saint-bgm__iframe {
  position: fixed;
  width: 200px;
  height: 200px;
  opacity: 0.01;
  pointer-events: none;
  left: 0;
  bottom: 0;
  z-index: -1;
  border: 0;
}

.saint-bgm__icon--muted,
.saint-bgm__icon--play,
.saint-bgm__icon--pause {
  line-height: 1;
}

.saint-bgm__icon--muted {
  font-size: 0.82rem;
}

.saint-bgm__icon--muted,
.saint-bgm__icon--play,
.saint-bgm__icon--pause {
  display: none;
}

.saint-bgm.is-off .saint-bgm__icon--muted {
  display: inline;
}

.saint-bgm.is-waiting-audio .saint-bgm__icon--play {
  display: inline;
}

.saint-bgm.is-playing .saint-bgm__icon--pause {
  display: inline;
}

.saint-bgm.is-waiting-audio .saint-bgm__btn {
  border-color: rgba(255, 200, 120, 0.55);
}

.saint-bgm.is-muted .saint-bgm__btn {
  animation: saint-bgm-pulse 1.6s ease-in-out infinite;
  border-color: rgba(255, 200, 120, 0.55);
}

@keyframes saint-bgm-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 200, 120, 0.25); }
  50% { box-shadow: 0 0 0 6px rgba(255, 200, 120, 0.08); }
}

.saint-bgm__btn {
  pointer-events: auto;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 999px;
  border: 1px solid var(--color-border-accent);
  background: rgba(8, 8, 12, 0.72);
  color: var(--color-accent);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  line-height: 1;
  padding: 0;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  backdrop-filter: blur(6px);
}

.saint-bgm__btn:hover {
  transform: translateY(-1px);
  border-color: var(--color-accent);
  box-shadow: var(--glow-accent);
}