/* ==========================================================================
   DEVSTUDIO — GLOBAL DESIGN SYSTEM & FOUNDATION
   Precision Retail E-Commerce Stylesheet
   ========================================================================== */

/* 1. CSS Custom Properties / Design Tokens */
:root {
  /* Brand Core Colors (Dynamically overwriteable via JS & site_settings) */
  --ds-brand-primary: #0b0c10;
  --ds-brand-secondary: #1f2833;
  --ds-brand-accent: #0066cc;
  --ds-brand-accent-hover: #0052a3;
  --ds-brand-accent-subtle: #e8f2fc;
  
  /* Neutral Palette */
  --ds-color-black: #000000;
  --ds-color-gray-950: #0a0a0c;
  --ds-color-gray-900: #121316;
  --ds-color-gray-800: #1c1e24;
  --ds-color-gray-700: #2d3139;
  --ds-color-gray-600: #4a505c;
  --ds-color-gray-500: #6c7584;
  --ds-color-gray-400: #9aa1ae;
  --ds-color-gray-300: #cfd4dc;
  --ds-color-gray-200: #e4e7ec;
  --ds-color-gray-100: #f2f4f7;
  --ds-color-gray-50: #f8f9fa;
  --ds-color-white: #ffffff;

  /* Semantic Feedback & Status */
  --ds-color-success: #0e8345;
  --ds-color-success-bg: #eaf7ee;
  --ds-color-warning: #b54708;
  --ds-color-warning-bg: #fffaeb;
  --ds-color-danger: #d92d20;
  --ds-color-danger-bg: #fef3f2;
  --ds-color-info: #026aa2;
  --ds-color-info-bg: #f0f9ff;

  /* Surfaces & Backgrounds */
  --ds-bg-page: #ffffff;
  --ds-bg-surface: #ffffff;
  --ds-bg-surface-secondary: #f8f9fa;
  --ds-bg-surface-tertiary: #f2f4f7;
  --ds-bg-dark: #0a0a0c;
  --ds-bg-dark-surface: #14151a;

  /* Text Colors */
  --ds-text-primary: #121316;
  --ds-text-secondary: #4a505c;
  --ds-text-tertiary: #6c7584;
  --ds-text-muted: #9aa1ae;
  --ds-text-inverse: #ffffff;
  --ds-text-inverse-muted: #cfd4dc;

  /* Borders & Dividers */
  --ds-border-subtle: #e4e7ec;
  --ds-border-default: #d0d5dd;
  --ds-border-strong: #9aa1ae;
  --ds-border-dark: #242731;

  /* Typography */
  --ds-font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --ds-font-mono: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --ds-font-weight-regular: 400;
  --ds-font-weight-medium: 500;
  --ds-font-weight-semibold: 600;
  --ds-font-weight-bold: 700;

  /* Shadows */
  --ds-shadow-xs: 0 1px 2px rgba(16, 24, 40, 0.04);
  --ds-shadow-sm: 0 2px 4px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --ds-shadow-md: 0 4px 12px rgba(16, 24, 40, 0.08), 0 2px 4px rgba(16, 24, 40, 0.04);
  --ds-shadow-lg: 0 12px 24px rgba(16, 24, 40, 0.1), 0 4px 8px rgba(16, 24, 40, 0.05);
  --ds-shadow-xl: 0 20px 40px rgba(16, 24, 40, 0.14), 0 8px 16px rgba(16, 24, 40, 0.06);

  /* Radii */
  --ds-radius-xs: 4px;
  --ds-radius-sm: 6px;
  --ds-radius-md: 8px;
  --ds-radius-lg: 12px;
  --ds-radius-xl: 16px;
  --ds-radius-full: 9999px;

  /* Transitions */
  --ds-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --ds-transition-base: 240ms cubic-bezier(0.4, 0, 0.2, 1);
  --ds-transition-smooth: 350ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout Constraints */
  --ds-container-max: 1360px;
  --ds-container-padding: 24px;
  --ds-header-height: 64px;
  --ds-announcement-height: 40px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--ds-font-sans);
  font-size: 0.9375rem; /* 15px */
  line-height: 1.55;
  color: var(--ds-text-primary);
  background-color: var(--ds-bg-page);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

main {
  flex: 1 0 auto;
}

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

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--ds-transition-fast);
}

ul, ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

:focus-visible {
  outline: 2px solid var(--ds-brand-accent);
  outline-offset: 2px;
}

/* 3. Global Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--ds-text-primary);
  font-weight: var(--ds-font-weight-bold);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 4vw + 1rem, 3.5rem); }
h2 { font-size: clamp(1.75rem, 2.5vw + 0.5rem, 2.375rem); }
h3 { font-size: clamp(1.25rem, 1.5vw + 0.5rem, 1.5rem); }
h4 { font-size: 1.125rem; font-weight: var(--ds-font-weight-semibold); }
h5 { font-size: 1rem; font-weight: var(--ds-font-weight-semibold); }
h6 { font-size: 0.875rem; font-weight: var(--ds-font-weight-semibold); letter-spacing: 0.05em; text-transform: uppercase; }

p {
  color: var(--ds-text-secondary);
}

.section-kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: var(--ds-font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ds-brand-accent);
  margin-bottom: 0.5rem;
}

.text-white-muted {
  color: rgba(255, 255, 255, 0.7) !important;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: var(--ds-font-weight-semibold);
  color: var(--ds-brand-accent);
  transition: transform var(--ds-transition-fast), color var(--ds-transition-fast);
}

