/*
=================================================================
  WORLD POPULATION MILESTONE TRACKER — CSS (Updated)
  Background   → white #ffffff / soft grey #f0f4f8
  Cards        → #ffffff  border #dde4ee
  Hero header  → deep blue gradient #0f4c8a → #1976d2
  Accent blues → #0288d1 · #1976d2
  Teal         → #00897b
  Red          → #e53935
  Headings     → #1a2332
  Labels       → #6b7a90
  Fonts        → bumped up across the board
=================================================================
*/
 
/* ══════════════════════════════════════════════════
   VARIABLES
══════════════════════════════════════════════════ */
#wpt-root {
  --bg:          #f0f4f8;
  --white:       #ffffff;
  --border:      #dde4ee;
  --shadow:      0 2px 16px rgba(15,76,138,0.08);
  --shadow-lg:   0 8px 40px rgba(15,76,138,0.14);
  --blue-dark:   #0f4c8a;
  --blue-mid:    #1976d2;
  --blue-light:  #0288d1;
  --teal:        #00897b;
  --red:         #e53935;
  --orange:      #f57c00;
  --navy:        #1a2332;
  --label:       #6b7a90;
  --dim:         #a0aec0;
  --radius:      16px;
  --radius-sm:   10px;
  --track-h:     10px;
  --thumb-sz:    46px;
  --ease:        0.22s cubic-bezier(0.16,1,0.3,1);
  --font-head:   'Syne', sans-serif;
  --font-body:   'DM Sans', sans-serif;
  --font-mono:   'DM Mono', monospace;
}
 
/* ══════════════════════════════════════════════════
   ROOT
══════════════════════════════════════════════════ */
#wpt-root,
#wpt-root * { box-sizing: border-box; margin: 0; padding: 0; }
 
#wpt-root {
  background: var(--bg);
  font-family: var(--font-body);
  color: var(--navy);
  padding: 0 0 52px;
  border-radius: var(--radius);
  overflow: hidden;
  isolation: isolate;
  position: relative;
}
 
/* Subtle dot-grid on light bg */
#wpt-root .wpt-bg-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(15,76,138,0.055) 1px, transparent 1px);
  background-size: 30px 30px;
  pointer-events: none;
  z-index: 0;
}
 
#wpt-root .wpt-bg-glow { display: none; } /* not needed on light bg */
 
/* ══════════════════════════════════════════════════
   CONTAINER
══════════════════════════════════════════════════ */
#wpt-root .wpt-container {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 0 24px;
}
 
/* ══════════════════════════════════════════════════
   HEADER — deep blue gradient banner (same as other tools)
══════════════════════════════════════════════════ */
#wpt-root .wpt-header {
  background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-mid) 100%);
  color: var(--white);
  text-align: center;
  padding: 48px 36px 42px;
  position: relative;
  overflow: hidden;
  /* no border-radius on top so it bleeds edge-to-edge */
  margin-bottom: 4px;
}
 
/* Radial glow overlays */
#wpt-root .wpt-header::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(255,255,255,0.09) 0%, transparent 52%),
    radial-gradient(circle at 10% 82%, rgba(2,136,209,0.22) 0%, transparent 50%);
  pointer-events: none;
}
 
/* Decorative concentric rings */
#wpt-root .wpt-header::after {
  content: '';
  position: absolute; right: -60px; top: -60px;
  width: 240px; height: 240px; border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.10);
  box-shadow:
    0 0 0 40px rgba(255,255,255,0.04),
    0 0 0 80px rgba(255,255,255,0.022);
  pointer-events: none;
}
 
#wpt-root .wpt-header-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.72);
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: 100px;
  padding: 6px 20px;
  margin-bottom: 20px;
  position: relative; z-index: 1;
}
 
#wpt-root .wpt-title {
  font-family: var(--font-head);
  font-size: clamp(32px, 5.5vw, 54px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -1px;
  color: var(--white);
  margin-bottom: 16px;
  position: relative; z-index: 1;
}
 
/* Italic part gets a bright white→sky gradient */
#wpt-root .wpt-title em {
  font-style: normal;
  background: linear-gradient(135deg, #ffffff 0%, #90caf9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
 
