/* ============================================
   W STYLE — Design System
   Modern Minimalist Fashion E-Commerce
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400&family=Inter:wght@300;400;500;600&display=swap');

/* ============================================
   CSS Custom Properties
============================================ */
:root {
  /* Colors */
  --white:        #FFFFFF;
  --black:        #1C1C1C;
  --gray-50:      #FAFAFA;
  --gray-100:     #F5F5F5;
  --gray-200:     #EBEBEB;
  --gray-300:     #D6D6D6;
  --gray-400:     #ABABAB;
  --gray-500:     #737373;
  --gray-600:     #555555;
  --gray-700:     #3D3D3D;
  --gray-800:     #2A2A2A;
  --gray-900:     #1C1C1C;

  --accent:       #C4A882;  /* champagne gold */
  --accent-dark:  #A08060;
  --accent-light: #EAD9C4;

  --error:   #C53030;
  --success: #276749;

  /* Typography */
  --font-serif: 'Cormorant Garamond', 'Times New Roman', serif;
  --font-sans:  'Inter', 'Microsoft JhengHei', '微軟正黑體', sans-serif;

  --text-xs:   0.6875rem;  /* 11px */
  --text-sm:   0.8125rem;  /* 13px */
  --text-base: 0.9375rem;  /* 15px */
  --text-md:   1rem;       /* 16px */
  --text-lg:   1.125rem;   /* 18px */
  --text-xl:   1.375rem;   /* 22px */
  --text-2xl:  1.625rem;   /* 26px */
  --text-3xl:  2.25rem;    /* 36px */
  --text-4xl:  3rem;       /* 48px */
  --text-5xl:  4rem;       /* 64px */
  --text-6xl:  5.5rem;     /* 88px */

  /* Spacing */
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3:  12px;
  --sp-4:  16px;
  --sp-5:  20px;
  --sp-6:  24px;
  --sp-8:  32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-20: 80px;
  --sp-24: 96px;
  --sp-32: 128px;

  /* Layout */
  --container-max:  1440px;
  --container-pad:  48px;
  --header-height:  112px;

  /* Borders */
  --border:        1px solid var(--gray-200);
  --border-mid:    1px solid var(--gray-300);
  --border-dark:   1px solid var(--gray-800);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.07);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.10);
  --shadow-xl: 0 32px 80px rgba(0,0,0,0.12);

  /* Transitions */
  --ease:        cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-out:    cubic-bezier(0, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:    150ms;
  --dur-base:    250ms;
  --dur-slow:    400ms;
  --dur-slower:  600ms;
}

/* ============================================
   Reset
============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--black);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; font-size: inherit; color: inherit; }
input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
ul, ol { list-style: none; }

/* ============================================
   Container
============================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}
.container-sm {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--container-pad);
}
.container-xs {
  max-width: 560px;
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ============================================
   Grid
============================================ */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-8); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-6); }

/* ============================================
   Typography
============================================ */
.serif { font-family: var(--font-serif); }

.section-eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: var(--sp-3);
}
.section-title {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: 300;
  letter-spacing: 0.08em;
  line-height: 1.2;
}
.section-header {
  text-align: center;
  margin-bottom: var(--sp-12);
}

/* ============================================
   Buttons
============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 12px 32px;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--dur-base) var(--ease);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}
.btn:hover::after { opacity: 1; }

.btn-primary {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}
.btn-primary:hover {
  background: var(--gray-800);
  border-color: var(--gray-800);
}

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

.btn-white {
  background: var(--white);
  color: var(--black);
  border-color: var(--white);
}
.btn-white:hover { background: var(--gray-100); }

.btn-ghost {
  padding: 0;
  border: none;
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: underline;
  text-underline-offset: 4px;
  color: var(--gray-600);
}
.btn-ghost:hover { color: var(--black); }

.btn-sm { padding: 9px 20px; font-size: var(--text-xs); }
.btn-lg { padding: 16px 48px; font-size: var(--text-sm); }
.btn-full { width: 100%; }

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* ============================================
   Forms
============================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.form-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-700);
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: var(--border-mid);
  background: var(--white);
  font-size: var(--text-base);
  outline: none;
  transition: border-color var(--dur-fast) var(--ease);
  appearance: none;
  border-radius: 0;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--black);
}
.form-input::placeholder, .form-textarea::placeholder {
  color: var(--gray-400);
}
.form-input.error, .form-select.error { border-color: var(--error); }
.form-hint {
  font-size: var(--text-xs);
  color: var(--gray-500);
}
.form-error {
  font-size: var(--text-xs);
  color: var(--error);
}

/* Checkbox */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  cursor: pointer;
}
.checkbox-group input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--black);
  cursor: pointer;
}

/* ============================================
   Badges
============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.badge-new  { background: var(--black); color: var(--white); }
.badge-sale { background: var(--error); color: var(--white); }
.badge-best { background: var(--accent); color: var(--white); }
.badge-out  { background: var(--gray-300); color: var(--gray-600); }

/* ============================================
   Dividers
============================================ */
.divider { border: none; border-top: var(--border); margin: var(--sp-6) 0; }
.divider-text {
  display: flex; align-items: center; gap: var(--sp-4);
  color: var(--gray-400); font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: uppercase;
}
.divider-text::before, .divider-text::after {
  content: ''; flex: 1; border-top: var(--border);
}

/* ============================================
   Toast Notification
============================================ */
#toast-container {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: 14px 20px;
  background: var(--black);
  color: var(--white);
  font-size: var(--text-sm);
  min-width: 280px;
  box-shadow: var(--shadow-lg);
  animation: toastIn var(--dur-slow) var(--ease) both;
  pointer-events: auto;
}
.toast.success { background: var(--success); }
.toast.error   { background: var(--error); }
.toast.leaving { animation: toastOut var(--dur-base) var(--ease) both; }
.toast-icon { font-size: 18px; flex-shrink: 0; }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(24px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(24px); }
}

/* ============================================
   Modal
============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease);
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}
.modal {
  background: var(--white);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--sp-10);
  transform: scale(0.96);
  transition: transform var(--dur-base) var(--ease);
}
.modal-overlay.active .modal { transform: scale(1); }

/* ============================================
   Page Loader
============================================ */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--white);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--dur-slow) var(--ease);
}
.page-loader.loaded { opacity: 0; pointer-events: none; }
.loader-text {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  letter-spacing: 0.4em;
  text-transform: uppercase;
  animation: loaderPulse 1.5s ease-in-out infinite;
}
@keyframes loaderPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}

/* ============================================
   Scroll Reveal
============================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slower) var(--ease), transform var(--dur-slower) var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============================================
   Scrollbar
============================================ */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-500); }

/* ============================================
   Selection
============================================ */
::selection { background: var(--accent-light); color: var(--black); }

/* ============================================
   Animations
============================================ */
@keyframes fadeIn    { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideLeft { from { transform: translateX(100%); } to { transform: translateX(0); } }
@keyframes slideOut  { from { transform: translateX(0); } to { transform: translateX(100%); } }
@keyframes spin      { to { transform: rotate(360deg); } }

/* ============================================
   Responsive
============================================ */
@media (max-width: 1200px) {
  :root { --container-pad: 32px; }
  .grid-4 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 900px) {
  :root { --container-pad: 24px; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .section-title { font-size: var(--text-2xl); }
}
@media (max-width: 600px) {
  :root { --container-pad: 16px; }
}
@media (max-width: 480px) {
  .grid-3, .grid-4 { gap: var(--sp-3); }
}