/* ============================================================
   ONE WORD — Design System
   ============================================================ */

:root {
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-text-secondary: #777777;
  --color-border: #e5e7eb;
  --color-btn: #111111;
  --color-btn-text: #ffffff;
  --color-hover: rgba(17, 17, 17, 0.06);
  --color-word-dim: #cccccc;

  --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  --radius: 8px;
  --transition: 0.4s ease;
  --transition-fast: 0.2s ease;

  --topbar-height: 56px;
  --panel-width: 320px;
}

/* ============================================================
   Reset & Base
   ============================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
  height: 100dvh;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input {
  font-family: inherit;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Screens
   ============================================================ */

.screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  background: var(--color-bg);
}

.screen--active {
  opacity: 1;
  visibility: visible;
}

.screen--fading {
  opacity: 0;
  visibility: visible;
}

/* ============================================================
   Landing
   ============================================================ */

#landing {
  align-items: center;
  justify-content: center;
}

.landing__inner {
  width: 100%;
  max-width: 560px;
  padding: 2rem 1.5rem;
  text-align: center;
}

.landing__title {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 0.12em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.landing__subtitle {
  font-size: clamp(1.125rem, 3vw, 1.5rem);
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 3rem;
}

.landing__form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.landing__input {
  width: 100%;
  max-width: 400px;
  padding: 1rem 1.25rem;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: var(--font-weight-light);
  text-align: center;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition-fast);
}

.landing__input::placeholder {
  color: var(--color-text-secondary);
  opacity: 0.6;
}

.landing__input:focus {
  border-color: var(--color-text);
}

.landing__hint {
  font-size: 0.875rem;
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
}

.landing__error {
  font-size: 0.875rem;
  color: var(--color-text);
  min-height: 1.25rem;
}

.landing__footer {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  line-height: 2;
  opacity: 0.7;
}

.turnstile-container {
  display: flex;
  justify-content: center;
  min-height: 65px;
  margin-top: 0.25rem;
}

/* ============================================================
   Button
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2.5rem;
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius);
  transition: opacity var(--transition-fast);
}

.btn--primary {
  background: var(--color-btn);
  color: var(--color-btn-text);
  min-width: 200px;
}

.btn--primary:hover {
  opacity: 0.85;
}

.btn--primary:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

.btn--primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.landing__submit:disabled {
  opacity: 0.35;
}

.landing__submit {
  margin-top: 0.5rem;
  font-size: 1.0625rem;
  padding: 1rem 3rem;
}

/* ============================================================
   Loading
   ============================================================ */

#loading {
  align-items: center;
  justify-content: center;
}

.loading__text {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

/* ============================================================
   Chose Screen
   ============================================================ */

#chose {
  align-items: center;
  justify-content: center;
}

.chose__inner {
  text-align: center;
  padding: 2rem;
}

.chose__label {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.chose__word {
  font-size: clamp(2.5rem, 10vw, 5rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 0.06em;
  color: var(--color-text);
}

/* ============================================================
   Top Bar
   ============================================================ */

.topbar {
  position: relative;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: var(--topbar-height);
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.topbar__brand {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.14em;
  justify-self: start;
}

.topbar__nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  justify-self: end;
}

.topbar__participants {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.topbar__participants #participants-count {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
}

#main {
  position: relative;
}

.btn--share {
  display: inline-flex;
  align-items: center;
  background: var(--color-btn);
  color: var(--color-btn-text);
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius);
  gap: 0.5rem;
  justify-self: center;
  transition: opacity var(--transition-fast);
}

.btn--share:hover {
  opacity: 0.85;
}

.btn--share:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

.topbar__search-wrap {
  position: relative;
}

.topbar__search {
  width: 140px;
  padding: 0.4rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-text);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition-fast), width var(--transition-fast);
}

.topbar__search:focus {
  border-color: var(--color-text);
  width: 180px;
}

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

.topbar__link {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  padding: 0.25rem 0;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.topbar__link:hover {
  color: var(--color-text);
}

.topbar__link:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

/* ============================================================
   Center Button
   ============================================================ */

.center-btn {
  position: absolute;
  bottom: max(2.75rem, calc(env(safe-area-inset-bottom, 0px) + 2rem));
  right: max(1.5rem, env(safe-area-inset-right, 0px));
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0;
  background: none;
}

