/* =========================
   DESIGN TOKENS
========================= */
:root {
  --bg-main: #0f1115;
  --bg-gradient-top: #1a1d24;
  --bg-gradient-bottom: #0a0c0f;

  --card-bg: #16181d;
  --card-bg-soft: #1b1e26;
  --card-bg-hover: #1f2229;

  --text-main: #f5f5f5;
  --text-muted: #a1a1aa;
  --text-accent: #e5e7eb;

  --gold: #d4af37;
  --gold-soft: rgba(212, 175, 55, 0.18);
  --gold-glow: rgba(212, 175, 55, 0.3);

  --border-soft: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.12);

  --green: #22c55e;
  --red: #ef4444;
  --blue: #3b82f6;

  --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-strong: 0 20px 40px rgba(0, 0, 0, 0.65);
}

/* =========================
   BASE
========================= */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Inter, system-ui, sans-serif;

  display: flex;
  flex-direction: column;
  align-items: center;

  background: radial-gradient(
    ellipse at top,
    var(--bg-gradient-top),
    var(--bg-gradient-bottom)
  );

  color: var(--text-main);
  min-height: 100vh;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* =========================
   MAIN CONTAINER
========================= */
.container {
  width: 100%;
  max-width: 420px;
  margin: 32px auto;
  padding: 24px;

  background: linear-gradient(
    180deg,
    #171a20,
    #12141a
  );

  border-radius: 20px;

  box-shadow:
    var(--shadow-strong),
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 0 40px rgba(212, 175, 55, 0.05);

  border: 1px solid var(--border-soft);
}

/* =========================
   HEADER
========================= */
h1 {
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin: 0 0 8px;
  background: linear-gradient(135deg, var(--gold), #f4c430);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
  font-weight: 400;
  letter-spacing: 0.2px;
}

/* =========================
   SEO CONTENT
========================= */
.seo-content {
  margin-bottom: 12px;
  padding: 12px;
  border-radius: 14px;

  background: rgba(255, 255, 255, 0.02);
  font-size: 12.5px;
  opacity: 0.7;
}

.seo-content h2 {
  font-size: 15px;
  margin-bottom: 6px;
}

.seo-content p {
  margin: 6px 0;
  opacity: 0.75;
  line-height: 1.5;
}

/* =========================
   CONTROLS
========================= */
.controls {
  position: relative;
  display: flex;
  width: 100%;
  align-items: center;
  margin-bottom: 16px;
}

input {
  flex: 1;
  padding: 16px 18px;
  font-size: 16px;
  font-weight: 400;

  background: linear-gradient(135deg, var(--card-bg), var(--card-bg-soft));
  color: var(--text-main);

  border-radius: 16px;
  border: 1px solid var(--border-soft);

  transition: all 0.3s ease;
  box-shadow: var(--shadow-soft);
}

.controls input {
  width: 95%;
  height: 48px;
  padding: 14px 42px 14px 16px; /* space for refresh */
  font-size: 16px;
  border-radius: 16px;
  box-sizing: border-box;
}

input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

input:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-soft), var(--shadow-medium);
  transform: translateY(-1px);
}

/* =========================
   REFRESH BUTTON
========================= */
.refresh-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;

  border: 1px solid var(--border-soft);
  background: linear-gradient(135deg, var(--card-bg), var(--card-bg-soft));
  color: var(--text-main);

  font-size: 20px;
  cursor: pointer;

  display: flex;
  align-items: center;
  justify-content: center;

  transition: all 0.3s ease;
  box-shadow: var(--shadow-soft);
}

.refresh-btn:hover {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px var(--gold-soft), var(--shadow-medium);
  transform: translateY(-2px) scale(1.05);
}

.refresh-btn:active {
  transform: translateY(0) scale(0.98);
}

.refresh-btn.loading {
  animation: spin 0.8s linear infinite;
  opacity: 0.7;
}

/* =========================
   STATUS
========================= */
.status {
  text-align: center;
  margin: 16px 0;
  font-size: 14px;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-soft);
  font-weight: 400;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.status:empty {
  display: none;
}

.status.hidden {
  opacity: 0;
  transform: translateY(-4px);
}

/* =========================
   PRICE GRID
========================= */
.prices {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 20px 0;
}

.price-card {
  background: linear-gradient(
    135deg,
    var(--card-bg),
    var(--card-bg-soft)
  );

  border-radius: 20px;
  padding: 20px 16px;
  text-align: center;

  border: 1px solid var(--border-soft);

  box-shadow: var(--shadow-medium);
  position: relative;
  overflow: hidden;

  transition: all 0.3s ease;
  cursor: pointer;
}

.price-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), #f4c430);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.price-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-strong);
  border-color: var(--border-medium);
}

.price-card:hover::before {
  opacity: 1;
}

.price-card span:first-child {
  font-size: 14px;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 8px;
  display: block;
  letter-spacing: 0.5px;
}

.price-card strong {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  display: block;
  margin-bottom: 6px;
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
}

/* =========================
   CHANGE INDICATOR
========================= */
.change {
  font-size: 12px;
  font-weight: 500;
  margin-top: 6px;
  padding: 4px 8px;
  border-radius: 12px;
  display: inline-block;
  transition: all 0.3s ease;
}

.change.up {
  color: var(--green);
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.change.down {
  color: var(--red);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.change.same {
  color: var(--text-muted);
  background: rgba(161, 161, 170, 0.1);
  border: 1px solid rgba(161, 161, 170, 0.2);
}

/* =========================
   DAILY INSIGHT
========================= */
.daily-insight {
  margin: 20px 0;
  padding: 16px 18px;

  background: linear-gradient(
    135deg,
    rgba(212, 175, 55, 0.15),
    rgba(212, 175, 55, 0.05)
  );

  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: 18px;

  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.2px;
  text-align: center;
  color: var(--text-accent);

  box-shadow: 0 8px 20px rgba(212, 175, 55, 0.15);
  position: relative;
  overflow: hidden;
}

.daily-insight::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(212, 175, 55, 0.1),
    transparent
  );
  animation: shimmer 4s infinite;
  opacity: 0.4;
}

/* =========================
   META INFO
========================= */
.meta {
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

/* =========================
   CHART
========================= */
.chart-wrapper {
  margin-top: 24px;
  padding: 20px;
  background: linear-gradient(135deg, var(--card-bg), var(--card-bg-soft));
  border-radius: 18px;
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-medium);
}

.chart-wrapper::before {
  content: "7-day price trend";
  display: block;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
  letter-spacing: 0.3px;
}

.chart-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.karat-btn {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 20px;

  border: 1px solid var(--border-soft);
  background: var(--card-bg);
  color: var(--text-muted);
  cursor: pointer;

  transition: all 0.3s ease;
}

.karat-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
  transform: translateY(-1px);
}

.karat-btn.active {
  background: linear-gradient(135deg, var(--gold), #f4c430);
  color: #000;
  border-color: var(--gold);
  box-shadow: 0 4px 12px var(--gold-glow);
}

/* Chart.js Custom Styling */
#historyChart {
  max-width: 100%;
  height: auto !important;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--card-bg), var(--card-bg-soft));
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Chart.js Tooltip Styling */
.chartjs-tooltip {
  background: linear-gradient(135deg, var(--card-bg), var(--card-bg-soft)) !important;
  border: 1px solid var(--border-medium) !important;
  border-radius: 12px !important;
  box-shadow: var(--shadow-strong) !important;
  color: var(--text-main) !important;
  font-family: inherit !important;
  font-size: 12px !important;
  padding: 8px 12px !important;
  opacity: 0.95 !important;
}

.chartjs-tooltip-title {
  color: var(--gold) !important;
  font-weight: 600 !important;
  margin-bottom: 4px !important;
}

.chartjs-tooltip-body {
  color: var(--text-accent) !important;
}

.chartjs-tooltip-arrow {
  color: var(--card-bg) !important;
}

/* Chart.js Grid and Axes */
.chartjs-grid {
  stroke: var(--border-soft) !important;
  stroke-width: 1px !important;
  opacity: 0.5 !important;
}

.chartjs-axis {
  color: var(--text-muted) !important;
  font-size: 11px !important;
  font-weight: 500 !important;
}

.chartjs-x-axis .chartjs-tick,
.chartjs-y-axis .chartjs-tick {
  color: var(--text-muted) !important;
}

/* Chart Line Styling */
.chartjs-line {
  stroke: var(--gold) !important;
  stroke-width: 3px !important;
  fill: rgba(212, 175, 55, 0.1) !important;
}

