/* =========================================================
   Aleem Akhtar - Academic Profile
   style.css
   Palette: light background, navy/charcoal text, soft blue accent
   ========================================================= */

:root {
  --bg: #ffffff;
  --bg-alt: #f4f7fb;          /* very light blue section band */
  --bg-soft: #eaf1f9;
  --text: #1f2a37;            /* charcoal */
  --text-strong: #0f2742;     /* dark navy */
  --muted: #5b6b7c;
  --accent: #2f6fb3;          /* soft blue */
  --accent-dark: #245a93;
  --border: #e2e8f0;
  --card-bg: #ffffff;
  --shadow: 0 1px 3px rgba(15, 39, 66, 0.06), 0 6px 18px rgba(15, 39, 66, 0.05);
  --nav-bg: rgba(255, 255, 255, 0.95);
  --footer-bg: #0f2742;
  --radius: 12px;
  --maxw: 1140px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
}

/* ---------- Dark theme ---------- */
[data-bs-theme="dark"] {
  --bg: #0f1722;
  --bg-alt: #141f2c;
  --bg-soft: #1a2738;
  --text: #ccd6e2;
  --text-strong: #f1f5fa;
  --muted: #93a1b3;
  --accent: #5b9bd9;
  --accent-dark: #7db4ea;
  --border: #283545;
  --card-bg: #16212e;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 6px 18px rgba(0, 0, 0, 0.35);
  --nav-bg: rgba(15, 23, 34, 0.95);
  --footer-bg: #0b121b;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.65;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { color: var(--text-strong); font-weight: 700; line-height: 1.25; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; }

p { margin-bottom: 1rem; }

/* ---------- Accessibility helpers ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 2000;
  background: var(--text-strong);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; color: var(--bg); text-decoration: none; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Navigation ---------- */
.site-nav {
  background-color: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  padding-top: 0.6rem;
  padding-bottom: 0.6rem;
}

/* ---------- Theme toggle ---------- */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-strong);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle:hover { background: var(--bg-soft); color: var(--accent); }
.theme-toggle .theme-icon-light { display: none; }
[data-bs-theme="dark"] .theme-toggle .theme-icon-dark { display: none; }
[data-bs-theme="dark"] .theme-toggle .theme-icon-light { display: inline-block; }
.site-nav .navbar-brand {
  color: var(--text-strong);
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}
.site-nav .nav-link {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0.7rem;
}
.site-nav .nav-link:hover,
.site-nav .nav-link:focus { color: var(--accent); }
.site-nav .nav-link.active { color: var(--text-strong); font-weight: 600; }

/* ---------- Layout / sections ---------- */
.container { max-width: var(--maxw); }

.section { padding: 5rem 0; }
.section-alt { background-color: var(--bg-alt); }

.section-title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  margin-bottom: 0.5rem;
  position: relative;
}
.section-title::after {
  content: "";
  display: block;
  width: 52px;
  height: 4px;
  background: var(--accent);
  border-radius: 4px;
  margin-top: 0.75rem;
}
.section-subtitle {
  color: var(--muted);
  max-width: 760px;
  margin-bottom: 2rem;
}
.group-title {
  font-size: 1.2rem;
  margin: 0 0 1.25rem;
  color: var(--text-strong);
}

/* ---------- Buttons ---------- */
.btn { font-weight: 600; border-radius: 8px; padding: 0.55rem 1.15rem; }
.btn-primary { background-color: var(--accent); border-color: var(--accent); }
.btn-primary:hover, .btn-primary:focus { background-color: var(--accent-dark); border-color: var(--accent-dark); }
.btn-outline-primary { color: var(--accent); border-color: var(--accent); }
.btn-outline-primary:hover, .btn-outline-primary:focus { background-color: var(--accent); border-color: var(--accent); color: #fff; }
.btn-outline-secondary { color: var(--text-strong); border-color: var(--border); }
.btn-outline-secondary:hover, .btn-outline-secondary:focus { background-color: var(--text-strong); border-color: var(--text-strong); color: var(--bg); }

/* ---------- Hero ---------- */
.hero-section {
  padding: 8rem 0 4.5rem;
  background:
    radial-gradient(1200px 400px at 80% -10%, var(--bg-soft), transparent 60%),
    var(--bg);
}
.hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.hero-name {
  font-size: clamp(2.2rem, 5vw, 3.25rem);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}
.hero-headline {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  font-weight: 600;
  color: var(--text-strong);
  margin-bottom: 1rem;
}
.hero-intro {
  font-size: 1.05rem;
  color: var(--text);
  max-width: 640px;
  margin-bottom: 1.75rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.75rem; }
.hero-links { display: flex; flex-wrap: wrap; gap: 1.25rem; margin: 0; }
.hero-links a { color: var(--muted); font-weight: 500; }
.hero-links a:hover { color: var(--accent); text-decoration: none; }
.hero-photo {
  width: 280px;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  height: auto;
  object-fit: cover;
  border-radius: 50%;
  border: 6px solid var(--card-bg);
  box-shadow: var(--shadow);
}

/* ---------- Subject cards (Teaching) ---------- */
.subject-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  height: 100%;
  font-weight: 500;
  color: var(--text-strong);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.subject-card i { color: var(--accent); margin-right: 0.5rem; }
.subject-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

/* ---------- Teaching philosophy ---------- */
.philosophy-quote {
  border-left: 4px solid var(--accent);
  background: var(--bg-alt);
  padding: 1.5rem 1.75rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 1.1rem;
  color: var(--text);
  margin: 0;
}

/* ---------- Tags / pills ---------- */
.tag-list { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0; }
.tag {
  background: var(--bg-soft);
  color: var(--text-strong);
  border: 1px solid #d7e2f0;
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font-size: 0.95rem;
  font-weight: 500;
}
.tag-sm { font-size: 0.83rem; padding: 0.3rem 0.7rem; }

