/* ═══════════════════════════════════════════════════════════════
   RECIPE COST CALCULATOR — style.css
   Design: Dark-mode glassmorphism · Violet/Cyan gradient accents
═══════════════════════════════════════════════════════════════ */

/* ─── Google Font already linked in HTML ─── */

/* ══════════════════════════════
   1. DESIGN TOKENS
══════════════════════════════ */
:root {
  /* Colors */
  --clr-bg:           #0c0c14;
  --clr-bg-2:         #11111e;
  --clr-surface:      rgba(255, 255, 255, 0.04);
  --clr-surface-hov:  rgba(255, 255, 255, 0.07);
  --clr-border:       rgba(255, 255, 255, 0.08);
  --clr-border-hov:   rgba(255, 255, 255, 0.18);

  /* Accent gradient */
  --clr-violet:       #7c3aed;
  --clr-violet-light: #a855f7;
  --clr-cyan:         #06b6d4;
  --clr-cyan-light:   #22d3ee;
  --grad-accent:      linear-gradient(135deg, var(--clr-violet), var(--clr-cyan));
  --grad-accent-rev:  linear-gradient(135deg, var(--clr-cyan), var(--clr-violet));

  /* Status */
  --clr-success:      #10b981;
  --clr-danger:       #f43f5e;
  --clr-danger-dim:   rgba(244, 63, 94, 0.15);
  --clr-warn:         #f59e0b;

  /* Text */
  --clr-text:         #e2e8f0;
  --clr-text-muted:   #64748b;
  --clr-text-dim:     #94a3b8;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;

  /* Shadows */
  --shadow-glow:  0 0 30px rgba(124, 58, 237, 0.15);
  --shadow-card:  0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-input: 0 0 0 2px rgba(124, 58, 237, 0.4);

  /* Typography */
  --font-base: 'Inter', system-ui, -apple-system, sans-serif;
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-md:   1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  2rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-md:   250ms ease;
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ══════════════════════════════
   2. RESET & BASE
══════════════════════════════ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  font-size: var(--text-md);
  color: var(--clr-text);
  background-color: var(--clr-bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(124, 58, 237, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(6, 182, 212, 0.10) 0%, transparent 60%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ══════════════════════════════
   3. HEADER
══════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 12, 20, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--clr-border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.brand-icon {
  font-size: 2rem;
  line-height: 1;
  filter: drop-shadow(0 0 8px rgba(124,58,237,0.6));
}

.brand-name {
  font-size: var(--text-xl);
  font-weight: 800;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.brand-tagline {
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
  font-weight: 400;
  margin-top: 2px;
}

/* Currency select */
.currency-select {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  color: var(--clr-text);
  font-family: var(--font-base);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%2364748b'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 2rem;
}

.currency-select:hover  { border-color: var(--clr-border-hov); }
.currency-select:focus  { outline: none; box-shadow: var(--shadow-input); border-color: var(--clr-violet); }

/* ══════════════════════════════
   4. AD WRAPPERS
══════════════════════════════ */
.ad-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-xl);
  min-height: 90px; /* reserves space to prevent CLS */
}

.ad-wrapper--top  { padding-top: var(--space-lg); }
.ad-wrapper--bottom { padding-bottom: var(--space-lg); }

/* ══════════════════════════════
   5. MAIN LAYOUT
══════════════════════════════ */
.main-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl);
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-xl);
  align-items: start;
}

@media (max-width: 768px) {
  .main-layout {
    grid-template-columns: 1fr;
    padding: var(--space-md);
  }
  .header-inner { padding: var(--space-md); }
  .ad-wrapper    { padding: var(--space-md); }
}

/* ══════════════════════════════
   6. PANELS (CARDS)
══════════════════════════════ */
.panel {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-md), box-shadow var(--transition-md);
}

.panel:hover {
  border-color: var(--clr-border-hov);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  gap: var(--space-sm);
}

.panel__title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.02em;
}

.content-area {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ══════════════════════════════
   7. RECIPE LIST (SIDEBAR)
══════════════════════════════ */
.recipe-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-height: 420px;
  overflow-y: auto;
  padding-right: 2px;
}

