/* =========================================
   Practical 7 — Premium Light Theme
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;600&family=DM+Mono:wght@400;500&family=Fraunces:wght@700;900&display=swap');

:root {
  --bg: #f4f3ee;
  --surface: #ffffff;
  --surface2: #f9f8f5;
  --border: #e8e5dd;
  --text: #1a1917;
  --text-muted: #7a7772;
  --accent: #e85d26;
  --accent2: #2563eb;
  --green: #16a34a;
  --red: #dc2626;
  --shadow: 0 2px 16px rgba(0,0,0,0.07), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);
  --radius: 16px;
  --radius-sm: 8px;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --font-display: 'Fraunces', serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ---- HEADER ---- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 40px 24px 36px;
  text-align: center;
}
.header-inner { max-width: 700px; margin: 0 auto; }

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 100px;
  padding: 3px 12px;
  margin-bottom: 14px;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}
h1 .accent { color: var(--accent); }

.subtitle {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ---- LAYOUT ---- */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 20px 60px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* ---- CARD ---- */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 36px 36px 32px;
  box-shadow: var(--shadow);
  position: relative;
  transition: box-shadow 0.2s ease;
  animation: fadeUp 0.4s ease both;
}
.card:nth-child(2) { animation-delay: 0.1s; }
.card:nth-child(3) { animation-delay: 0.2s; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card-label {
  position: absolute;
  top: 20px; right: 24px;
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 900;
  color: var(--border);
  line-height: 1;
  user-select: none;
}

.card h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--accent);
}

/* ---- TABLE ---- */
.data-table-wrap {
  overflow-x: auto;
  margin-bottom: 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.data-table thead th {
  background: var(--surface2);
  padding: 10px 16px;
  text-align: left;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  font-size: 0.78rem;
  text-transform: uppercase;
}
.data-table tbody tr { border-top: 1px solid var(--border); }
.data-table tbody tr:hover { background: var(--surface2); }
.data-table tbody td { padding: 9px 16px; }

/* ---- PARAMS ---- */
.params-row {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.params-row label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.params-row input {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface2);
  color: var(--text);
  width: 130px;
  transition: border-color 0.15s;
  outline: none;
}
.params-row input:focus { border-color: var(--accent2); }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
  letter-spacing: 0.01em;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(232,93,38,0.25);
}
.btn-primary:hover:not(:disabled) {
  box-shadow: 0 4px 16px rgba(232,93,38,0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent2);
  color: var(--accent2);
  box-shadow: var(--shadow-hover);
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

/* ---- PROGRESS ---- */
.progress-wrap {
  margin: 18px 0 0;
  display: flex;
  align-items: center;
  gap: 14px;
}
.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--surface2);
  border-radius: 100px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  border-radius: 100px;
  transition: width 0.1s linear;
}
#progress-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ---- LOSS CHART ---- */
.loss-wrap {
  margin-top: 24px;
  background: var(--surface2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  padding: 16px;
}

/* ---- STATUS ---- */
.status {
  margin-top: 14px;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  border-left: 3px solid;
}
.status.success { background: #f0fdf4; border-color: var(--green); color: #166534; }
.status.error   { background: #fef2f2; border-color: var(--red);   color: #991b1b; }
.status.info    { background: #eff6ff; border-color: var(--accent2); color: #1e40af; }

/* ---- INPUT ROW ---- */
.input-row {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.input-row input {
  flex: 1;
  min-width: 160px;
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 11px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface2);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
.input-row input:focus { border-color: var(--accent2); }

/* ---- PREDICTION RESULTS ---- */
.pred-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  animation: fadeUp 0.3s ease;
}
.pred-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.pred-card.diff { border-color: var(--accent2); background: #eff6ff; }

.pred-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}
.pred-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
}
.pred-card.diff .pred-value { color: var(--accent2); }

/* ---- FOOTER ---- */
.site-footer {
  text-align: center;
  padding: 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 560px) {
  .card { padding: 24px 18px; }
  .card-label { font-size: 2rem; }
}