/* FormFlow - Themeable one-at-a-time form engine */

:root {
  --ff-bg: #0A0C10;
  --ff-surface: #111318;
  --ff-border: #1C1E26;
  --ff-text: #9BA0AE;
  --ff-text-muted: #555A66;
  --ff-text-bright: #E2E4EA;
  --ff-accent: #FFFFFF;
  --ff-accent-glow: rgba(255, 255, 255, 0.06);
  --ff-ambient-tint: rgba(0, 255, 239, 0.04);
  --ff-secondary: #5CEACA;
  --ff-error: #ef4444;
  --ff-font-display: 'Inter', system-ui, sans-serif;
  --ff-font-body: 'Inter', system-ui, sans-serif;
  --ff-radius: 0.5rem;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--ff-font-body);
  background: var(--ff-bg);
  color: var(--ff-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--ff-accent);
  color: var(--ff-bg);
}

/* ── Ambient background ── */

.ff-ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}
.ff-ambient-layer {
  position: absolute;
  inset: -20%;
  width: 140%;
  height: 140%;
}
.ff-ambient-1 {
  background: radial-gradient(ellipse 80% 60% at 20% 50%, var(--ff-ambient-tint) 0%, transparent 70%),
              radial-gradient(ellipse 60% 80% at 80% 30%, var(--ff-ambient-tint) 0%, transparent 60%);
  animation: ff-drift-1 20s ease-in-out infinite;
}
.ff-ambient-2 {
  background: radial-gradient(ellipse 70% 50% at 70% 60%, var(--ff-ambient-tint) 0%, transparent 65%),
              radial-gradient(ellipse 90% 40% at 30% 70%, var(--ff-ambient-tint) 0%, transparent 55%);
  animation: ff-drift-2 28s ease-in-out infinite;
  opacity: 0.5;
}

@keyframes ff-drift-1 {
  0%, 100% { transform: translateX(-10%) translateY(0); opacity: 0.5; }
  50% { transform: translateX(8%) translateY(-5%); opacity: 0.3; }
}
@keyframes ff-drift-2 {
  0%, 100% { transform: translateX(5%); opacity: 0.3; }
  50% { transform: translateX(-8%); opacity: 0.6; }
}

/* ── Progress bar ── */

.ff-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--ff-border);
  z-index: 100;
}
.ff-progress-fill {
  height: 100%;
  background: var(--ff-accent);
  width: 0%;
  transition: width 0.4s ease;
  box-shadow: 0 0 8px var(--ff-accent-glow);
}

/* ── Counter ── */

.ff-counter {
  position: fixed;
  top: 16px;
  right: 24px;
  font-size: 0.75rem;
  color: var(--ff-text-muted);
  z-index: 100;
  letter-spacing: 0.05em;
  user-select: none;
}

/* ── Screen container ── */

#formflow {
  position: relative;
  z-index: 1;
  height: 100vh;
  height: 100dvh;
}

.ff-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 3rem 1.5rem;
}

.ff-screen-inner {
  width: 100%;
  max-width: 720px;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* ── Welcome screen ── */

.ff-welcome { text-align: center; }

.ff-welcome-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  margin-bottom: 2rem;
}
.ff-welcome-pill {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ff-text-muted);
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--ff-border);
  border-radius: 2rem;
}

.ff-welcome-title {
  font-family: var(--ff-font-display);
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 700;
  color: var(--ff-text-bright);
  line-height: 1.15;
  margin-bottom: 1rem;
}

.ff-welcome-subtitle {
  font-size: 1.05rem;
  color: var(--ff-text-bright);
  margin-bottom: 1.75rem;
  font-weight: 500;
  opacity: 0.85;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.ff-welcome-desc {
  font-size: 0.925rem;
  color: var(--ff-text);
  line-height: 1.75;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}
.ff-welcome-desc + .ff-welcome-desc {
  margin-top: 0.875rem;
}
.ff-welcome-desc:last-of-type {
  margin-bottom: 2.5rem;
}

.ff-welcome-time {
  font-size: 0.8rem;
  color: var(--ff-text-muted);
  margin-bottom: 2rem;
  letter-spacing: 0.04em;
}

