/* ==========================================================================
   SKINSPERT DESIGN SYSTEM
   Brand tokens, typography, layout primitives, animations
   Based on Skinspert Brand Guidelines V1.0
   ========================================================================== */

/* ---------- 1. CSS Custom Properties (Design Tokens) ---------- */
:root {
  /* --- Primary Palette --- */
  --sk-navy:         #232F23;         /* Deep charcoal green from Kinoko Labs */
  --sk-teal:         #3FA7A3;         /* Vibrant Brand Teal */
  --sk-white:        #FFFFFF;

  /* --- Secondary Palette --- */
  --sk-light-teal:   #EAF4F3;         /* Soft brand teal */
  --sk-soft-blue:    #F4F1EA;         /* Cream/beige background from Kinoko Labs */
  --sk-light-grey:   #F4F1EA;         /* Cream/beige background from Kinoko Labs */
  --sk-charcoal:     #232F23;         /* Charcoal text */

  /* --- Accent (Sunscreen line) --- */
  --sk-yellow:       #F4C95D;
  --sk-light-yellow: #FFF3CC;

  /* --- Semantic Colors --- */
  --sk-success:      #2ECC71;
  --sk-warning:      #F39C12;
  --sk-error:        #E74C3C;
  --sk-info:         #3498DB;

  /* --- Gradients --- */
  --sk-grad-primary:  linear-gradient(135deg, #232F23 0%, #3FA7A3 100%);
  --sk-grad-hero:     linear-gradient(120deg, #F4F1EA 0%, #EAF4F3 100%);
  --sk-grad-card:     linear-gradient(180deg, #F4F1EA 0%, #FFFFFF 100%);
  --sk-grad-cta:      linear-gradient(135deg, #232F23 0%, #354735 100%); /* Dark buttons */
  --sk-grad-footer:   linear-gradient(180deg, #232F23 0%, #161D16 100%); /* Dark footer */

  /* --- Typography --- */
  --sk-font:          'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --sk-font-serif:    'Fraunces', Georgia, 'Times New Roman', serif; /* Kinoko Editorial Serif */
  --sk-fw-regular:    400;
  --sk-fw-medium:     500;
  --sk-fw-semibold:   600;
  --sk-fw-bold:       700;

  /* --- Type Scale (fluid) --- */
  --sk-text-xs:      clamp(0.6875rem, 0.65rem + 0.15vw, 0.75rem);     /* ~11-12px */
  --sk-text-sm:      clamp(0.8125rem, 0.77rem + 0.17vw, 0.875rem);    /* ~13-14px */
  --sk-text-base:    clamp(0.9375rem, 0.88rem + 0.25vw, 1rem);        /* ~15-16px */
  --sk-text-lg:      clamp(1.0625rem, 1rem + 0.3vw, 1.125rem);       /* ~17-18px */
  --sk-text-xl:      clamp(1.1875rem, 1.1rem + 0.35vw, 1.25rem);     /* ~19-20px */
  --sk-text-2xl:     clamp(1.375rem, 1.25rem + 0.5vw, 1.5rem);       /* ~22-24px */
  --sk-text-3xl:     clamp(1.625rem, 1.4rem + 0.9vw, 1.875rem);      /* ~26-30px */
  --sk-text-4xl:     clamp(2rem, 1.6rem + 1.6vw, 2.5rem);            /* ~32-40px */
  --sk-text-5xl:     clamp(2.5rem, 2rem + 2vw, 3.25rem);             /* ~40-52px */

  --sk-leading-tight:   1.2;
  --sk-leading-snug:    1.35;
  --sk-leading-normal:  1.6;
  --sk-leading-relaxed: 1.75;

  /* --- Spacing Scale --- */
  --sk-sp-1:   0.25rem;   /* 4px  */
  --sk-sp-2:   0.5rem;    /* 8px  */
  --sk-sp-3:   0.75rem;   /* 12px */
  --sk-sp-4:   1rem;      /* 16px */
  --sk-sp-5:   1.25rem;   /* 20px */
  --sk-sp-6:   1.5rem;    /* 24px */
  --sk-sp-8:   2rem;      /* 32px */
  --sk-sp-10:  2.5rem;    /* 40px */
  --sk-sp-12:  3rem;      /* 48px */
  --sk-sp-16:  4rem;      /* 64px */
  --sk-sp-20:  5rem;      /* 80px */
  --sk-sp-24:  6rem;      /* 96px */
  --sk-sp-32:  8rem;      /* 128px */

  /* --- Layout --- */
  --sk-container:    1280px;
  --sk-container-sm: 720px;
  --sk-container-lg: 1440px;
  --sk-gutter:       clamp(1rem, 0.5rem + 2vw, 2rem);