#wpt-root .wpt-subtitle {
  font-size: 17px;
  font-weight: 300;
  color: rgba(255,255,255,0.74);
  line-height: 1.7;
  position: relative; z-index: 1;
}
 
/* ══════════════════════════════════════════════════
   DISPLAY CARD
══════════════════════════════════════════════════ */
#wpt-root .wpt-display-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 36px;
  box-shadow: var(--shadow);
  transition: box-shadow var(--ease);
}
 
#wpt-root .wpt-display-card.wpt-active {
  box-shadow:
    0 0 0 2px rgba(25,118,210,0.10),
    var(--shadow-lg);
}
 
/* 3-column top */
#wpt-root .wpt-card-top {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 26px;
}
 
#wpt-root .wpt-card-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--label);
  margin-bottom: 10px;
}
 
/* Year column */
#wpt-root .wpt-year-value {
  font-family: var(--font-head);
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.1;
  margin-bottom: 8px;
  transition: all var(--ease);
}
 
#wpt-root .wpt-year-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--blue-mid);
  background: rgba(25,118,210,0.08);
  border: 1px solid rgba(25,118,210,0.18);
  border-radius: 100px;
  padding: 3px 12px;
}
 
/* Population column */
#wpt-root .wpt-pop-block { text-align: center; }
 
#wpt-root .wpt-pop-value {
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 800;
  color: var(--navy);
  line-height: 1.05;
  margin-bottom: 6px;
  transition: all var(--ease);
}
 
#wpt-root .wpt-pop-raw {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--label);
  transition: all var(--ease);
}
 
/* Milestone column */
#wpt-root .wpt-milestone-block { text-align: right; }
 
#wpt-root .wpt-milestone-badge {
  font-family: var(--font-head);
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 800;
  color: var(--blue-mid);
  line-height: 1.1;
  margin-bottom: 6px;
  transition: all var(--ease);
}
 
#wpt-root .wpt-milestone-name {
  font-size: 14px;
  color: var(--label);
  font-weight: 400;
  transition: all var(--ease);
}
 
/* Horizontal divider */
#wpt-root .wpt-card-divider {
  height: 1px;
  background: var(--border);
  margin-bottom: 24px;
}
 
/* Insight row */
#wpt-root .wpt-insight-wrap {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 26px;
}
 
#wpt-root .wpt-insight-icon {
  font-size: 32px;
  flex-shrink: 0;
  line-height: 1;
  transition: all var(--ease);
}
 
#wpt-root .wpt-insight-text {
  font-size: 15px;
  color: var(--label);
  line-height: 1.80;
  font-weight: 400;
  transition: all var(--ease);
}
 
/* Growth stats strip (3 boxes) */
#wpt-root .wpt-growth-row {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg);
}
 
#wpt-root .wpt-growth-item {
  flex: 1;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
 
#wpt-root .wpt-growth-sep {
  width: 1px;
  background: var(--border);
  flex-shrink: 0;
}
 
#wpt-root .wpt-growth-lbl {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--dim);
}
 
#wpt-root .wpt-growth-val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--blue-mid);
  transition: all var(--ease);
}
 
/* ══════════════════════════════════════════════════
   SLIDER SECTION
══════════════════════════════════════════════════ */
#wpt-root .wpt-slider-section {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 32px 22px;
}
 
/* Era labels above track */
#wpt-root .wpt-era-labels {
  display: flex;
  justify-content: space-between;
  margin-bottom: 16px;
}
 
#wpt-root .wpt-era-labels span {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--dim);
}
 
/* Track wrapper */
#wpt-root .wpt-track-wrap {
  position: relative;
  height: 64px;
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  padding: 0 8px;
}
 
/* Base track */
#wpt-root .wpt-track-wrap::before {
  content: '';
  position: absolute;
  left: 8px; right: 8px;
  top: 50%;
  transform: translateY(-50%);
  height: var(--track-h);
  border-radius: 100px;
  background: var(--border);
  border: 1px solid #c8d3e4;
  pointer-events: none;
}
 