/* ---------- Thesis panel ---------- */
.thesis-panel {
  background: linear-gradient(180deg, var(--bg-soft), var(--card-bg));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 2.5rem;
  box-shadow: var(--shadow);
}
.badge-academic {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--text-strong);
  color: #fff;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}
[data-bs-theme="dark"] .badge-academic {
  background: var(--accent);
  color: #0f1722;
}
.feature-pill {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-strong);
  height: 100%;
}
.feature-pill i { color: var(--accent); margin-right: 0.45rem; }
.thesis-thumb { width: 100%; height: auto; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow); }

/* ---------- Project cards ---------- */
.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  height: 100%;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
}
.project-card:hover { transform: translateY(-3px); }
.project-title { font-size: 1.1rem; margin-bottom: 0.6rem; }
.project-card--muted { background: var(--bg-alt); box-shadow: none; }

.applied-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  height: 100%;
  font-weight: 500;
  color: var(--text-strong);
}
.applied-card i { color: var(--accent); font-size: 1.3rem; }

/* ---------- Timeline (Experience) ---------- */
.timeline {
  position: relative;
  margin: 0;
  padding-left: 2rem;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: #d7e2f0;
}
.timeline-item { position: relative; padding-bottom: 2.25rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--card-bg);
  box-shadow: 0 0 0 2px #d7e2f0;
}
.timeline-content {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.timeline-role { font-size: 1.15rem; margin-bottom: 0.2rem; }
.timeline-org { font-weight: 600; color: var(--accent-dark); margin-bottom: 0.1rem; }
.timeline-date { color: var(--muted); font-size: 0.9rem; margin-bottom: 0.75rem; }
.timeline-content ul { margin: 0; padding-left: 1.1rem; }
.timeline-content li { margin-bottom: 0.4rem; }

/* ---------- Education ---------- */
.edu-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.5rem;
  height: 100%;
  box-shadow: var(--shadow);
}
.edu-degree { font-size: 1.1rem; margin-bottom: 0.3rem; }
.edu-school { font-weight: 600; color: var(--accent-dark); margin-bottom: 0.1rem; }
.edu-date { color: var(--muted); font-size: 0.9rem; margin-bottom: 0.85rem; }
.edu-meta li { margin-bottom: 0.4rem; font-size: 0.95rem; }

/* ---------- Supervised FYP accordion ---------- */
.fyp-accordion {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.fyp-accordion .accordion-item { background: var(--card-bg); border: 0; }
.fyp-accordion .accordion-button {
  font-weight: 600;
  color: var(--text-strong);
  background: var(--card-bg);
}
.fyp-accordion .accordion-button:not(.collapsed) {
  color: var(--accent-dark);
  background: var(--bg-soft);
  box-shadow: none;
}
.fyp-accordion .accordion-button:focus {
  box-shadow: 0 0 0 0.2rem rgba(47, 111, 179, 0.25);
}
.fyp-list {
  margin: 0;
  padding-left: 1.25rem;
  columns: 2;
  column-gap: 2.5rem;
}
.fyp-list li {
  margin-bottom: 0.55rem;
  break-inside: avoid;
  color: var(--text);
}

/* ---------- Publications ---------- */
.pub-list { counter-reset: pub; }
.pub-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 0.85rem;
}
.pub-text { counter-increment: pub; font-weight: 500; color: var(--text-strong); }
.pub-text::before { content: counter(pub) ". "; color: var(--accent); font-weight: 700; }
.pub-authors { color: var(--text); margin-top: 0.2rem; margin-left:1.2rem;}
.pub-venue { color: var(--muted); margin-left:1.2rem;}

/* ---------- Skills ---------- */
.skill-group {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  height: 100%;
  box-shadow: var(--shadow);
}
.skill-group-title { font-size: 1.05rem; margin-bottom: 1rem; }
.skill-group-title i { color: var(--accent); margin-right: 0.4rem; }

/* ---------- Info cards (certifications) ---------- */
.info-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  height: 100%;
  box-shadow: var(--shadow);
}
.info-card-title { font-size: 1.1rem; margin-bottom: 1rem; }
.info-card-title i { color: var(--accent); margin-right: 0.4rem; }
.info-list li { margin-bottom: 0.5rem; }

/* ---------- Awards ---------- */
.award-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  height: 100%;
  font-weight: 500;
  color: var(--text-strong);
}
.award-item i { color: var(--accent); margin-right: 0.5rem; }

/* ---------- Contact ---------- */
.contact-message { font-size: 1.1rem; max-width: 600px; }
.contact-list li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}
.contact-list li:last-child { border-bottom: none; }
.contact-list i { color: var(--accent); font-size: 1.1rem; width: 1.25rem; text-align: center; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--footer-bg);
  color: #cdd9e6;
  padding: 2rem 0;
}
.footer-text { font-size: 0.92rem; }
.footer-links { display: flex; gap: 1rem; justify-content: flex-end; }
.footer-links a {
  color: #cdd9e6;
  font-size: 1.25rem;
  display: inline-flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
}
.footer-links a:hover { color: #fff; background: rgba(255, 255, 255, 0.1); text-decoration: none; }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: 1000;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--accent-dark); color: #fff; text-decoration: none; }

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
  .site-nav { background-color: var(--nav-bg); }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 767.98px) {
  .hero-section { padding: 7rem 0 3rem; text-align: left; }
  .section { padding: 3.5rem 0; }
  .thesis-panel { padding: 1.5rem; }
  .pub-item { flex-direction: column; align-items: flex-start; }
  .fyp-list { columns: 1; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}