/*
 * home.css — Styles for the OSI landing page (overrides/home.html).
 *
 * Modern, clean design with white background, subtle gradients,
 * and blue/purple accents. Borrows patterns from tech-forward
 * landing pages while keeping OSI's content and brand identity.
 *
 * Global design tokens and Bootstrap overrides live in global.css.
 */


/* ==========================================================================
   Hero Section
   ========================================================================== */

.osi-hero {
  background: var(--osi-white);
  color: var(--osi-gray-900);
  position: relative;
  overflow: hidden;
  padding-top: 5rem;
  padding-bottom: 4rem;
}

.osi-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  left: 20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 147, 199, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.osi-hero::after {
  content: "";
  position: absolute;
  bottom: -10%;
  right: 15%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.osi-hero h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--osi-gray-900);
}

.osi-hero__subtitle {
  color: var(--osi-gray-500);
  line-height: 1.6;
  font-size: 0.85rem;
}

.osi-hero .btn-primary {
  padding: 0.5rem 1.25rem;
  font-size: 0.8rem;
}

.osi-hero .btn-outline-secondary {
  padding: 0.5rem 1.25rem;
  font-size: 0.8rem;
}

.osi-btn-icon {
  vertical-align: -0.15em;
  margin-right: 0.35em;
}


/* ==========================================================================
   Stats / Trust Bar (below hero)
   ========================================================================== */

.osi-stats-bar {
  border-top: 1px solid var(--osi-gray-200);
  margin-top: 3rem;
  padding-top: 2rem;
}

.osi-stat {
  text-align: center;
}

.osi-stat__value {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--osi-gray-900);
  display: block;
}

.osi-stat__label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--osi-gray-400);
  margin-top: 0.25rem;
  display: block;
}


/* ==========================================================================
   Code / Specification Section
   ========================================================================== */

.osi-code-section {
  background: var(--osi-gray-50);
  border-bottom: 1px solid var(--osi-gray-100);
  position: relative;
}

.osi-code-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--osi-primary-blue), var(--osi-accent-purple), transparent);
  opacity: 0.3;
}

.osi-code-section h2 {
  color: var(--osi-gray-900);
}

.osi-code-section h2 {
  font-size: 1.05rem;
}

.osi-code-section .osi-text-gradient {
  background: linear-gradient(135deg, var(--osi-primary-blue), var(--osi-accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.osi-code-section p {
  font-size: 0.75rem;
}

.osi-check-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.osi-check-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.osi-check-icon {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--osi-light-blue);
  border: 1px solid rgba(0, 147, 199, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.15rem;
  color: var(--osi-primary-blue);
  font-size: 0.7rem;
}

.osi-check-item h3 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--osi-gray-900);
  margin: 0 0 0.2rem;
}

.osi-check-item p {
  color: var(--osi-gray-500);
  font-size: 0.75rem;
  margin: 0;
  line-height: 1.5;
}

/* Code block (terminal style) */
.osi-code-block {
  background: var(--osi-gray-900);
  border-radius: 0.75rem;
  border: 1px solid var(--osi-gray-800);
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}

.osi-code-block__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.osi-code-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
}

.osi-code-dot--red { background: #EF4444; }
.osi-code-dot--yellow { background: #F59E0B; }
.osi-code-dot--green { background: #22C55E; }

.osi-code-block__filename {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.75rem;
  color: var(--osi-gray-400);
  margin-left: 0.5rem;
}

.osi-code-block__body {
  padding: 1rem;
  overflow-x: auto;
}

.osi-code-block pre {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.65rem;
  line-height: 1.7;
  margin: 0;
  color: var(--osi-gray-300);
}

.osi-code-block .osi-yaml-key { color: #C084FC; }
.osi-code-block .osi-yaml-prop { color: #60A5FA; }
.osi-code-block .osi-yaml-val { color: #34D399; }
.osi-code-block .osi-yaml-comment { color: #6B7280; }


/* ==========================================================================
   About Section (Feature Cards)
   ========================================================================== */

.osi-about-section {
  background: var(--osi-ice-blue);
  border-top: 1px solid rgba(0, 147, 199, 0.06);
  border-bottom: 1px solid rgba(0, 147, 199, 0.06);
}

.osi-feature-card {
  background-color: var(--osi-white) !important;
  border: 1px solid var(--osi-gray-200) !important;
  border-radius: 1rem;
  transition: all 0.3s ease;
}

.osi-feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
  border-color: var(--osi-primary-blue) !important;
}

.osi-feature-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.osi-feature-icon--blue {
  background: var(--osi-light-blue);
  color: var(--osi-primary-blue);
}

