/* ===================================================================
   Scientific Research Skills — page styles
   Loaded after project-page.css; only overrides via .srs-page namespace
   =================================================================== */

.srs-page {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft Yahei", sans-serif;
  color: #1f2937;
  line-height: 1.6;
}

.srs-page * {
  box-sizing: border-box;
}

/* ============== HERO ============== */
.srs-hero {
  text-align: center;
  padding: 70px 20px 50px;
  background: linear-gradient(135deg, #f8fafc 0%, #eff6ff 50%, #ecfeff 100%);
  border-radius: 18px;
  margin-bottom: 50px;
  border: 1px solid #e2e8f0;
}

.srs-hero-badge {
  display: inline-block;
  font-size: 0.78em;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #475569;
  background: #fff;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid #cbd5e1;
  margin-bottom: 20px;
  font-weight: 600;
}

.srs-hero-title {
  font-size: 2.6em;
  margin: 0 0 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #0f172a;
}

.srs-emoji {
  display: inline-block;
  margin-right: 6px;
}

.srs-hero-tagline {
  font-size: 1.1em;
  color: #475569;
  max-width: 720px;
  margin: 0 auto 28px;
}

.srs-hero-tagline em {
  color: #1e40af;
  font-style: normal;
  font-weight: 500;
}

.srs-hero-stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
  align-items: center;
}

.srs-stat {
  background: #fff;
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  font-size: 0.92em;
  color: #334155;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

a.srs-stat:hover {
  border-color: #3b82f6;
  color: #1e40af;
}

.srs-stat img {
  height: 20px;
  display: block;
}

.srs-hero-cta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.srs-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95em;
  text-decoration: none !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  border: 1.5px solid transparent;
}

.srs-btn-primary {
  background: #1e40af;
  color: #fff !important;
}

.srs-btn-primary:hover {
  background: #1e3a8a;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(30, 64, 175, 0.25);
}

.srs-btn-ghost {
  background: #fff;
  color: #1e40af !important;
  border-color: #cbd5e1;
}

.srs-btn-ghost:hover {
  border-color: #1e40af;
  transform: translateY(-1px);
}

/* ============== PHILOSOPHY ============== */
.srs-philosophy {
  background: #fffbeb;
  border-left: 5px solid #f59e0b;
  padding: 26px 30px;
  border-radius: 0 14px 14px 0;
  margin-bottom: 60px;
}

.srs-pull-quote {
  font-size: 1.08em;
  color: #57360e;
  margin-bottom: 22px;
  line-height: 1.65;
}

.srs-pull-quote i.fa-quote-left {
  color: #f59e0b;
  font-size: 1.3em;
  margin-right: 8px;
  vertical-align: top;
}

.srs-pull-quote strong {
  color: #92400e;
}

.srs-principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px 22px;
}

.srs-principle {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95em;
  color: #57360e;
}

.srs-principle i {
  color: #d97706;
  width: 22px;
  text-align: center;
}

.srs-principle strong {
  color: #1f2937;
}

/* ============== SECTION ============== */
.srs-section {
  margin-bottom: 70px;
}

.srs-section-title {
  font-size: 1.85em;
  font-weight: 700;
  color: #0f172a;
  margin: 0 0 8px;
  padding-bottom: 12px;
  border-bottom: 3px solid #1e40af;
  display: inline-block;
}

.srs-section-title i {
  color: #1e40af;
  margin-right: 10px;
}

.srs-section-sub {
  color: #64748b;
  font-size: 0.98em;
  margin: 0 0 28px;
}

/* ============== TAGS ============== */
.srs-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78em;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.srs-tag-tool {
  background: #fef3c7;
  color: #92400e;
}

.srs-tag-method {
  background: #dcfce7;
  color: #14532d;
}

/* ============== SKILLS GRID ============== */
.srs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 22px;
}

.srs-card {
  display: block;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  padding: 22px 22px 18px;
  text-decoration: none !important;
  color: inherit !important;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s;
  position: relative;
  overflow: hidden;
}

.srs-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, #3b82f6, #8b5cf6);
  opacity: 0;
  transition: opacity 0.18s;
}

.srs-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
  border-color: #cbd5e1;
}

.srs-card:hover::before {
  opacity: 1;
}

.srs-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.srs-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2em;
}

.srs-card-title {
  font-family: ui-monospace, "SF Mono", "Menlo", monospace;
  font-size: 1.12em;
  margin: 0 0 10px;
  color: #0f172a;
  font-weight: 700;
}

.srs-card-desc {
  font-size: 0.93em;
  color: #475569;
  margin: 0 0 14px;
  line-height: 1.55;
  min-height: 64px;
}

.srs-card-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-top: 1px dashed #e2e8f0;
  padding-top: 12px;
}

.srs-chip {
  font-size: 0.74em;
  background: #f1f5f9;
  color: #475569;
  padding: 3px 9px;
  border-radius: 6px;
  font-weight: 500;
}

