/* ==========================================================================
   Slider Input — premium white + amber-orange
   ========================================================================== */

:root {
  --text: #1c1c1e;
  --text-muted: #8e8e93;
  --accent: #f97316;
  --accent-deep: #ea580c;
  --accent-bright: #fb923c;
  --accent-glow: rgba(249, 115, 22, 0.35);
  --slider-height: 56px;
  --slider-width: min(460px, calc(100vw - 48px));
  --slider-radius: 4px;
  --inset: 4px;
  --font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.2, 0.64, 1);
  --progress: 0.29;
}

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

html,
body {
  width: 100%;
  height: 100%;
}

body {
  font-family: var(--font);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  background: #f5f5f7;
}

/* Studio-like canvas */
.scene {
  position: relative;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse 100% 80% at 50% 0%, rgba(255, 255, 255, 0.95) 0%, transparent 55%),
    radial-gradient(ellipse 70% 50% at 50% 100%, rgba(0, 0, 0, 0.03) 0%, transparent 50%),
    linear-gradient(180deg, #fafafa 0%, #f0f0f2 100%);
}

.scene::before {
  content: "";
  position: absolute;
  width: min(720px, 90vw);
  height: 280px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -42%);
  background: radial-gradient(
    ellipse at center,
    rgba(249, 115, 22, 0.06) 0%,
    transparent 68%
  );
  pointer-events: none;
  opacity: calc(0.35 + var(--progress) * 0.65);
  transition: opacity 0.35s var(--ease);
}

/* ---------- Wrap + ambient glow ---------- */

.slider-wrap {
  position: relative;
  width: var(--slider-width);
  z-index: 2;
}

.slider-glow {
  position: absolute;
  left: 0;
  top: 50%;
  height: 48px;
  width: calc(28px + var(--progress) * (100% - 28px));
  max-width: 100%;
  transform: translateY(-40%);
  border-radius: 50%;
  background: radial-gradient(
    ellipse at center,
    rgba(249, 115, 22, 0.45) 0%,
    rgba(249, 115, 22, 0.12) 45%,
    transparent 72%
  );
  filter: blur(18px);
  opacity: calc(0.25 + var(--progress) * 0.55);
  pointer-events: none;
  z-index: 0;
  transition: width 0.12s var(--ease), opacity 0.25s var(--ease);
}

/* ---------- Slider shell ---------- */

.slider {
  position: relative;
  z-index: 1;
  width: 100%;
  height: var(--slider-height);
  outline: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  cursor: pointer;
  transform: translateY(0) scale(1);
  transition:
    transform 0.22s var(--ease-spring),
    filter 0.22s var(--ease);
  filter: drop-shadow(0 14px 28px rgba(0, 0, 0, 0.08))
    drop-shadow(0 4px 10px rgba(0, 0, 0, 0.04));
}

.slider:hover:not(.is-dragging) {
  filter: drop-shadow(0 16px 32px rgba(0, 0, 0, 0.09))
    drop-shadow(0 4px 12px rgba(0, 0, 0, 0.05));
}

.slider.is-dragging {
  cursor: pointer;
  transform: translateY(1px) scale(0.995);
  filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.07))
    drop-shadow(0 2px 6px rgba(0, 0, 0, 0.04));
}

/* Premium white porcelain track */
.slider__track {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: var(--slider-radius);
  overflow: hidden;
  isolation: isolate;

  background:
    linear-gradient(
      180deg,
      #ffffff 0%,
      #fcfcfd 42%,
      #f4f4f6 100%
    );

  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow:
    0 0 0 0.5px rgba(255, 255, 255, 0.8),
    0 1px 0 rgba(255, 255, 255, 1),
    0 10px 30px rgba(0, 0, 0, 0.06),
    0 2px 8px rgba(0, 0, 0, 0.04),
    inset 0 2px 5px rgba(0, 0, 0, 0.035),
    inset 0 -1px 0 rgba(255, 255, 255, 0.9);
}

/* Inner rim polish */
.slider__track::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: 4;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.03),
    inset 1px 0 0 rgba(255, 255, 255, 0.5),
    inset -1px 0 0 rgba(0, 0, 0, 0.02);
}

/* Hairline border light */
.slider__track::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: 4;
  border: 1px solid rgba(255, 255, 255, 0.65);
  mix-blend-mode: soft-light;
}

