/* =========================================
   Intel Sustainability — Project 3
   style.css
   ========================================= */

:root {
  --intel-blue: #0071c5;
  --intel-blue-dark: #004d87;
  --intel-blue-light: #e8f4fd;
  --intel-white: #ffffff;
  --intel-gray: #f5f5f5;
  --intel-text: #1a1a1a;
  --intel-muted: #5a5a5a;
  --card-shadow: 0 2px 12px rgba(0,0,0,0.1);
  --transition: 0.3s ease;
}

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

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  color: var(--intel-text);
  background-color: var(--intel-white);
  margin: 0;
  padding: 0;
}

/* Language Toggle Bar */
.lang-toggle-bar {
  background-color: var(--intel-blue-dark);
  text-align: end;
  padding: 0.4rem 1rem;
}

/* Header */
.site-header {
  background-color: var(--intel-blue);
  color: var(--intel-white);
  padding: 3rem 1.5rem;
  text-align: center;
}

.header-logo {
  width: 120px;
  height: auto;
  margin-bottom: 1.5rem;
  filter: brightness(0) invert(1);
}

.site-header h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--intel-white);
}

.header-subtitle {
  font-size: 1.1rem;
  max-width: 680px;
  margin: 0 auto;
  opacity: 0.92;
  color: var(--intel-white);
}

/* Timeline Section */
.timeline-section {
  background-color: var(--intel-gray);
  padding: 2.5rem 1rem;
}

.timeline-scroll {
  display: flex;
  flex-direction: row;
  gap: 1.25rem;
  overflow-x: auto;
  padding: 0.5rem 0.5rem 1rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

[dir="rtl"] .timeline-scroll {
  flex-direction: row-reverse;
}

.timeline-card {
  background-color: var(--intel-white);
  border-radius: 8px;
  padding: 1.25rem;
  min-width: 240px;
  max-width: 260px;
  flex-shrink: 0;
  scroll-snap-align: start;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  text-align: start;
}

.timeline-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 24px rgba(0,113,197,0.2);
}

.card-year {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--intel-blue);
  margin-bottom: 0.25rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--intel-text);
  margin-bottom: 0.75rem;
}

.card-img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.scroll-hint { font-size: 0.875rem; }

/* Pillars 3-Column Section */
.pillars-section { background-color: var(--intel-white); }

.section-heading {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--intel-text);
}

.pillar-card {
  background-color: var(--intel-gray);
  border-radius: 8px;
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
  text-align: start;
}

.pillar-card:hover { transform: translateY(-4px); }

.pillar-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--intel-blue);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pillar-title .bi { font-size: 1.4rem; }

.pillar-card p {
  flex-grow: 1;
  color: var(--intel-text);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.learn-more-btn {
  display: inline-block;
  color: var(--intel-blue);
  border: 2px solid var(--intel-blue);
  border-radius: 4px;
  padding: 0.45rem 1.2rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition);
  align-self: flex-start;
  background-color: transparent;
}

.learn-more-btn:hover,
.learn-more-btn:focus {
  background-color: var(--intel-blue);
  color: var(--intel-white);
}

[dir="rtl"] .learn-more-btn { align-self: flex-end; }

/* Subscribe Section */
.subscribe-section { background-color: var(--intel-blue-light); }

.subscribe-box {
  max-width: 680px;
  margin: 0 auto;
}

.subscribe-box h2 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: var(--intel-blue);
  margin-bottom: 0.5rem;
}

.subscribe-desc {
  color: var(--intel-muted);
  margin-bottom: 1.5rem;
}

.subscribe-form .form-control {
  border: 2px solid var(--intel-blue);
  border-radius: 4px;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  color: var(--intel-text);
}

.subscribe-form .form-control:focus {
  border-color: var(--intel-blue-dark);
  box-shadow: 0 0 0 3px rgba(0,113,197,0.25);
  outline: none;
}

.subscribe-btn {
  background-color: var(--intel-blue);
  color: var(--intel-white);
  font-weight: 600;
  border: 2px solid var(--intel-blue);
  border-radius: 4px;
  padding: 0.6rem 1.5rem;
  transition: background-color var(--transition);
}

.subscribe-btn:hover,
.subscribe-btn:focus {
  background-color: var(--intel-blue-dark);
  border-color: var(--intel-blue-dark);
  color: var(--intel-white);
}

/* Footer */
.site-footer {
  background-color: var(--intel-blue-dark);
  color: rgba(255,255,255,0.9);
  font-size: 0.875rem;
}

.footer-link {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-link:hover,
.footer-link:focus {
  color: var(--intel-white);
  text-decoration: underline;
}

.footer-sep {
  margin: 0 0.4rem;
  opacity: 0.5;
}

/* RTL Global Adjustments */
[dir="rtl"] body { text-align: right; }
[dir="rtl"] .timeline-card,
[dir="rtl"] .pillar-card { text-align: right; }
[dir="rtl"] .pillar-title { flex-direction: row-reverse; }
[dir="rtl"] .subscribe-form .form-text { text-align: right; }

/* Responsive */
@media (max-width: 767px) {
  .timeline-card { min-width: 200px; }
  .lang-toggle-bar { text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}