/* Chart Point Styling */
.chartjs-point {
  stroke: var(--gold) !important;
  stroke-width: 2px !important;
  fill: var(--card-bg) !important;
  r: 4px !important;
}

.chartjs-point:hover {
  r: 6px !important;
  stroke-width: 3px !important;
}

/* Chart Animation */
.chart-wrapper {
  animation: fadeInChart 0.6s ease-out;
}

@keyframes fadeInChart {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* =========================
   FAQ
========================= */
.faq-section {
  margin: 40px auto 0;
  padding: 20px;
  max-width: 420px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-medium);
}

.faq-section h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-main);
  text-align: center;
}

.faq-section summary {
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  padding: 12px 16px;
  background: var(--card-bg);
  border-radius: 12px;
  margin-bottom: 8px;
  transition: all 0.3s ease;
  border: 1px solid var(--border-soft);
}

.faq-section summary:hover {
  background: var(--card-bg-hover);
  border-color: var(--border-medium);
}

.faq-section details {
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 0;
  margin-bottom: 12px;
  background: var(--card-bg);
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-section details[open] {
  box-shadow: var(--shadow-soft);
  border-color: var(--border-medium);
}

.faq-section p {
  font-size: 14px;
  color: var(--text-muted);
  margin: 12px 16px;
  line-height: 1.5;
}

/* =========================
   SEO FOOTER TEXT
========================= */
.seo-text {
  width: 100%;
  max-width: 420px;
  margin: 20px auto;
  font-size: 12px;
  opacity: 0.55;
  text-align: center;
}

/* =========================
   RESPONSIVE DESIGN
========================= */
@media (max-width: 480px) {
  .container {
    margin: 16px auto;
    padding: 20px;
    border-radius: 16px;
  }

  h1 {
    font-size: 22px;
  }

  .prices {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .price-card {
    padding: 18px 14px;
  }

  .controls {
    flex-direction: column;
    gap: 12px;
  }

  .autocomplete {
    max-height: 200px;
  }

  .seo-content {
    font-size: 12px;
    opacity: 0.6;
  }
}

/* =========================
   ANIMATIONS
========================= */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes loading {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.price-card.loading {
  animation: pulse 1.5s ease-in-out infinite;
}

.price-card.loading strong {
  background: linear-gradient(90deg, var(--card-bg-soft), var(--border-soft), var(--card-bg-soft));
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  color: transparent;
  border-radius: 4px;
}

/* =========================
   AUTOCOMPLETE
========================= */
.autocomplete-wrapper {
  position: relative;
  width: 100%;
  flex: 1;
}

.autocomplete {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;

  background: linear-gradient(135deg, var(--card-bg), var(--card-bg-soft));
  border: 1px solid var(--border-medium);
  border-radius: 16px;

  overflow: hidden;
  max-height: 240px;
  z-index: 9999;

  box-shadow: var(--shadow-strong);
  backdrop-filter: blur(10px);
}

.autocomplete div {
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 400;
  cursor: pointer;
  transition: all 0.2s ease;
  border-bottom: 1px solid var(--border-soft);
}

.autocomplete div:last-child {
  border-bottom: none;
}

.autocomplete div:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--gold);
}

.autocomplete .highlight {
  background: rgba(212, 175, 55, 0.15);
  color: var(--gold);
  font-weight: 500;
}

.autocomplete.hidden {
  display: none !important;
}

/* =========================
   MOBILE SEARCH
========================= */
@media (max-width: 480px) {
  .controls {
    position: relative;
    flex-direction: row;
    gap: 0;
    width: 100%;
  }

  .autocomplete-wrapper {
    position: relative;
    flex: 1;
    width: 100%;
  }

  .controls input {
    width: 100%;
    height: 48px;
    padding: 14px 48px 14px 16px;
    font-size: 16px;
    border-radius: 16px;
    box-sizing: border-box;
  }

  .refresh-btn {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);

    width: 36px;
    height: 36px;
    font-size: 16px;

    border-radius: 50%;
    z-index: 2;
  }

  .autocomplete {
    max-height: 260px;
    border-radius: 14px;
  }

  .autocomplete div {
    padding: 16px;
    font-size: 16px;
  }
}