:root {
  --accent: oklch(68% 0.18 70);
  --accent-soft: oklch(68% 0.18 70 / 12%);

  /* Category colors */
  --accent-ml: oklch(72% 0.17 85);
  --accent-nlp: oklch(60% 0.15 230);
  --accent-rl: oklch(72% 0.19 145);
  --accent-ai: oklch(55% 0.25 300);

  /* Countdown */
  --countdown-bg: color-mix(in oklch, oklch(63% 0.24 27) 10%, white);
  --countdown-border: color-mix(in oklch, oklch(63% 0.24 27) 30%, white);
  --countdown-text: oklch(55% 0.22 27);
}

body {
  padding: 48px 24px 64px;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

header {
  margin-bottom: 48px;
  text-align: center;
}

h1 {
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  margin-bottom: 12px;
  color: var(--ink);
}

.subtitle {
  color: var(--ink-2);
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* CARDS CONTAINER */

#upcoming-deadlines,
#past-deadlines {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* CARD */

.deadline-card {
  position: relative;
  background: var(--bg-surface);
  padding: 24px 28px;
  border-radius: 16px;
  border: 1px solid var(--line);
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.04),
    0 4px 12px rgba(0, 0, 0, 0.03);
  transition:
    transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease),
    border-color 0.3s var(--ease);
  overflow: hidden;
}

/* Category accent strip */
.deadline-card::before {
  content: "";
  position: absolute;
  inset-y: 0;
  left: 0;
  width: 3px;
  background: var(--ink-3);
  opacity: 0.5;
  transition: opacity 0.3s var(--ease);
}

.deadline-card.ml::before {
  background: var(--accent-ml);
  opacity: 1;
}

.deadline-card.nlp::before {
  background: var(--accent-nlp);
  opacity: 1;
}

.deadline-card.rl::before {
  background: var(--accent-rl);
  opacity: 1;
}

.deadline-card.ai::before {
  background: var(--accent-ai);
  opacity: 1;
}

.deadline-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-hover);
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.04),
    0 10px 24px rgba(0, 0, 0, 0.08);
}

.deadline-card.ml:hover {
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.04),
    0 10px 24px rgba(0, 0, 0, 0.08),
    0 0 0 1px rgba(202, 138, 4, 0.15);
}

.deadline-card.nlp:hover {
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.04),
    0 10px 24px rgba(0, 0, 0, 0.08),
    0 0 0 1px rgba(2, 132, 199, 0.15);
}

.deadline-card.rl:hover {
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.04),
    0 10px 24px rgba(0, 0, 0, 0.08),
    0 0 0 1px rgba(22, 163, 74, 0.15);
}

.deadline-card.ai:hover {
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.04),
    0 10px 24px rgba(0, 0, 0, 0.08),
    0 0 0 1px rgba(147, 51, 234, 0.15);
}

.deadline-card.past {
  opacity: 0.55;
}

.deadline-card.past:hover {
  opacity: 0.7;
  transform: translateY(-2px);
}

/* HEADER */

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 18px;
  gap: 12px 20px;
  flex-wrap: wrap;
}

.conference-info {
  min-width: 0;
  flex: 1;
}

.conference-name {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 4px;
  letter-spacing: -0.025em;
  transition: color 0.2s var(--ease);
}

.conference-name:hover {
  color: var(--accent);
}

.conference-meta {
  font-size: 0.9rem;
  color: var(--ink-2);
  letter-spacing: -0.01em;
}

/* COUNTDOWN PILL */

.countdown {
  font-weight: 600;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  color: var(--countdown-text);
  white-space: nowrap;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--countdown-bg);
  border: 1px solid var(--countdown-border);
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.countdown.past {
  color: var(--ink-3);
  background: #f3f4f6;
  border-color: #e5e7eb;
}

/* DETAILS */

.deadline-details {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
}

.detail-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.detail-icon {
  width: 16px;
  height: 16px;
  color: var(--ink-3);
  flex-shrink: 0;
  stroke-width: 1.75;
}

.detail-value {
  color: var(--ink-2);
  letter-spacing: -0.01em;
}

.detail-value a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.detail-value a:hover {
  color: #4f46e5;
  text-decoration: underline;
  text-decoration-color: rgba(79, 70, 229, 0.4);
  text-underline-offset: 2px;
}

/* SECTION TITLE */

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 56px 0 20px 0;
  color: var(--ink-3);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

/* RESPONSIVE */

@media (max-width: 640px) {
  body {
    padding: 32px 16px 48px;
  }

  h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .deadline-card {
    padding: 20px 22px;
    border-radius: 14px;
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .countdown {
    align-self: flex-start;
  }

  .conference-name {
    font-size: 1.2rem;
  }
}