/* Premium amber-orange fill */
.slider__fill {
  position: absolute;
  top: var(--inset);
  left: var(--inset);
  bottom: var(--inset);
  width: 29%;
  min-width: 28px;
  max-width: calc(100% - var(--inset) * 2);
  height: auto;
  border-radius: calc(var(--slider-radius) - 1px);
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 9px 0 0;
  overflow: hidden;
  transition: width 0s linear;

  background:
    /* top specular */
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.48) 0%,
      rgba(255, 255, 255, 0.12) 32%,
      transparent 50%
    ),
    /* rich body */
    linear-gradient(
      105deg,
      #ea580c 0%,
      #f97316 38%,
      #fb923c 72%,
      #fdba74 100%
    );

  box-shadow:
    0 2px 8px rgba(234, 88, 12, 0.32),
    0 1px 2px rgba(0, 0, 0, 0.08),
    3px 0 10px rgba(234, 88, 12, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.55),
    inset 0 -2px 4px rgba(154, 52, 18, 0.28),
    inset 1px 0 0 rgba(255, 255, 255, 0.2),
    inset -1px 0 0 rgba(154, 52, 18, 0.12);
}

/* Liquid highlight */
.slider__fill::before {
  content: "";
  position: absolute;
  left: 8%;
  right: 14%;
  top: 2px;
  height: 42%;
  border-radius: 999px;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.65) 0%,
    rgba(255, 255, 255, 0.15) 55%,
    transparent 100%
  );
  filter: blur(0.3px);
}

/* Soft under-edge shade */
.slider__fill::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 45%;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(120, 40, 0, 0.12) 100%
  );
}

.slider:not(.is-dragging) .slider__fill {
  transition:
    width 0.12s var(--ease),
    box-shadow 0.25s var(--ease);
}

.slider.is-dragging .slider__fill {
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.4) 0%,
      rgba(255, 255, 255, 0.1) 32%,
      transparent 50%
    ),
    linear-gradient(
      105deg,
      #dc2626 0%,
      #ea580c 35%,
      #f97316 70%,
      #fb923c 100%
    );
  box-shadow:
    0 1px 5px rgba(234, 88, 12, 0.28),
    0 1px 2px rgba(0, 0, 0, 0.08),
    2px 0 8px rgba(234, 88, 12, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.42),
    inset 0 -2px 5px rgba(127, 29, 29, 0.28),
    inset 1px 0 0 rgba(255, 255, 255, 0.15);
}

/* Grip */
.slider__grip {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 100%;
  flex-shrink: 0;
  cursor: pointer;
}

.slider.is-dragging .slider__grip {
  cursor: pointer;
}

/* Polished white handle */
.slider__bar {
  display: block;
  width: 3.5px;
  height: 22px;
  border-radius: 9999px;
  background: linear-gradient(
    90deg,
    #e8e8ed 0%,
    #ffffff 35%,
    #ffffff 65%,
    #ececf0 100%
  );
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.18),
    0 0 0 0.5px rgba(0, 0, 0, 0.05),
    inset 0 1px 0 #ffffff,
    inset 0 -1px 0 rgba(0, 0, 0, 0.06),
    inset 1px 0 0 rgba(255, 255, 255, 0.9);
  pointer-events: none;
  transition:
    transform 0.18s var(--ease-spring),
    box-shadow 0.18s var(--ease),
    height 0.18s var(--ease);
}

.slider.is-dragging .slider__bar {
  height: 20px;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.16),
    0 0 0 0.5px rgba(0, 0, 0, 0.05),
    inset 0 1px 0 #ffffff,
    inset 0 -1px 0 rgba(0, 0, 0, 0.08);
}

/* Value label */
.slider__value {
  position: absolute;
  top: 50%;
  right: 18px;
  transform: translateY(-50%);
  z-index: 3;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text-muted);
  line-height: 1;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
  transition:
    color 0.2s var(--ease),
    text-shadow 0.2s var(--ease),
    opacity 0.2s var(--ease);
}

.slider__value.is-on-fill {
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(120, 40, 0, 0.25);
}

.slider:focus-visible .slider__track {
  outline: 2px solid rgba(249, 115, 22, 0.45);
  outline-offset: 4px;
}

/* ---------- Responsive ---------- */

@media (max-width: 520px) {
  :root {
    --slider-height: 50px;
    --inset: 3px;
  }

  .slider__value {
    font-size: 13px;
    right: 14px;
  }

  .slider__fill {
    min-width: 26px;
    padding: 0 7px 0 0;
  }

  .slider__bar {
    height: 18px;
    width: 3px;
  }

  .slider.is-dragging .slider__bar {
    height: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .slider,
  .slider__fill,
  .slider__bar,
  .slider-glow,
  .scene::before {
    transition: none !important;
  }
}