.osi-feature-icon--purple {
  background: var(--osi-light-purple);
  color: var(--osi-accent-purple);
}

.osi-feature-icon--green {
  background: var(--osi-light-green);
  color: var(--osi-accent-green);
}

.osi-feature-card h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--osi-gray-900);
}

.osi-feature-card p {
  color: var(--osi-gray-500);
  font-size: 0.78rem;
  line-height: 1.6;
}


/* ==========================================================================
   Challenge / Solution Pitch Cards
   ========================================================================== */

.osi-pitch-card {
  border: 1px solid var(--osi-gray-200);
  border-radius: 0.75rem;
  padding: 1.5rem;
  height: 100%;
}

.osi-pitch-card--challenge {
  background: var(--osi-white);
  border-left: 3px solid #EF4444;
}

.osi-pitch-card--solution {
  background: var(--osi-white);
  border-left: 3px solid var(--osi-accent-green);
}

.osi-pitch-card__heading {
  font-size: 0.9rem !important;
  font-weight: 700;
  color: var(--osi-gray-900);
  margin-bottom: 1rem !important;
}

.osi-pitch-card__sub {
  font-weight: 400;
  color: var(--osi-gray-500);
  margin-left: 0.25rem;
}

.osi-pitch-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.osi-pitch-list__item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
  font-size: 0.78rem;
  color: var(--osi-gray-700);
}

.osi-pitch-list__item strong {
  display: block;
  font-size: 0.78rem;
  color: var(--osi-gray-900);
}

.osi-pitch-list__desc {
  color: var(--osi-gray-500);
  font-size: 0.72rem;
}

.osi-pitch-list__icon {
  flex-shrink: 0;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-weight: 700;
  margin-top: 0.1rem;
}

.osi-pitch-list__icon--problem {
  background: #FEE2E2;
  color: #EF4444;
}

.osi-pitch-list__icon--solution {
  background: var(--osi-light-green);
  color: var(--osi-accent-green);
}


/* ==========================================================================
   Core Classes Cards
   ========================================================================== */

.osi-class-card {
  background: var(--osi-white);
  border: 1px solid var(--osi-gray-200);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  transition: all 0.2s ease;
}

.osi-class-card:hover {
  border-color: rgba(0, 147, 199, 0.3);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.osi-class-card__name {
  font-size: 0.8rem;
  color: var(--osi-gray-900);
}

.osi-class-card__desc {
  font-size: 0.72rem;
  color: var(--osi-gray-500);
  margin: 0.25rem 0 0;
  line-height: 1.5;
}


/* ==========================================================================
   Members Section (Logo Wall)
   ========================================================================== */

.osi-members-section {
  background: var(--osi-gray-50);
  border-top: 1px solid var(--osi-gray-100);
  border-bottom: 1px solid var(--osi-gray-100);
  position: relative;
}

.osi-members-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, var(--osi-gray-200) 1px, transparent 0);
  background-size: 28px 28px;
  opacity: 0.4;
  pointer-events: none;
}

.osi-member-card {
  border: 1px solid var(--osi-gray-200) !important;
  border-radius: 0.75rem;
  transition: all 0.3s ease;
  min-height: 120px;
  background: var(--osi-white) !important;
}

.osi-member-card__logo {
  max-width: 120px;
  max-height: 60px;
  width: auto;
  height: auto;
  object-fit: contain;
  transition: all 0.3s ease;
}

.osi-member-card:hover {
  border-color: rgba(0, 147, 199, 0.4) !important;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 147, 199, 0.1);
}

.osi-member-card:hover .osi-member-card__logo {
  transform: scale(1.05);
}

.osi-member-card__name {
  font-size: 0.7rem;
  color: var(--osi-gray-600);
}


/* ==========================================================================
   Working Group Cards
   ========================================================================== */

.osi-wg-card {
  background: var(--osi-white);
  border: 1px solid var(--osi-gray-200);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  transition: all 0.2s ease;
  height: 100%;
}

.osi-wg-card:hover {
  border-color: rgba(0, 147, 199, 0.3);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.osi-wg-card__name {
  font-size: 0.78rem;
  color: var(--osi-gray-900);
  display: block;
  margin-bottom: 0.2rem;
}

.osi-wg-card__focus {
  font-size: 0.72rem;
  color: var(--osi-gray-500);
  margin: 0;
  line-height: 1.5;
}


/* ==========================================================================
   Community Bar (Get Involved)
   ========================================================================== */

.osi-community-bar {
  background: var(--osi-white);
  border: 1px solid var(--osi-gray-200);
  border-radius: 0.75rem;
  padding: 1.5rem 2rem;
}