.ff-start-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--ff-accent);
  color: var(--ff-bg);
  border: none;
  padding: 0.875rem 2.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--ff-radius);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--ff-font-body);
  letter-spacing: 0.01em;
}
.ff-start-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 24px var(--ff-accent-glow), 0 0 40px var(--ff-accent-glow);
}
.ff-start-btn:active { transform: translateY(0); }

/* ── Question screen ── */

.ff-question { max-width: 600px; }

.ff-question-number {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.ff-q-num {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--ff-accent);
}
.ff-q-arrow {
  color: var(--ff-accent);
  font-size: 0.875rem;
}
.ff-q-required {
  color: var(--ff-error);
  font-size: 0.875rem;
  margin-left: 0.125rem;
}

.ff-question-title {
  font-family: var(--ff-font-display);
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 600;
  color: var(--ff-text-bright);
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.ff-question-desc {
  font-size: 0.875rem;
  color: var(--ff-text-muted);
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.ff-question-input { margin-bottom: 1.25rem; }

/* ── Text input ── */

.ff-text-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--ff-border);
  padding: 0.75rem 0;
  font-size: 1.125rem;
  color: var(--ff-text-bright);
  font-family: var(--ff-font-body);
  outline: none;
  transition: border-color 0.2s ease;
}
.ff-text-input:focus { border-color: var(--ff-accent); }
.ff-text-input::placeholder { color: var(--ff-text-muted); opacity: 0.5; }

/* ── Long text (textarea) ── */

.ff-long-text-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--ff-border);
  padding: 0.75rem 0;
  font-size: 1rem;
  color: var(--ff-text-bright);
  font-family: var(--ff-font-body);
  outline: none;
  resize: none;
  min-height: 72px;
  transition: border-color 0.2s ease;
  line-height: 1.65;
}
.ff-long-text-input:focus { border-color: var(--ff-accent); }
.ff-long-text-input::placeholder { color: var(--ff-text-muted); opacity: 0.5; }

/* ── Choice options ── */

.ff-choices {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ff-choice {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  background: var(--ff-surface);
  border: 1px solid var(--ff-border);
  padding: 0.75rem 1rem;
  border-radius: var(--ff-radius);
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
  font-family: var(--ff-font-body);
  color: var(--ff-text);
  font-size: 0.95rem;
  line-height: 1.4;
}

.ff-choice-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.5rem;
  height: 1.5rem;
  border: 1px solid var(--ff-border);
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--ff-text-muted);
  flex-shrink: 0;
  transition: all 0.15s ease;
  letter-spacing: 0.02em;
}

@media (hover: hover) {
  .ff-choice:hover {
    border-color: var(--ff-accent);
    background: var(--ff-accent-glow);
  }
  .ff-choice:hover .ff-choice-key {
    border-color: var(--ff-accent);
    color: var(--ff-accent);
  }
}

.ff-choice.selected {
  border-color: var(--ff-accent);
  background: var(--ff-accent-glow);
  color: var(--ff-text-bright);
}
.ff-choice.selected .ff-choice-key {
  background: var(--ff-accent);
  border-color: var(--ff-accent);
  color: var(--ff-bg);
}

/* ── Scale ── */

.ff-scale-options {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.ff-scale-option {
  flex: 1;
  padding: 0.875rem 0.5rem;
  background: var(--ff-surface);
  border: 1px solid var(--ff-border);
  border-radius: var(--ff-radius);
  color: var(--ff-text);
  font-size: 1.125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: var(--ff-font-body);
  text-align: center;
}

@media (hover: hover) {
  .ff-scale-option:hover {
    border-color: var(--ff-accent);
    background: var(--ff-accent-glow);
  }
}

.ff-scale-option.selected {
  border-color: var(--ff-accent);
  background: var(--ff-accent);
  color: var(--ff-bg);
  font-weight: 700;
  box-shadow: 0 0 16px var(--ff-accent-glow);
}

.ff-scale-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--ff-text-muted);
  padding: 0 0.25rem;
}

