/* ============================================
   WonderAvenues — Project Intake Questionnaire
   Brand: Black (#0a0a0a) / White (#ffffff)
   Premium monochrome palette
   Fonts: Inter + DM Serif Display
   ============================================ */

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

:root {
  --black: #0a0a0a;
  --white: #ffffff;
  --accent: #0a0a0a;
  --accent-hover: #27272a;
  --accent-subtle: rgba(10, 10, 10, 0.06);
  --accent-glow: rgba(10, 10, 10, 0.08);
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--white);
  color: var(--gray-900);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

h1, h2, h3 {
  font-family: 'DM Serif Display', Georgia, serif;
  font-weight: 400;
  line-height: 1.2;
}

.hidden {
  display: none !important;
}

/* --- Intro Screen --- */
.intro-screen {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: var(--black);
  animation: fadeIn 0.6s ease;
  position: relative;
  overflow: hidden;
}

/* --- 3D Earth Container --- */
.earth-container {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.earth-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.intro-content {
  max-width: 580px;
  text-align: center;
  position: relative;
  z-index: 1;
  background: rgba(10, 10, 10, 0.2);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  padding: 3rem 2.5rem;
}

.intro-logo {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 2.5rem;
  opacity: 0.7;
}

.intro-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  color: var(--white);
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.intro-title span {
  color: var(--white);
  font-style: italic;
}

.intro-subtitle {
  font-size: 1.0625rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.intro-meta {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2.5rem;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.intro-meta span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.intro-meta svg {
  opacity: 0.7;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--white);
  color: var(--black);
  padding: 0.875rem 2rem;
  border: 1.5px solid var(--gray-200);
}

.btn-primary:hover {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

/* On dark background (intro screen) */
.intro-screen .btn-primary {
  background: var(--white);
  color: var(--black);
  border-color: var(--white);
}

.intro-screen .btn-primary:hover {
  background: transparent;
  color: var(--white);
  border-color: var(--gray-500);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1rem;
}

.btn-ghost {
  background: transparent;
  color: var(--gray-500);
  padding: 0.875rem 1.5rem;
}

.btn-ghost:hover {
  color: var(--gray-900);
  background: var(--gray-100);
}

.btn-ghost:disabled {
  opacity: 0;
  pointer-events: none;
}

.btn-submit {
  background: var(--black);
  color: var(--white);
  padding: 0.875rem 2.5rem;
}

.btn-submit:hover {
  background: var(--gray-800);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* --- Form Wrapper --- */
.form-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--white);
  animation: fadeIn 0.4s ease;
}

/* --- Progress Bar --- */
.progress-bar-container {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 1rem 2rem 0.75rem;
}

.progress-bar-track {
  height: 3px;
  background: var(--gray-200);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar-fill {
  height: 100%;
  background: var(--black);
  border-radius: 4px;
  width: 12.5%;
  transition: width var(--transition-slow);
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--gray-500);
  font-weight: 500;
}

/* --- Steps Container --- */
.steps-container {
  flex: 1;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 8rem;
}

.step {
  display: none;
  animation: stepIn 0.35s ease;
}

.step.active {
  display: block;
}

@keyframes stepIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* --- Step Header --- */
.step-header {
  margin-bottom: 2.5rem;
}

.step-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-500);
  background: var(--gray-100);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  margin-bottom: 1rem;
}

.step-header h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  color: var(--black);
  margin-bottom: 0.5rem;
}

.step-header p {
  font-size: 1rem;
  color: var(--gray-500);
}

/* --- Field Groups --- */
.field-group {
  margin-bottom: 2rem;
}

.field-label {
  display: block;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
}

.req {
  color: var(--gray-400);
  font-weight: 400;
}

.opt {
  font-weight: 400;
  color: var(--gray-400);
  font-size: 0.8125rem;
}

/* --- Text Inputs --- */
.text-input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.9375rem;
  color: var(--gray-900);
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  outline: none;
  transition: all var(--transition);
}

