/* ─── TOKENS ─────────────────────────────────────── */
:root {
  --bg:         #080c18;
  --bg-2:       #0d1120;
  --bg-3:       #131829;
  --border:     #1e2540;
  --border-2:   #2a3050;
  --text:       #e0e6ff;
  --text-muted: #5a6480;
  --text-dim:   #8a9abf;
  --accent:     #00e5a0;
  --accent-2:   #00b8ff;
  --danger:     #ff4d6a;
  --warn:       #ffc850;
  --font-display: 'Syne', sans-serif;
  --font-mono:    'Space Mono', monospace;
  --r:   6px;
  --r-lg: 12px;
  --t: 0.18s ease;
}

/* ─── RESET ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; -webkit-font-smoothing: antialiased; }
body { background: var(--bg); color: var(--text); font-family: var(--font-mono); min-height: 100vh; display: flex; flex-direction: column; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ─── NAV ────────────────────────────────────────── */
.nav { display: flex; align-items: center; justify-content: space-between; padding: 0 2rem; height: 56px; border-bottom: 1px solid var(--border); background: var(--bg-2); position: sticky; top: 0; z-index: 100; }
.nav-brand { font-family: var(--font-display); font-weight: 800; font-size: 1.1rem; letter-spacing: 0.12em; color: var(--accent); display: flex; align-items: center; gap: 0.5rem; }
.nav-right { display: flex; align-items: center; gap: 1rem; }
.nav-user { font-size: 0.78rem; color: var(--text-dim); }
.nav-link { font-size: 0.72rem; color: var(--text-muted); letter-spacing: 0.05em; }
.nav-link:hover { color: var(--accent); }

/* ─── FLASH ──────────────────────────────────────── */
.flash-container { padding: 0 2rem; }
.flash { margin: 0.75rem auto; max-width: 1100px; padding: 0.65rem 1rem; border-radius: var(--r); font-size: 0.85rem; border-left: 3px solid; animation: fadeIn 0.2s ease; }
.flash--success { background: rgba(0,229,160,0.08); border-color: var(--accent);  color: var(--accent); }
.flash--warning { background: rgba(255,200,80,0.08); border-color: var(--warn);   color: var(--warn); }
.flash--error   { background: rgba(255,77,106,0.08); border-color: var(--danger); color: var(--danger); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

/* ─── MAIN ───────────────────────────────────────── */
.main { flex: 1; padding: 2rem; max-width: 1200px; margin: 0 auto; width: 100%; }

/* ─── BUTTONS ────────────────────────────────────── */
.btn { display: inline-block; padding: 0.55rem 1.2rem; border-radius: var(--r); font-family: var(--font-mono); font-size: 0.8rem; cursor: pointer; border: 1px solid; transition: var(--t); letter-spacing: 0.05em; background: none; }
.btn--primary { background: var(--accent); color: #040810; border-color: var(--accent); font-weight: 700; }
.btn--primary:hover { background: #00ffa8; border-color: #00ffa8; }
.btn--primary:disabled { opacity: 0.5; cursor: wait; }
.btn--secondary { color: var(--text-dim); border-color: var(--border-2); }
.btn--secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn--secondary:disabled { opacity: 0.5; cursor: wait; }
.btn--danger { color: var(--danger); border-color: rgba(255,77,106,0.3); }
.btn--danger:hover { background: rgba(255,77,106,0.08); }
.btn--ghost { color: var(--text-muted); border-color: var(--border); }
.btn--ghost:hover { border-color: var(--text-muted); color: var(--text-dim); }
.btn--full { width: 100%; text-align: center; }
.btn--sm { padding: 0.35rem 0.8rem; font-size: 0.72rem; }

/* ─── AUTH ───────────────────────────────────────── */
.auth-wrap { display: flex; align-items: center; justify-content: center; min-height: 60vh; }
.auth-card { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 2.5rem 2rem; width: 100%; max-width: 400px; display: flex; flex-direction: column; gap: 1rem; }
.auth-brand { font-family: var(--font-display); font-size: 0.9rem; font-weight: 800; letter-spacing: 0.15em; color: var(--accent); text-align: center; }
.auth-title { font-family: var(--font-display); font-size: 1.6rem; font-weight: 800; text-align: center; }
.auth-sub { font-size: 0.78rem; color: var(--text-muted); text-align: center; }
.link { color: var(--accent); }
.link:hover { text-decoration: underline; }
.form-group { display: flex; flex-direction: column; gap: 0.35rem; }
.form-label { font-size: 0.7rem; color: var(--text-dim); letter-spacing: 0.08em; }
.form-hint { color: var(--text-muted); font-size: 0.65rem; }
.form-input { background: var(--bg-3); border: 1px solid var(--border-2); border-radius: var(--r); color: var(--text); font-family: var(--font-mono); font-size: 0.85rem; padding: 0.6rem 0.9rem; outline: none; transition: var(--t); width: 100%; }
.form-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,229,160,0.08); }
.form-input::placeholder { color: var(--text-muted); }

