/* ============================================================
   NowDesk · Components Library — v1.0
   Requires: tokens.css imported first.
   All classes are prefixed `nd-`.
   ============================================================ */

/* === Buttons ============================================== */
.nd-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--nd-font-body);
  font-size: var(--nd-fs-body-md); line-height: 1;
  font-weight: var(--nd-fw-semibold);
  padding: 12px 20px;
  border-radius: var(--nd-radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--nd-duration-fast) var(--nd-ease-standard),
              border-color var(--nd-duration-fast) var(--nd-ease-standard),
              color var(--nd-duration-fast) var(--nd-ease-standard),
              box-shadow var(--nd-duration-fast) var(--nd-ease-standard);
  white-space: nowrap;
  text-decoration: none;
}
.nd-btn:focus-visible { outline: none; box-shadow: var(--nd-focus-ring); }
.nd-btn:disabled, .nd-btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; }

.nd-btn--primary { background: var(--nd-brand); color: var(--nd-text-on-brand); }
.nd-btn--primary:hover { background: var(--nd-brand-hover); color: var(--nd-text-on-brand); }
.nd-btn--primary:active { background: var(--nd-brand-active); color: var(--nd-text-on-brand); }

.nd-btn--secondary { background: var(--nd-paper); color: var(--nd-text-primary); border-color: var(--nd-border-strong); }
.nd-btn--secondary:hover { background: var(--nd-surface-alt); }

.nd-btn--ghost { background: transparent; color: var(--nd-brand-active); }
.nd-btn--ghost:hover { background: var(--nd-brand-soft); }

.nd-btn--danger { background: var(--nd-danger); color: var(--nd-paper); }
.nd-btn--danger:hover { filter: brightness(.92); }

.nd-btn--sm { font-size: var(--nd-fs-body-sm); padding: 8px 14px; border-radius: var(--nd-radius-sm); }
.nd-btn--lg { font-size: var(--nd-fs-body-lg); padding: 16px 28px; }

/* === Inputs =============================================== */
.nd-input, .nd-textarea, .nd-select {
  display: block;
  width: 100%;
  font-family: var(--nd-font-body);
  font-size: var(--nd-fs-body-md); line-height: var(--nd-lh-body-md);
  color: var(--nd-text-primary);
  background: var(--nd-paper);
  border: 1px solid var(--nd-border-strong);
  border-radius: var(--nd-radius-md);
  padding: 10px 12px;
  transition: border-color var(--nd-duration-fast) var(--nd-ease-standard),
              box-shadow var(--nd-duration-fast) var(--nd-ease-standard);
}
.nd-input:focus, .nd-textarea:focus, .nd-select:focus {
  outline: none; border-color: var(--nd-brand);
  box-shadow: var(--nd-focus-ring);
}
.nd-input::placeholder, .nd-textarea::placeholder { color: var(--nd-ink-300); }
.nd-textarea { min-height: 96px; resize: vertical; }
.nd-select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--nd-ink-500) 50%), linear-gradient(135deg, var(--nd-ink-500) 50%, transparent 50%); background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 36px; }

.nd-label { display: block; font-size: var(--nd-fs-body-sm); font-weight: var(--nd-fw-medium); color: var(--nd-text-secondary); margin-bottom: 6px; }
.nd-help { font-size: var(--nd-fs-caption); color: var(--nd-text-muted); margin-top: 6px; }
.nd-error { font-size: var(--nd-fs-caption); color: var(--nd-danger); margin-top: 6px; }

/* Checkbox / Radio */
.nd-check, .nd-radio {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: var(--nd-fs-body-md); color: var(--nd-text-primary); cursor: pointer;
}
.nd-check input, .nd-radio input { width: 18px; height: 18px; accent-color: var(--nd-brand); cursor: pointer; }

/* Switch */
.nd-switch { position: relative; display: inline-block; width: 40px; height: 22px; }
.nd-switch input { opacity: 0; width: 0; height: 0; }
.nd-switch__slider { position: absolute; inset: 0; background: var(--nd-ink-200); border-radius: var(--nd-radius-full); transition: background var(--nd-duration-fast); cursor: pointer; }
.nd-switch__slider::before { content: ""; position: absolute; height: 16px; width: 16px; left: 3px; top: 3px; background: var(--nd-paper); border-radius: 50%; transition: transform var(--nd-duration-fast); }
.nd-switch input:checked + .nd-switch__slider { background: var(--nd-brand); }
.nd-switch input:checked + .nd-switch__slider::before { transform: translateX(18px); }

/* === Cards ================================================ */
.nd-card {
  background: var(--nd-paper);
  border: 1px solid var(--nd-border);
  border-radius: var(--nd-radius-lg);
  padding: var(--nd-space-6);
  box-shadow: var(--nd-shadow-sm);
}
.nd-card--elevated { box-shadow: var(--nd-shadow-md); border-color: transparent; }
.nd-card--deep { background: var(--nd-surface-deep); color: var(--nd-paper); border-color: transparent; }
.nd-card--deep h1, .nd-card--deep h2, .nd-card--deep h3 { color: var(--nd-paper); }

