/* ============================================
   USINA HIDRELÉTRICA & RIO TIETÊ
   Estilo: clean, escolar, natureza/água
   Paleta: verde mata + azul rio + creme papel
   ============================================ */

:root {
  --bg: #fafaf6;
  --paper: #ffffff;
  --ink: #1c2a23;
  --ink-soft: #4a5a52;
  --muted: #8a9a92;
  --line: #e5e2d6;
  --accent: #1e6f50;     /* verde mata */
  --accent-dark: #134a36;
  --water: #2a6f97;       /* azul rio */
  --water-soft: #a9c5d9;
  --sand: #efe8d6;
  --sun: #d9a441;
  --shadow: 0 10px 30px -10px rgba(19, 74, 54, .25);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 30px; }

body {
  font-family: 'Manrope', system-ui, Fraunces;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(circle at 80% 10%, rgba(42,111,151,.06), transparent 50%),
    radial-gradient(circle at 10% 90%, rgba(30,111,80,.06), transparent 50%);
  background-attachment: fixed;
}

img { max-width: 100%; display: block; }

/* ============ TOPBAR ============ */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 64px;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px 0 240px;
  z-index: 100;
  transition: padding .3s;
}

.brand {
  font-family: 'Fraunces', serif;
  font-size: 20px;
  font-weight: 600;
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: .3px;
}
.brand i { color: var(--water); }

.flags {
  display: flex;
  gap: 8px;
  align-items: center;
}

.flag-btn {
  background: transparent;
  border: 2px solid transparent;
  padding: 4px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all .2s ease;
  opacity: .6;
}
.flag-btn:hover { opacity: 1; transform: translateY(-2px); }
.flag-btn.active {
  opacity: 1;
  border-color: var(--accent);
  background: rgba(30,111,80,.08);
}
.flag-btn svg {
  border-radius: 4px;
  box-shadow: 0 2px 6px rgba(0,0,0,.15);
  display: block;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  font-size: 22px;
  color: var(--ink);
  cursor: pointer;
}

/* ============ SIDEBAR ============ */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: 220px;
  height: 100vh;
  background: var(--paper);
  border-right: 1px solid var(--line);
  padding: 90px 16px 30px;
  overflow-y: auto;
  z-index: 90;
  transition: transform .3s;
}

.sidebar nav { display: flex; flex-direction: column; gap: 4px; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 14px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-radius: 10px;
  border-left: 3px solid transparent;
  transition: all .25s ease;
  position: relative;
}
.nav-item i {
  width: 18px; text-align: center;
  color: var(--muted);
  font-size: 15px;
  transition: color .25s ease;
}
.nav-item:hover {
  background: rgba(30,111,80,.06);
  color: var(--ink);
}
.nav-item:hover i { color: var(--accent); }
.nav-item.active {
  background: rgba(30,111,80,.10);
  color: var(--accent-dark);
  border-left-color: var(--accent);
  font-weight: 600;
}
.nav-item.active i { color: var(--accent); }

/* ============ CONTENT ============ */
.content {
  margin-left: 220px;
  padding: 90px 60px 30px;
  max-width: 1100px;
}

.section {
  padding: 60px 0 80px;
  border-bottom: 1px dashed var(--line);
}
.section:last-of-type { border-bottom: none; }

.section-head { margin-bottom: 36px; }
.section-num {
  display: inline-block;
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 16px;
  color: var(--accent);
  letter-spacing: 4px;
  margin-bottom: 6px;
}
.section h2 {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.05;
  color: var(--ink);
  letter-spacing: -.5px;
  margin-bottom: 8px;
}
.section-sub {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 620px;
}

.section h3 {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: 26px;
  color: var(--accent-dark);
  margin: 28px 0 12px;
  letter-spacing: -.2px;
}
.section h4 {
  font-family: 'Manrope', Fraunces;
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--ink);
}
.section p {
  margin: 0 0 16px;
  color: var(--ink-soft);
  font-size: 16.5px;
}

/* ============ HERO / CAPA ============ */
.section-hero {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 60px;
  align-items: center;
  min-height: calc(100vh - 90px);
  padding: 30px 0 60px;
  border: none;
}

.eyebrow {
  display: inline-block;
  font-family: 'Manrope', Fraunces;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(30,111,80,.08);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero-title {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: clamp(48px, 7vw, 84px);
  line-height: 1;
  letter-spacing: -2px;
  color: var(--ink);
  margin-bottom: 24px;
}
.hero-title em {
  display: block;
  font-style: italic;
  font-weight: 500;
  color: var(--water);
}

.hero-sub {
  font-size: 19px;
  color: var(--ink-soft);
  max-width: 520px;
  margin-bottom: 40px;
}

.students { margin-bottom: 40px; }
.students-title {
  font-family: 'Manrope', Fraunces !important;
  font-size: 12px !important;
  font-weight: 700 !important;
  letter-spacing: 3px !important;
  text-transform: uppercase;
  color: var(--muted) !important;
  margin-bottom: 14px !important;
}

.students-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.student-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all .25s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,.02);
}
.student-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.student-num {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 22px;
  color: var(--water);
  font-weight: 600;
}
.student-card p {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  margin: 0;
  line-height: 1.3;
}

.serie-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-dark);
  color: #fff;
  padding: 10px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--ink);
  color: #fff;
  padding: 16px 28px;
  border-radius: 100px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: .5px;
  transition: all .3s ease;
}
.cta:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -10px rgba(30,111,80,.5);
}
.cta i { transition: transform .3s; }
.cta:hover i { transform: translateY(3px); }

.hero-image {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  aspect-ratio: 4/5;
  box-shadow: var(--shadow);
}
.hero-image img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-image::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(19,74,54,.2), transparent 50%);
}

/* ============ GRID 2 COLUNAS ============ */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin: 24px 0 32px;
}
.grid-2.reverse > :first-child { order: 2; }

.figure {
  border-radius: 18px;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.figure img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.figure figcaption {
  padding: 14px 18px;
  font-size: 13px;
  color: var(--ink-soft);
  font-style: italic;
  background: var(--paper);
  border-top: 1px solid var(--line);
}
.figure-chart img {
  aspect-ratio: auto;
  object-fit: contain;
  background: #fff;
  padding: 30px 20px;
  max-height: 480px;
}

/* ============ INFO CARD (substitui figura quando não há foto) ============ */
.info-card {
  background: linear-gradient(160deg, rgba(30,111,80,.08), rgba(42,111,151,.04));
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
}
.info-card.info-card-leaf {
  background: linear-gradient(160deg, rgba(30,111,80,.10), rgba(217,164,65,.05));
}
.info-card-icon {
  font-size: 32px;
  color: var(--accent);
  margin-bottom: 16px;
  display: inline-block;
}
.info-card h4 {
  font-family: 'Fraunces', serif !important;
  font-size: 28px !important;
  font-weight: 600 !important;
  color: var(--accent-dark) !important;
  margin: 18px 0 6px !important;
  letter-spacing: -.3px;
}
.info-card h4:first-of-type { margin-top: 0 !important; }
.info-card p {
  font-size: 15px !important;
  margin: 0 !important;
  color: var(--ink-soft) !important;
}

/* ============ CHARTS GRID (3 gráficos lado a lado) ============ */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 30px 0;
}
.charts-grid .figure-chart img {
  max-height: 340px;
  padding: 20px 16px;
}

/* ============ TIMELINE ============ */
.timeline {
  position: relative;
  margin: 24px 0;
  padding-left: 30px;
  border-left: 2px solid var(--line);
}
.tl-item {
  position: relative;
  padding: 6px 0 22px 18px;
}
.tl-item::before {
  content: '';
  position: absolute;
  left: -38px;
  top: 12px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
}
.tl-year {
  display: inline-block;
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 22px;
  font-weight: 600;
  color: var(--water);
  margin-bottom: 4px;
}
.tl-item p { margin: 0; }

/* ============ DATA TABLE ============ */
.data-table {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  margin: 20px 0;
}
.data-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
}
.data-row:last-child { border-bottom: none; }
.data-row span {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--muted);
  font-weight: 600;
}
.data-row strong {
  font-family: 'Fraunces', serif;
  font-size: 19px;
  font-weight: 600;
  color: var(--accent-dark);
}

