/* ===========================
   THEME + DESIGN SYSTEM
   =========================== */
:root {
  /* Core palette (Light) */
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-2: #f0f4ff;
  --text: #1b2430;
  --muted: #5c677d;

  /* Brand */
  --primary: #1e88e5;
  --primary-2: #1565c0;
  --accent: #64b5f6;

  /* Effects */
  --ring: rgba(30, 136, 229, 0.35);
  --shadow-1: 0 6px 18px rgba(16, 24, 40, 0.08);
  --shadow-2: 0 12px 30px rgba(16, 24, 40, 0.12);

  /* Gradients */
  --grad-1: linear-gradient(135deg, #1e88e5, #64b5f6);
  --grad-2: linear-gradient(135deg, #1565c0, #1e88e5);
  --grad-3: linear-gradient(135deg, #2196f3, #1976d2);
}

/* Dark theme overrides */
:root[data-theme="dark"] {
  --bg: #0b1220;
  --surface: #0f172a;
  --surface-2: #111827;
  --text: #e6e9ef;
  --muted: #a3adc2;

  --primary: #66aaff;
  --primary-2: #3b82f6;
  --accent: #8bbcff;

  --ring: rgba(102, 170, 255, 0.35);

  --grad-1: linear-gradient(135deg, #0f3b8c, #2563eb);
  --grad-2: linear-gradient(135deg, #0b2458, #1f51d2);
  --grad-3: linear-gradient(135deg, #1d4ed8, #1e40af);
}

/* Base reset */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: 'Poppins', system-ui, -apple-system, Segoe UI, Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

/* ===========================
   NAVBAR
   =========================== */
.navbar {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: all .3s ease;
}
:root[data-theme="dark"] .navbar {
  background: rgba(11, 18, 32, 0.7);
  border-bottom-color: rgba(255,255,255,0.08);
}
.navbar.scrolled { box-shadow: var(--shadow-1); }

/* Make brand + links always readable */
.navbar .navbar-brand,
.navbar .nav-link {
  color: var(--text) !important;
  font-weight: 600;
}
:root[data-theme="dark"] .navbar .navbar-brand,
:root[data-theme="dark"] .navbar .nav-link {
  color: #e8efff !important;
}
.navbar .nav-link:hover,
.navbar .nav-link:focus,
.navbar .nav-link.active {
  color: #111827 !important;
}
:root[data-theme="dark"] .navbar .nav-link:hover,
:root[data-theme="dark"] .navbar .nav-link:focus,
:root[data-theme="dark"] .navbar .nav-link.active {
  color: #ffffff !important;
}

/* Underline animation — apply to all EXCEPT "Photos" */
.nav-link { position: relative; }
.nav-link:not(.nav-link-photos)::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 6px;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: currentColor;
  transition: width .25s ease;
}
.nav-link:not(.nav-link-photos):hover::after,
.nav-link:not(.nav-link-photos).active::after { width: 70%; }

/* Remove the small bar under "Photos" completely */
.nav-link-photos::after,
.nav-link-photos.active::after { display: none !important; }

/* "Photos" hover should be readable in dark theme */
.nav-link-photos:hover,
.nav-link-photos:focus { color: #ffd166 !important; text-shadow: 0 0 0 transparent; }

/* Theme toggle button */
.theme-toggle {
  border: 1px solid transparent;
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: .45rem .75rem;
  margin-left: .75rem;
  box-shadow: var(--shadow-1);
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  transition: transform .15s ease, box-shadow .2s ease, border-color .2s ease;
}
.theme-toggle:hover { transform: translateY(-1px); box-shadow: var(--shadow-2); border-color: var(--ring); }

/* Mobile toggler visibility */
.navbar .navbar-toggler { border-color: rgba(0,0,0,.25); }
:root[data-theme="dark"] .navbar .navbar-toggler { border-color: rgba(255,255,255,.35); }
:root[data-theme="dark"] .navbar .navbar-toggler-icon { filter: invert(1) brightness(1.6); }

/* ===========================
   HERO
   =========================== */
.hero-section {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: var(--grad-1);
  color: #fff;
  position: relative;
  padding: 8rem 0 5rem;
  overflow: hidden;
}
.hero-section::after {
  content:'';
  position: absolute; inset: auto 0 0 0; height: 140px;
  background: radial-gradient(80% 100% at 50% 120%, rgba(255,255,255,0.25), transparent 70%);
}
.hero-section .display-4 { font-weight: 800; text-shadow: 0 6px 24px rgba(0,0,0,0.25); }
.hero-section .lead { font-weight: 600; opacity: .95; }

