/* Assignment 1 — Fruit Classifier */
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #22263a;
  --border: rgba(255,255,255,0.08);
  --text: #f0f2f8;
  --text2: #8892aa;
  --apple: #ff6b6b;
  --banana: #ffd93d;
  --orange: #ff9f43;
  --blue: #74b9ff;
  --green: #55efc4;
  --radius: 14px;
  --font: 'Outfit', sans-serif;
  --mono: 'JetBrains Mono', monospace;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; }

header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-icon { font-size: 28px; }
.brand h1 { font-size: 20px; font-weight: 800; }
.brand p { font-size: 12px; color: var(--text2); }
.status-pill {
  background: var(--surface2); border: 1px solid var(--border);
  padding: 6px 14px; border-radius: 20px; font-size: 12px;
}
.status-pill.ready { border-color: var(--green); color: var(--green); }
.status-pill.training { border-color: var(--blue); color: var(--blue); }

.page {
  display: grid; grid-template-columns: 300px 1fr 280px;
  gap: 0; min-height: calc(100vh - 67px);
}

.left-col, .center-col, .right-col {
  padding: 20px 16px; overflow-y: auto;
}
.center-col { background: var(--surface); border-left: 1px solid var(--border); border-right: 1px solid var(--border); }

.section-title {
  font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px;
  color: var(--text2); margin-bottom: 14px;
}

/* CLASS PANELS */
.class-panels { display: flex; flex-direction: column; gap: 12px; margin-bottom: 16px; }
.class-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.class-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.class-label {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 15px;
}
.class-emoji { font-size: 20px; }
.class-count-badge {
  background: rgba(255,255,255,0.1);
  padding: 2px 8px; border-radius: 10px; font-size: 11px;
}
.class-upload-area {
  padding: 12px;
  display: flex; gap: 8px; align-items: center;
}
.class-file-label {
  background: rgba(255,255,255,0.07);
  border: 1px dashed var(--border);
  padding: 7px 12px; border-radius: 8px;
  font-size: 12px; cursor: pointer;
  transition: all 0.2s; white-space: nowrap;
}
.class-file-label:hover { background: rgba(255,255,255,0.12); }
.class-thumb-row {
  display: flex; gap: 5px;
  overflow-x: auto; padding-bottom: 2px;
}
.class-thumb {
  width: 48px; height: 48px;
  border-radius: 6px; object-fit: cover; flex-shrink: 0;
}

/* SUMMARY CARD */
.summary-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.summary-card h3 { font-size: 13px; margin-bottom: 12px; color: var(--text2); }
.summary-grid { display: flex; flex-direction: column; gap: 8px; }
.summary-row {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px;
}
.summary-bar-wrap { flex: 1; margin: 0 10px; height: 5px; background: rgba(255,255,255,0.1); border-radius: 20px; }
.summary-bar { height: 100%; border-radius: 20px; }

/* TRAINING CARD */
.train-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px; margin-bottom: 14px;
}
.train-params { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-bottom: 14px; }
.param label { display: block; font-size: 11px; color: var(--text2); margin-bottom: 4px; }
.param input {
  width: 100%; background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: 7px; padding: 7px 10px;
  font-family: var(--mono); font-size: 14px;
  color: var(--text);
}
.param input:focus { outline: none; border-color: var(--blue); }

.btn-train {
  width: 100%; padding: 12px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff; border: none; border-radius: 10px;
  font-family: var(--font); font-size: 15px; font-weight: 700;
  cursor: pointer; transition: all 0.25s;
  margin-bottom: 8px;
}
.btn-train:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(102,126,234,0.4); }
.btn-train:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-secondary {
  width: 100%; padding: 9px;
  background: transparent; border: 1px solid var(--border);
  color: var(--text2); border-radius: 8px;
  font-family: var(--font); font-size: 13px;
  cursor: pointer; transition: all 0.2s;
}
.btn-secondary:hover:not(:disabled) { border-color: var(--apple); color: var(--apple); }
.btn-secondary:disabled { opacity: 0.3; cursor: not-allowed; }

.epoch-info { font-size: 12px; color: var(--text2); margin: 12px 0 6px; }
.prog-track { height: 4px; background: rgba(255,255,255,0.1); border-radius: 20px; margin-bottom: 14px; overflow: hidden; }
.prog-fill { height: 100%; background: linear-gradient(90deg, #667eea, #764ba2); border-radius: 20px; width: 0%; transition: width 0.4s; }