.recipe-list::-webkit-scrollbar       { width: 4px; }
.recipe-list::-webkit-scrollbar-track { background: transparent; }
.recipe-list::-webkit-scrollbar-thumb { background: var(--clr-border-hov); border-radius: 99px; }

.recipe-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  color: var(--clr-text-dim);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  gap: var(--space-sm);
}

.recipe-item:hover {
  background: var(--clr-surface-hov);
  color: var(--clr-text);
}

.recipe-item.is-active {
  background: rgba(124, 58, 237, 0.15);
  border-color: rgba(124, 58, 237, 0.4);
  color: var(--clr-violet-light);
}

.recipe-item__name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.recipe-item__del {
  background: none;
  border: none;
  color: var(--clr-text-muted);
  cursor: pointer;
  font-size: var(--text-sm);
  padding: 2px 4px;
  border-radius: 4px;
  opacity: 0;
  transition: opacity var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}

.recipe-item:hover .recipe-item__del  { opacity: 1; }
.recipe-item__del:hover               { color: var(--clr-danger); background: var(--clr-danger-dim); }

/* ══════════════════════════════
   8. RECIPE TITLE BAR
══════════════════════════════ */
.recipe-titlebar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.recipe-title-group { flex: 1; }

.recipe-name-input {
  width: 100%;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  color: var(--clr-text);
  font-family: var(--font-base);
  font-size: var(--text-2xl);
  font-weight: 700;
  padding: var(--space-sm) var(--space-md);
  letter-spacing: -0.03em;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.recipe-name-input::placeholder { color: var(--clr-text-muted); font-weight: 400; }
.recipe-name-input:focus        { outline: none; border-color: var(--clr-violet); box-shadow: var(--shadow-input); }

/* ══════════════════════════════
   9. INGREDIENTS TABLE
══════════════════════════════ */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
}

.ingredients-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.ingredients-table thead {
  background: rgba(255,255,255,0.03);
}

.ingredients-table th {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-text-muted);
  white-space: nowrap;
  border-bottom: 1px solid var(--clr-border);
}

.ingredients-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: middle;
}

.ingredients-table tbody tr {
  transition: background var(--transition-fast);
  animation: rowIn 0.3s var(--transition-slow) both;
}

@keyframes rowIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.ingredients-table tbody tr:hover  { background: var(--clr-surface-hov); }
.ingredients-table tbody tr:last-child td { border-bottom: none; }

.col-action { width: 40px; text-align: center; }

/* Table inputs */
.tbl-input, .tbl-select {
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--clr-text);
  font-family: var(--font-base);
  font-size: var(--text-sm);
  padding: 4px 8px;
  width: 100%;
  transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.tbl-input:focus, .tbl-select:focus {
  outline: none;
  background: var(--clr-surface);
  border-color: var(--clr-violet);
  box-shadow: 0 0 0 2px rgba(124,58,237,0.25);
}

.tbl-input[type="number"] { text-align: right; }
.tbl-input.is-name        { min-width: 120px; }
.tbl-input.is-qty         { max-width: 80px; }
.tbl-input.is-cost        { max-width: 100px; }

.tbl-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='5'%3E%3Cpath d='M0 0l4 5 4-5z' fill='%2364748b'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
  padding-right: 1.4rem;
  cursor: pointer;
  max-width: 90px;
}

.tbl-select option { background: #1e1e2e; color: var(--clr-text); }

.line-cost {
  font-weight: 600;
  color: var(--clr-cyan-light);
  white-space: nowrap;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Row delete button */
.btn-row-del {
  background: none;
  border: none;
  color: var(--clr-text-muted);
  cursor: pointer;
  font-size: var(--text-md);
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-row-del:hover { color: var(--clr-danger); background: var(--clr-danger-dim); }

/* ══════════════════════════════
   10. SUMMARY PANEL
══════════════════════════════ */
.panel--summary {
  background: rgba(124,58,237,0.06);
  border-color: rgba(124,58,237,0.2);
}

