/* === Shibuya Design Tokens === */
:root {
  /* Neon palette */
  --neon-pink: #ff2d78;
  --neon-blue: #00d4ff;
  --neon-yellow: #ffe600;
  --neon-green: #39ff14;
  --neon-red: #ff3131;
  --white: #ffffff;

  /* Backgrounds */
  --bg-dark: #0a0a0f;
  --bg-card: #12121a;
  --bg-elevated: #1a1a26;

  /* Text */
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;

  /* Borders */
  --border-neon: var(--neon-pink);
  --border-width: 2px;

  /* Typography */
  --font-display: "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", ui-monospace, monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Glow effects */
  --glow-pink: 0 0 10px rgba(255, 45, 120, 0.5), 0 0 30px rgba(255, 45, 120, 0.2);
  --glow-blue: 0 0 10px rgba(0, 212, 255, 0.5), 0 0 30px rgba(0, 212, 255, 0.2);
  --glow-yellow: 0 0 10px rgba(255, 230, 0, 0.5), 0 0 30px rgba(255, 230, 0, 0.2);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100dvh;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

#root {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* === Utility Classes === */
.neon-border {
  border: var(--border-width) solid var(--border-neon);
}

.neon-glow-pink {
  text-shadow: var(--glow-pink);
}

.neon-glow-blue {
  text-shadow: var(--glow-blue);
}

.neon-glow-yellow {
  text-shadow: var(--glow-yellow);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid currentColor;
  white-space: nowrap;
}

.badge--pink {
  color: var(--neon-pink);
  background: rgba(255, 45, 120, 0.1);
}

.badge--blue {
  color: var(--neon-blue);
  background: rgba(0, 212, 255, 0.1);
}

.badge--yellow {
  color: var(--neon-yellow);
  background: rgba(255, 230, 0, 0.1);
}

.badge--green {
  color: var(--neon-green);
  background: rgba(57, 255, 20, 0.1);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: var(--border-width) solid;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn--primary {
  background: var(--neon-pink);
  color: var(--bg-dark);
  border-color: var(--neon-pink);
}

.btn--primary:hover {
  box-shadow: var(--glow-pink);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--neon-blue);
  border-color: var(--neon-blue);
}

.btn--outline:hover {
  background: rgba(0, 212, 255, 0.1);
  box-shadow: var(--glow-blue);
}

.btn--large {
  padding: var(--space-md) var(--space-xl);
  font-size: 1.2rem;
}

.btn--small {
  padding: 4px 12px;
  font-size: 0.75rem;
}

.btn--danger {
  background: transparent;
  color: #ff4444;
  border-color: #ff4444;
}

.btn--danger:hover {
  background: rgba(255, 68, 68, 0.1);
  box-shadow: 0 0 12px rgba(255, 68, 68, 0.3);
}

/* === Cards === */
.card {
  background: var(--bg-card);
  border: var(--border-width) solid var(--bg-elevated);
  padding: var(--space-md);
}

.card:hover {
  border-color: var(--neon-pink);
}

/* === Marquee Banner === */
.marquee {
  overflow: hidden;
  white-space: nowrap;
  background: var(--neon-yellow);
  color: var(--bg-dark);
  font-weight: 900;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-xs) 0;
}

.marquee__inner {
  display: inline-block;
  animation: marquee-scroll 14s linear infinite;
}

@keyframes marquee-scroll {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* === App Shell Ticker === */
.marquee--shell {
  background: var(--neon-pink);
  position: sticky;
  top: 0;
  z-index: 50;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* === Shared Page Layout === */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-bottom: var(--border-width) solid var(--bg-elevated);
  background: var(--bg-card);
}

.back-btn {
  background: none;
  border: none;
  color: var(--neon-blue);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  padding: var(--space-xs) 0;
}

.page-title-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-bottom: var(--border-width) solid var(--bg-elevated);
}