.text-input:focus {
  border-color: var(--black);
  background: var(--white);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.text-input::placeholder {
  color: var(--gray-400);
}

.text-input.textarea {
  min-height: 100px;
  resize: vertical;
}

.text-input.error {
  border-color: #b91c1c;
  box-shadow: 0 0 0 3px rgba(185, 28, 28, 0.08);
}

.mb-sm {
  margin-bottom: 0.5rem;
}

/* --- Radio Cards --- */
.radio-group {
  display: grid;
  gap: 0.5rem;
}

.radio-card {
  cursor: pointer;
}

.radio-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio-card-inner {
  display: flex;
  align-items: center;
  padding: 0.875rem 1.125rem;
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--gray-600);
  transition: all var(--transition);
  user-select: none;
}

.radio-card:hover .radio-card-inner {
  border-color: var(--gray-300);
  background: var(--gray-50);
}

.radio-card input:checked + .radio-card-inner {
  border-color: var(--black);
  background: var(--black);
  color: var(--white);
  font-weight: 500;
}

/* Visual cards (project type) */
.cards-visual {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.cards-visual .radio-card-inner {
  flex-direction: column;
  text-align: center;
  padding: 1.5rem 1rem;
  gap: 0.75rem;
}

.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin: 0 auto;
  color: var(--gray-500);
  transition: color var(--transition);
}

.cards-visual .radio-card input:checked + .radio-card-inner .card-icon {
  color: var(--white);
}

.card-label {
  font-size: 0.875rem;
  line-height: 1.3;
}

/* Tier cards */
.cards-tier {
  gap: 0.75rem;
}

.tier-card .radio-card-inner {
  flex-direction: column;
  align-items: flex-start;
  padding: 1.125rem 1.25rem;
  gap: 0.25rem;
}

.tier-name {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--gray-900);
  transition: color var(--transition);
}

.tier-desc {
  font-size: 0.8125rem;
  color: var(--gray-500);
  transition: color var(--transition);
}

.tier-card input:checked + .radio-card-inner .tier-name {
  color: var(--white);
}

.tier-card input:checked + .radio-card-inner .tier-desc {
  color: rgba(255, 255, 255, 0.6);
}

/* Style cards */
.cards-style {
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.75rem;
}

.style-card .radio-card-inner {
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1rem 0.75rem;
  gap: 0.75rem;
}

.style-swatch {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--gray-200);
  transition: all var(--transition);
}

.style-card input:checked + .radio-card-inner {
  border-color: var(--black);
  background: var(--accent-subtle);
  color: var(--black);
}

.style-card input:checked + .radio-card-inner .style-swatch {
  border-color: var(--black);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* --- Checkbox Cards --- */
.checkbox-group {
  display: grid;
  gap: 0.5rem;
}

.check-card {
  cursor: pointer;
}

.check-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.check-card-inner {
  display: flex;
  align-items: center;
  padding: 0.875rem 1.125rem;
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--gray-600);
  transition: all var(--transition);
  user-select: none;
  position: relative;
  padding-left: 2.75rem;
}

.check-card-inner::before {
  content: '';
  position: absolute;
  left: 1rem;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--gray-300);
  border-radius: 4px;
  transition: all var(--transition);
  background: var(--white);
}

.check-card input:checked + .check-card-inner::before {
  background: var(--black);
  border-color: var(--black);
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 12px;
}

.check-card input:checked + .check-card-inner {
  border-color: var(--black);
  background: var(--accent-subtle);
  color: var(--black);
  font-weight: 500;
}

.check-card:hover .check-card-inner {
  border-color: var(--gray-300);
}

/* --- Chips (brand personality) --- */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.check-chip {
  cursor: pointer;
}

.check-chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.check-chip span {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: 50px;
  font-size: 0.875rem;
  color: var(--gray-600);
  transition: all var(--transition);
  user-select: none;
}

.check-chip:hover span {
  border-color: var(--gray-300);
}

.check-chip input:checked + span {
  border-color: var(--black);
  background: var(--black);
  color: var(--white);
  font-weight: 500;
}