.nd-kpi { display: flex; flex-direction: column; gap: 4px; }
.nd-kpi__label { font-size: var(--nd-fs-caption); text-transform: uppercase; letter-spacing: 0.06em; color: var(--nd-text-muted); }
.nd-kpi__value { font-family: var(--nd-font-display); font-size: var(--nd-fs-display-md); line-height: 1; font-weight: var(--nd-fw-semibold); color: var(--nd-text-primary); letter-spacing: -0.02em; }
.nd-kpi__delta { font-size: var(--nd-fs-body-sm); color: var(--nd-success); }
.nd-kpi__delta--down { color: var(--nd-danger); }

/* === Navigation =========================================== */
.nd-topnav { display: flex; align-items: center; gap: var(--nd-space-6); padding: var(--nd-space-4) var(--nd-space-6); background: var(--nd-paper); border-bottom: 1px solid var(--nd-border); }
.nd-topnav__brand { display: flex; align-items: center; gap: 10px; font-family: var(--nd-font-display); font-weight: var(--nd-fw-semibold); font-size: var(--nd-fs-heading-sm); }
.nd-topnav__links { display: flex; gap: var(--nd-space-4); margin-left: var(--nd-space-6); }
.nd-topnav__link { color: var(--nd-text-secondary); text-decoration: none; font-size: var(--nd-fs-body-md); padding: 8px 4px; border-bottom: 2px solid transparent; }
.nd-topnav__link:hover { color: var(--nd-text-primary); }
.nd-topnav__link--active { color: var(--nd-text-primary); border-bottom-color: var(--nd-brand); }

.nd-tabs { display: flex; gap: var(--nd-space-2); border-bottom: 1px solid var(--nd-border); }
.nd-tab { padding: 10px 16px; font-size: var(--nd-fs-body-md); color: var(--nd-text-secondary); border: none; background: transparent; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.nd-tab:hover { color: var(--nd-text-primary); }
.nd-tab--active { color: var(--nd-brand); border-bottom-color: var(--nd-brand); font-weight: var(--nd-fw-semibold); }

.nd-breadcrumb { display: flex; align-items: center; gap: 8px; font-size: var(--nd-fs-body-sm); color: var(--nd-text-muted); }
.nd-breadcrumb a { color: var(--nd-text-secondary); text-decoration: none; }
.nd-breadcrumb a:hover { color: var(--nd-text-primary); }
.nd-breadcrumb__sep { color: var(--nd-ink-300); }

/* === Feedback ============================================= */
.nd-alert {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px 16px;
  border-radius: var(--nd-radius-md);
  border-left: 3px solid;
  background: var(--nd-paper);
  font-size: var(--nd-fs-body-md);
}
.nd-alert--info    { background: #F0F8FE; border-color: var(--nd-info); color: var(--nd-text-primary); }
.nd-alert--success { background: #F0FAF4; border-color: var(--nd-success); }
.nd-alert--warning { background: #FEF8EC; border-color: var(--nd-warning); }
.nd-alert--danger  { background: #FEF2F2; border-color: var(--nd-danger); }
.nd-alert__title { font-weight: var(--nd-fw-semibold); margin-bottom: 2px; }

.nd-toast { position: fixed; bottom: 24px; right: 24px; background: var(--nd-ink-900); color: var(--nd-paper); padding: 14px 18px; border-radius: var(--nd-radius-md); box-shadow: var(--nd-shadow-lg); font-size: var(--nd-fs-body-md); z-index: 999; }

.nd-tooltip { position: relative; display: inline-block; }
.nd-tooltip__content { visibility: hidden; opacity: 0; position: absolute; bottom: calc(100% + 8px); left: 50%; transform: translateX(-50%); background: var(--nd-ink-900); color: var(--nd-paper); padding: 6px 10px; border-radius: var(--nd-radius-sm); font-size: var(--nd-fs-caption); white-space: nowrap; transition: opacity var(--nd-duration-fast); pointer-events: none; }
.nd-tooltip:hover .nd-tooltip__content { visibility: visible; opacity: 1; }

/* === Data display ========================================= */
.nd-badge { display: inline-flex; align-items: center; padding: 2px 10px; border-radius: var(--nd-radius-full); font-size: var(--nd-fs-caption); font-weight: var(--nd-fw-medium); background: var(--nd-ink-50); color: var(--nd-text-secondary); }
.nd-badge--brand   { background: var(--nd-brand-soft); color: var(--nd-brand-active); }
.nd-badge--success { background: #DCFCE7; color: #15803D; }
.nd-badge--warning { background: #FEF3C7; color: #92400E; }
.nd-badge--danger  { background: #FEE2E2; color: #991B1B; }