  /* --- Borders --- */
  --sk-radius-xs:   2px;
  --sk-radius-sm:   4px;
  --sk-radius-md:   8px;
  --sk-radius-lg:   12px;
  --sk-radius-xl:   16px;
  --sk-radius-2xl:  24px;
  --sk-radius-full: 9999px;

  --sk-border:      1px solid rgba(31,42,68,0.08);
  --sk-border-dark: 1px solid rgba(31,42,68,0.15);

  /* --- Elevation (shadows) --- */
  --sk-shadow-xs:  0 1px 2px rgba(31,42,68,0.04);
  --sk-shadow-sm:  0 1px 4px rgba(31,42,68,0.06), 0 1px 2px rgba(31,42,68,0.04);
  --sk-shadow-md:  0 4px 12px rgba(31,42,68,0.08), 0 1px 3px rgba(31,42,68,0.04);
  --sk-shadow-lg:  0 8px 24px rgba(31,42,68,0.10), 0 2px 6px rgba(31,42,68,0.04);
  --sk-shadow-xl:  0 16px 48px rgba(31,42,68,0.12), 0 4px 12px rgba(31,42,68,0.04);
  --sk-shadow-2xl: 0 24px 64px rgba(31,42,68,0.16);

  /* --- Transitions --- */
  --sk-ease:       cubic-bezier(0.4, 0, 0.2, 1);
  --sk-ease-in:    cubic-bezier(0.4, 0, 1, 1);
  --sk-ease-out:   cubic-bezier(0, 0, 0.2, 1);
  --sk-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --sk-dur-fast:   150ms;
  --sk-dur-base:   250ms;
  --sk-dur-slow:   400ms;
  --sk-dur-slower: 600ms;

  /* --- Z-index --- */
  --sk-z-dropdown:  100;
  --sk-z-sticky:    200;
  --sk-z-header:    1000;
  --sk-z-overlay:   1100;
  --sk-z-modal:     1200;
  --sk-z-toast:     1300;
  --sk-z-whatsapp:  1400;
}

/* ---------- 2. Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--sk-font);
  font-size: var(--sk-text-base);
  font-weight: var(--sk-fw-regular);
  line-height: var(--sk-leading-normal);
  color: var(--sk-charcoal);
  background-color: var(--sk-white);
  overflow-x: hidden;
}

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

a {
  color: var(--sk-teal);
  text-decoration: none;
  transition: color var(--sk-dur-fast) var(--sk-ease);
}

a:hover { color: var(--sk-navy); }

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--sk-teal);
  outline-offset: 2px;
  border-radius: var(--sk-radius-sm);
}

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

ul, ol { list-style: none; }

/* ---------- 3. Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--sk-font-serif);
  color: var(--sk-navy);
  line-height: var(--sk-leading-tight);
  font-weight: var(--sk-fw-bold);
}

h1 { font-size: var(--sk-text-5xl); letter-spacing: -0.02em; }
h2 { font-size: var(--sk-text-4xl); letter-spacing: -0.015em; }
h3 { font-size: var(--sk-text-3xl); font-weight: var(--sk-fw-semibold); }
h4 { font-size: var(--sk-text-2xl); font-weight: var(--sk-fw-semibold); }
h5 { font-size: var(--sk-text-xl);  font-weight: var(--sk-fw-semibold); }
h6 { font-size: var(--sk-text-lg);  font-weight: var(--sk-fw-medium); }

p { margin-bottom: var(--sk-sp-4); }
p:last-child { margin-bottom: 0; }

.sk-text-xs    { font-size: var(--sk-text-xs); }
.sk-text-sm    { font-size: var(--sk-text-sm); }
.sk-text-base  { font-size: var(--sk-text-base); }
.sk-text-lg    { font-size: var(--sk-text-lg); }
.sk-text-xl    { font-size: var(--sk-text-xl); }
.sk-text-2xl   { font-size: var(--sk-text-2xl); }

.sk-label {
  font-size: var(--sk-text-xs);
  font-weight: var(--sk-fw-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sk-teal);
}

/* ---------- 4. Layout Primitives ---------- */
.sk-container {
  width: 100%;
  max-width: var(--sk-container);
  margin-inline: auto;
  padding-inline: var(--sk-gutter);
}

.sk-container--sm { max-width: var(--sk-container-sm); }
.sk-container--lg { max-width: var(--sk-container-lg); }

.sk-section {
  padding-block: clamp(3rem, 2rem + 4vw, 6rem);
}

.sk-grid {
  display: grid;
  gap: var(--sk-sp-6);
}

.sk-grid--2 { grid-template-columns: repeat(2, 1fr); }
.sk-grid--3 { grid-template-columns: repeat(3, 1fr); }
.sk-grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1023px) {
  .sk-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .sk-grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .sk-grid--4,
  .sk-grid--3,
  .sk-grid--2 { grid-template-columns: 1fr; }
}