.page-title-bar--stacked {
  flex-direction: column;
  align-items: flex-start;
}

.page-title {
  font-size: 1.3rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

.fab-area {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-md);
  background: linear-gradient(transparent, var(--bg-dark) 40%);
  padding-top: var(--space-xl);
}

.fab-area__buttons {
  display: flex;
  gap: var(--space-sm);
}

/* === Auth Page === */
.auth-page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  gap: var(--space-lg);
}

.auth-page__title {
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 900;
  color: var(--neon-pink);
  letter-spacing: -0.02em;
  text-shadow: var(--glow-pink);
}

.auth-page__toggle {
  display: flex;
  gap: var(--space-xs);
}

.auth-page__form {
  padding: var(--space-lg);
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.auth-page__form--register {
  border-color: var(--neon-green);
}

.auth-page__form--login {
  border-color: var(--neon-blue);
}

.auth-page__label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.auth-page__input-wrap {
  position: relative;
}

.auth-page__at-sign {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--neon-pink);
  font-weight: 800;
  font-size: 1.1rem;
}

.auth-page__input {
  width: 100%;
  padding: var(--space-sm) var(--space-sm) var(--space-sm) 36px;
  background: var(--bg-elevated);
  border: var(--border-width) solid var(--bg-elevated);
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
  font-family: var(--font-body);
  outline: none;
}

.auth-page__input:focus {
  border-color: var(--neon-pink);
  box-shadow: 0 0 8px rgba(255, 45, 120, 0.3);
}

.auth-page__input::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
}

/* === Loading State === */
.loading-state {
  min-height: 60dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-lg);
}

.loading-state__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-elevated);
  border-top-color: var(--neon-pink);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-state__text {
  font-size: 1rem;
  font-weight: 700;
  color: var(--neon-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* === Error State === */
.error-state {
  min-height: 60dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  text-align: center;
}

.error-state__icon {
  font-size: 2rem;
  color: var(--neon-red);
}

.error-state__message {
  color: var(--neon-red);
  font-weight: 700;
  font-size: 1rem;
}

/* === Error Page (404) === */
.error-page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  text-align: center;
}

.error-page__code {
  font-size: clamp(4rem, 16vw, 8rem);
  font-weight: 900;
  color: var(--neon-pink);
  line-height: 1;
  text-shadow:
    0 0 20px rgba(255, 45, 120, 0.8),
    0 0 60px rgba(255, 45, 120, 0.4);
}

.error-page__star {
  font-size: 2rem;
  color: var(--neon-yellow);
  animation: title-pulse 3s ease-in-out infinite;
}

.error-page__message {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* === Inline Error Text === */
.error-text {
  color: var(--neon-red);
  font-size: 0.85rem;
  font-weight: 600;
}

/* === Join Group Page === */
.join-page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  gap: var(--space-md);
  text-align: center;
}

.join-page__status {
  color: var(--neon-blue);
  font-weight: 700;
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* === Landing Page === */
.landing {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.landing__hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  gap: var(--space-lg);
}

.landing__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.landing__title {
  font-size: clamp(3.5rem, 14vw, 8rem);
  font-weight: 900;
  color: var(--neon-pink);
  letter-spacing: -0.02em;
  line-height: 1;
  text-shadow:
    0 0 20px rgba(255, 45, 120, 0.8),
    0 0 60px rgba(255, 45, 120, 0.4),
    0 0 100px rgba(255, 45, 120, 0.2);
  animation: title-pulse 3s ease-in-out infinite;
}

@keyframes title-pulse {
  0%, 100% {
    text-shadow:
      0 0 20px rgba(255, 45, 120, 0.8),
      0 0 60px rgba(255, 45, 120, 0.4),
      0 0 100px rgba(255, 45, 120, 0.2);
  }
  50% {
    text-shadow:
      0 0 30px rgba(255, 45, 120, 1),
      0 0 80px rgba(255, 45, 120, 0.6),
      0 0 120px rgba(255, 45, 120, 0.3);
  }
}