.check-chip.disabled span {
  opacity: 0.3;
  cursor: not-allowed;
}

/* --- Conditional Fields --- */
.conditional {
  display: none;
  animation: slideDown 0.3s ease;
}

.conditional.visible {
  display: block;
}

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

/* --- Nav Bar --- */
.nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--gray-200);
  z-index: 100;
}

/* --- Success Screen --- */
#success-screen {
  background: var(--black);
}

.success-icon {
  margin-bottom: 2rem;
}

.success-icon svg {
  animation: scaleIn 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.5); }
  to { opacity: 1; transform: scale(1); }
}

.success-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--gray-800);
}

.success-brand {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--white);
  opacity: 0.5;
  margin-bottom: 0.5rem;
}

.success-tagline {
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* --- Error Message --- */
.field-error {
  font-size: 0.8125rem;
  color: #b91c1c;
  margin-top: 0.375rem;
  display: none;
}

.field-error.show {
  display: block;
  animation: fadeIn 0.2s ease;
}

/* ============================================
   MOBILE-FIRST RESPONSIVE
   80% of users will be on mobile
   ============================================ */

/* --- Tablets & small laptops --- */
@media (max-width: 768px) {
  .intro-screen {
    padding: 1.25rem;
    align-items: flex-end;
    padding-bottom: env(safe-area-inset-bottom, 2rem);
  }

  .intro-content {
    max-width: 100%;
    padding: 2rem 1.5rem;
    border-radius: 20px;
    margin-bottom: 1rem;
  }

  .intro-logo {
    margin-bottom: 1.5rem;
    font-size: 0.75rem;
  }

  .intro-title {
    font-size: clamp(1.625rem, 7vw, 2.5rem);
    margin-bottom: 0.875rem;
    text-shadow: 0 2px 24px rgba(0, 0, 0, 0.7);
  }

  .intro-subtitle {
    font-size: 0.9375rem;
    margin-bottom: 1.75rem;
    line-height: 1.6;
  }

  .intro-meta {
    flex-direction: row;
    gap: 1.5rem;
    margin-bottom: 1.75rem;
    font-size: 0.8125rem;
  }

  .btn-lg {
    padding: 0.875rem 2rem;
    font-size: 0.9375rem;
    width: 100%;
    justify-content: center;
  }

  .steps-container {
    padding: 1.5rem 1.25rem 7.5rem;
  }

  .step-header {
    margin-bottom: 2rem;
  }

  .step-header h2 {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }

  .cards-visual {
    grid-template-columns: 1fr 1fr;
    gap: 0.625rem;
  }

  .cards-visual .radio-card-inner {
    padding: 1.125rem 0.75rem;
    gap: 0.5rem;
  }

  .cards-style {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.625rem;
  }

  .style-card .radio-card-inner {
    padding: 0.875rem 0.5rem;
  }

  .style-swatch {
    width: 40px;
    height: 40px;
  }

  .nav-bar {
    padding: 0.875rem 1.25rem;
    padding-bottom: calc(0.875rem + env(safe-area-inset-bottom, 0px));
  }

  .progress-bar-container {
    padding: 0.875rem 1.25rem 0.625rem;
  }

  .field-group {
    margin-bottom: 1.75rem;
  }

  /* Larger touch targets */
  .radio-card-inner {
    padding: 1rem 1.125rem;
    min-height: 48px;
  }

  .check-card-inner {
    padding: 1rem 1.125rem;
    padding-left: 2.75rem;
    min-height: 48px;
  }

  .text-input {
    padding: 0.9375rem 1rem;
    font-size: 1rem; /* prevent iOS zoom */
  }

  .btn-primary, .btn-submit, .btn-ghost {
    min-height: 48px;
  }

  .btn-submit {
    padding: 0.875rem 2rem;
    font-size: 0.9375rem;
  }

  .tier-card .radio-card-inner {
    padding: 1rem 1.125rem;
  }
}

/* --- Mobile phones --- */
@media (max-width: 480px) {
  .intro-screen {
    padding: 1rem;
    padding-bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
  }

