/* ================================================================
   STEM DORADO — SHARED DESIGN SYSTEM
   Copied from stemdorado-website/styles.css so both sites stay one
   family. Kept: tokens, reset, container, buttons, section headers,
   header/nav, footer, animations, scroll reveal and their responsive
   rules. Removed: home-page-only blocks (programs, video, why, reviews,
   services, slideshow, ticker, news, footer logo marquee) and the
   non-clickable mobile "Register" pseudo-element.
   Tutorials-specific styles live in tutorials.css — edit there, and
   keep this file in sync with the parent site.
   ================================================================ */

/* ===== CSS VARIABLES ===== */
:root {
  --primary: #0077b6;
  --primary-dark: #005a8d;
  --primary-light: #00b4d8;
  --secondary: #023e8a;
  --accent: #f77f00;
  --accent-light: #fca311;
  --dark: #1a2332;
  --darker: #0d1520;
  --text: #2d3436;
  --text-light: #636e72;
  --text-lighter: #b2bec3;
  --light: #f8f9fa;
  --lighter: #ffffff;
  --border: #e9ecef;
  --star: #fbbf24;
  --success: #10b981;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Space Grotesk', sans-serif;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-full: 50px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-primary: 0 8px 24px rgba(0, 119, 182, 0.3);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  line-height: 1.6;
  background: var(--lighter);
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1rem;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary);
}

.btn-outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-register-header {
  background: var(--primary);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  border: 2px solid var(--primary);
}

.btn-register-header:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-primary);
}

/* ===== SECTION HEADERS ===== */
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-label {
  display: inline-block;
  background: rgba(0, 119, 182, 0.08);
  color: var(--primary);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--dark);
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.section-title.left-align {
  text-align: left;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.highlight {
  color: var(--primary);
  position: relative;
}

/* ================================================================
   HEADER / NAVIGATION
   ================================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

/* ===== LOGO ===== */
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  height: 44px;
  width: auto;
  display: block;
  flex-shrink: 0;
}

.logo-word-wrap {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo .logo-stem {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: #4a2812;
}

.logo .logo-dorado {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a5c2a;
}

.logo-tagline {
  font-family: var(--font-body);
  font-size: 0.55rem;
  font-weight: 600;
  color: #4a2812;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ===== NAV LINKS ===== */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(0, 119, 182, 0.05);
}

.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-link i {
  font-size: 0.6rem;
  transition: transform 0.3s ease;
}

/* ===== DROPDOWN MENU ===== */
.nav-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 280px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
  border: 1px solid var(--border);
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
  z-index: 100;
}

/* Show dropdown on hover */
.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown:hover .nav-link i {
  transform: rotate(180deg);
}

/* Invisible bridge between nav link and dropdown */
.nav-dropdown::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 15px;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition);
}

.dropdown-item:hover {
  background: rgba(0, 119, 182, 0.05);
}

.dropdown-item i {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: var(--radius-sm);
  background: rgba(0, 119, 182, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 0.85rem;
  transition: var(--transition);
}

.dropdown-item:hover i {
  background: var(--primary);
  color: #fff;
}

.dropdown-title {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 0.1rem;
}

.dropdown-desc {
  display: block;
  font-size: 0.78rem;
  color: var(--text-light);
}

/* ===== REGISTER BUTTON ===== */
.btn-register-header {
  background: var(--primary);
  color: #fff;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.88rem;
  transition: var(--transition);
  border: 2px solid var(--primary);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-register-header:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-primary);
}

/* ===== HAMBURGER ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--dark);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}



/* ================================================================
   7. FOOTER
   ================================================================ */
.footer {
  background: var(--darker);
  color: rgba(255, 255, 255, 0.7);
}

.footer-top {
  padding: 60px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 3rem;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  display: inline-block;
  margin-bottom: 1rem;
}

.footer-logo .logo-stem {
  color: var(--primary-light);
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  color: rgba(255, 255, 255, 0.55);
}

.footer-socials {
  display: flex;
  gap: 0.75rem;
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 1rem;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  position: relative;
}

.footer-col h4::after {
  content: '';
  display: block;
  width: 30px;
  height: 2px;
  background: var(--primary);
  margin-top: 8px;
  border-radius: 2px;
}

.footer-col ul li {
  margin-bottom: 0.6rem;
}

.footer-col ul li a {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.55);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem !important;
}

.footer-contact li i {
  color: var(--primary-light);
  margin-top: 3px;
  font-size: 0.85rem;
  min-width: 16px;
}

.footer-contact li span,
.footer-contact li a {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.55);
}

.footer-contact li a:hover {
  color: var(--primary-light);
}

.footer-careers {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.6;
}

.footer-careers a {
  color: var(--primary-light);
  font-weight: 600;
  transition: var(--transition);
}

.footer-careers a:hover {
  color: #fff;
}

/* Footer Bottom */
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.5rem 0;
}

.footer-bottom-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.35);
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.35);
  transition: var(--transition);
}

.footer-bottom-links a:hover {
  color: rgba(255, 255, 255, 0.7);
}

/* ================================================================
   ANIMATIONS
   ================================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-8px);
  }
}

/* Scroll reveal animation class */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ================================================================
   RESPONSIVE (shared parts)
   ================================================================ */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .btn-register-header {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* Mobile Menu Slide-in */
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: #fff;
    padding: 90px 1.5rem 2rem;
    box-shadow: var(--shadow-lg);
    transition: right 0.3s ease;
    z-index: 999;
    overflow-y: auto;
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-menu .nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }

  .nav-link {
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    width: 100%;
  }

  /* Mobile Dropdown */
  .nav-dropdown::after {
    display: none;
  }

  .dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: none;
    padding: 0 0 0 1rem;
    min-width: auto;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-dropdown.open .dropdown-menu {
    max-height: 500px;
  }

  .dropdown-item {
    padding: 0.7rem 1rem;
  }

  /* Sections mobile */
  .section-title {
    font-size: 1.8rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .logo-tagline {
    display: none;
  }

  .logo-icon {
    height: 36px;
  }

  .nav-menu {
    width: 100%;
  }
}