/* ============================================
   Cedar Current Research School
   Production-ready external stylesheet
   ============================================ */

:root {
  --forest: #2d4f3c;
  --forest-light: #3d6650;
  --river: #4a7ba6;
  --river-light: #7eb8da;
  --limestone: #f5f3ee;
  --sand: #d9d5c9;
  --charcoal: #3a3a3a;
  --charcoal-light: #555555;
  --white: #ffffff;

  --font-serif: 'Merriweather', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', 'Helvetica Neue', Arial, sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  --radius: 6px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--charcoal);
  background-color: var(--limestone);
  line-height: 1.65;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
a {
  color: var(--forest);
}
a:hover {
  color: var(--river);
}
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  line-height: 1.2;
  margin: 0 0 var(--space-sm) 0;
}
p {
  margin: 0 0 var(--space-sm) 0;
}
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--forest);
  color: var(--white);
  padding: 0.5rem 1rem;
  z-index: 1000;
  text-decoration: none;
}
.skip-link:focus {
  top: 0;
}

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 243, 238, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(45, 79, 60, 0.1);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--forest);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.site-nav {
  display: flex;
  align-items: center;
}
.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--charcoal);
  transition: color 0.2s;
}
.nav-links a:hover {
  color: var(--forest);
}
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}
.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--forest);
  border-radius: 2px;
  position: relative;
  transition: transform 0.3s, background 0.3s;
}
.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}
.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }
.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}
.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: translateY(-7px) rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  overflow: hidden;
}
.hero-media {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  z-index: 1;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.45) saturate(0.9);
}
.hero-overlay {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  background: linear-gradient(180deg, rgba(45,79,60,0.3) 0%, rgba(58,58,58,0.5) 100%);
  z-index: 2;
}
.flow-lines {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 300px;
  z-index: 3;
  pointer-events: none;
}
.flow-lines path {
  animation: flowDraw 4s linear infinite;
}
.flow-lines path:nth-child(2) {
  animation-duration: 5s;
  animation-direction: reverse;
}
.flow-lines path:nth-child(3) {
  animation-duration: 6s;
}
@keyframes flowDraw {
  to {
    stroke-dashoffset: -30;
  }
}
.hero-content {
  position: relative;
  z-index: 4;
  max-width: var(--max-width);
  width: 100%;
  padding: var(--space-md);
  text-align: left;
}
.hero-content h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  max-width: 18ch;
  margin-bottom: var(--space-sm);
  text-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
.hero-lead {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  max-width: 60ch;
  margin-bottom: var(--space-md);
  color: rgba(245,243,238,0.95);
  font-weight: 300;
}
.cta {
  display: inline-block;
  background: var(--forest);
  color: var(--white);
  padding: 0.85rem 1.75rem;
  text-decoration: none;
  font-weight: 500;
  border-radius: var(--radius);
  transition: background 0.2s, transform 0.2s;
}
.cta:hover {
  background: var(--forest-light);
  color: var(--white);
  transform: translateY(-2px);
}

/* Sections */
.section {
  padding: var(--space-xl) var(--space-md);
}
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.section-header {
  margin-bottom: var(--space-lg);
  max-width: 70ch;
}
.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--forest);
}
.section-subtitle {
  font-size: 1.15rem;
  color: var(--charcoal-light);
  margin-top: 0.5rem;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Approach */
.approach-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}
.approach-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.approach-figure img {
  width: 100%;
}
.drop-cap {
  float: left;
  font-family: var(--font-serif);
  font-size: 3.5rem;
  line-height: 0.8;
  padding-right: 0.5rem;
  color: var(--forest);
}
.lead {
  font-size: 1.15rem;
  font-family: var(--font-serif);
  color: var(--charcoal);
}
.approach-list {
  margin-top: var(--space-sm);
  padding-left: 1.2rem;
}
.approach-list li {
  margin-bottom: var(--space-xs);
  color: var(--charcoal-light);
}

/* Watersheds */
.watersheds {
  background: linear-gradient(180deg, var(--limestone) 0%, #e9e6de 100%);
}
.watershed-map {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}
.watershed-svg {
  width: 100%;
  height: auto;
  display: block;
}
.basin-region {
  fill: rgba(74, 123, 166, 0.12);
  stroke: var(--forest);
  stroke-width: 2;
  transition: fill 0.3s ease, stroke-width 0.3s ease;
  cursor: pointer;
}
.basin-region:hover {
  fill: rgba(74, 123, 166, 0.35);
  stroke-width: 3;
}
.map-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--white);
  border: 1px solid var(--sand);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 0.9rem;
  color: var(--charcoal);
  opacity: 0;
  transition: opacity 0.2s;
  z-index: 10;
  max-width: 260px;
}
.map-tooltip strong {
  display: block;
  color: var(--forest);
  margin-bottom: 0.25rem;
}

