/* warna dan variabel utama */
:root {
  --blue-deep:    #0f172a;
  --blue-dark:    #1e293b;
  --blue-mid:     #dbeafe;
  --blue-accent:  #3b82f6;
  --blue-light:   #60a5fa;

  --pink:         #ec4899;
  --pink-soft:    #fbcfe8;

  --cyan:         #38bdf8;
  --white:        #ffffff;
  --white-dim:    #64748b;

  --green:        #22c55e;
  --red:          #ef4444;
  --yellow:       #facc15;

  --card-bg:      #ffffff;
  --card-radius:  14px;
  --font-display: 'Syne', sans-serif;
  --font-mono:    'Space Mono', monospace;
}

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

body {
  background: linear-gradient(135deg, #fdf2f8 0%, #eff6ff 50%, #f0f9ff 100%);
  color: var(--blue-deep);
  font-family: var(--font-display);
  min-height: 100vh;
}

/* header */
.header {
  background: linear-gradient(135deg, #3b82f6, #ec4899);
  padding: 0 40px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1400px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon { font-size: 32px; }

.brand-text h1 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 3px;
  color: white;
}

.brand-text span {
  font-size: 11px;
  color: #fce7f3;
}

.header-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.refresh-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: white;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: white;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.last-update {
  font-size: 11px;
  color: #fbcfe8;
}

/* konten utama */
.main {
  max-width: 1400px;
  margin: auto;
  padding: 40px;
}

.section-title {
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: 3px;
  color: var(--blue-accent);
  margin-bottom: 20px;
}

/* kartu sensor */
.cards-section {
  margin-bottom: 40px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.card {
  background: white;
  border: 1px solid var(--blue-mid);
  border-radius: var(--card-radius);
  padding: 25px;
  text-align: center;
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(236, 72, 153, 0.15);
}

.card::before {
  content: '';
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-accent), var(--pink));
  margin: -25px -25px 15px;
  border-radius: 10px 10px 0 0;
}

.card-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.card-label {
  font-size: 11px;
  color: var(--white-dim);
  margin-bottom: 10px;
}

.card-value {
  font-size: 40px;
  font-weight: bold;
  background: linear-gradient(90deg, var(--blue-accent), var(--pink));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.card-unit {
  font-size: 12px;
  color: var(--white-dim);
}

.card-status {
  margin-top: 10px;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 11px;
}

.card-status.normal {
  background: rgba(34, 197, 94, 0.1);
  color: var(--green);
}

.card-status.bahaya {
  background: rgba(239, 68, 68, 0.1);
  color: var(--red);
}

/* grafik */
.charts-section {
  margin-bottom: 40px;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.chart-card {
  background: white;
  border: 1px solid var(--blue-mid);
  border-radius: var(--card-radius);
  padding: 20px;
  /* FIX: overflow hidden agar canvas tidak keluar dari card */
  overflow: hidden;
}

.chart-card h3 {
  font-size: 12px;
  color: var(--white-dim);
  margin-bottom: 10px;
}

/* FIX: canvas responsif mengikuti lebar card */
.chart-card canvas {
  width: 100% !important;
  height: 220px !important;
}

/* log */
.log-section {
  margin-bottom: 40px;
}

.log-box {
  background: white;
  border: 1px solid var(--blue-mid);
  border-radius: var(--card-radius);
  padding: 15px;
  max-height: 150px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 12px;
}

.log-entry { margin-bottom: 2px; }
.log-entry.success { color: var(--green); }
.log-entry.error   { color: var(--red); }
.log-entry.warning { color: var(--yellow); }
.log-entry.info    { color: var(--white-dim); }

/* footer */
.footer {
  text-align: center;
  padding: 20px;
  font-size: 11px;
  color: var(--white-dim);
}

/* section prediksi pH */
.prediksi-section {
  margin-bottom: 40px;
}

.prediksi-model-info {
  display: flex;
  align-items: center;
  gap: 20px;
  background: rgba(59, 130, 246, 0.06);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 8px;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--white-dim);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.prediksi-r2 strong,
.prediksi-jumlah strong {
  color: var(--blue-accent);
}

.prediksi-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.prediksi-card {
  background: var(--card-bg);
  border: 1px solid var(--blue-mid);
  border-radius: var(--card-radius);
  padding: 20px;
  text-align: center;
  transition: border-color 0.3s;
}

.prediksi-card.pred-normal {
  border-color: var(--green);
  box-shadow: 0 0 10px rgba(34, 197, 94, 0.15);
}

.prediksi-card.pred-bahaya {
  border-color: var(--red);
  box-shadow: 0 0 10px rgba(239, 68, 68, 0.2);
}

.prediksi-langkah {
  font-size: 11px;
  color: var(--white-dim);
  font-family: var(--font-mono);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

/* FIX #3: ganti dari var(--white) ke warna gelap agar terbaca di background putih */
.prediksi-nilai {
  font-size: 36px;
  font-weight: 800;
  font-family: var(--font-display);
  color: var(--blue-deep);
  line-height: 1;
}

.prediksi-unit {
  font-size: 12px;
  color: var(--white-dim);
  margin: 4px 0 10px;
}

.prediksi-status {
  font-size: 12px;
  font-family: var(--font-mono);
  padding: 4px 10px;
  border-radius: 20px;
  display: inline-block;
}

.prediksi-status.normal {
  color: var(--green);
  background: rgba(34, 197, 94, 0.1);
}

.prediksi-status.bahaya {
  color: var(--red);
  background: rgba(239, 68, 68, 0.1);
}

.prediksi-chart-wrapper {
  width: 100%;
}

/* tampilan hp */
@media (max-width: 900px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .charts-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .main {
    padding: 20px;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .prediksi-cards {
    grid-template-columns: 1fr;
  }
  .prediksi-model-info {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
  .header {
    padding: 0 20px;
  }
}