.osi-community-bar__heading {
  font-size: 0.95rem !important;
  font-weight: 700;
  color: var(--osi-gray-900);
  margin-bottom: 0.3rem !important;
}

.osi-community-bar__desc {
  font-size: 0.75rem;
  color: var(--osi-gray-500);
  margin: 0;
  line-height: 1.5;
}

.osi-community-link {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  background: var(--osi-gray-50);
  border: 1px solid var(--osi-gray-200);
  border-radius: 0.5rem;
  padding: 0.75rem 1.25rem;
  flex: 1;
  min-width: 200px;
  transition: all 0.2s ease;
  text-decoration: none !important;
}

.osi-community-link:hover {
  border-color: var(--osi-primary-blue);
  background: var(--osi-light-blue);
  transform: translateY(-1px);
}

.osi-community-link strong {
  font-size: 0.78rem;
  color: var(--osi-primary-blue);
}

.osi-community-link span {
  font-size: 0.7rem;
  color: var(--osi-gray-500);
}


/* ==========================================================================
   Updates Section
   ========================================================================== */

.osi-updates-section {
  background: var(--osi-white);
  border-bottom: 1px solid var(--osi-gray-100);
}

.osi-update-card {
  background-color: var(--osi-white) !important;
  border: 1px solid var(--osi-gray-200) !important;
  border-left: 4px solid var(--osi-primary-blue) !important;
  border-radius: 0.75rem;
  transition: all 0.3s ease;
}

.osi-update-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.osi-update-card .card-body {
  padding: 0.75rem 1rem;
}

.osi-update-card__date {
  display: block;
  font-size: 0.68rem;
  color: var(--osi-gray-400);
  margin-bottom: 0.2rem;
  font-weight: 500;
}

.osi-update-card h4 {
  font-size: 0.82rem;
  margin-bottom: 0.25rem;
}

.osi-update-card p {
  line-height: 1.4;
  font-size: 0.72rem;
  color: var(--osi-gray-600);
  margin-bottom: 0;
}

.osi-update-card__title {
  color: var(--osi-gray-900);
  font-weight: 600;
  transition: color 0.15s ease;
}

.osi-update-card__title:hover {
  color: var(--osi-primary-blue);
}

.osi-update-card--all {
  background-color: var(--osi-light-blue) !important;
  border-left: 4px solid var(--osi-primary-blue) !important;
  border-color: transparent !important;
  border-left-color: var(--osi-primary-blue) !important;
}

.osi-update-card--all:hover {
  background-color: var(--osi-light-blue) !important;
}

.osi-update-card__all-label {
  color: var(--osi-primary-blue);
  font-size: 0.85rem;
  font-weight: 600;
  transition: color 0.15s ease;
}


/* ==========================================================================
   Get Involved Section (CTA)
   ========================================================================== */

.osi-get-involved {
  background: linear-gradient(135deg, var(--osi-dark-blue) 0%, #1E3A5F 50%, #0E2A4A 100%);
  color: var(--osi-white);
  position: relative;
  overflow: hidden;
}

.osi-get-involved::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.04) 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
}

.osi-get-involved h2 {
  color: var(--osi-white);
}

.osi-get-involved h3 {
  color: var(--osi-white);
}

.osi-involvement-card {
  background-color: rgba(255, 255, 255, 0.08) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  border-radius: 1rem;
  backdrop-filter: blur(4px);
  transition: all 0.3s ease;
}

.osi-involvement-card:hover {
  background-color: rgba(255, 255, 255, 0.12) !important;
  border-color: rgba(255, 255, 255, 0.2) !important;
  transform: translateY(-2px);
}

.osi-involvement-card p {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.8);
}

.osi-get-involved a {
  color: #60A5FA;
  font-weight: 600;
  transition: color 0.15s ease;
}

.osi-get-involved a:hover {
  color: #93C5FD;
}

.osi-get-involved .osi-involvement-card a {
  color: #60A5FA;
  border-bottom: none;
}

.osi-get-involved .osi-involvement-card a:hover {
  color: #93C5FD;
}

.osi-join-btn {
  display: inline-block;
  background: var(--osi-white);
  color: var(--osi-dark-blue);
  padding: 0.5rem 1.5rem;
  border-radius: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  transition: all 0.2s ease;
}

.osi-join-btn:hover {
  background: var(--osi-gray-100);
  color: var(--osi-dark-blue);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}


/* ==========================================================================
   Section heading styles
   ========================================================================== */

.osi-section-heading {
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-weight: 700;
  color: var(--osi-gray-900);
  letter-spacing: -0.02em;
}

.osi-section-subtitle {
  color: var(--osi-gray-500);
  font-size: 0.8rem;
  line-height: 1.6;
}