/* Learning */
.programs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
}
.program-card {
  background: var(--white);
  border-top: 4px solid var(--river);
  padding: var(--space-md);
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}
.program-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.program-card h3 {
  font-size: 1.25rem;
  color: var(--forest);
  margin-bottom: var(--space-sm);
}
.program-card p {
  flex-grow: 1;
  color: var(--charcoal-light);
  font-size: 0.95rem;
  line-height: 1.6;
}
.program-link {
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: var(--space-sm);
  color: var(--river);
}
.program-link:hover {
  color: var(--forest);
}

/* River Lab */
.river-lab {
  background: #ebe8e1;
}
.field-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}
.field-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 6px rgba(0,0,0,0.04);
  transition: box-shadow 0.3s;
}
.field-card.active {
  box-shadow: var(--shadow);
}
.field-summary {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  cursor: pointer;
}
.field-meta {
  display: grid;
  gap: 0.15rem;
}
.field-id {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--river);
}
.field-meta h3 {
  font-size: 1.15rem;
  color: var(--forest);
  margin: 0;
}
.field-location {
  font-size: 0.9rem;
  color: var(--charcoal-light);
}
.field-status {
  display: inline-block;
  justify-self: start;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--forest);
  background: rgba(45, 79, 60, 0.08);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}
.expand-btn {
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--sand);
  background: transparent;
  border-radius: 50%;
  position: relative;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.expand-btn::before,
.expand-btn::after {
  content: '';
  position: absolute;
  background: var(--forest);
  transition: transform 0.3s;
}
.expand-btn::before {
  width: 12px;
  height: 2px;
  top: calc(50% - 1px);
  left: calc(50% - 6px);
}
.expand-btn::after {
  width: 2px;
  height: 12px;
  top: calc(50% - 6px);
  left: calc(50% - 1px);
}
.field-card.active .expand-btn::after {
  transform: scaleY(0);
}
.field-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease, padding 0.5s ease;
  padding: 0 var(--space-md);
}
.field-card.active .field-details {
  max-height: 400px;
  padding: 0 var(--space-md) var(--space-md);
}
.field-details dl {
  margin: 0;
  display: grid;
  gap: var(--space-sm);
}
.field-details dt {
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--forest);
}
.field-details dd {
  margin: 0;
  color: var(--charcoal-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Flood Simulator */
.flood-simulator {
  max-width: 960px;
  margin: 0 auto;
  background: var(--charcoal);
  color: var(--limestone);
  border-radius: 12px;
  padding: var(--space-lg) var(--space-md);
  overflow: hidden;
}
.simulator-header h3 {
  color: var(--limestone);
  margin-bottom: 0.25rem;
}
.simulator-header p {
  color: rgba(245,243,238,0.65);
  margin-bottom: var(--space-md);
}
.simulator-panel {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-md);
  align-items: center;
  margin-bottom: var(--space-md);
}
.river-stage {
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  padding: var(--space-sm);
}
.river-cross-section {
  position: relative;
  height: 260px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
  border-bottom: 2px solid rgba(245,243,238,0.2);
}
.bank {
  width: 15%;
  height: 100%;
  background: linear-gradient(180deg, #5a5a5a 0%, #4a4a4a 100%);
  border-radius: 4px 4px 0 0;
}
.river-channel {
  position: relative;
  width: 70%;
  height: 40%;
  background: #333;
  align-self: flex-end;
  overflow: hidden;
  border-radius: 8px 8px 0 0;
}
.water {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 38%;
  background: linear-gradient(to top, var(--water-color), rgba(255,255,255,0.1));
  transition: height 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), background 0.6s;
}
.river-bed {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: #222;
}
.gauge-mark {
  position: absolute;
  left: 0;
  width: 100%;
  border-top: 1px dashed rgba(245,243,238,0.25);
  font-size: 0.7rem;
  color: rgba(245,243,238,0.6);
  padding-left: 4px;
}
.simulator-readout {
  display: grid;
  gap: var(--space-sm);
}
.readout-row {
  display: flex;
  justify-content: space-between;
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid rgba(245,243,238,0.1);
}
.readout-row span {
  font-size: 0.85rem;
  color: rgba(245,243,238,0.65);
}
.readout-row strong {
  font-size: 1.1rem;
  color: var(--limestone);
  font-family: var(--font-sans);
}
.simulator-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
}
.simulator-controls button {
  background: rgba(255,255,255,0.1);
  color: var(--limestone);
  border: 1px solid rgba(255,255,255,0.15);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s, border-color 0.2s;
}
.simulator-controls button:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,238,0.3);
}
.slider-wrap {
  flex: 1 1 200px;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.slider-wrap label {
  font-size: 0.85rem;
  color: rgba(245,243,238,0.7);
  white-space: nowrap;
}
#stageSlider {
  width: 100%;
  accent-color: var(--river-light);
  cursor: pointer;
}

