/* ═══════════════════════════════════════════════════════════
   DERMAVEIN — Design System v1.0
   styles.css — Arquivo canônico de tokens e componentes

   ABORDAGEM: mobile-first.
   Estilos base são escritos para telas pequenas; media queries
   com min-width expandem o layout para telas maiores.
   Breakpoints de referência: 480px · 600px · 768px · 900px · 1024px
   ═══════════════════════════════════════════════════════════ */

/* ──────────────────────────────────────────
   0. RESET
────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ──────────────────────────────────────────
   1. TOKENS (CSS Custom Properties)
────────────────────────────────────────── */
:root {
  /* Cores da marca */
  --cream:        #F5F0E8;
  --cream-dark:   #EDE7DA;
  --brown-light:  #C9A882;
  --brown-mid:    #A67C52;
  --brown-dark:   #7A5533;
  --brown-text:   #4A3218;
  --brown-card:   #9E6E3F;
  --off-white:    #FDFAF5;
  --warm-gray:    #8C8070;

  /* Paleta estendida */
  --sage:         #B5BFA4;
  --sage-light:   #D4DCCA;
  --sage-dark:    #8A9676;
  --blush:        #DBBFAF;
  --blush-light:  #EDD8CC;
  --clay:         #C4A98A;
  --linen:        #F8F4EE;

  /* Tipografia */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;

  /* Espaçamento (grid de 8px) */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-7:  32px;
  --space-8:  40px;
  --space-9:  48px;
  --space-10: 56px;
  --space-11: 64px;
  --space-12: 80px;
  --space-13: 96px;
  --space-14: 120px;

  /* Raios */
  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-pill: 100px;

  /* Sombras */
  --shadow-sm: 0 1px 3px rgba(74,50,24,0.04);
  --shadow-md: 0 4px 12px rgba(74,50,24,0.07);
  --shadow-lg: 0 8px 32px rgba(74,50,24,0.09);
  --shadow-xl: 0 16px 48px rgba(74,50,24,0.12);

  /* Movimento */
  --ease-smooth:   cubic-bezier(0.16, 1, 0.3, 1);
  --ease-gentle:   cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --duration-fast: 200ms;
  --duration-base: 350ms;
  --duration-slow: 600ms;

  /* Bordas */
  --border-thin:   0.5px solid var(--brown-light);
  --border-subtle: 0.5px solid rgba(201,168,130,0.3);
}

/* ──────────────────────────────────────────
   2. BASE
────────────────────────────────────────── */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--off-white);
  font-family: var(--font-body);
  color: var(--brown-text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }

/* ──────────────────────────────────────────
   3. LAYOUT PRIMITIVOS
────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-9); }
}

@media (min-width: 1024px) {
  .container { padding: 0 60px; }
}

.ds-section {
  padding: var(--space-9) 0; /* mobile: 48px */
}

@media (min-width: 768px) {
  .ds-section { padding: var(--space-12) 0; } /* tablet: 80px */
}

@media (min-width: 1024px) {
  .ds-section { padding: var(--space-14) 0; } /* desktop: 120px */
}

.ds-full-bg  { background: var(--cream); }
.ds-linen-bg { background: var(--linen); }

.ds-dark-bg {
  background: var(--brown-text);
  color: var(--cream);
}

.ds-divider {
  width: 100%;
  height: 0.5px;
  background: linear-gradient(90deg, transparent, var(--brown-light), transparent);
  border: none;
}

/* ──────────────────────────────────────────
   4. CABEÇALHOS DE SEÇÃO
────────────────────────────────────────── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--brown-light);
  margin-bottom: var(--space-4);
}

.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 0.5px;
  background: var(--brown-light);
  flex-shrink: 0;
}

.ds-dark-bg .section-label {
  color: var(--blush);
}

.ds-dark-bg .section-label::before {
  background: var(--blush);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 300;
  color: var(--brown-text);
  line-height: 1.15;
  margin-bottom: var(--space-5);
}

