/* ==========================================================================
   Oasis Digital — Global Stylesheet
   ========================================================================== */

/* ---- Theme / Custom Properties ------------------------------------------ */
:root {
  --color-primary: #4f46e5;
  --color-primary-dark: #4338ca;
  --color-primary-light: #818cf8;
  --color-accent: #3b82f6;
  --color-bg: #ffffff;
  --color-bg-alt: #eef2ff;
  --color-bg-dark: #111827;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-text-inverse: #f8fafc;
  --color-border: #e2e8f0;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-danger: #dc2626;

  --shadow-sm: 0 1px 2px rgba(30, 41, 59, 0.06);
  --shadow-md: 0 4px 12px rgba(30, 41, 59, 0.08);
  --shadow-lg: 0 12px 32px rgba(30, 41, 59, 0.12);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --font-heading: 'Poppins', 'Segoe UI', system-ui, sans-serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, sans-serif;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  --container-width: 1200px;
}

/* ---- Reset ---------------------------------------------------------------*/
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font: inherit; cursor: pointer; }

/* ---- Typography ---------------------------------------------------------*/
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.6em;
  color: var(--color-text);
}
h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; color: var(--color-text-muted); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-bg-alt);
  padding: 0.35em 0.9em;
  border-radius: 999px;
  margin-bottom: 1rem;
}

/* ---- Layout Utilities -----------------------------------------------------*/
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}
.section { padding: clamp(3rem, 6vw, 5.5rem) 0; }
.section-alt { background: var(--color-bg-alt); }
.section-dark { background: var(--color-bg-dark); color: var(--color-text-inverse); }
.section-dark p { color: #cbd5e1; }
.section-header { max-width: 680px; margin: 0 auto 3rem; text-align: center; }
.section-header p { margin-bottom: 0; }
.grid {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
}
.grid-compact { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ---- Buttons ---------------------------------------------------------------*/
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.85em 1.8em;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,0.6);
  color: inherit;
}
.btn-outline:hover { background: rgba(255,255,255,0.12); transform: translateY(-2px); }
.btn-light {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-sm { padding: 0.55em 1.2em; font-size: 0.85rem; }
.btn-block { width: 100%; }

/* ---- Badges / Pills --------------------------------------------------------*/
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3em 0.8em;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-primary);
}
.badge-beginner { background: #dcfce7; color: var(--color-success); }
.badge-intermediate { background: #fef3c7; color: var(--color-warning); }
.badge-advanced { background: #fee2e2; color: var(--color-danger); }

.pill {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3em 0.85em;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-primary-dark);
  margin: 0 0.35em 0.35em 0;
}

/* ---- Navbar ----------------------------------------------------------------*/
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  max-width: var(--container-width);
  margin: 0 auto;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}
.nav-brand .brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-weight: 700;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.9rem;
}
.nav-links a {
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: 0.25em 0;
  transition: color var(--transition-fast);
}
.nav-links a:hover, .nav-links a.active { color: var(--color-primary); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}
.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 0.55em 1.3em;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.nav-cta:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 899px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }
  .nav-links.open { max-height: 420px; }
  .nav-links a { padding: 1rem 1.25rem; border-top: 1px solid var(--color-border); }
  .nav-links a.active::after { display: none; }
  .nav-links a.active { background: var(--color-bg-alt); }
  .nav-links .nav-cta { margin: 1rem 1.25rem; text-align: center; }
}

/* ---- Hero ------------------------------------------------------------------*/
.hero {
  padding: clamp(3.5rem, 8vw, 6.5rem) 0 clamp(3rem, 6vw, 5rem);
  background:
    radial-gradient(circle at 15% 20%, rgba(129,140,248,0.18), transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(59,130,246,0.16), transparent 45%),
    linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}
.hero h1 { margin-bottom: 0.5em; }
.hero .highlight { color: var(--color-primary); }
.hero-lead { font-size: 1.15rem; max-width: 520px; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.75rem; }
.hero-stats { display: flex; gap: 2.25rem; margin-top: 2.5rem; flex-wrap: wrap; }
.hero-stats div strong { display: block; font-family: var(--font-heading); font-size: 1.6rem; color: var(--color-primary); }
.hero-stats div span { font-size: 0.85rem; color: var(--color-text-muted); }

.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 420px;
  justify-self: center;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero-visual::before, .hero-visual::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.14);
}
.hero-visual::before { width: 180px; height: 180px; top: -50px; right: -50px; }
.hero-visual::after { width: 130px; height: 130px; bottom: -40px; left: -30px; }
.hero-visual-icon { font-size: 5rem; z-index: 1; }

@media (max-width: 899px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-lead { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-stats { justify-content: center; }
  .hero-visual { order: -1; }
}

/* ---- Cards -------------------------------------------------------------- */
.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--color-primary-light); }
.card-icon {
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  margin-bottom: 1.1rem;
}
.card h3 { margin-bottom: 0.5em; }
.card p { margin-bottom: 0; font-size: 0.95rem; }

/* Internship category card */
.internship-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.internship-card .card-footer-link {
  margin-top: auto;
  padding-top: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  transition: gap var(--transition-fast);
}
.internship-card:hover .card-footer-link { gap: 0.65em; }
.internship-card .card-meta {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

/* ---- How it works / steps ------------------------------------------------*/
.steps {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  counter-reset: step;
}
.step { text-align: center; }
.step .step-num {
  width: 46px; height: 46px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
}
.step h3 { font-size: 1.1rem; }
.step p { font-size: 0.92rem; }

/* ---- Benefits list --------------------------------------------------------*/
.benefit-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.benefit-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
}
.section-dark .benefit-item h3 { color: #fff; margin-bottom: 0.3em; font-size: 1.05rem; }
.section-dark .benefit-item p { font-size: 0.9rem; margin-bottom: 0; }

/* ---- CTA -------------------------------------------------------------------*/
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: clamp(2.5rem, 5vw, 4rem);
  text-align: center;
}
.cta-banner h2 { color: #fff; }
.cta-banner p { color: rgba(255,255,255,0.85); max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-banner .hero-actions { justify-content: center; }

/* ---- Footer ------------------------------------------------------------- */
.site-footer {
  background: var(--color-bg-dark);
  color: #cbd5e1;
  padding: 3.5rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  margin-bottom: 2.5rem;
}
.footer-brand .nav-brand { color: #fff; margin-bottom: 0.75rem; }
.footer-brand p { font-size: 0.92rem; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 1rem; }
.footer-col ul li { margin-bottom: 0.6rem; }
.footer-col a { font-size: 0.92rem; color: #94a3b8; transition: color var(--transition-fast); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: #64748b;
}
@media (max-width: 899px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---- Page Header (inner pages) -------------------------------------------*/
.page-header {
  padding: 3.5rem 0 2.5rem;
  text-align: center;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  border-bottom: 1px solid var(--color-border);
}
.page-header .eyebrow { margin-bottom: 0.75rem; }
.page-header p { max-width: 600px; margin: 0 auto; }
.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}
.breadcrumb a { color: var(--color-primary); font-weight: 600; }

/* ---- About page -----------------------------------------------------------*/
.values-grid { margin-top: 1rem; }
.value-card { text-align: left; }
.about-story {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.about-story-visual {
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--color-bg-alt), #dbeafe);
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem;
  box-shadow: var(--shadow-sm);
}
@media (max-width: 899px) {
  .about-story { grid-template-columns: 1fr; }
}
.stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  text-align: center;
}
.stat-strip .stat strong { display: block; font-family: var(--font-heading); font-size: 2.2rem; color: var(--color-primary); }
.stat-strip .stat span { font-size: 0.9rem; color: var(--color-text-muted); }