.landing__tagline {
  font-size: clamp(1.3rem, 5vw, 2.4rem);
  font-weight: 800;
  color: var(--neon-yellow);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-shadow: var(--glow-yellow);
}

.landing__description {
  padding: var(--space-md) var(--space-lg);
  max-width: 420px;
  border-color: var(--neon-blue);
  text-align: left;
}

.landing__description-header {
  font-weight: 800;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--neon-blue);
  margin-bottom: var(--space-sm);
}

.landing__description p:last-child {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.landing__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  max-width: 380px;
  width: 100%;
}

.landing__feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-color: var(--bg-elevated);
  background: var(--bg-card);
}

.landing__feature-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

.landing__feature-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.landing__cta {
  margin-top: var(--space-sm);
  font-size: 1.3rem;
  padding: var(--space-md) var(--space-2xl);
}

.landing__sub-cta {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
  text-transform: uppercase;
  animation: bounce-up 1.5s ease-in-out infinite;
}

@keyframes bounce-up {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.marquee--pink {
  background: var(--neon-pink);
}

.marquee--blue {
  background: var(--neon-blue);
}

/* === Decorative Section Title === */
.section-title-decorated::before {
  content: "\2605 ";
  color: var(--neon-yellow);
}

.section-title-decorated::after {
  content: " \2605";
  color: var(--neon-yellow);
}

/* === Groups Page === */
.groups-page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.groups-header__left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.groups-header__logo {
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--neon-pink);
}

.groups-content {
  flex: 1;
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-bottom: 80px;
}

.groups-empty {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
  color: var(--text-secondary);
}

.groups-empty__icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.groups-empty__title {
  font-weight: 700;
  color: var(--neon-yellow);
}

.groups-empty__desc {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: var(--space-xs);
}

/* Group Card */
.group-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-card);
  border: var(--border-width) solid var(--bg-elevated);
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  transition: border-color 0.15s ease;
}

.group-card:hover {
  border-color: var(--neon-pink);
}

.group-card__name {
  font-size: 1rem;
  font-weight: 700;
}

.group-card__badges {
  display: flex;
  gap: var(--space-xs);
  flex-shrink: 0;
}

/* Import feedback */
.import-feedback {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-md);
  font-size: 0.85rem;
  border: 1px solid;
}

.import-feedback--error {
  color: var(--neon-red);
  border-color: var(--neon-red);
  background: rgba(255, 49, 49, 0.1);
}

.import-feedback--success {
  color: var(--neon-green);
  border-color: var(--neon-green);
  background: rgba(57, 255, 20, 0.1);
}

.import-feedback__dismiss {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  padding: var(--space-xs);
  font-size: 0.9rem;
}

/* Import dropdown */
.import-dropdown-container {
  position: relative;
}

.import-dropdown-trigger {
  white-space: nowrap;
}

.import-dropdown-arrow {
  font-size: 0.6em;
  margin-left: 2px;
}

.import-dropdown-backdrop {
  position: fixed;
  inset: 0;
  z-index: 49;
}

.import-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-xs);
  background: var(--bg-card);
  border: var(--border-width) solid var(--neon-blue);
  min-width: 180px;
  z-index: 50;
  display: flex;
  flex-direction: column;
}

.import-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: none;
  border: none;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: left;
  cursor: pointer;
  color: var(--text-primary);
  transition: background 0.15s ease;
}

.import-dropdown-item:hover {
  background: var(--bg-elevated);
}

.import-dropdown-item__icon {
  font-size: 0.85rem;
  font-weight: 900;
  color: var(--neon-pink);
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  z-index: 100;
}

.modal {
  background: var(--bg-card);
  border: var(--border-width) solid var(--neon-pink);
  padding: var(--space-lg);
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.modal__title {
  font-size: 1.1rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--neon-blue);
}