  .intro-content {
    padding: 1.75rem 1.25rem;
    border-radius: 18px;
  }

  .intro-logo {
    margin-bottom: 1.25rem;
    font-size: 0.6875rem;
  }

  .intro-title {
    font-size: clamp(1.5rem, 8vw, 2.25rem);
    margin-bottom: 0.75rem;
  }

  .intro-subtitle {
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
  }

  .intro-meta {
    gap: 1.25rem;
    margin-bottom: 1.5rem;
    font-size: 0.75rem;
  }

  .intro-meta svg {
    width: 16px;
    height: 16px;
  }

  .steps-container {
    padding: 1.25rem 1rem 7rem;
  }

  .step-header {
    margin-bottom: 1.75rem;
  }

  .step-tag {
    font-size: 0.6875rem;
    padding: 0.1875rem 0.625rem;
    margin-bottom: 0.75rem;
  }

  .field-label {
    font-size: 0.875rem;
    margin-bottom: 0.625rem;
  }

  .radio-card-inner,
  .check-card-inner {
    font-size: 0.875rem;
  }

  .card-label {
    font-size: 0.8125rem;
  }

  .card-icon {
    width: 36px;
    height: 36px;
  }

  .card-icon svg {
    width: 20px;
    height: 20px;
  }

  .tier-name {
    font-size: 0.875rem;
  }

  .tier-desc {
    font-size: 0.75rem;
  }

  .chips {
    gap: 0.375rem;
  }

  .check-chip span {
    padding: 0.4375rem 1rem;
    font-size: 0.8125rem;
  }

  .nav-bar {
    padding: 0.75rem 1rem;
    padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
  }

  .btn-ghost {
    padding: 0.75rem 1rem;
    font-size: 0.8125rem;
  }

  .btn-primary {
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
  }

  .progress-labels {
    font-size: 0.75rem;
  }
}

/* --- Very small phones (SE, 5s, etc.) --- */
@media (max-width: 380px) {
  .intro-content {
    padding: 1.5rem 1rem;
    border-radius: 16px;
  }

  .intro-title {
    font-size: 1.375rem;
  }

  .intro-subtitle {
    font-size: 0.8125rem;
    margin-bottom: 1.25rem;
    line-height: 1.55;
  }

  .intro-meta {
    gap: 1rem;
    font-size: 0.6875rem;
  }

  .btn-lg {
    padding: 0.8125rem 1.75rem;
    font-size: 0.875rem;
  }

  .cards-visual {
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }

  .cards-visual .radio-card-inner {
    padding: 0.875rem 0.5rem;
    gap: 0.375rem;
  }

  .cards-style {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }

  .steps-container {
    padding: 1rem 0.875rem 6.5rem;
  }

  .step-header h2 {
    font-size: 1.375rem;
  }
}

/* --- Landscape phones --- */
@media (max-height: 500px) and (orientation: landscape) {
  .intro-screen {
    min-height: 100vh;
    align-items: center;
    padding: 1rem 2rem;
  }

  .intro-content {
    padding: 1.25rem 2rem;
    max-width: 500px;
  }

  .intro-logo {
    margin-bottom: 0.75rem;
  }

  .intro-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
  }

  .intro-subtitle {
    font-size: 0.8125rem;
    margin-bottom: 1rem;
  }

  .intro-meta {
    margin-bottom: 1rem;
  }
}

/* --- Safe area for notched phones --- */
@supports (padding: env(safe-area-inset-bottom)) {
  .nav-bar {
    padding-bottom: calc(0.875rem + env(safe-area-inset-bottom));
  }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

/* --- Focus Visible --- */
.btn:focus-visible,
.radio-card input:focus-visible + .radio-card-inner,
.check-card input:focus-visible + .check-card-inner,
.check-chip input:focus-visible + span {
  outline: 2px solid var(--black);
  outline-offset: 2px;
}

/* --- Shake animation for validation --- */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.shake {
  animation: shake 0.4s ease;
}