/* Filled portion */
#wpt-root .wpt-track-fill {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  height: var(--track-h);
  border-radius: 100px;
  background: linear-gradient(90deg,
    var(--blue-dark) 0%,
    var(--blue-mid)  40%,
    var(--blue-light) 72%,
    var(--teal)      100%);
  width: 0%;
  transition: width 0.05s linear;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(25,118,210,0.22);
}
 
/* Milestone dots on the track */
#wpt-root .wpt-milestone-dots {
  position: absolute;
  left: 8px; right: 8px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}
 
#wpt-root .wpt-dot {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--border);
  transition: all 0.2s ease;
  pointer-events: none;
  cursor: pointer;
}
 
#wpt-root .wpt-dot.wpt-dot-passed {
  background: var(--blue-mid);
  border-color: var(--blue-mid);
  box-shadow: 0 0 5px rgba(25,118,210,0.35);
}
 
#wpt-root .wpt-dot.wpt-dot-current {
  width: 16px;
  height: 16px;
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 10px rgba(245,124,0,0.45);
}
 
/* Draggable thumb */
#wpt-root .wpt-thumb {
  position: absolute;
  top: 50%;
  left: 0%;
  transform: translate(-50%, -50%);
  width: var(--thumb-sz);
  height: var(--thumb-sz);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue-mid));
  border: 3px solid var(--white);
  box-shadow:
    0 0 0 3px rgba(25,118,210,0.20),
    0 4px 14px rgba(25,118,210,0.30),
    0 8px 24px rgba(0,0,0,0.10);
  cursor: grab;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: box-shadow 0.2s ease, transform 0.1s ease;
}
 
#wpt-root .wpt-thumb:active,
#wpt-root .wpt-thumb.wpt-dragging {
  cursor: grabbing;
  transform: translate(-50%, -50%) scale(1.12);
  box-shadow:
    0 0 0 5px rgba(25,118,210,0.28),
    0 6px 20px rgba(25,118,210,0.40),
    0 12px 32px rgba(0,0,0,0.14);
}
 
#wpt-root .wpt-thumb-inner {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255,255,255,0.95);
}
 
/* Tooltip above thumb */
#wpt-root .wpt-thumb-tooltip {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--navy);
  border-radius: 8px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #fff;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: 0 4px 14px rgba(0,0,0,0.18);
}
 
#wpt-root .wpt-thumb-tooltip::after {
  content: '';
  position: absolute;
  top: 100%; left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--navy);
}
 
/* Native range — invisible, handles a11y + mobile */
#wpt-root .wpt-range-input {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 5;
  margin: 0; padding: 0;
  -webkit-appearance: none;
  appearance: none;
}
 
/* Year labels below track */
#wpt-root .wpt-year-markers {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
}
 
#wpt-root .wpt-year-marker {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--dim);
  text-align: center;
  white-space: nowrap;
}
 
#wpt-root .wpt-year-marker.wpt-marker-active {
  color: var(--blue-mid);
  font-weight: 600;
}
 
/* ══════════════════════════════════════════════════
   MILESTONE QUICK-JUMP CHIPS
══════════════════════════════════════════════════ */
#wpt-root .wpt-milestones-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
 
#wpt-root .wpt-milestones-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--label);
  white-space: nowrap;
  flex-shrink: 0;
}
 
#wpt-root .wpt-milestones-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
 
#wpt-root .wpt-chip {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--label);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 7px 18px;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
  box-shadow: var(--shadow);
}
 
#wpt-root .wpt-chip:hover {
  background: rgba(25,118,210,0.06);
  border-color: rgba(25,118,210,0.28);
  color: var(--blue-mid);
  box-shadow: 0 2px 8px rgba(25,118,210,0.12);
}
 
#wpt-root .wpt-chip.wpt-chip-active {
  background: var(--blue-mid);
  border-color: var(--blue-mid);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(25,118,210,0.32);
}
 
/* ══════════════════════════════════════════════════
   DATA STRIP (progress bar)
══════════════════════════════════════════════════ */
#wpt-root .wpt-data-strip {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 28px;
  box-shadow: var(--shadow);
}
 
