/* Engineering OS — custom UI on top of Material for MkDocs */

:root {
  --eos-banner-gradient: linear-gradient(135deg, #312e81 0%, #4c1d95 45%, #5b21b6 100%);
  --eos-card-shadow: 0 4px 14px rgba(15, 23, 42, 0.12);
  --eos-card-shadow-hover: 0 10px 28px rgba(15, 23, 42, 0.18);
  --eos-radius: 12px;
}

[data-md-color-scheme="slate"] {
  --eos-banner-gradient: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4c1d95 100%);
  --eos-card-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
  --eos-card-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.45);
}

/* --- Homepage banner --- */
.eos-banner {
  border-radius: var(--eos-radius);
  padding: 2.5rem 2rem;
  margin-bottom: 2rem;
  background: var(--eos-banner-gradient);
  color: #f8fafc;
  box-shadow: var(--eos-card-shadow);
}

.eos-banner h1 {
  margin: 0 0 0.5rem 0;
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.eos-banner .eos-tagline {
  font-size: 1.15rem;
  opacity: 0.95;
  margin: 0 0 1rem 0;
  font-weight: 500;
}

.eos-banner .eos-lead {
  max-width: 52rem;
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.65;
  opacity: 0.92;
}

/* --- Card grid (homepage & section intros) --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 2rem 0;
}

.card {
  display: block;
  border-radius: var(--eos-radius);
  padding: 1.35rem 1.25rem;
  text-decoration: none !important;
  color: inherit !important;
  border: 1px solid var(--md-default-fg-color--lightest, rgba(0, 0, 0, 0.08));
  background: var(--md-default-bg-color);
  box-shadow: var(--eos-card-shadow);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--eos-card-shadow-hover);
  border-color: var(--md-accent-fg-color, #7c3aed);
}

.card h3 {
  margin: 0 0 0.5rem 0;
  font-size: 1.1rem;
  font-weight: 700;
}

.card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  opacity: 0.88;
}

/* Per-card accent borders */
.card.card-dsa {
  border-top: 4px solid #6366f1;
}
.card.card-db {
  border-top: 4px solid #0ea5e9;
}
.card.card-net {
  border-top: 4px solid #14b8a6;
}
.card.card-be {
  border-top: 4px solid #22c55e;
}
.card.card-sd {
  border-top: 4px solid #f59e0b;
}
.card.card-ai {
  border-top: 4px solid #a855f7;
}
.card.card-resume {
  border-top: 4px solid #ec4899;
}
.card.card-behavioral {
  border-top: 4px solid #f43f5e;
}
.card.card-career {
  border-top: 4px solid #64748b;
}

/* --- Concept / callout boxes --- */
.topic-box {
  border-radius: var(--eos-radius);
  padding: 1rem 1.15rem;
  margin: 1rem 0;
  border-left: 4px solid #6366f1;
  background: color-mix(in srgb, #6366f1 12%, transparent);
}

[data-md-color-scheme="slate"] .topic-box {
  background: color-mix(in srgb, #6366f1 22%, transparent);
}

.info-box {
  border-radius: var(--eos-radius);
  padding: 1rem 1.15rem;
  margin: 1rem 0;
  border-left: 4px solid #0ea5e9;
  background: color-mix(in srgb, #0ea5e9 12%, transparent);
}

[data-md-color-scheme="slate"] .info-box {
  background: color-mix(in srgb, #0ea5e9 20%, transparent);
}

.warning-box {
  border-radius: var(--eos-radius);
  padding: 1rem 1.15rem;
  margin: 1rem 0;
  border-left: 4px solid #f59e0b;
  background: color-mix(in srgb, #f59e0b 14%, transparent);
}

[data-md-color-scheme="slate"] .warning-box {
  background: color-mix(in srgb, #f59e0b 22%, transparent);
}

.topic-box strong,
.info-box strong,
.warning-box strong {
  display: block;
  margin-bottom: 0.35rem;
}

/* --- Mermaid inside content --- */
.mermaid {
  margin: 1rem 0;
  text-align: center;
}

/* --- Slight typography polish for long-form pages --- */
.md-typeset h1 {
  font-weight: 800;
  letter-spacing: -0.02em;
}