.modal__input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-elevated);
  border: var(--border-width) solid var(--bg-elevated);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-body);
  outline: none;
}

.modal__input:focus {
  border-color: var(--neon-blue);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.3);
}

.modal__input::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
}

.modal__actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
}

/* === More Menu (three-dot dropdown) === */
.more-menu-container {
  position: relative;
}

.more-menu-btn {
  min-width: 32px;
  letter-spacing: 0.15em;
}

.more-menu-backdrop {
  position: fixed;
  inset: 0;
  z-index: 49;
}

.more-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-xs);
  background: var(--bg-card);
  border: var(--border-width) solid var(--bg-elevated);
  min-width: 150px;
  z-index: 50;
  display: flex;
  flex-direction: column;
}

.more-menu__item {
  background: none;
  border: none;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: left;
  cursor: pointer;
  color: var(--text-primary);
  transition: background 0.15s ease;
}

.more-menu__item:hover {
  background: var(--bg-elevated);
}

.more-menu__item--danger {
  color: #ff4444;
}

.more-menu__item--danger:hover {
  background: rgba(255, 68, 68, 0.1);
}

/* Invite code box */
.invite-code-box {
  background: var(--bg-elevated);
  border: var(--border-width) solid var(--neon-yellow);
  padding: var(--space-md);
  text-align: center;
}

.invite-code {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: 0.15em;
  color: var(--neon-yellow);
  text-shadow: var(--glow-yellow);
}

/* === Group Detail Page === */
.group-detail {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding-bottom: 80px;
}

.group-detail__section {
  padding: var(--space-md);
}

.group-detail__section-title {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--neon-pink);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
}

.group-detail__members {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

/* Member badge */
.member-badge {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 700;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--neon-blue);
  color: var(--neon-blue);
}

/* === Settlement Currency Selector === */
.settlement-currency-selector {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.settlement-currency-select {
  flex: 1;
  max-width: 200px;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--bg-elevated);
  border-radius: var(--radius);
  font-size: 0.85rem;
}

.settlement-currency-select:focus {
  outline: none;
  border-color: var(--neon-pink);
}

/* === Settlements === */
.settlements-empty {
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: var(--space-sm) 0;
}

.settlements-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.settlement-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--bg-elevated);
}

.settlement-row__people {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
  min-width: 0;
}

.settlement-row__arrow {
  color: var(--neon-pink);
  font-weight: 800;
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* === Balances Grid === */
.balances-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-sm);
}

.balance-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-elevated);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

.balance-card__avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 800;
  color: var(--bg-dark);
  text-transform: uppercase;
  flex-shrink: 0;
}

.balance-card__handle {
  font-size: 1rem;
  font-weight: 700;
  color: var(--neon-blue);
}

.balance-card__amounts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

/* === Settlement Groups === */
.settlement-group {
  border: 1px solid var(--bg-elevated);
  background: var(--bg-card);
}

.settlement-group__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--bg-elevated);
}

.settlement-group__label {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--neon-pink);
}

.settlement-group__rows {
  display: flex;
  flex-direction: column;
}

.settlement-group__rows .settlement-row {
  border: none;
  border-bottom: 1px solid var(--bg-elevated);
  padding-left: var(--space-xl);
}

.settlement-group__rows .settlement-row:last-child {
  border-bottom: none;
}

/* === Collapsible === */
.group-detail__section-title--collapsible {
  cursor: pointer;
  user-select: none;
  transition: color 0.15s ease;
}

.group-detail__section-title--collapsible:hover {
  color: var(--neon-blue);
}

.collapsible-chevron {
  font-size: 0.7rem;
  margin-right: var(--space-xs);
  color: var(--text-secondary);
}

.collapsible-chevron--small {
  font-size: 0.6rem;
}

.settlement-group__header--collapsible {
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease;
}

.settlement-group__header--collapsible:hover {
  background: var(--bg-elevated);
}