/* ─── DASHBOARD ──────────────────────────────────── */
.dashboard-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 1.75rem; }
.page-title { font-family: var(--font-display); font-size: 2rem; font-weight: 800; letter-spacing: -0.01em; }
.page-sub { color: var(--text-muted); font-size: 0.78rem; margin-top: 0.2rem; }

.add-panel { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 1.25rem 1.5rem; margin-bottom: 2rem; }
.add-panel__label { font-size: 0.7rem; color: var(--accent); letter-spacing: 0.12em; margin-bottom: 0.75rem; }
.add-form { display: flex; gap: 0.75rem; }
.url-input { flex: 1; background: var(--bg-3); border: 1px solid var(--border-2); border-radius: var(--r); color: var(--text); font-family: var(--font-mono); font-size: 0.82rem; padding: 0.6rem 0.9rem; outline: none; transition: var(--t); }
.url-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,229,160,0.08); }
.url-input::placeholder { color: var(--text-muted); }
.currency-select { background: var(--bg-3); border: 1px solid var(--border-2); border-radius: var(--r); color: var(--text); font-family: var(--font-mono); font-size: 0.78rem; padding: 0.6rem 0.5rem; outline: none; cursor: pointer; }

.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }
.product-card { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; display: flex; flex-direction: column; transition: border-color var(--t), transform var(--t); }
.product-card:hover { border-color: var(--border-2); transform: translateY(-2px); }
.product-card__img-wrap { height: 180px; background: var(--bg-3); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.product-card__img { width: 100%; height: 100%; object-fit: contain; padding: 1rem; }
.product-card__img-placeholder { font-size: 3rem; color: var(--border-2); }
.product-card__body { padding: 1rem 1.1rem 1.1rem; flex: 1; display: flex; flex-direction: column; gap: 0.75rem; }
.product-card__name { font-family: var(--font-display); font-size: 0.9rem; font-weight: 600; line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.product-card__prices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
.price-stat { display: flex; flex-direction: column; gap: 0.15rem; }
.price-stat__label { font-size: 0.6rem; color: var(--text-muted); letter-spacing: 0.1em; }
.price-stat__val { font-size: 0.85rem; font-weight: 700; }
.price-stat__val--current { color: var(--text); }
.price-stat__val--low  { color: var(--accent); }
.price-stat__val--high { color: var(--danger); }
.product-card__meta { display: flex; justify-content: space-between; font-size: 0.7rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 0.6rem; }

.badge { display: inline-block; padding: 0.1rem 0.45rem; border-radius: 99px; font-size: 0.6rem; letter-spacing: 0.08em; font-weight: 700; margin-left: 0.35rem; vertical-align: middle; }
.badge--low { background: rgba(0,229,160,0.12); color: var(--accent); border: 1px solid rgba(0,229,160,0.3); }

.loading-state { color: var(--text-muted); font-size: 0.85rem; text-align: center; padding: 3rem; }
.empty-state { text-align: center; padding: 5rem 2rem; color: var(--text-muted); }
.empty-state__icon { font-size: 3rem; margin-bottom: 1rem; color: var(--border-2); }
.empty-state__title { font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 0.5rem; color: var(--text-dim); }
.empty-state__sub { font-size: 0.82rem; }

/* ─── PRODUCT DETAIL ─────────────────────────────── */
.breadcrumb { display: flex; align-items: center; gap: 0.5rem; font-size: 0.75rem; color: var(--text-muted); margin-bottom: 1.5rem; }
.breadcrumb__link { color: var(--accent); }
.breadcrumb__link:hover { text-decoration: underline; }
.breadcrumb__sep { color: var(--border-2); }

.product-layout { display: grid; grid-template-columns: 300px 1fr; gap: 1.5rem; align-items: start; }

.summary-panel { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 1.25rem; display: flex; flex-direction: column; gap: 1rem; position: sticky; top: 72px; }
.summary-img-wrap { border-radius: var(--r); overflow: hidden; background: var(--bg-3); max-height: 200px; display: flex; align-items: center; justify-content: center; }
.summary-img { width: 100%; max-height: 200px; object-fit: contain; padding: 0.75rem; }
.summary-name { font-family: var(--font-display); font-size: 1rem; font-weight: 600; line-height: 1.4; }
.summary-url { font-size: 0.72rem; color: var(--accent-2); }
.summary-url:hover { text-decoration: underline; }
.summary-actions { display: flex; flex-direction: column; gap: 0.4rem; }
.summary-meta { font-size: 0.68rem; color: var(--text-muted); line-height: 1.7; }