/* ============== WORKFLOW DIAGRAM ============== */
.srs-flow-wrap {
  background: #fafbfc;
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  padding: 24px;
}

.srs-flow {
  width: 100%;
  height: auto;
  display: block;
  max-width: 1100px;
  margin: 0 auto;
}

.srs-stage-label {
  font-size: 14px;
  font-weight: 700;
  fill: #475569;
  letter-spacing: 0.08em;
}

.srs-node-title {
  font-size: 14px;
  font-weight: 700;
  fill: #0f172a;
  text-anchor: middle;
  font-family: ui-monospace, "SF Mono", "Menlo", monospace;
}

.srs-node-sub {
  font-size: 11.5px;
  fill: #64748b;
  text-anchor: middle;
}

.srs-node rect {
  transition: filter 0.15s ease;
}

.srs-node:hover rect {
  filter: drop-shadow(0 4px 10px rgba(15, 23, 42, 0.18));
}

.srs-edge-label {
  font-size: 11px;
  fill: #94a3b8;
  text-anchor: middle;
  font-style: italic;
}

.srs-flow-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
  margin-top: 18px;
  font-size: 0.88em;
  color: #475569;
}

.srs-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  margin-right: 6px;
  vertical-align: middle;
}

/* ============== INSTALL TABS ============== */
.srs-tabs {
  background: #0f172a;
  border-radius: 14px;
  overflow: hidden;
}

.srs-tabbar {
  display: flex;
  background: #1e293b;
}

.srs-tab {
  flex: 1;
  padding: 14px;
  background: transparent;
  border: none;
  color: #94a3b8;
  font-size: 0.95em;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  border-bottom: 3px solid transparent;
}

.srs-tab:hover {
  color: #e2e8f0;
}

.srs-tab.is-active {
  color: #fff;
  background: #0f172a;
  border-bottom-color: #3b82f6;
}

.srs-code {
  display: none;
  margin: 0;
  padding: 22px 26px;
  color: #e2e8f0;
  background: #0f172a;
  font-family: ui-monospace, "SF Mono", "Menlo", monospace;
  font-size: 0.92em;
  line-height: 1.7;
  white-space: pre;
  overflow-x: auto;
}

.srs-code.is-active {
  display: block;
}

.srs-code code {
  background: transparent !important;
  color: inherit;
  padding: 0;
}

/* ============== TABLE ============== */
.srs-table-wrap {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
}

.srs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94em;
  background: #fff;
}

.srs-table th,
.srs-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: top;
}

.srs-table thead th {
  background: #f8fafc;
  color: #1e293b;
  font-weight: 700;
  font-size: 0.86em;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.srs-table tbody tr:last-child td {
  border-bottom: none;
}

.srs-table tbody tr:hover {
  background: #f8fafc;
}

.srs-table code {
  background: #f1f5f9;
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 0.92em;
  color: #1e40af;
}

.srs-pill {
  display: inline-block;
  font-size: 0.78em;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
}

.srs-pill-required {
  background: #fee2e2;
  color: #991b1b;
}

.srs-pill-recommend {
  background: #dbeafe;
  color: #1e40af;
}

.srs-pill-optional {
  background: #f1f5f9;
  color: #475569;
}

.srs-pill-none {
  background: #dcfce7;
  color: #14532d;
}

/* ============== CALLOUT ============== */
.srs-callout {
  margin-top: 22px;
  display: flex;
  gap: 14px;
  background: #eff6ff;
  border-left: 4px solid #3b82f6;
  padding: 16px 20px;
  border-radius: 0 10px 10px 0;
  color: #1e3a8a;
  font-size: 0.94em;
  line-height: 1.6;
}

.srs-callout i {
  font-size: 1.3em;
  margin-top: 2px;
  color: #2563eb;
}

.srs-callout code {
  background: rgba(37, 99, 235, 0.1);
  padding: 1px 6px;
  border-radius: 4px;
}

/* ============== FOOTER CARD ============== */
.srs-footer-section {
  margin-bottom: 30px;
}

.srs-footer-card {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #e2e8f0;
  padding: 36px 40px;
  border-radius: 16px;
  text-align: center;
}

.srs-footer-card h3 {
  color: #fff;
  margin: 0 0 14px;
  font-size: 1.4em;
}

.srs-footer-card h3 i {
  color: #60a5fa;
  margin-right: 8px;
}

.srs-footer-card p {
  color: #cbd5e1;
  max-width: 720px;
  margin: 0 auto 22px;
  line-height: 1.65;
}

.srs-footer-card code {
  background: rgba(255, 255, 255, 0.08);
  padding: 1px 6px;
  border-radius: 4px;
  color: #93c5fd;
}

.srs-footer-card .srs-btn {
  margin: 6px;
}

.srs-footer-card .srs-btn-ghost {
  background: transparent;
  color: #fff !important;
  border-color: rgba(255, 255, 255, 0.3);
}