.section-title em {
  font-style: italic;
  color: var(--brown-mid);
}

.ds-dark-bg .section-title {
  color: var(--cream);
}

.ds-dark-bg .section-title em {
  color: var(--brown-light);
}

.section-desc {
  font-size: 14px;
  color: var(--warm-gray);
  line-height: 1.75;
  max-width: 560px;
}

.ds-dark-bg .section-desc {
  color: rgba(245,240,232,0.65);
}

/* ──────────────────────────────────────────
   5. BOTÕES
────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  border: none;
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-smooth);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: var(--brown-text);
  color: var(--cream);
  padding: 14px 32px;
  border-radius: var(--radius-pill);
}

.btn-primary:hover {
  background: var(--brown-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--brown-text);
  padding: 13px 30px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--brown-text);
}

.btn-secondary:hover {
  background: var(--brown-text);
  color: var(--cream);
}

.btn-ghost {
  background: transparent;
  color: var(--brown-mid);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

.btn-ghost:hover {
  color: var(--brown-text);
  background: rgba(166,124,82,0.08);
}

.btn-outline-cream {
  background: transparent;
  color: var(--cream);
  padding: 13px 30px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(245,240,232,0.4);
}

.btn-outline-cream:hover {
  background: rgba(245,240,232,0.1);
  border-color: var(--cream);
}

.btn-sm {
  font-size: 11px;
  padding: 10px 22px;
  letter-spacing: 1px;
}

.btn-lg {
  font-size: 14px;
  padding: 18px 40px;
}

/* ──────────────────────────────────────────
   6. NAV (.ds-nav)
────────────────────────────────────────── */
.ds-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: rgba(253,250,245,0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: var(--border-subtle);
  transition: background var(--duration-base) var(--ease-gentle),
              box-shadow var(--duration-base) var(--ease-gentle),
              transform 400ms var(--ease-smooth);
}

.ds-nav.scrolled {
  background: rgba(253,250,245,0.97);
  box-shadow: var(--shadow-sm);
}

.ds-nav.hidden {
  transform: translateY(-100%);
}

.ds-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  height: 68px;
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 1024px) {
  .ds-nav-inner { padding: 0 60px; }
}

.ds-nav-logo img {
  height: 38px;
  width: auto;
}

.ds-nav-links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .ds-nav-links { display: flex; }
}

.ds-nav-links a {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--warm-gray);
  position: relative;
  padding: 4px 0;
  transition: color var(--duration-fast) var(--ease-gentle);
}

.ds-nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--brown-mid);
  transition: width var(--duration-base) var(--ease-smooth);
}

.ds-nav-links a:hover {
  color: var(--brown-text);
}

.ds-nav-links a:hover::after {
  width: 100%;
}

.ds-nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.ds-nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
}

@media (min-width: 768px) {
  .ds-nav-toggle { display: none; }
}

.ds-nav-toggle span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--brown-text);
  border-radius: 2px;
  transition: all var(--duration-base) var(--ease-smooth);
  transform-origin: left center;
}

.ds-nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translateY(-1px); }
.ds-nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.ds-nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translateY(1px); }

/* Mobile menu */
.ds-nav-mobile {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: var(--off-white);
  border-bottom: var(--border-subtle);
  padding: var(--space-6);
  flex-direction: column;
  gap: var(--space-5);
  z-index: 199;
  box-shadow: var(--shadow-md);
}

.ds-nav-mobile.open {
  display: flex;
}

.ds-nav-mobile a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--brown-text);
  padding: var(--space-3) 0;
  border-bottom: var(--border-subtle);
}

.ds-nav-mobile a:last-of-type {
  border-bottom: none;
}

/* ──────────────────────────────────────────
   7. ANIMAÇÕES DE SCROLL
────────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-slow) var(--ease-smooth),
              transform var(--duration-slow) var(--ease-smooth);
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up.delay-1 { transition-delay: 80ms; }
.fade-up.delay-2 { transition-delay: 160ms; }
.fade-up.delay-3 { transition-delay: 240ms; }
.fade-up.delay-4 { transition-delay: 320ms; }

@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }
}