.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; }
.stat-block { background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--r); padding: 0.6rem 0.7rem; }
.stat-block__label { font-size: 0.58rem; color: var(--text-muted); letter-spacing: 0.1em; margin-bottom: 0.2rem; }
.stat-block__val { font-size: 0.95rem; font-weight: 700; }
.stat-block--current .stat-block__val { color: var(--text); }
.stat-block--low     .stat-block__val { color: var(--accent); }
.stat-block--high    .stat-block__val { color: var(--danger); }

.prediction-panel { background: rgba(0,229,160,0.05); border: 1px solid rgba(0,229,160,0.2); border-radius: var(--r); padding: 0.9rem 1rem; display: flex; flex-direction: column; gap: 0.6rem; }
.prediction-panel__title { font-size: 0.65rem; letter-spacing: 0.12em; color: var(--accent); }
.confidence-meter { height: 4px; background: var(--border-2); border-radius: 99px; overflow: hidden; }
.confidence-meter__bar { height: 100%; border-radius: 99px; transition: width 1s ease; }
.confidence-meter__bar--high { background: linear-gradient(90deg, var(--accent), #00b8ff); }
.confidence-meter__bar--mid  { background: linear-gradient(90deg, var(--warn), var(--accent)); }
.confidence-meter__bar--low  { background: var(--warn); }
.confidence-label { display: flex; justify-content: space-between; font-size: 0.7rem; color: var(--text-muted); }
.confidence-pct { color: var(--accent); font-weight: 700; }
.prediction-est { font-size: 0.82rem; color: var(--text-dim); line-height: 1.5; }
.prediction-est strong { color: var(--text); font-size: 1rem; }
.prediction-saving { color: var(--accent); font-size: 0.75rem; }
.prediction-gap { font-size: 0.75rem; color: var(--text-muted); }
.prediction-gap strong { color: var(--text-dim); }
.reasoning-list { list-style: none; display: flex; flex-direction: column; gap: 0.25rem; }
.reasoning-list li { font-size: 0.7rem; color: var(--text-muted); padding-left: 0.9rem; position: relative; }
.reasoning-list li::before { content: '›'; position: absolute; left: 0; color: var(--accent); }

.chart-panel { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; display: flex; flex-direction: column; }
.chart-header { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.25rem; border-bottom: 1px solid var(--border); }
.chart-title { font-size: 0.72rem; letter-spacing: 0.12em; color: var(--text-dim); }
.chart-readings { font-size: 0.7rem; color: var(--text-muted); }
.chart-wrap { padding: 1.25rem; height: 340px; }
.chart-placeholder { padding: 4rem 2rem; text-align: center; color: var(--text-muted); font-size: 0.85rem; }
.chart-placeholder__sub { margin-top: 0.5rem; font-size: 0.75rem; }

.history-wrap { border-top: 1px solid var(--border); max-height: 320px; overflow-y: auto; }
.history-table { width: 100%; border-collapse: collapse; font-size: 0.78rem; }
.history-table thead { position: sticky; top: 0; }
.history-table th { background: var(--bg-3); color: var(--text-muted); font-size: 0.62rem; letter-spacing: 0.1em; padding: 0.6rem 1.25rem; text-align: left; font-weight: 400; border-bottom: 1px solid var(--border); }
.history-table td { padding: 0.55rem 1.25rem; border-bottom: 1px solid var(--border); color: var(--text-dim); }
.history-table tbody tr:hover td { background: var(--bg-3); }
.history-table tbody tr:last-child td { border-bottom: none; }
.mono { font-family: var(--font-mono); }
.price-cell { color: var(--text); }
.change--down { color: var(--accent); }
.change--up   { color: var(--danger); }

/* ─── FOOTER ─────────────────────────────────────── */
.footer { border-top: 1px solid var(--border); padding: 1rem 2rem; display: flex; justify-content: space-between; font-size: 0.68rem; color: var(--text-muted); letter-spacing: 0.06em; }
.footer-link { color: var(--accent-2); }

/* ─── RESPONSIVE ─────────────────────────────────── */
@media (max-width: 860px) { .product-layout { grid-template-columns: 1fr; } .summary-panel { position: static; } .add-form { flex-direction: column; } }
@media (max-width: 540px)  { .main { padding: 1rem; } .product-grid { grid-template-columns: 1fr; } }

/* ─── SCROLLBAR ──────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }