/* ==========================================================================
   Vision College Learning Centre - main stylesheet
   Written by hand on top of Bootstrap 5 (Bootstrap handles the grid/layout,
   this file just adds our own brand colours, fonts and small tweaks).
   ========================================================================== */

/* -------------------- Brand colours (from the Figma file) -------------------- */
:root {
  --clr-navy: #136194;         /* main brand blue - buttons, links, headings */
  --clr-navy-dark: #0e4c73;    /* a bit darker, used for hover states */
  --clr-light-blue: #dce7ff;   /* pale blue used on hero + chinese card */
  --clr-light-gray: #f5f5f5;   /* light grey used behind english card */
  --clr-text: #222222;         /* body paragraph text (near black, easier on the eyes than pure black) */
  --clr-white: #ffffff;

  --font-main: "Montserrat", "Segoe UI", Arial, sans-serif;
}

/* -------------------- General page setup -------------------- */
body {
  font-family: var(--font-main);
  color: var(--clr-text);
  /* smooth scrolling makes anchor links (like "Explore Courses") feel nicer */
  scroll-behavior: smooth;
}

h1, h2, h3, h4, h5, .fw-brand {
  font-family: var(--font-main);
  font-weight: 700;
  color: #000000;
}

a {
  text-decoration: none;
}

/* quick helper class for whenever we need navy-coloured text outside of the
   usual headings (saves us writing inline styles in the HTML) */
.text-navy {
  color: var(--clr-navy) !important;
}

/* Small section heading with the little underline bar under it, used a lot
   across the site (Our Programmes, About Us, Our Courses, Contact Us...) */
.section-heading {
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.section-heading-underline {
  width: 70px;
  height: 4px;
  background-color: var(--clr-navy);
  border: none;
  border-radius: 2px;
  margin: 0 auto 2.5rem auto;
}

.section-heading-underline.align-start {
  margin-left: 0;
}

/* -------------------- Buttons -------------------- */
/* We mostly reuse Bootstrap's btn classes but recolour them to match
   the navy brand colour instead of Bootstrap's default blue. */
.btn-brand {
  background-color: var(--clr-navy);
  border-color: var(--clr-navy);
  color: var(--clr-white);
  font-weight: 600;
  padding: 0.65rem 1.75rem;
  border-radius: 8px;
  transition: background-color 0.2s ease, transform 0.15s ease;
}

.btn-brand:hover,
.btn-brand:focus {
  background-color: var(--clr-navy-dark);
  border-color: var(--clr-navy-dark);
  color: var(--clr-white);
  transform: translateY(-2px);
}

.btn-brand-outline {
  background-color: transparent;
  border: 2px solid var(--clr-navy);
  color: var(--clr-navy);
  font-weight: 600;
  padding: 0.6rem 1.75rem;
  border-radius: 8px;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.15s ease;
}

.btn-brand-outline:hover,
.btn-brand-outline:focus {
  background-color: var(--clr-navy);
  color: var(--clr-white);
  transform: translateY(-2px);
}

/* every clickable button/link gets a visible focus ring for keyboard users
   (accessibility - people tabbing through the site with a keyboard need to
   be able to see where they are) */
.btn-brand:focus-visible,
.btn-brand-outline:focus-visible,
.nav-link:focus-visible,
a:focus-visible {
  outline: 3px solid #ffb703;
  outline-offset: 2px;
}

/* -------------------- Navbar -------------------- */
.navbar-vision {
  background-color: var(--clr-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.navbar-vision .navbar-brand img {
  height: 100px;
}

.navbar-vision .nav-link {
  color: var(--clr-navy);
  font-weight: 600;
  font-size: 1.05rem;
  margin-left: 0.5rem;
  margin-right: 0.5rem;
  position: relative;
}

/* the current page link gets a little underline so people know where
   they are on the site (this is basically the "you are here" HCI rule) */
.navbar-vision .nav-link.active {
  color: #000000;
}

.navbar-vision .nav-link.active::after {
  content: "";
  display: block;
  height: 3px;
  border-radius: 2px;
  background-color: var(--clr-navy);
  margin-top: 3px;
}

.navbar-vision .btn-brand {
  padding: 0.5rem 1.4rem;
  font-size: 0.95rem;
}

/* -------------------- Hero section (home page) -------------------- */
.hero-section {
  background-color: var(--clr-light-blue);
  border-radius: 0 0 40px 40px;
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
}

.hero-section h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.hero-section .hero-subtitle {
  color: var(--clr-navy);
  font-weight: 700;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
}

/* -------------------- Page header (About Us / Our Courses / Contact Us titles) -------------------- */
.page-header {
  position: relative;
  padding-top: 3rem;
  padding-bottom: 2.5rem;
  overflow: hidden;
}

.page-header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--clr-navy);
}

.page-header .flower-deco {
  position: absolute;
  top: 10px;
  width: 90px;
  opacity: 0.9;
  z-index: -1;
}

.page-header .flower-deco.left {
  left: -20px;
}

.page-header .flower-deco.right {
  right: -20px;
}

/* -------------------- Programme / course cards -------------------- */
.programme-card {
  border-radius: 20px;
  padding: 2.2rem;
  height: 100%;
}

.programme-card.card-gray {
  background-color: var(--clr-light-gray);
}

.programme-card.card-blue {
  background-color: var(--clr-light-blue);
}

.programme-card .icon-circle {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.programme-card.card-gray .icon-circle {
  background-color: var(--clr-light-blue);
}

.programme-card.card-blue .icon-circle {
  background-color: var(--clr-navy);
}

.programme-card .icon-circle img {
  width: 32px;
  height: 32px;
}

.programme-card h3 {
  color: var(--clr-navy);
  font-size: 1.6rem;
  margin-bottom: 0.15rem;
}

.programme-card .badge-age {
  font-weight: 600;
  color: #000;
  margin-bottom: 1rem;
  display: inline-block;
}

/* gentle hover lift so cards feel clickable/interactive */
.programme-card {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.programme-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(19, 97, 148, 0.12);
}

/* -------------------- About page -------------------- */
.about-photo {
  border-radius: 16px;
  width: 100%;
  height: auto;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.why-us-item {
  text-align: center;
  padding: 1rem;
}

.why-us-item img {
  height: 56px;
  margin-bottom: 1rem;
}

.why-us-item h4 {
  font-size: 1.15rem;
}

/* -------------------- Course detail pages (English / Chinese) -------------------- */
.course-detail-card {
  border-radius: 20px;
  padding: 2.5rem;
}

.course-detail-card.bg-gray {
  background-color: var(--clr-light-gray);
}

.course-detail-card.bg-blue {
  background-color: var(--clr-light-blue);
}

.course-detail-card img.student-photo {
  border-radius: 16px;
  width: 100%;
  height: auto;
}

.course-detail-card ul {
  padding-left: 1.2rem;
}

.course-detail-card ul li {
  margin-bottom: 0.35rem;
}

/* -------------------- Contact page -------------------- */
.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.contact-info-item i {
  color: var(--clr-navy);
  font-size: 1.4rem;
  margin-top: 0.15rem;
}

.contact-form-wrapper {
  background-color: var(--clr-light-blue);
  border-radius: 20px;
  padding: 2.2rem;
}

.contact-form-wrapper .form-control,
.contact-form-wrapper .form-select {
  border: none;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  margin-bottom: 1.2rem;
}

.contact-form-wrapper .form-control:focus,
.contact-form-wrapper .form-select:focus {
  box-shadow: 0 0 0 3px rgba(19, 97, 148, 0.35);
}

/* small red helper text that shows up under a field when validation fails */
.field-error {
  color: #c62828;
  font-size: 0.85rem;
  margin-top: -0.9rem;
  margin-bottom: 0.9rem;
  display: none;
}

/* -------------------- Footer -------------------- */
.footer-vision {
  background-color: var(--clr-navy);
  color: var(--clr-white);
  position: relative;
  overflow: hidden;
  padding-top: 3rem;
  padding-bottom: 1.5rem;
  margin-top: 4rem;
}

/* logo pinned to the top-left corner of the footer, with a small margin */
.footer-vision .footer-logo {
  position: absolute;
  top: -40px;
  left: -40px;
}

.footer-vision .footer-logo img {
  height: 100px;
}

.footer-vision h2 {
  color: var(--clr-white);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
}

.footer-vision .footer-contact-line {
  font-weight: 600;
  font-size: 1.1rem;
}

.footer-vision .footer-contact-line a {
  color: var(--clr-white);
}

.footer-vision .footer-contact-line a:hover {
  text-decoration: underline;
}

.footer-vision hr {
  border-color: rgba(255, 255, 255, 0.25);
  margin: 2rem 0 1rem 0;
}

.footer-vision .copyright {
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  opacity: 0.9;
}

.footer-vision .flower-deco {
  position: absolute;
  bottom: -100px;
  width: 240px;
  opacity: 0.85;
  z-index: 0;
}

.footer-vision .flower-deco.left {
  left: -60px;
}

.footer-vision .flower-deco.right {
  right: -150px;
  top: 25px;
}

.footer-vision .container {
  position: relative;
  z-index: 1;
}

/* -------------------- Back to top button -------------------- */
#backToTopBtn {
  position: fixed;
  bottom: 25px;
  right: 25px;
  z-index: 999;
  display: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--clr-navy);
  color: var(--clr-white);
  border: none;
  font-size: 1.3rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

#backToTopBtn:hover {
  background-color: var(--clr-navy-dark);
}

/* -------------------- Simple fade-in animation on page load -------------------- */
/* keeps things simple - no scroll-listener needed, elements just fade/slide
   up a little the moment the page finishes loading */
.fade-in-up {
  animation: fadeInUp 0.7s ease both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.25s; }

/* -------------------- Small screen tweaks (phones) -------------------- */
@media (max-width: 767.98px) {
  .hero-section {
    border-radius: 0 0 24px 24px;
    padding-top: 3rem;
    padding-bottom: 3rem;
  }

  .page-header .flower-deco {
    width: 55px;
  }

  .footer-vision .flower-deco {
    width: 90px;
  }


  .course-detail-card {
    padding: 1.5rem;
  }

  .programme-card {
    padding: 1.6rem;
  }
}

/* stop the decorative flowers from ever causing a horizontal scrollbar */
body {
  overflow-x: hidden;
}