.srs-footer-card .srs-btn-ghost:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

/* ============== MOBILE ============== */
@media (max-width: 768px) {
  .srs-hero {
    padding: 50px 16px 35px;
  }

  .srs-hero-title {
    font-size: 1.9em;
  }

  .srs-hero-tagline {
    font-size: 1em;
  }

  .srs-section-title {
    font-size: 1.45em;
  }

  .srs-philosophy {
    padding: 20px 18px;
  }

  .srs-card-desc {
    min-height: auto;
  }

  .srs-tab {
    font-size: 0.86em;
    padding: 12px 8px;
  }

  .srs-code {
    font-size: 0.82em;
    padding: 18px;
  }

  .srs-flow-wrap {
    padding: 14px;
  }
}

/* ==========================================================================
   HERO VIDEO BACKGROUND (Remotion-rendered)
   ========================================================================== */
.srs-hero--video {
  position: relative;
  padding: 0;
  background: #0f172a;
  overflow: hidden;
  border: 1px solid #1e293b;
}

.srs-hero-video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1600 / 480;
  overflow: hidden;
}

.srs-hero-video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.srs-hero-video-fade {
  position: absolute;
  inset: auto 0 0 0;
  height: 60px;
  background: linear-gradient(to bottom, transparent 0%, #0f172a 100%);
  pointer-events: none;
}

.srs-hero-overlay {
  background: #0f172a;
  padding: 4px 28px 36px;
  text-align: center;
  color: #e2e8f0;
}

.srs-hero--video .srs-hero-tagline {
  color: #cbd5e1;
  margin: 8px auto 22px;
  max-width: 760px;
}

.srs-hero--video .srs-hero-tagline em {
  color: #93c5fd;
}

.srs-hero--video .srs-stat {
  background: #1e293b;
  border-color: #334155;
  color: #cbd5e1;
}

.srs-hero--video a.srs-stat:hover {
  border-color: #60a5fa;
  color: #93c5fd;
}

.srs-hero--video .srs-btn-ghost {
  background: transparent;
  color: #93c5fd !important;
  border-color: #334155;
}

.srs-hero--video .srs-btn-ghost:hover {
  border-color: #60a5fa;
  background: rgba(59, 130, 246, 0.08);
}

/* Respect prefers-reduced-motion (no video anymore, but keep cleanup) */
@media (prefers-reduced-motion: reduce) {
  .srs-fadeup,
  .srs-fadeup-stagger > * {
    transition: none !important;
  }
}

/* ==========================================================================
   SCROLL FADE-IN — modest motion using IntersectionObserver hook
   ========================================================================== */
.srs-fadeup {
  opacity: 0;
  transform: translateY(48px) scale(0.985);
  filter: blur(2px);
  transition: opacity 0.85s cubic-bezier(0.22, 0.7, 0.25, 1),
              transform 0.85s cubic-bezier(0.22, 0.7, 0.25, 1),
              filter 0.85s ease;
}

.srs-fadeup.is-visible {
  opacity: 1;
  transform: none;
  filter: none;
}

.srs-fadeup-stagger > * {
  opacity: 0;
  transform: translateY(40px) scale(0.96);
  filter: blur(1.5px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.7, 0.25, 1),
              transform 0.7s cubic-bezier(0.22, 0.7, 0.25, 1),
              filter 0.7s ease;
}

.srs-fadeup-stagger.is-visible > *:nth-child(1) { transition-delay: 0.00s; opacity: 1; transform: none; filter: none; }
.srs-fadeup-stagger.is-visible > *:nth-child(2) { transition-delay: 0.10s; opacity: 1; transform: none; filter: none; }
.srs-fadeup-stagger.is-visible > *:nth-child(3) { transition-delay: 0.20s; opacity: 1; transform: none; filter: none; }
.srs-fadeup-stagger.is-visible > *:nth-child(4) { transition-delay: 0.30s; opacity: 1; transform: none; filter: none; }
.srs-fadeup-stagger.is-visible > *:nth-child(5) { transition-delay: 0.40s; opacity: 1; transform: none; filter: none; }
.srs-fadeup-stagger.is-visible > *:nth-child(6) { transition-delay: 0.50s; opacity: 1; transform: none; filter: none; }

@media (prefers-reduced-motion: reduce) {
  .srs-fadeup,
  .srs-fadeup-stagger > * {
    opacity: 1;
    transform: none;
    filter: none;
    transition: none;
  }
}

/* ==========================================================================
   STATIC HERO IMAGE — subtle Ken Burns drift so it doesn't feel dead
   ========================================================================== */
img.srs-hero-video {
  animation: srs-hero-breathe 22s ease-in-out infinite alternate;
  transform-origin: center 55%;
}

@keyframes srs-hero-breathe {
  from { transform: scale(1.00); }
  to   { transform: scale(1.045); }
}

@media (prefers-reduced-motion: reduce) {
  img.srs-hero-video { animation: none; }
}