.panel--summary:hover {
  border-color: rgba(124,58,237,0.4);
  box-shadow: var(--shadow-card), 0 0 40px rgba(124,58,237,0.2);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

@media (max-width: 560px) {
  .summary-grid { grid-template-columns: 1fr; }
}

.summary-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  text-align: center;
  transition: border-color var(--transition-md);
}

.summary-card:hover { border-color: var(--clr-border-hov); }

.summary-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--clr-text-muted);
}

.summary-value {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-variant-numeric: tabular-nums;
  transition: transform var(--transition-fast);
}

.summary-value.is-updating {
  animation: valuePop 0.3s ease;
}

@keyframes valuePop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.06); }
  100% { transform: scale(1); }
}

/* Servings control */
.servings-control {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.servings-btn {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text);
  font-size: var(--text-lg);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  line-height: 1;
}

.servings-btn:hover  { background: var(--clr-surface-hov); border-color: var(--clr-violet); transform: scale(1.1); }
.servings-btn:active { transform: scale(0.95); }

.servings-input {
  width: 60px;
  text-align: center;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  color: var(--clr-text);
  font-family: var(--font-base);
  font-size: var(--text-lg);
  font-weight: 700;
  padding: 4px 8px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.servings-input:focus { outline: none; border-color: var(--clr-violet); box-shadow: var(--shadow-input); }
.servings-input::-webkit-inner-spin-button,
.servings-input::-webkit-outer-spin-button { -webkit-appearance: none; }

.summary-actions {
  display: flex;
  justify-content: flex-end;
  padding-top: var(--space-md);
  border-top: 1px solid var(--clr-border);
}

/* ══════════════════════════════
   11. BUTTONS
══════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-base);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  padding: var(--space-sm) var(--space-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}

.btn:active { transform: scale(0.97); }

.btn--sm { padding: 6px 12px; font-size: var(--text-xs); border-radius: var(--radius-sm); }

.btn--primary {
  background: var(--grad-accent);
  color: #fff;
  border: none;
  box-shadow: 0 2px 12px rgba(124,58,237,0.35);
}
.btn--primary:hover {
  box-shadow: 0 4px 20px rgba(124,58,237,0.55);
  transform: translateY(-1px);
}

.btn--accent {
  background: rgba(6, 182, 212, 0.15);
  color: var(--clr-cyan-light);
  border-color: rgba(6, 182, 212, 0.3);
}
.btn--accent:hover {
  background: rgba(6, 182, 212, 0.25);
  border-color: var(--clr-cyan);
  box-shadow: 0 2px 12px rgba(6,182,212,0.2);
}

.btn--danger {
  background: var(--clr-danger-dim);
  color: var(--clr-danger);
  border-color: rgba(244,63,94,0.3);
}
.btn--danger:hover {
  background: rgba(244,63,94,0.25);
  border-color: var(--clr-danger);
}

.btn--outline {
  background: transparent;
  color: var(--clr-text-dim);
  border-color: var(--clr-border);
}
.btn--outline:hover {
  background: var(--clr-surface-hov);
  border-color: var(--clr-border-hov);
  color: var(--clr-text);
}

.btn-icon { font-size: 1em; line-height: 1; }

/* ══════════════════════════════
   12. EMPTY STATE
══════════════════════════════ */
.empty-state {
  text-align: center;
  color: var(--clr-text-muted);
  font-size: var(--text-sm);
  padding: var(--space-xl) var(--space-md);
  font-style: italic;
}

/* ══════════════════════════════
   13. TOAST NOTIFICATION
══════════════════════════════ */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--clr-success);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-sm) var(--space-xl);
  border-radius: 99px;
  box-shadow: 0 4px 20px rgba(16,185,129,0.4);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.35s var(--transition-slow), opacity 0.35s ease;
  z-index: 1000;
  white-space: nowrap;
}

.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ══════════════════════════════
   14. FOOTER
══════════════════════════════ */
.site-footer {
  text-align: center;
  padding: var(--space-xl);
  color: var(--clr-text-muted);
  font-size: var(--text-xs);
  border-top: 1px solid var(--clr-border);
  margin-top: var(--space-xl);
}