/* ============ CYCLE CARDS ============ */
.cycle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.cycle-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px 20px;
  text-align: center;
  transition: all .3s ease;
}
.cycle-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--water);
}
.cycle-card i {
  font-size: 32px;
  color: var(--water);
  margin-bottom: 12px;
  display: inline-block;
}
.cycle-card h4 {
  font-family: 'Fraunces', serif !important;
  font-size: 22px !important;
  color: var(--accent-dark) !important;
  margin-bottom: 8px !important;
}
.cycle-card p {
  font-size: 14px;
  line-height: 1.5;
  margin: 0;
}

/* ============ RELAÇÕES ECOLÓGICAS ============ */
.rel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin: 20px 0;
}
.rel-card {
  background: linear-gradient(180deg, rgba(30,111,80,.04), transparent);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  transition: all .25s ease;
}
.rel-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.rel-card h4 {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent-dark);
  margin-bottom: 8px;
}
.rel-card h4 i { color: var(--accent); }
.rel-card p { font-size: 14.5px; margin: 0; }

/* ============ STATS ============ */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin: 28px 0;
}
.stat {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px 18px;
  text-align: center;
}
.stat strong {
  display: block;
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: 48px;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: -1px;
}
.stat span {
  font-size: 13px;
  color: var(--ink-soft);
  font-weight: 500;
}

/* ============ QUOTE ============ */
.quote {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  color: #fff;
  border-radius: 20px;
  padding: 40px 44px;
  margin: 30px 0;
  position: relative;
}
.quote i {
  font-size: 32px;
  opacity: .4;
  margin-bottom: 14px;
  display: block;
}
.quote p {
  font-family: 'Fraunces', serif;
  font-size: 24px;
  font-style: italic;
  line-height: 1.4;
  color: #fff !important;
  margin: 0 !important;
}

/* ============ BULLETS ============ */
.bullets {
  list-style: none;
  margin: 20px 0;
}
.bullets li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 16px;
}
.bullets li:last-child { border-bottom: none; }
.bullets li i {
  color: var(--water);
  margin-top: 5px;
  width: 18px;
  text-align: center;
}

/* ============ CLOSING ============ */
.closing {
  margin-top: 50px;
  text-align: center;
  padding: 50px 30px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 24px;
}
.closing > p:first-child {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 34px;
  color: var(--accent-dark);
  margin-bottom: 24px;
}
.closing-students {
  font-size: 15px !important;
  color: var(--ink) !important;
  font-weight: 500 !important;
  margin-bottom: 12px !important;
  line-height: 1.8;
}
.closing-serie {
  display: inline-block;
  font-size: 12px !important;
  font-weight: 700 !important;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent) !important;
  background: rgba(30,111,80,.08);
  padding: 6px 16px;
  border-radius: 100px;
  margin: 0 !important;
}

/* ============ FOOTER ============ */
.footer {
  padding: 30px 0;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
  margin-top: 30px;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 980px) {
  .menu-toggle { display: block; }
  .topbar { padding: 0 20px; }
  .sidebar {
    transform: translateX(-100%);
    width: 240px;
    box-shadow: 30px 0 60px -10px rgba(0,0,0,.15);
  }
  .sidebar.open { transform: translateX(0); }
  .content { margin-left: 0; padding: 90px 24px 30px; }
  .section-hero { grid-template-columns: 1fr; gap: 40px; min-height: auto; padding: 30px 0; }
  .hero-image { aspect-ratio: 4/3; max-width: 100%; }
  .grid-2 { grid-template-columns: 1fr; gap: 24px; }
  .grid-2.reverse > :first-child { order: 0; }
  .hero-title { font-size: 48px; }
}

@media (max-width: 520px) {
  .content { padding: 80px 18px 24px; }
  .section { padding: 40px 0 50px; }
  .section h2 { font-size: 36px; }
  .quote { padding: 28px; }
  .quote p { font-size: 20px; }
  .students-grid { grid-template-columns: 1fr 1fr; }
  .brand span { display: none; }
}

/* ============ ANIMAÇÕES SUTIS ============ */
.section { animation: fadeUp .6s ease both; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.flag-btn:focus-visible,
.nav-item:focus-visible,
.cta:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}