.settlement-group__header-left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* === Members Badge Button === */
.members-badge-btn {
  cursor: pointer;
  font-family: var(--font-display);
  transition: background 0.15s ease;
}

.members-badge-btn:hover {
  background: rgba(0, 212, 255, 0.2);
  box-shadow: var(--glow-blue);
}

/* === Members Modal === */
.members-modal__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.members-modal__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background: var(--bg-elevated);
}

.members-modal__handle {
  font-size: 1rem;
  font-weight: 700;
  color: var(--neon-blue);
}

/* === Bills Date Groups === */
.bills-date-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.bills-date-group__header {
  padding: var(--space-xs) 0;
  margin-top: var(--space-sm);
}

.bills-date-group:first-child .bills-date-group__header {
  margin-top: 0;
}

.bills-date-group__date {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.bill-card__paid-by {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--neon-blue);
}

/* === Bill Card (in group page) === */
.bill-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-card);
  border: var(--border-width) solid var(--bg-elevated);
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  transition: border-color 0.15s ease;
}

.bill-card:hover {
  border-color: var(--neon-pink);
}

.bill-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.bill-card__title {
  font-size: 1rem;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bill-card__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.bill-card__totals {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* === Add Bill Page === */
.add-bill {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.add-bill__content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
  gap: var(--space-lg);
}

.add-bill__subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.add-bill__error-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.add-bill__error {
  color: var(--neon-red);
  font-weight: 700;
  font-size: 0.9rem;
  text-align: center;
}

.add-bill__copy-error {
  background: none;
  border: 1px solid var(--neon-red);
  color: var(--neon-red);
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  cursor: pointer;
  flex-shrink: 0;
}

.add-bill__copy-error:hover {
  background: rgba(255, 49, 49, 0.1);
}

.add-bill__choices {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  width: 100%;
  max-width: 400px;
}

.add-bill__choice {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xl) var(--space-md);
  background: var(--bg-card);
  border: var(--border-width) solid;
  cursor: pointer;
  font-family: var(--font-body);
  color: var(--text-primary);
  transition: all 0.15s ease;
}

.add-bill__choice--upload {
  border-color: var(--neon-blue);
}

.add-bill__choice--upload:hover {
  box-shadow: var(--glow-blue);
  background: rgba(0, 212, 255, 0.05);
}

.add-bill__choice--manual {
  border-color: var(--neon-green);
}

.add-bill__choice--manual:hover {
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.5), 0 0 30px rgba(57, 255, 20, 0.2);
  background: rgba(57, 255, 20, 0.05);
}

.add-bill__choice-icon {
  font-size: 2.5rem;
}

.add-bill__choice-label {
  font-size: 1.2rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.add-bill__choice-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Add bill loading state */
.add-bill-loading {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-lg);
}

.add-bill-loading__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-elevated);
  border-top-color: var(--neon-pink);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.add-bill-loading__text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--neon-blue);
}

.add-bill-loading__sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* === Bill Editor === */
.bill-editor {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding-bottom: 80px;
}

.bill-editor__title-section {
  padding: var(--space-md);
  border-bottom: var(--border-width) solid var(--bg-elevated);
}

.bill-editor__paidby-section {
  padding: var(--space-md);
  border-bottom: var(--border-width) solid var(--bg-elevated);
}

.bill-editor__label {
  display: block;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--neon-pink);
  margin-bottom: var(--space-xs);
}

.bill-editor__title-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-elevated);
  border: var(--border-width) solid var(--bg-elevated);
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 700;
  font-family: var(--font-body);
  outline: none;
}

.bill-editor__title-input:focus {
  border-color: var(--neon-pink);
  box-shadow: 0 0 8px rgba(255, 45, 120, 0.3);
}

.bill-editor__title-input::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
}

.bill-editor__items-section {
  padding: var(--space-md);
}

.bill-editor__items-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.bill-editor__section-title {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--neon-pink);
}