.link-arrow:hover {
  color: var(--ds-brand-accent-hover);
  transform: translateX(3px);
}

/* 4. Layout Container */
.site-container {
  width: 100%;
  max-width: var(--ds-container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--ds-container-padding);
  padding-right: var(--ds-container-padding);
}

.section {
  padding-top: clamp(48px, 6vw, 88px);
  padding-bottom: clamp(48px, 6vw, 88px);
}

.section-header-compact {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.section-header-centered {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3rem auto;
}

.section-heading {
  margin-top: 0.25rem;
  margin-bottom: 0.5rem;
}

.section-subheading {
  font-size: 1.0625rem;
  color: var(--ds-text-secondary);
}

/* 5. Buttons & Interactive Elements */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: var(--ds-font-weight-medium);
  padding: 10px 20px;
  border-radius: var(--ds-radius-sm);
  transition: background-color var(--ds-transition-fast), border-color var(--ds-transition-fast), color var(--ds-transition-fast), transform var(--ds-transition-fast);
  white-space: nowrap;
  user-select: none;
  text-align: center;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--ds-brand-accent);
  color: var(--ds-color-white);
  border: 1px solid var(--ds-brand-accent);
}

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

.btn-secondary {
  background-color: var(--ds-color-gray-900);
  color: var(--ds-color-white);
  border: 1px solid var(--ds-color-gray-900);
}

.btn-secondary:hover {
  background-color: var(--ds-color-black);
  border-color: var(--ds-color-black);
  color: var(--ds-color-white);
}

.btn-outline {
  background-color: transparent;
  color: var(--ds-text-primary);
  border: 1px solid var(--ds-border-default);
}

.btn-outline:hover {
  border-color: var(--ds-text-primary);
  background-color: var(--ds-color-gray-50);
}

.btn-outline-light {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--ds-color-white);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
}

.btn-outline-light:hover {
  background-color: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--ds-color-white);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: var(--ds-font-weight-semibold);
}

.btn-full {
  width: 100%;
}

.btn:disabled, .btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

/* 6. Form Controls & Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: var(--ds-font-weight-semibold);
  color: var(--ds-text-primary);
  margin-bottom: 6px;
}

.form-label .required-indicator {
  color: var(--ds-color-danger);
  margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.9375rem;
  border-radius: var(--ds-radius-sm);
  border: 1px solid var(--ds-border-default);
  background-color: var(--ds-color-white);
  color: var(--ds-text-primary);
  transition: border-color var(--ds-transition-fast), box-shadow var(--ds-transition-fast);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--ds-border-strong);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--ds-brand-accent);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--ds-text-muted);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--ds-text-tertiary);
  margin-top: 4px;
}

.form-error-msg {
  font-size: 0.75rem;
  color: var(--ds-color-danger);
  margin-top: 4px;
}

/* 7. Status Badges & Pills */
.badge-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  font-size: 0.6875rem;
  font-weight: var(--ds-font-weight-bold);
  border-radius: var(--ds-radius-full);
  background-color: var(--ds-brand-accent);
  color: var(--ds-color-white);
  line-height: 1;
}

.product-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  font-size: 0.6875rem;
  font-weight: var(--ds-font-weight-bold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--ds-radius-xs);
  line-height: 1.2;
}

.badge-new {
  background-color: var(--ds-brand-accent);
  color: var(--ds-color-white);
}

.badge-popular {
  background-color: var(--ds-color-gray-900);
  color: var(--ds-color-white);
}

.badge-flagship {
  background-color: #5856d6;
  color: var(--ds-color-white);
}

.badge-sale {
  background-color: var(--ds-color-danger);
  color: var(--ds-color-white);
}

/* 8. Feedback Banners & Alerts */
.alert {
  padding: 12px 16px;
  border-radius: var(--ds-radius-sm);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.alert-success {
  background-color: var(--ds-color-success-bg);
  border: 1px solid rgba(14, 131, 69, 0.2);
  color: var(--ds-color-success);
}

.alert-danger {
  background-color: var(--ds-color-danger-bg);
  border: 1px solid rgba(217, 45, 32, 0.2);
  color: var(--ds-color-danger);
}

.alert-warning {
  background-color: var(--ds-color-warning-bg);
  border: 1px solid rgba(181, 71, 8, 0.2);
  color: var(--ds-color-warning);
}

/* 9. Skeletons & Loading UI */
.skeleton {
  background: linear-gradient(90deg, #f2f4f7 25%, #e4e7ec 50%, #f2f4f7 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--ds-radius-xs);
}

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

.skeleton-text {
  height: 14px;
  margin-bottom: 8px;
  width: 100%;
}

.skeleton-card {
  height: 380px;
  width: 100%;
  border-radius: var(--ds-radius-md);
}

/* 10. Drawer & Modal Overlays (Global Shared Classes) */
.drawer-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--ds-radius-full);
  color: var(--ds-text-secondary);
  transition: background-color var(--ds-transition-fast), color var(--ds-transition-fast);
}

.drawer-close-btn:hover {
  background-color: var(--ds-color-gray-100);
  color: var(--ds-text-primary);
}

body.drawer-open {
  overflow: hidden;
}

/* 11. Screen Reader Accessibility Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}
/* Skeleton shimmer is decoration only — respect reduced-motion users. */
@media (prefers-reduced-motion: reduce) {
  .skeleton {
    animation: none;
  }
}