.nd-chip { display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; border-radius: var(--nd-radius-full); background: var(--nd-surface-alt); border: 1px solid var(--nd-border); font-size: var(--nd-fs-body-sm); color: var(--nd-text-primary); }
.nd-chip--selected { background: var(--nd-brand-soft); border-color: var(--nd-blue-200); color: var(--nd-brand-active); }

.nd-avatar { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: var(--nd-brand-soft); color: var(--nd-brand-active); font-weight: var(--nd-fw-semibold); font-size: var(--nd-fs-body-sm); }
.nd-avatar--sm { width: 24px; height: 24px; font-size: var(--nd-fs-caption); }
.nd-avatar--lg { width: 48px; height: 48px; font-size: var(--nd-fs-body-md); }

.nd-progress { width: 100%; height: 6px; background: var(--nd-ink-100); border-radius: var(--nd-radius-full); overflow: hidden; }
.nd-progress__bar { height: 100%; background: var(--nd-brand); transition: width var(--nd-duration-normal) var(--nd-ease-standard); }

.nd-table { width: 100%; border-collapse: collapse; font-size: var(--nd-fs-body-md); }
.nd-table th { text-align: left; font-weight: var(--nd-fw-semibold); color: var(--nd-text-secondary); font-size: var(--nd-fs-body-sm); padding: 12px 16px; border-bottom: 1px solid var(--nd-border-strong); }
.nd-table td { padding: 14px 16px; border-bottom: 1px solid var(--nd-border); color: var(--nd-text-primary); }
.nd-table tr:hover td { background: var(--nd-surface-alt); }

/* === Overlay ============================================== */
.nd-modal-backdrop { position: fixed; inset: 0; background: rgba(14, 26, 43, 0.5); display: flex; align-items: center; justify-content: center; z-index: 100; }
.nd-modal { background: var(--nd-paper); border-radius: var(--nd-radius-lg); box-shadow: var(--nd-shadow-xl); width: min(560px, 90vw); padding: var(--nd-space-8); }
.nd-modal__title { font-family: var(--nd-font-display); font-size: var(--nd-fs-heading-md); font-weight: var(--nd-fw-semibold); margin-bottom: 8px; }
.nd-modal__actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: var(--nd-space-6); }

/* === Utility ============================================== */
.nd-divider { height: 1px; background: var(--nd-border); border: none; margin: var(--nd-space-6) 0; }

.nd-empty { text-align: center; padding: var(--nd-space-12) var(--nd-space-6); color: var(--nd-text-muted); }
.nd-empty__title { font-size: var(--nd-fs-heading-sm); color: var(--nd-text-primary); margin-bottom: 6px; }

.nd-skeleton { background: linear-gradient(90deg, var(--nd-ink-100) 0%, var(--nd-ink-50) 50%, var(--nd-ink-100) 100%); background-size: 200% 100%; animation: nd-skel 1.4s linear infinite; border-radius: var(--nd-radius-sm); }
@keyframes nd-skel { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* === Type utility classes ================================= */
.nd-display-xl { font-family: var(--nd-font-display); font-size: var(--nd-fs-display-xl); line-height: var(--nd-lh-display-xl); font-weight: var(--nd-fw-semibold); letter-spacing: -0.02em; }
.nd-display-lg { font-family: var(--nd-font-display); font-size: var(--nd-fs-display-lg); line-height: var(--nd-lh-display-lg); font-weight: var(--nd-fw-semibold); letter-spacing: -0.02em; }
.nd-display-md { font-family: var(--nd-font-display); font-size: var(--nd-fs-display-md); line-height: var(--nd-lh-display-md); font-weight: var(--nd-fw-semibold); letter-spacing: -0.02em; }
.nd-heading-lg { font-family: var(--nd-font-display); font-size: var(--nd-fs-heading-lg); line-height: var(--nd-lh-heading-lg); font-weight: var(--nd-fw-semibold); letter-spacing: -0.02em; }
.nd-heading-md { font-family: var(--nd-font-display); font-size: var(--nd-fs-heading-md); line-height: var(--nd-lh-heading-md); font-weight: var(--nd-fw-semibold); }
.nd-heading-sm { font-family: var(--nd-font-display); font-size: var(--nd-fs-heading-sm); line-height: var(--nd-lh-heading-sm); font-weight: var(--nd-fw-semibold); }
.nd-body-lg { font-size: var(--nd-fs-body-lg); line-height: var(--nd-lh-body-lg); }
.nd-body-md { font-size: var(--nd-fs-body-md); line-height: var(--nd-lh-body-md); }
.nd-body-sm { font-size: var(--nd-fs-body-sm); line-height: var(--nd-lh-body-sm); }
.nd-caption { font-size: var(--nd-fs-caption); line-height: var(--nd-lh-caption); }
.nd-text-secondary { color: var(--nd-text-secondary); }
.nd-text-muted { color: var(--nd-text-muted); }
.nd-text-brand { color: var(--nd-brand); }