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

:root {
  --bg:     #f4f5f7;
  --white:  #ffffff;

  /* Card accent colors — one per card, industry-standard palette */
  --c1:  #2563eb; /* blue       — Drone/Research   */
  --c2:  #16a34a; /* green      — Cost Estimation  */
  --c3:  #ea580c; /* orange     — Urban Corridor   */
  --c4:  #7c3aed; /* violet     — Surveying        */
  --c5:  #dc2626; /* red        — Structural       */
  --c6:  #0891b2; /* cyan       — Mentorship       */
  --t1:  #111827;
  --t2:  #6b7280;
  --border: #e5e7eb;

  --cw:   330px;
  --gap:  22px;
  --ease: cubic-bezier(.16,1,.3,1);
  --r:    18px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  font-family: 'Sora', sans-serif;
  color: var(--t1);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ── section ── */
.wid {
  padding: 88px 0 72px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── header ── */

/* ── slider ── */
.slider {
  position: relative;
  width: 100%;
  display: flex; flex-direction: column; align-items: center;
}
.zone {
  position: absolute; top: 0; bottom: 72px;
  width: 15%; z-index: 10; cursor: none;
}
.zone--l { left: 0; }
.zone--r { right: 0; }

.track-wrap {
  width: 100%;
  overflow: hidden;
  padding: 28px 0 40px;
  cursor: grab;
  user-select: none;
  touch-action: pan-y;
}
.track-wrap.is-dragging { cursor: grabbing; }
.track {
  display: flex;
  gap: var(--gap);
  will-change: transform;
  padding-left: 0;
  padding-right: 0;
}

/* ── card ── */
.slider .card {
  flex: 0 0 var(--cw); width: var(--cw);
  background: var(--white);
  border-radius: var(--r);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  transform: scale(.96) translateY(6px);
  transition:
    transform .4s var(--ease),
    box-shadow .4s var(--ease),
    opacity .38s ease;
  cursor: default;
  --accent: var(--c1);
}
.slider .card[data-i="0"] { --accent: var(--c1); }
.slider .card[data-i="1"] { --accent: var(--c2); }
.slider .card[data-i="2"] { --accent: var(--c3); }
.slider .card[data-i="3"] { --accent: var(--c4); }
.slider .card[data-i="4"] { --accent: var(--c5); }
.slider .card[data-i="5"] { --accent: var(--c6); }

.slider .card.center {
  opacity: 1;
  transform: scale(1) translateY(0);
  box-shadow: 0 16px 48px rgba(0,0,0,.12), 0 4px 12px rgba(0,0,0,.08);
}
.slider .card:hover {
  opacity: 1 !important;
  transform: translateY(-10px) scale(1.016) !important;
  box-shadow: 0 20px 56px rgba(0,0,0,.14), 0 4px 14px rgba(0,0,0,.08) !important;
  z-index: 5;
}

/* colored top band — the accent strip */
.slider .card__band {
  height: 6px;
  background: var(--accent);
}

/* image */
.slider .card__img-wrap {
  position: relative;
  width: 100%; height: 192px; overflow: hidden;
}
.slider .card__img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .6s var(--ease);
  filter: saturate(.8) brightness(.95);
}
.slider .card:hover .card__img { transform: scale(1.07); filter: saturate(1) brightness(1); }
.slider .card__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,.22) 100%);
  pointer-events: none;
}

/* body */
.slider .card__body {
  padding: 22px 22px 24px;
  display: flex; flex-direction: column; gap: 12px;
}

/* icon */
.slider .card__icon {
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 10%, white);
  transition: background .3s ease, transform .35s var(--ease);
}
.slider .card__icon svg {
  width: 20px; height: 20px;
  stroke: var(--accent); fill: none; stroke-width: 1.7;
  transition: transform .35s var(--ease);
}
.slider .card:hover .card__icon {
  background: var(--accent);
  transform: scale(1.05);
}
.slider .card:hover .card__icon svg { stroke: #fff; transform: rotate(8deg); }

/* title */
.slider .card__title {
  font-family: 'Lora', serif;
  font-size: 19px; font-weight: 600;
  line-height: 1.3; letter-spacing: -.01em;
  color: var(--t1);
  transition: color .3s ease;
}
.slider .card:hover .card__title { color: var(--accent); }

/* desc */
.slider .card__desc {
  font-size: 13.5px; font-weight: 300;
  color: var(--t2); line-height: 1.76;
}

/* tags */
.slider .card__tags { display: flex; gap: 7px; flex-wrap: wrap; }
.slider .card__tag {
  font-size: 10px; font-weight: 500;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent);
  padding: 3px 10px; border-radius: 5px;
  background: color-mix(in srgb, var(--accent) 9%, white);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, white);
  transition: background .25s ease, color .25s ease;
}
.slider .card:hover .card__tag {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* entry animation */
.slider .card { --d:0s; animation: cardIn .7s var(--ease) var(--d) both; }
@keyframes cardIn {
  from { opacity:0; transform: translateY(30px) scale(.96); }
  to   { opacity:.65; transform: translateY(6px) scale(.96); }
}
.slider .card.center { animation: cardInC .7s var(--ease) var(--d) both; }
@keyframes cardInC {
  from { opacity:0; transform: translateY(30px) scale(.96); }
  to   { opacity:1; transform: translateY(0) scale(1); }
}
.slider .card.done { animation: none !important; }