/* ---- Contact page ----------------------------------------------------------*/
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 2.5rem;
  align-items: flex-start;
}
@media (max-width: 899px) {
  .contact-grid { grid-template-columns: 1fr; }
}
.contact-info-card { display: flex; flex-direction: column; gap: 1.5rem; }
.contact-info-item { display: flex; gap: 1rem; align-items: flex-start; }
.contact-info-item .card-icon { margin-bottom: 0; flex-shrink: 0; }
.contact-info-item h4 { margin: 0 0 0.25em; font-family: var(--font-heading); font-size: 1rem; }
.contact-info-item p { margin: 0; font-size: 0.92rem; }

.form-field { margin-bottom: 1.25rem; }
.form-field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}
.form-field input,
.form-field textarea,
.form-field select {
  width: 100%;
  padding: 0.75em 1em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font: inherit;
  color: var(--color-text);
  background: #fff;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}
.form-field textarea { resize: vertical; min-height: 130px; }
.field-hint {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 0.4rem;
}
.form-note {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 0.75rem;
}
.form-success {
  display: none;
  margin-top: 1rem;
  padding: 0.9em 1.1em;
  background: #dcfce7;
  color: var(--color-success);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
}
.form-success.visible { display: block; }

/* ---- Internships listing page ----------------------------------------------*/
.filter-bar {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2.5rem;
}
.filter-chip {
  padding: 0.5em 1.1em;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}
.filter-chip:hover { border-color: var(--color-primary-light); color: var(--color-primary); }
.filter-chip.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }

/* ---- Internship Details page -------------------------------------------- */
.details-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2.5rem;
  align-items: flex-start;
}
@media (max-width: 899px) {
  .details-layout { grid-template-columns: 1fr; }
}
.details-main .card { margin-bottom: 1.75rem; }
.details-main .card:last-child { margin-bottom: 0; }
.details-sidebar {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.info-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.92rem;
}
.info-list li:last-child { border-bottom: none; }
.info-list li span:first-child { color: var(--color-text-muted); }
.info-list li span:last-child { font-weight: 600; text-align: right; }

.check-list li {
  position: relative;
  padding-left: 1.7em;
  margin-bottom: 0.6em;
  font-size: 0.95rem;
  color: var(--color-text);
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

.task-list {
  list-style: decimal;
  padding-left: 1.35em;
  margin: 0;
}
.task-list li {
  margin-bottom: 0.6em;
  padding-left: 0.3em;
  font-size: 0.95rem;
  color: var(--color-text);
}
.task-list li::marker {
  font-weight: 700;
  color: var(--color-primary);
}

.not-found {
  text-align: center;
  padding: 5rem 1rem;
}
.not-found .hero-visual-icon { font-size: 3.5rem; margin-bottom: 1rem; }

/* Full Stack project accordion */
.project-accordion { display: flex; flex-direction: column; gap: 1rem; }
.project-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #fff;
  transition: border-color var(--transition-fast);
}
.project-item:hover { border-color: var(--color-primary-light); }
.project-item-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.4rem;
  background: none;
  border: none;
  text-align: left;
}
.project-item-header-left { display: flex; align-items: center; gap: 0.9rem; }
.project-item-header h4 { margin: 0; font-family: var(--font-heading); font-size: 1.02rem; }
.project-item-chevron {
  flex-shrink: 0;
  transition: transform var(--transition-base);
  color: var(--color-text-muted);
}
.project-item.open .project-item-chevron { transform: rotate(180deg); }
.project-item-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base) ease;
}
.project-item.open .project-item-panel { max-height: 1400px; }
.project-item-panel-inner {
  padding: 0 1.4rem 1.4rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.1rem;
}
.project-item-panel-inner h5 {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin: 0.9rem 0 0.5rem;
}
.project-item-panel-inner h5:first-child { margin-top: 0; }

/* ---- Scroll-in animation --------------------------------------------------*/
.fade-in {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.in-view { opacity: 1; transform: translateY(0); }

/* ---- Responsive base -------------------------------------------------------*/
@media (max-width: 560px) {
  .hero-actions .btn, .cta-banner .btn { width: 100%; }
  .hero-stats { gap: 1.5rem; }
}