#wpt-root .wpt-data-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 500;
  color: var(--label);
  margin-bottom: 12px;
}
 
#wpt-root .wpt-data-bar-track {
  height: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 100px;
  overflow: hidden;
}
 
#wpt-root .wpt-data-bar-fill {
  height: 100%;
  border-radius: 100px;
  background: linear-gradient(90deg,
    var(--blue-dark),
    var(--blue-mid),
    var(--blue-light),
    var(--teal));
  width: 0%;
  transition: width var(--ease);
  box-shadow: 0 1px 4px rgba(25,118,210,0.20);
}
 
/* ══════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════ */
#wpt-root .wpt-footer {
  font-size: 12px;
  color: var(--dim);
  text-align: center;
  line-height: 1.65;
  padding-top: 4px;
}
 
/* ══════════════════════════════════════════════════
   ANIMATIONS
══════════════════════════════════════════════════ */
@keyframes wptFadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
 
@keyframes wptPulse {
  0%, 100% {
    box-shadow:
      0 0 0 3px rgba(25,118,210,0.20),
      0 4px 14px rgba(25,118,210,0.28),
      0 8px 24px rgba(0,0,0,0.10);
  }
  50% {
    box-shadow:
      0 0 0 6px rgba(25,118,210,0.28),
      0 4px 20px rgba(25,118,210,0.40),
      0 8px 28px rgba(0,0,0,0.12);
  }
}
 
@keyframes wptValueChange {
  0%   { opacity: 0.45; transform: translateY(-5px); }
  100% { opacity: 1;    transform: translateY(0); }
}
 
/* Staggered entrance */
#wpt-root .wpt-header        { animation: wptFadeUp 0.60s cubic-bezier(0.16,1,0.3,1) both; }
#wpt-root .wpt-display-card  { animation: wptFadeUp 0.60s 0.10s cubic-bezier(0.16,1,0.3,1) both; }
#wpt-root .wpt-slider-section{ animation: wptFadeUp 0.60s 0.18s cubic-bezier(0.16,1,0.3,1) both; }
#wpt-root .wpt-milestones-row{ animation: wptFadeUp 0.60s 0.24s cubic-bezier(0.16,1,0.3,1) both; }
#wpt-root .wpt-data-strip    { animation: wptFadeUp 0.60s 0.30s cubic-bezier(0.16,1,0.3,1) both; }
 
/* Thumb pulse */
#wpt-root .wpt-thumb          { animation: wptPulse 2s ease infinite; }
#wpt-root .wpt-thumb.wpt-dragging { animation: none; }
 
/* Value change flash */
#wpt-root .wpt-value-animate  { animation: wptValueChange 0.20s ease both; }
 
/* ══════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════ */
@media (max-width: 640px) {
  #wpt-root .wpt-header {
    padding: 36px 22px 32px;
  }
  #wpt-root .wpt-title {
    font-size: clamp(26px, 7vw, 38px);
    letter-spacing: -0.5px;
  }
  #wpt-root .wpt-subtitle { font-size: 15px; }
 
  #wpt-root .wpt-container { padding: 0 16px; }
 
  #wpt-root .wpt-display-card {
    padding: 22px 20px;
  }
  #wpt-root .wpt-card-top {
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }
  #wpt-root .wpt-milestone-block {
    grid-column: 1 / -1;
    text-align: left;
  }
 
  #wpt-root .wpt-slider-section { padding: 22px 20px 18px; }
  #wpt-root .wpt-era-labels { display: none; }
  #wpt-root .wpt-year-markers { display: none; }
 
  #wpt-root .wpt-growth-row  { flex-direction: column; }
  #wpt-root .wpt-growth-sep  { width: 100%; height: 1px; }
  #wpt-root .wpt-insight-wrap{ flex-direction: column; gap: 10px; }
 
  #wpt-root .wpt-milestones-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  #wpt-root .wpt-pop-block { text-align: left; }
}
 
@media (max-width: 400px) {
  #wpt-root .wpt-card-top { grid-template-columns: 1fr; }
  #wpt-root .wpt-milestone-block { grid-column: auto; }