.sk-flex {
  display: flex;
  align-items: center;
  gap: var(--sk-sp-4);
}

.sk-flex--between { justify-content: space-between; }
.sk-flex--center  { justify-content: center; }
.sk-flex--wrap    { flex-wrap: wrap; }
.sk-flex--col     { flex-direction: column; align-items: stretch; }

/* ---------- 5. Buttons ---------- */
.sk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sk-sp-2);
  padding: var(--sk-sp-3) var(--sk-sp-6);
  font-family: var(--sk-font);
  font-size: var(--sk-text-sm);
  font-weight: var(--sk-fw-semibold);
  line-height: 1;
  border-radius: var(--sk-radius-md);
  transition: all var(--sk-dur-base) var(--sk-ease);
  white-space: nowrap;
  min-height: 44px;            /* WCAG touch target */
  min-width: 44px;
  position: relative;
  overflow: hidden;
}

.sk-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.15);
  opacity: 0;
  transition: opacity var(--sk-dur-fast) var(--sk-ease);
}

.sk-btn:hover::after { opacity: 1; }
.sk-btn:active { transform: scale(0.97); }

/* Primary */
.sk-btn--primary {
  background: var(--sk-grad-cta);
  color: var(--sk-white);
  box-shadow: 0 2px 8px rgba(63,167,163,0.3);
}

.sk-btn--primary:hover {
  box-shadow: 0 4px 16px rgba(63,167,163,0.4);
  color: var(--sk-white);
  transform: translateY(-1px);
}

/* Secondary */
.sk-btn--secondary {
  background: transparent;
  color: var(--sk-navy);
  border: 1.5px solid var(--sk-navy);
}

.sk-btn--secondary:hover {
  background: var(--sk-navy);
  color: var(--sk-white);
}

/* Ghost */
.sk-btn--ghost {
  background: transparent;
  color: var(--sk-teal);
  padding: var(--sk-sp-2) var(--sk-sp-3);
}

.sk-btn--ghost:hover { background: var(--sk-light-teal); }

/* Sizes */
.sk-btn--sm { padding: var(--sk-sp-2) var(--sk-sp-4); font-size: var(--sk-text-xs); min-height: 36px; }
.sk-btn--lg { padding: var(--sk-sp-4) var(--sk-sp-8); font-size: var(--sk-text-base); min-height: 52px; }

/* ---------- 6. Cards ---------- */
.sk-card {
  background: var(--sk-white);
  border-radius: var(--sk-radius-lg);
  border: var(--sk-border);
  overflow: hidden;
  transition: all var(--sk-dur-base) var(--sk-ease);
}

.sk-card:hover {
  box-shadow: var(--sk-shadow-lg);
  transform: translateY(-4px);
}

.sk-card__img {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  background: var(--sk-soft-blue);
}

.sk-card__body {
  padding: var(--sk-sp-4) var(--sk-sp-5);
}

.sk-card__title {
  font-size: var(--sk-text-base);
  font-weight: var(--sk-fw-semibold);
  color: var(--sk-navy);
  margin-bottom: var(--sk-sp-1);
}

.sk-card__meta {
  font-size: var(--sk-text-sm);
  color: #6B7280;
  margin-bottom: var(--sk-sp-3);
}

.sk-card__price {
  font-size: var(--sk-text-lg);
  font-weight: var(--sk-fw-bold);
  color: var(--sk-navy);
}

.sk-card__price del {
  font-size: var(--sk-text-sm);
  font-weight: var(--sk-fw-regular);
  color: #9CA3AF;
  margin-left: var(--sk-sp-2);
}

/* ---------- 7. Badges ---------- */
.sk-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--sk-sp-1) var(--sk-sp-3);
  font-size: var(--sk-text-xs);
  font-weight: var(--sk-fw-semibold);
  border-radius: var(--sk-radius-full);
  letter-spacing: 0.03em;
}

.sk-badge--bestseller { background: var(--sk-navy);       color: var(--sk-white); }
.sk-badge--new        { background: var(--sk-teal);       color: var(--sk-white); }
.sk-badge--offer      { background: var(--sk-yellow);     color: var(--sk-navy); }
.sk-badge--soldout    { background: #E5E7EB;              color: #6B7280; }

/* ---------- 8. Trust Bar ---------- */
.sk-trust-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sk-sp-4);
  padding: var(--sk-sp-8) 0;
}

@media (max-width: 767px) {
  .sk-trust-bar { grid-template-columns: repeat(2, 1fr); }
}

.sk-trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--sk-sp-2);
  padding: var(--sk-sp-4);
}

.sk-trust-item__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--sk-light-teal);
  border-radius: var(--sk-radius-full);
  color: var(--sk-teal);
}

.sk-trust-item__icon svg { width: 24px; height: 24px; }

.sk-trust-item__label {
  font-size: var(--sk-text-sm);
  font-weight: var(--sk-fw-semibold);
  color: var(--sk-navy);
}

