/* FreshOps Design System v1 */
/* sees/ui/shared/design-system.css */
/* 2026-03-06 | Team B */

:root {
  /* ── Colors ── */
  --color-primary:        #2563EB;
  --color-primary-hover:  #1D4ED8;
  --color-primary-light:  #EFF6FF;

  --color-success:        #16A34A;
  --color-success-light:  #F0FDF4;
  --color-warning:        #D97706;
  --color-warning-light:  #FFFBEB;
  --color-danger:         #DC2626;
  --color-danger-light:   #FEF2F2;

  --color-neutral-0:      #FFFFFF;
  --color-neutral-50:     #F9FAFB;
  --color-neutral-100:    #F3F4F6;
  --color-neutral-200:    #E5E7EB;
  --color-neutral-400:    #9CA3AF;
  --color-neutral-600:    #4B5563;
  --color-neutral-800:    #1F2937;
  --color-neutral-900:    #111827;

  /* ── Spacing (4px base) ── */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* ── Typography ── */
  --font-base: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs:   12px;
  --text-sm:   14px;
  --text-base: 16px;
  --text-lg:   18px;
  --text-xl:   20px;
  --text-2xl:  24px;
  --text-3xl:  30px;

  --weight-normal:   400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;

  --leading-tight:  1.25;
  --leading-normal: 1.5;
  --leading-loose:  1.75;

  /* ── Border radius ── */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-full: 9999px;

  /* ── Shadows ── */
  --shadow-sm:  0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-md:  0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);

  /* ── Transitions ── */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;

  /* ── Layout ── */
  --container-max: 1280px;
  --sidebar-width: 240px;
  --header-height: 60px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-base);
  font-size: var(--text-base);
  color: var(--color-neutral-900);
  background: var(--color-neutral-50);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
}

/* ── Utility classes ── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}

/* ── Button ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid transparent; border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: var(--weight-medium);
  line-height: var(--leading-tight);
  cursor: pointer; transition: background var(--transition-fast), opacity var(--transition-fast);
  text-decoration: none; white-space: nowrap;
}
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
.btn--primary   { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--secondary { background: var(--color-neutral-0); color: var(--color-neutral-800); border-color: var(--color-neutral-200); }
.btn--secondary:hover { background: var(--color-neutral-100); }
.btn--danger    { background: var(--color-danger); color: #fff; border-color: var(--color-danger); }
.btn--lg { padding: var(--space-3) var(--space-6); font-size: var(--text-base); }
.btn--sm { padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
.btn--loading { pointer-events: none; }
.btn--loading::after {
  content: ''; width: 14px; height: 14px; border: 2px solid currentColor;
  border-top-color: transparent; border-radius: 50%;
  animation: btn-spin 0.6s linear infinite;
}
@keyframes btn-spin { to { transform: rotate(360deg); } }

/* ── Input ── */
.input-group { display: flex; flex-direction: column; gap: var(--space-1); }
.input-label { font-size: var(--text-sm); font-weight: var(--weight-medium); color: var(--color-neutral-700, #374151); }
.input {
  width: 100%; padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-neutral-200); border-radius: var(--radius-md);
  font-size: var(--text-sm); color: var(--color-neutral-900);
  background: var(--color-neutral-0);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-light); }
.input--error { border-color: var(--color-danger); }
.input--error:focus { box-shadow: 0 0 0 3px var(--color-danger-light); }
.input-error-msg { font-size: var(--text-xs); color: var(--color-danger); }

/* ── Card ── */
.card {
  background: var(--color-neutral-0); border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg); padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.card__title { font-size: var(--text-lg); font-weight: var(--weight-semibold); margin-bottom: var(--space-4); }
.card--loading { position: relative; pointer-events: none; }
.card--loading::after {
  content: ''; position: absolute; inset: 0; background: rgba(255,255,255,0.7);
  border-radius: inherit; display: flex; align-items: center; justify-content: center;
}

/* ── Alert ── */
.alert {
  display: flex; gap: var(--space-3); padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md); font-size: var(--text-sm); border: 1px solid;
}
.alert--success { background: var(--color-success-light); color: var(--color-success); border-color: var(--color-success); }
.alert--warning { background: var(--color-warning-light); color: var(--color-warning); border-color: var(--color-warning); }
.alert--danger  { background: var(--color-danger-light);  color: var(--color-danger);  border-color: var(--color-danger); }
.alert--info    { background: var(--color-primary-light); color: var(--color-primary); border-color: var(--color-primary); }

/* ── Empty state ── */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: var(--space-12); text-align: center; color: var(--color-neutral-400);
}
.empty-state__title { font-size: var(--text-lg); font-weight: var(--weight-medium); margin-bottom: var(--space-2); }
.empty-state__desc  { font-size: var(--text-sm); }

/* ── Loading skeleton ── */
.skeleton {
  background: linear-gradient(90deg, var(--color-neutral-100) 25%, var(--color-neutral-200) 50%, var(--color-neutral-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-wave 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-wave { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ── Responsive ── */
@media (max-width: 768px) {
  :root { --sidebar-width: 0px; }
}