/* ── Rating ── */

.ff-rating-options {
  display: flex;
  gap: 0.5rem;
}

.ff-rating-option {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
  padding: 1rem 0.5rem;
  background: var(--ff-surface);
  border: 1px solid var(--ff-border);
  border-radius: var(--ff-radius);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: var(--ff-font-body);
}

.ff-rating-num {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ff-text);
  transition: color 0.15s ease;
}

.ff-rating-label {
  font-size: 0.65rem;
  color: var(--ff-text-muted);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.15s ease;
}

@media (hover: hover) {
  .ff-rating-option:hover {
    border-color: var(--ff-accent);
    background: var(--ff-accent-glow);
  }
}

.ff-rating-option.selected {
  border-color: var(--ff-accent);
  background: var(--ff-accent);
  box-shadow: 0 0 16px var(--ff-accent-glow);
}
.ff-rating-option.selected .ff-rating-num { color: var(--ff-bg); }
.ff-rating-option.selected .ff-rating-label { color: var(--ff-bg); opacity: 0.8; }

/* ── Footer (OK + hint) ── */

.ff-question-footer {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.ff-ok-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--ff-accent);
  color: var(--ff-bg);
  border: none;
  padding: 0.5rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--ff-radius);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: var(--ff-font-body);
}
.ff-ok-btn:hover { opacity: 0.9; }
.ff-ok-btn:active { transform: scale(0.98); }

.ff-check { font-size: 0.75rem; }

.ff-hint {
  font-size: 0.75rem;
  color: var(--ff-text-muted);
  user-select: none;
}
.ff-hint strong {
  color: var(--ff-text);
  font-weight: 500;
}

/* ── Error ── */

.ff-error-msg {
  color: var(--ff-error);
  font-size: 0.8rem;
  margin-top: 0.5rem;
  min-height: 1.2rem;
}

/* ── Thank you ── */

.ff-thankyou { text-align: center; }

.ff-thankyou-check {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--ff-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  animation: ff-pop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.ff-thankyou-check svg {
  width: 32px;
  height: 32px;
  stroke: var(--ff-bg);
  stroke-width: 3;
  fill: none;
}

.ff-thankyou-title {
  font-family: var(--ff-font-display);
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 700;
  color: var(--ff-text-bright);
  margin-bottom: 1rem;
}

.ff-thankyou-desc {
  font-size: 1rem;
  color: var(--ff-text);
  line-height: 1.7;
  max-width: 480px;
  margin: 0 auto;
}

/* ── Navigation ── */

.ff-nav {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  z-index: 100;
}

.ff-nav button {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ff-surface);
  border: 1px solid var(--ff-border);
  color: var(--ff-text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}
.ff-nav button:first-child { border-radius: var(--ff-radius) var(--ff-radius) 0 0; }
.ff-nav button:last-child { border-radius: 0 0 var(--ff-radius) var(--ff-radius); }
.ff-nav svg { width: 18px; height: 18px; }

@media (hover: hover) {
  .ff-nav button:hover:not(:disabled) {
    color: var(--ff-accent);
    border-color: var(--ff-accent);
    background: var(--ff-accent-glow);
  }
}

.ff-nav button:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

/* ── Animations ── */

@keyframes ff-pop {
  0% { transform: scale(0); opacity: 0; }
  60% { transform: scale(1.15); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes ff-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

.ff-shake { animation: ff-shake 0.35s ease; }

/* ── Loading ── */

.ff-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  height: 100dvh;
  color: var(--ff-text-muted);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
}

/* ── Responsive ── */

@media (max-width: 640px) {
  .ff-screen { padding: 2rem 1.25rem; }
  .ff-scale-options { gap: 0.25rem; }
  .ff-scale-option { padding: 0.75rem 0.25rem; font-size: 1rem; }
  .ff-rating-options { gap: 0.25rem; }
  .ff-rating-option { padding: 0.75rem 0.25rem; }
  .ff-rating-label { font-size: 0.6rem; }
  .ff-choice { padding: 0.625rem 0.75rem; font-size: 0.9rem; }
  .ff-nav { bottom: 16px; right: 16px; }
  .ff-counter { right: 16px; }
}

@media (max-width: 380px) {
  .ff-screen { padding: 1.5rem 1rem; }
}