/* ---------- 9. Form Inputs ---------- */
.sk-input {
  width: 100%;
  padding: var(--sk-sp-3) var(--sk-sp-4);
  font-family: var(--sk-font);
  font-size: var(--sk-text-base);
  color: var(--sk-charcoal);
  background: var(--sk-white);
  border: 1.5px solid #D1D5DB;
  border-radius: var(--sk-radius-md);
  transition: border-color var(--sk-dur-fast) var(--sk-ease), box-shadow var(--sk-dur-fast) var(--sk-ease);
  min-height: 44px;
}

.sk-input:hover { border-color: #9CA3AF; }

.sk-input:focus {
  border-color: var(--sk-teal);
  box-shadow: 0 0 0 3px rgba(63,167,163,0.15);
  outline: none;
}

.sk-input::placeholder { color: #9CA3AF; }

.sk-input--error { border-color: var(--sk-error); }
.sk-input--error:focus { box-shadow: 0 0 0 3px rgba(231,76,60,0.15); }

.sk-form-group {
  margin-bottom: var(--sk-sp-5);
}

.sk-form-label {
  display: block;
  margin-bottom: var(--sk-sp-2);
  font-size: var(--sk-text-sm);
  font-weight: var(--sk-fw-medium);
  color: var(--sk-navy);
}

/* ---------- 10. Section Heading ---------- */
.sk-section-heading {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: clamp(2rem, 1rem + 3vw, 3.5rem);
}

.sk-section-heading__label {
  display: block;
  margin-bottom: var(--sk-sp-3);
}

.sk-section-heading__title {
  margin-bottom: var(--sk-sp-3);
}

.sk-section-heading__desc {
  color: #6B7280;
  font-size: var(--sk-text-lg);
  line-height: var(--sk-leading-relaxed);
}

/* ---------- 11. Flow Spine SVG Path ---------- */
.sk-flow-spine {
  position: absolute;
  pointer-events: none;
  overflow: visible;
}

.sk-flow-spine path {
  fill: none;
  stroke: rgba(63,167,163,0.12);
  stroke-width: 2;
  stroke-linecap: round;
}

/* ---------- 12. Animations ---------- */
@keyframes sk-fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes sk-fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes sk-slideRight {
  from { opacity: 0; transform: translateX(-24px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes sk-pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.05); }
}

@keyframes sk-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}

@keyframes sk-shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.sk-animate-fadeUp    { animation: sk-fadeUp 0.6s var(--sk-ease) both; }
.sk-animate-fadeIn    { animation: sk-fadeIn 0.5s var(--sk-ease) both; }
.sk-animate-slideRight { animation: sk-slideRight 0.6s var(--sk-ease) both; }

/* Intersection Observer driven — hidden by default */
[data-sk-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--sk-dur-slow) var(--sk-ease),
              transform var(--sk-dur-slow) var(--sk-ease);
}

[data-sk-reveal].sk-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-sk-reveal="left"] { transform: translateX(-24px); }
[data-sk-reveal="left"].sk-visible { transform: translateX(0); }

[data-sk-reveal="right"] { transform: translateX(24px); }
[data-sk-reveal="right"].sk-visible { transform: translateX(0); }

[data-sk-reveal="scale"] { transform: scale(0.92); }
[data-sk-reveal="scale"].sk-visible { transform: scale(1); }

/* Stagger children */
[data-sk-stagger] > * { transition-delay: calc(var(--sk-stagger-i, 0) * 80ms); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-sk-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 13. Utility Classes ---------- */
.sk-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.sk-text-center { text-align: center; }
.sk-text-navy   { color: var(--sk-navy); }
.sk-text-teal   { color: var(--sk-teal); }
.sk-text-muted  { color: #6B7280; }
.sk-bg-grey     { background: var(--sk-light-grey); }
.sk-bg-teal     { background: var(--sk-light-teal); }
.sk-bg-navy     { background: var(--sk-navy); color: var(--sk-white); }

.sk-mb-0  { margin-bottom: 0; }
.sk-mb-4  { margin-bottom: var(--sk-sp-4); }
.sk-mb-8  { margin-bottom: var(--sk-sp-8); }
.sk-mb-12 { margin-bottom: var(--sk-sp-12); }

.sk-hide-mobile  { display: none; }
@media (min-width: 768px) {
  .sk-hide-mobile  { display: initial; }
  .sk-hide-desktop { display: none; }
}

/* ---------- 14. Skeleton / Loading ---------- */
.sk-skeleton {
  background: linear-gradient(90deg, #F3F4F6 25%, #E5E7EB 50%, #F3F4F6 75%);
  background-size: 200% 100%;
  animation: sk-shimmer 1.5s infinite;
  border-radius: var(--sk-radius-md);
}