.live-metrics { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; margin-bottom: 14px; }
.metric-box { background: rgba(0,0,0,0.3); border-radius: 10px; padding: 12px; text-align: center; }
.metric-val { font-family: var(--mono); font-size: 20px; font-weight: 600; margin-bottom: 4px; }
.metric-lbl { font-size: 10px; color: var(--text2); text-transform: uppercase; }
.train-box .metric-val { color: var(--green); }
.val-box .metric-val { color: var(--blue); }
.loss-box .metric-val { color: var(--apple); }

#acc-chart, #loss-chart {
  width: 100% !important; display: block;
  background: rgba(0,0,0,0.2); border-radius: 8px; border: 1px solid var(--border);
  margin-bottom: 8px;
}

.results-card {
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px;
}
.results-card h3 { margin-bottom: 14px; font-size: 14px; }
.final-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.final-metric {
  background: rgba(0,0,0,0.3); border-radius: 10px; padding: 14px; text-align: center;
}
.final-metric .val { font-family: var(--mono); font-size: 24px; font-weight: 700; }
.final-metric .lbl { font-size: 11px; color: var(--text2); margin-top: 4px; }

/* PREDICTION */
.predict-card { display: flex; flex-direction: column; gap: 10px; }
.pred-upload-area {
  width: 100%; min-height: 180px;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 8px; position: relative; overflow: hidden;
  transition: all 0.2s;
}
.pred-upload-area:hover { border-color: rgba(255,255,255,0.2); }
#pred-img { width: 100%; height: 180px; object-fit: cover; border-radius: var(--radius); }
.pred-empty { text-align: center; color: var(--text2); font-size: 13px; }
.pred-empty span { font-size: 32px; display: block; margin-bottom: 6px; }
.pred-upload-btn {
  background: rgba(255,255,255,0.1); border: 1px solid var(--border);
  padding: 7px 16px; border-radius: 8px; font-size: 12px; cursor: pointer;
  font-family: var(--font); color: var(--text); transition: all 0.2s;
}
.pred-upload-btn:hover { background: rgba(255,255,255,0.15); }

#webcam { width: 100%; border-radius: var(--radius); }
.cam-controls { display: flex; gap: 8px; }
.btn-sm {
  flex: 1; background: rgba(255,255,255,0.08);
  border: 1px solid var(--border); color: var(--text);
  padding: 7px; border-radius: 8px; font-family: var(--font); font-size: 12px;
  cursor: pointer; transition: all 0.2s;
}
.btn-sm:hover:not(:disabled) { background: rgba(255,255,255,0.15); }
.btn-sm:disabled { opacity: 0.3; cursor: not-allowed; }

.btn-predict {
  width: 100%; padding: 12px;
  background: linear-gradient(135deg, var(--apple), #ff9f43);
  color: #fff; border: none; border-radius: 10px;
  font-family: var(--font); font-size: 14px; font-weight: 700;
  cursor: pointer; transition: all 0.2s;
}
.btn-predict:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(255,107,107,0.4); }

.pred-result { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.pred-badge {
  font-size: 20px; font-weight: 800;
  text-align: center; padding: 12px;
  border-radius: 10px; margin-bottom: 12px;
  background: rgba(255,255,255,0.05);
}
.pred-bars { display: flex; flex-direction: column; gap: 7px; }
.pred-bar-row { display: flex; align-items: center; gap: 8px; font-size: 12px; }
.pred-bar-label { width: 64px; color: var(--text2); }
.pred-bar-track { flex: 1; height: 7px; background: rgba(255,255,255,0.1); border-radius: 20px; overflow: hidden; }
.pred-bar-fill { height: 100%; border-radius: 20px; transition: width 0.5s; }
.pred-bar-pct { width: 36px; color: var(--text2); font-family: var(--mono); font-size: 11px; }

#toast-container { position: fixed; bottom: 20px; right: 20px; z-index: 999; display: flex; flex-direction: column; gap: 8px; }
.toast { background: var(--surface2); border: 1px solid var(--border); color: var(--text); padding: 10px 16px; border-radius: 10px; font-size: 13px; animation: toastIn 0.3s ease; }
.toast.success { border-color: var(--green); }
.toast.error { border-color: var(--apple); }
@keyframes toastIn { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:translateY(0); } }