.bill-editor__add-item {
  width: 100%;
  margin-top: var(--space-sm);
}

.bill-editor__error {
  color: var(--neon-red);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0 var(--space-md);
  text-align: center;
}

/* Bill item card */
.bill-item-card {
  background: var(--bg-card);
  border: var(--border-width) solid var(--bg-elevated);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
}

.bill-item-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.bill-item-card__number {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--neon-blue);
}

.bill-item-card__remove {
  background: none;
  border: 1px solid var(--neon-red);
  color: var(--neon-red);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 2px 8px;
  font-family: var(--font-body);
  font-weight: 700;
}

.bill-item-card__remove:hover {
  background: rgba(255, 49, 49, 0.1);
}

.bill-item-card__fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.bill-item-card__field {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}

.bill-item-card__field--desc {
  width: 100%;
}

.bill-item-card__field-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.bill-item-card__row {
  display: flex;
  gap: var(--space-sm);
}

.bill-item-card__input {
  width: 100%;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--bg-elevated);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-body);
  outline: none;
}

.bill-item-card__input:focus {
  border-color: var(--neon-blue);
}

.bill-item-card__input--small {
  max-width: 100%;
  font-family: var(--font-mono);
}

.bill-item-card__select {
  width: 100%;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
}

.bill-item-card__select:focus {
  border-color: var(--neon-blue);
}

.bill-item-card__assign {
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--bg-elevated);
}

.bill-item-card__assign-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bill-item-card__include-all {
  background: none;
  border: none;
  color: var(--neon-blue);
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  padding: 0;
}

.bill-item-card__include-all:hover {
  text-decoration: underline;
}

.bill-item-card__members {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.bill-item-card__member {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-body);
  background: transparent;
  border: 1px solid var(--text-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.bill-item-card__member--active {
  background: rgba(0, 212, 255, 0.15);
  border-color: var(--neon-blue);
  color: var(--neon-blue);
}

.bill-item-card__member:hover {
  border-color: var(--neon-blue);
}

/* Bill editor summary */
.bill-editor__summary {
  padding: var(--space-md);
  border-top: var(--border-width) solid var(--neon-pink);
  background: var(--bg-card);
}

.bill-editor__summary-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.bill-editor__summary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
}

.bill-editor__summary-amounts {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.bill-editor__summary-total {
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: var(--border-width) solid var(--neon-pink);
}

/* === View Bill === */
.view-bill {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.view-bill__meta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.view-bill__section {
  padding: var(--space-md);
}

.view-bill__section-title {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--neon-pink);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
}

.view-bill__item {
  background: var(--bg-card);
  border: 1px solid var(--bg-elevated);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-xs);
}

.view-bill__item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.view-bill__item-desc {
  font-weight: 600;
  font-size: 0.9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.view-bill__item-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-top: var(--space-xs);
}

.view-bill__item-members {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* Receipt display */
.view-bill__receipt {
  background: var(--bg-card);
  border: var(--border-width) solid var(--neon-yellow);
  padding: var(--space-sm);
  cursor: pointer;
  text-align: center;
}

.view-bill__receipt-img {
  max-width: 100%;
  max-height: 200px;
  object-fit: contain;
}

.view-bill__receipt-tap {
  display: block;
  font-size: 0.7rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.view-bill__receipt-modal {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md);
}

/* === Responsive === */
@media (min-width: 768px) {
  html {
    font-size: 17px;
  }

  .groups-content {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
  }

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

  .group-detail__section {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
  }

  .add-bill__content {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
  }

  .bill-editor__title-section,
  .bill-editor__paidby-section,
  .bill-editor__items-section,
  .bill-editor__summary,
  .bill-editor__error {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
  }

  .view-bill__section {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
  }

  .add-bill__choices {
    flex-direction: row;
    max-width: 100%;
  }

  .add-bill__choice {
    flex: 1;
  }
}

@media (min-width: 1024px) {
  html {
    font-size: 18px;
  }
}