/* ── dots ── */
.dots { display: flex; gap: 8px; align-items: center; margin-top: 6px; }
.dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: #d1d5db; border: none; cursor: pointer; padding: 0;
  transition: width .35s var(--ease), background .3s ease;
}
.dot.active { width: 24px; border-radius: 4px; background: #2563eb; }
.dot:hover:not(.active) { background: #9ca3af; }

/* progress */
.prog-wrap { width: 160px; height: 2px; background: #e5e7eb; border-radius: 2px; margin-top: 14px; overflow: hidden; }
.prog-bar { height: 100%; background: #2563eb; width: 0%; transition: width .4s var(--ease); border-radius: 2px; }

/* cursor */
#cursor {
  position: fixed; pointer-events: none; z-index: 9999;
  width: 40px; height: 40px; display: none;
  align-items: center; justify-content: center;
  background: rgba(37,99,235,.1);
  border: 1.5px solid rgba(37,99,235,.4);
  border-radius: 50%;
  transform: translate(-50%,-50%);
}
#cursor.show { display: flex; }
#cursor svg { width: 14px; height: 14px; stroke: #2563eb; fill: none; stroke-width: 2.2; }

/* ── responsive ── */
@media (max-width: 1100px) {
  :root { --cw: 298px; --gap: 18px; }
  .track {
    padding-left: 0;
    padding-right: 0;
  }
}
@media (max-width: 800px) {
  :root { --cw: 82vw; --gap: 14px; }
  .wid { padding: 56px 0 48px; }
  .zone { display: none; }
  #cursor { display: none !important; }
  .track-wrap {
    overflow-x: auto; -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory; scrollbar-width: none; padding: 12px 0 36px;
  }
  .track-wrap::-webkit-scrollbar { display: none; }
  .track {
    width: max-content; transform: none !important; transition: none !important;
    padding-left: 0;
    padding-right: 0;
  }
  .slider .card { scroll-snap-align: start; opacity: 1 !important; transform: none !important; }
  .slider .card:hover { transform: none !important; }
  .slider .card__img-wrap { height: 164px; }
}
@media (max-width: 480px) {
  :root { --cw: 90vw; }
}

/* Theme support: this file loads after style.css */
html.dark-mode {
  --bg: #0d1020;
  --white: #151a2e;
  --t1: #f4f7ff;
  --t2: #b8c0d8;
  --border: rgba(255,255,255,.12);
}

html.dark-mode body {
  background: #0d1020;
  color: var(--t1);
}

html.dark-mode .slider .card {
  background: #151a2e;
  border-color: rgba(255,255,255,.12);
  box-shadow: 0 18px 48px rgba(0,0,0,.36);
}

html.dark-mode .slider .card.center,
html.dark-mode .slider .card:hover {
  box-shadow: 0 24px 64px rgba(0,0,0,.48) !important;
}

html.dark-mode .slider .card__title {
  color: #f4f7ff;
}

html.dark-mode .slider .card__desc {
  color: #b8c0d8;
}

html.dark-mode .slider .card__icon,
html.dark-mode .slider .card__tag {
  background: color-mix(in srgb, var(--accent) 16%, #151a2e);
  border-color: color-mix(in srgb, var(--accent) 32%, #151a2e);
}

html.dark-mode .dot {
  background: rgba(255,255,255,.24);
}

html.dark-mode .prog-wrap {
  background: rgba(255,255,255,.18);
}

.expertise .slider .card:hover .card__title {
  color: #111827;
}

.expertise .slider .card:hover .card__desc {
  color: #374151;
}

.expertise .slider .card:hover .card__tag {
  background: color-mix(in srgb, var(--accent) 18%, white);
  color: #111827;
  border-color: color-mix(in srgb, var(--accent) 48%, white);
}

html.dark-mode .expertise .slider .card:hover .card__title,
html.dark-mode .expertise .slider .card:hover .card__desc,
html.dark-mode .expertise .slider .card:hover .card__tag {
  color: #fff;
}

html.dark-mode .expertise .slider .card:hover .card__tag {
  background: color-mix(in srgb, var(--accent) 34%, #151a2e);
  border-color: color-mix(in srgb, var(--accent) 62%, #151a2e);
}

html {
  overflow-y: auto;
}

body {
  overflow-y: visible;
  overscroll-behavior-y: auto;
}

/* Expertise controls: keep buttons/progress steady, while cards keep their animation. */
.expertise .dots,
.expertise .dot,
.expertise .prog-wrap,
.expertise .prog-bar {
  animation: none !important;
  transition: none !important;
}

@media (max-width: 800px) {
  .expertise .track-wrap {
    width: 100vw !important;
    max-width: 100vw !important;
    margin-left: calc(50% - 50vw) !important;
    margin-right: calc(50% - 50vw) !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: 16px;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x pan-y;
    padding: 12px 16px 36px !important;
  }

  .expertise .track {
    display: flex !important;
    flex-wrap: nowrap !important;
    gap: 14px !important;
    width: max-content !important;
    min-width: max-content !important;
    transform: none !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
  }

  .expertise .slider .card {
    flex: 0 0 min(86vw, 330px) !important;
    width: min(86vw, 330px) !important;
    max-width: min(86vw, 330px) !important;
    scroll-snap-align: center;
    scroll-snap-stop: always;
  }
}