.center-btn__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1;
  transition: opacity var(--transition-fast);
}

.btn--share__icon {
  font-size: 0.875rem;
}

.topbar__participants-icon {
  font-size: 0.75rem;
  margin-right: 0.25rem;
}

.center-btn:hover .center-btn__icon {
  opacity: 0.7;
}

.center-btn:focus-visible .center-btn__icon {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

.center-btn__label {
  font-size: 0.6875rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}

/* ============================================================
   Toast
   ============================================================ */

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(1rem);
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 50;
  pointer-events: none;
}

.toast--visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   Word Cloud
   ============================================================ */

.cloud-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  cursor: grab;
  touch-action: none;
}

.cloud-container--dragging {
  cursor: grabbing;
}

#word-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ============================================================
   Side Panel
   ============================================================ */

.panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.4);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  z-index: 20;
}

.panel-backdrop--visible {
  opacity: 1;
  visibility: visible;
}

.side-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--panel-width);
  max-width: 90vw;
  height: 100%;
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
  transform: translateX(100%);
  transition: transform var(--transition);
  z-index: 30;
  padding: 2rem 1.75rem;
}

.side-panel--open {
  transform: translateX(0);
}

.side-panel__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  line-height: 1;
  padding: 0.25rem 0.5rem;
  transition: color var(--transition-fast);
}

.side-panel__close:hover {
  color: var(--color-text);
}

.side-panel__close:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

.side-panel__content {
  margin-top: 2rem;
}

.side-panel__word {
  font-size: 2rem;
  font-weight: var(--font-weight-light);
  line-height: 1.2;
  margin-bottom: 2.5rem;
  word-break: break-word;
}

.side-panel__stats {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.side-panel__stat dt {
  font-size: 0.75rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.side-panel__stat dd {
  font-size: 1.5rem;
  font-weight: var(--font-weight-light);
}

/* ============================================================
   About Dialog
   ============================================================ */

.about-dialog {
  position: fixed;
  top: calc(var(--topbar-height) + 1rem);
  right: 1.5rem;
  transform: none;
  width: 320px;
  max-width: calc(100vw - 2rem);
  max-height: calc(100vh - var(--topbar-height) - 2rem);
  padding: 1.75rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  z-index: 40;
  overflow-y: auto;
  box-shadow: none;
}

.about-dialog--open {
  opacity: 1;
  visibility: visible;
}

.about-dialog::backdrop,
.about-backdrop {
  display: none;
}

.about-dialog__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  line-height: 1;
  padding: 0.25rem 0.5rem;
  transition: color var(--transition-fast);
}

.about-dialog__close:hover {
  color: var(--color-text);
}

.about-dialog__close:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

.about-dialog__title {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.about-dialog__body p {
  font-size: 0.9375rem;
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.about-dialog__body p:last-child {
  margin-bottom: 0;
}

/* Removed backdrop blur per spec */

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

@media (max-width: 768px) {
  .topbar {
    padding: 0 1rem;
    grid-template-columns: auto 1fr auto;
    gap: 0.5rem;
  }

  .btn--share {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
  }

  .btn--share .btn--share__text {
    display: none;
  }

  .topbar__nav {
    gap: 0.75rem;
  }

  .topbar__search {
    width: 100px;
  }

  .topbar__search:focus {
    width: 120px;
  }

  .topbar__link {
    font-size: 0.75rem;
  }

  .side-panel {
    width: 100%;
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .topbar__brand {
    font-size: 0.6875rem;
  }

  .topbar__participants {
    font-size: 0.6875rem;
  }

  .about-dialog {
    right: 1rem;
    width: calc(100vw - 2rem);
  }

  .center-btn {
    bottom: max(3rem, calc(env(safe-area-inset-bottom, 0px) + 2.25rem));
    right: max(1rem, env(safe-area-inset-right, 0px));
  }

  .topbar__search {
    width: 80px;
    padding: 0.35rem 0.5rem;
    font-size: 0.75rem;
  }

  .topbar__search:focus {
    width: 100px;
  }

  .landing__inner {
    padding: 1.5rem 1.25rem;
  }
}