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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--txt-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

body.no-scroll { overflow: hidden; }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }
ul, ol { list-style: none; }

/* ─── Typography ─── */
h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; line-height: 1.2; }
h3 { font-size: 1.125rem; font-weight: 600; }
h4 { font-size: 1rem; font-weight: 600; }

.text-gradient {
  background: linear-gradient(135deg, var(--clr-cyan) 0%, var(--clr-violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Layout ─── */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

.view {
  display: none;
  min-height: calc(100vh - var(--navbar-h));
  padding-top: var(--navbar-h);
  animation: viewFadeIn var(--t-base) ease;
}
.view.active { display: block; }

@keyframes viewFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.section {
  padding: var(--sp-20) 0;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--sp-10);
  gap: var(--sp-4);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
}

.section-sub {
  color: var(--txt-secondary);
  margin-top: var(--sp-2);
  font-size: 0.95rem;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--t-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.06);
  opacity: 0;
  transition: opacity var(--t-fast);
}
.btn:hover::before { opacity: 1; }

.btn--primary {
  background: linear-gradient(135deg, var(--clr-cyan) 0%, var(--clr-violet) 100%);
  color: var(--bg-base);
  box-shadow: 0 0 20px rgba(0,245,255,0.25);
}
.btn--primary:hover {
  box-shadow: 0 0 30px rgba(0,245,255,0.40), 0 0 60px rgba(168,85,247,0.20);
  transform: translateY(-1px);
}
.btn--primary:active { transform: translateY(0); }

.btn--ghost {
  color: var(--txt-secondary);
  border: 1px solid var(--border-muted);
}
.btn--ghost:hover {
  color: var(--txt-primary);
  border-color: var(--border-cyan);
  background: var(--clr-cyan-glow);
}

.btn--outline {
  color: var(--clr-cyan);
  border: 1px solid var(--border-cyan);
  background: transparent;
}
.btn--outline:hover {
  background: var(--clr-cyan-glow);
  box-shadow: var(--shadow-cyan);
}

.btn--danger {
  color: var(--clr-danger);
  border: 1px solid rgba(239,68,68,0.3);
}
.btn--danger:hover {
  background: rgba(239,68,68,0.1);
}

.btn--full { width: 100%; justify-content: center; }

.btn--lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius-md); }
.btn--sm { padding: 7px 14px; font-size: 0.8rem; }
.btn--xs { padding: 4px 10px; font-size: 0.75rem; }

.btn:disabled {
  opacity: 0.4;
  pointer-events: none;
}

.btn svg, .btn [data-lucide] {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
.btn--lg svg, .btn--lg [data-lucide] { width: 18px; height: 18px; }

/* Icon button */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--txt-secondary);
  transition: all var(--t-fast);
  background: transparent;
  border: 1px solid transparent;
}
.icon-btn:hover {
  color: var(--clr-cyan);
  background: var(--clr-cyan-glow);
  border-color: var(--border-cyan);
}
.icon-btn svg, .icon-btn [data-lucide] { width: 18px; height: 18px; }

/* ─── Badge / Tags ─── */
.badge-neon {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--clr-cyan-glow);
  border: 1px solid var(--border-cyan);
  color: var(--clr-cyan);
}

.tag-free {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  background: rgba(34,197,94,0.15);
  border: 1px solid rgba(34,197,94,0.30);
  color: var(--clr-success);
  letter-spacing: 0.05em;
}

.tag-stock {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
}
.tag-stock--in {
  background: rgba(34,197,94,0.10);
  border: 1px solid rgba(34,197,94,0.25);
  color: var(--clr-success);
}
.tag-stock--out {
  background: rgba(239,68,68,0.10);
  border: 1px solid rgba(239,68,68,0.25);
  color: var(--clr-danger);
}
.tag-stock::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ─── Skeleton loader ─── */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-surface-2) 25%,
    var(--bg-surface-3) 50%,
    var(--bg-surface-2) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.6s infinite;
  border-radius: var(--radius-md);
}

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

.skeleton-card {
  height: 380px;
  border-radius: var(--radius-lg);
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--sp-6);
}

/* ─── Empty state ─── */
.empty-state {
  grid-column: 1/-1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-20);
  color: var(--txt-muted);
  text-align: center;
}
.empty-state [data-lucide] { width: 48px; height: 48px; }

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-surface-1); }
::-webkit-scrollbar-thumb { background: var(--bg-surface-3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--txt-muted); }

/* ─── Focus ring ─── */
:focus-visible {
  outline: 2px solid var(--clr-cyan);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ─── Selection ─── */
::selection {
  background: var(--clr-cyan-glow);
  color: var(--clr-cyan);
}