/* Visit */
.visit {
  background: var(--limestone);
}
.visit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}
.visit-info .section-header {
  margin-bottom: var(--space-md);
}
.contact-block {
  font-style: normal;
  margin-bottom: var(--space-md);
}
.contact-block p {
  margin-bottom: var(--space-sm);
  color: var(--charcoal-light);
}
.contact-block a {
  text-decoration: none;
  color: var(--river);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.contact-block a:hover {
  border-bottom-color: var(--river);
}
.campus-hours h4 {
  font-size: 1rem;
  font-family: var(--font-sans);
  margin-bottom: 0.5rem;
  color: var(--forest);
}
.visit-figure {
  margin: var(--space-md) 0 0 0;
  border-radius: var(--radius);
  overflow: hidden;
}
.visit-figure img {
  width: 100%;
}
.inquiry-form {
  background: var(--white);
  padding: var(--space-lg);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.inquiry-form h3 {
  color: var(--forest);
  margin-bottom: 0.25rem;
}
.form-lead {
  font-size: 0.95rem;
  color: var(--charcoal-light);
  margin-bottom: var(--space-md);
}
.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-sm);
}
.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: var(--charcoal);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.65rem;
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 1rem;
  background: var(--limestone);
  color: var(--charcoal);
}
.form-group textarea {
  resize: vertical;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: 2px solid var(--river);
  outline-offset: 2px;
  border-color: var(--river);
}
.inquiry-form button[type="submit"] {
  margin-top: var(--space-xs);
  background: var(--forest);
  color: var(--white);
  border: none;
  padding: 0.85rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}
.inquiry-form button[type="submit"]:hover {
  background: var(--forest-light);
  transform: translateY(-1px);
}
.form-status {
  margin-top: var(--space-sm);
  font-size: 0.9rem;
  min-height: 1.4em;
}

/* Footer */
.site-footer {
  background: var(--charcoal);
  color: rgba(245,243,238,0.6);
  padding: var(--space-md);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.9rem;
}
.footer-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-links a {
  color: rgba(245,243,238,0.6);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover {
  color: var(--limestone);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 960px) {
  .approach-layout,
  .simulator-panel,
  .visit-grid {
    grid-template-columns: 1fr;
  }
  .simulator-panel {
    gap: var(--space-lg);
  }
  .hero-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 768px) {
  .section {
    padding: var(--space-lg) var(--space-sm);
  }
  .nav-toggle {
    display: block;
  }
  .nav-links {
    position: fixed;
    top: 0; right: 0; bottom: 0; left: 25%;
    flex-direction: column;
    background: var(--limestone);
    padding: 5rem var(--space-md) var(--space-md);
    transform: translateX(100%);
    transition: transform 0.35s ease;
    z-index: 90;
    gap: var(--space-sm);
    box-shadow: -4px 0 24px rgba(0,0,0,0.08);
    list-style: none;
    margin: 0;
  }
  .nav-links.open {
    transform: translateX(0);
  }
  .nav-links a {
    font-size: 1.1rem;
    padding: 0.5rem 0;
    display: block;
  }
  .field-summary {
    grid-template-columns: 1fr;
  }
  .expand-btn {
    justify-self: start;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
  .flow-lines {
    height: 180px;
  }
}

@media (max-width: 480px) {
  .cta {
    width: 100%;
    text-align: center;
  }
  .simulator-controls button {
    flex: 1 1 auto;
    text-align: center;
  }
  .program-card {
    padding: var(--space-sm);
  }
}