/* ============================================
   GLOBAL STYLES — Quiz Diagnóstico Melasma
   Beleza Market
   ============================================ */

:root {
  /* Brand Colors */
  --color-primary: #1a1a2e;
  --color-primary-light: #16213e;
  --color-accent: #c9a96e;
  --color-accent-hover: #b8944e;
  --color-accent-light: #f5efe4;

  /* Neutrals */
  --color-white: #ffffff;
  --color-bg: #faf9f7;
  --color-bg-card: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #5a5a6e;
  --color-text-light: #8a8a9e;
  --color-border: #e8e6e1;
  --color-border-hover: #d0cec9;

  /* Status Colors */
  --color-success: #2E7D32;
  --color-warning: #E65100;
  --color-danger: #B71C1C;
  --color-info: #1565C0;
  --color-error: #d32f2f;

  /* WhatsApp */
  --color-whatsapp: #25D366;
  --color-whatsapp-hover: #1da851;

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.10);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* ============================================
   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;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ============================================
   HEADER
   ============================================ */

.header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header__logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.header__logo-img {
  max-height: 48px;
  width: auto;
  display: block;
}

.header__brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.header__tagline {
  font-size: 0.7rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* ============================================
   SCREENS
   ============================================ */

.screen {
  display: none;
  padding: var(--space-2xl) 0;
  min-height: calc(100vh - 70px);
  animation: fadeIn var(--transition-slow) ease;
}

.screen--active {
  display: block;
}

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

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-base);
  border: 2px solid transparent;
  text-align: center;
  line-height: 1.4;
}

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

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

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

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

.btn--ghost:hover {
  color: var(--color-text);
  background: var(--color-bg);
}

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

.btn--outline:hover {
  background: var(--color-accent-light);
}

.btn--whatsapp {
  background: var(--color-whatsapp);
  color: var(--color-white);
  border-color: var(--color-whatsapp);
}

.btn--whatsapp:hover {
  background: var(--color-whatsapp-hover);
  border-color: var(--color-whatsapp-hover);
}

.btn--lg {
  padding: 16px 32px;
  font-size: 1.05rem;
}

.btn--full {
  width: 100%;
}

.btn__arrow {
  transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.form-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-white);
  transition: border-color var(--transition-base);
}

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

.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(201, 169, 110, 0.15);
}

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

.form-error {
  display: none;
  font-size: 0.8rem;
  color: var(--color-error);
  margin-top: var(--space-xs);
}

.form-group.has-error .form-error {
  display: block;
}

.form-group--checkbox {
  margin-bottom: var(--space-lg);
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  cursor: pointer;
}

.form-checkbox input {
  display: none;
}

.form-checkbox__mark {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-top: 2px;
  transition: all var(--transition-fast);
  position: relative;
}

.form-checkbox input:checked + .form-checkbox__mark {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.form-checkbox input:checked + .form-checkbox__mark::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 6px;
  width: 5px;
  height: 9px;
  border: solid var(--color-white);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.form-checkbox__text {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================
   UTILITY
   ============================================ */

.text-center { text-align: center; }
.text-secondary { color: var(--color-text-secondary); }
.text-sm { font-size: 0.875rem; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-md { margin-bottom: var(--space-md); }

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 480px) {
  :root {
    --space-2xl: 32px;
    --space-3xl: 48px;
  }

  .btn--lg {
    padding: 14px 24px;
    font-size: 1rem;
  }

  .container {
    padding: 0 var(--space-md);
  }
}