.profile-image { position: relative; text-align: center; }
.profile-image::before {
  content: '';
  position: absolute; inset: -12px;
  border-radius: 50%;
  border: 2px dashed rgba(255,255,255,0.6);
  animation: spin 18s linear infinite;
}
.profile-image img {
  max-width: 300px; border-radius: 50%;
  border: 6px solid rgba(255,255,255,0.9);
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
  transition: transform .35s ease, filter .35s ease;
}
.profile-image img:hover { transform: scale(1.035); filter: brightness(1.06) contrast(1.06); }
@keyframes spin { to { transform: rotate(360deg); } }

/* Social icons */
.social-links { display: flex; gap: 1rem; flex-wrap: wrap; }
.social-links a {
  font-size: 1.25rem; width: 42px; height: 42px;
  display: grid; place-items: center;
  background: rgba(255,255,255,0.15);
  border-radius: 12px; color: #fff;
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.social-links a:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.25);
  box-shadow: 0 10px 20px rgba(0,0,0,0.25);
}

/* ===========================
   SECTIONS / CARDS
   =========================== */
.section-padding { padding: 6rem 0; }
.section-title {
  text-align: center;
  font-weight: 800;
  letter-spacing: .5px;
  margin-bottom: 2.5rem;
  color: var(--primary-2);
  position: relative;
}
.section-title::after {
  content: '';
  position: absolute; left: 50%; transform: translateX(-50%);
  bottom: -10px; width: 84px; height: 4px; border-radius: 2px; background: var(--grad-2);
}

/* Cards */
.skill-card, .education-card, .contact-info, .certificate-card, .gallery-item {
  background: var(--surface);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 18px;
  box-shadow: var(--shadow-1);
  transition: transform .25s ease, box-shadow .25s ease, border-color .2s ease;
}
:root[data-theme="dark"] .skill-card,
:root[data-theme="dark"] .education-card,
:root[data-theme="dark"] .contact-info,
:root[data-theme="dark"] .certificate-card,
:root[data-theme="dark"] .gallery-item { border-color: rgba(255,255,255,0.06); }

.skill-card { padding: 2.2rem; text-align: center; height: 100%; }
.skill-card:hover,
.certificate-card:hover,
.gallery-item:hover { transform: translateY(-8px); box-shadow: var(--shadow-2); border-color: var(--ring); }

.skill-card i {
  font-size: 2.6rem;
  background: var(--grad-3);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}
.skill-card h3 { color: var(--primary-2); margin-bottom: .75rem; }

.education-card { padding: 2rem; }
.education-card h3 { color: var(--primary-2); }

/* About */
#about .lead {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 800px; margin: 0 auto;
}

/* Contact */
.contact-info { padding: 2rem; }
.contact-item { display: flex; align-items: center; gap: 1rem; padding: .75rem 0; }
.contact-item i { font-size: 1.3rem; color: var(--primary); }

/* Gallery + Certificates */
.certificate-card img,
.gallery-item img {
  width: 100%; height: 280px; object-fit: cover; border-radius: 12px;
  transition: transform .3s ease, filter .3s ease;
}
.gallery-item img { height: 260px; }
.certificate-card:hover img,
.gallery-item:hover img { transform: scale(1.04); filter: brightness(1.06) contrast(1.06); }

/* Footer */
.footer { background: var(--grad-2); color: #fff; text-align: center; padding: 2rem 0; }

/* Dropdown styling */
.custom-navbar-dropdown {
  background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
  border: none; border-radius: 12px; padding: .5rem;
  box-shadow: var(--shadow-2);
}
.custom-navbar-dropdown .dropdown-item {
  color: #fff; font-weight: 600; border-radius: 8px; margin: 4px 0;
  background: rgba(255,255,255,0.08);
}
.custom-navbar-dropdown .dropdown-item:hover {
  background: linear-gradient(90deg, #2ecc71 0%, #27ae60 100%);
  transform: translateX(5px);
}

/* Make Bootstrap's "muted" readable in dark */
:root[data-theme="dark"] .text-muted { color: #93a4c7 !important; }
/* Light section backgrounds in dark theme */
:root[data-theme="dark"] .bg-light-subtle { background-color: #0d1526 !important; }

/* Smooth reveal (IntersectionObserver) */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* Images: lazy loading effect */
img[loading="lazy"] { filter: blur(2px); opacity: .85; transition: filter .4s ease, opacity .4s ease; }
img.lazy-done { filter: none; opacity: 1; }

/* Responsive tweaks */
@media (max-width: 991.98px) {
  .hero-section { text-align: center; padding: 7rem 0 4rem; }
  .social-links { justify-content: center; }
  .profile-image img { max-width: 240px; }
  .section-padding { padding: 4.5rem 0; }
  .gallery-item img, .certificate-card img { height: 220px; }
}

/* Utility */
a:not(.btn) { text-decoration: none; }
a:focus-visible,
button:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }