:root {
  --font-sans: "Source Sans 3", "Segoe UI", Tahoma, sans-serif;
  --font-display: "Fraunces", "Times New Roman", serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-pill: 999px;

  --shadow-1: 0 6px 18px rgba(7, 22, 43, 0.08);
  --shadow-2: 0 14px 30px rgba(7, 22, 43, 0.12);

  --color-bg: #f3f7fb;
  --color-surface: #ffffff;
  --color-alt: #e6eef7;
  --color-text: #10243f;
  --color-muted: #294560;
  --color-border: #c7d5e5;

  --color-accent: #0b5ed7;
  --color-accent-strong: #084298;
  --color-link: #0a4ca8;
  --color-focus: #ffbf47;

  --section-space: clamp(3rem, 7vw, 5rem);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

main > section {
  scroll-margin-top: 5.75rem;
}

.site-section {
  padding-block: var(--section-space);
}

.section-alt {
  background-color: var(--color-alt);
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  line-height: 1.2;
  letter-spacing: -0.015em;
}

p,
li,
address,
.nav-link,
.form-text {
  color: var(--color-muted);
}

a {
  color: var(--color-link);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--color-accent-strong);
}

.lead {
  max-width: 62ch;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  line-height: 1.6;
}

.site-navbar {
  position: sticky;
  top: 0;
  z-index: 1020;
  border-bottom: 1px solid var(--color-border);
  background-color: rgba(255, 255, 255, 0.93);
  backdrop-filter: blur(8px) saturate(150%);
  -webkit-backdrop-filter: blur(8px) saturate(150%);
}

.navbar-brand {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.28rem, 2.6vw, 1.5rem);
  letter-spacing: 0.01em;
}

.navbar .nav-link {
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-4);
  color: var(--color-text);
  font-weight: 600;
}

.navbar .nav-link:hover {
  background-color: #e9f1fb;
}

.navbar .nav-link.active {
  background-color: #dbe9f9;
  color: var(--color-text);
  font-weight: 700;
}

.navbar-toggler {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.hero {
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(
      circle at 90% 10%,
      rgba(11, 94, 215, 0.12) 0%,
      rgba(11, 94, 215, 0) 45%
    ),
    linear-gradient(135deg, #eef4fb 0%, #f7fbff 55%, #ffffff 100%);
}

.hero-inner {
  padding-block: clamp(4rem, 10vw, 7rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.about-photo {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}

.about-carousel {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.about-carousel .carousel-control-prev,
.about-carousel .carousel-control-next {
  width: 2.4rem;
}

.about-carousel .carousel-control-prev-icon,
.about-carousel .carousel-control-next-icon {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-pill);
  background-color: rgba(16, 36, 63, 0.72);
  background-size: 55%;
}

.about-carousel .carousel-indicators [data-bs-target] {
  width: 0.6rem;
  height: 0.6rem;
  border: 0;
  border-radius: var(--radius-pill);
  background-color: rgba(16, 36, 63, 0.45);
}

.about-carousel .carousel-indicators .active {
  background-color: rgba(16, 36, 63, 0.9);
}

.content-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
}

.content-card ul {
  margin: 0;
  padding-left: 1.15rem;
}

.content-card li + li {
  margin-top: var(--space-2);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.project-card .project-link {
  margin-top: auto;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: #a9c2df;
  box-shadow: var(--shadow-2);
}

.project-card:focus-within {
  transform: translateY(-4px);
  border-color: #8eafd2;
  box-shadow: 0 0 0 3px rgba(11, 94, 215, 0.2);
}

.tech-badge {
  display: inline-block;
  margin-bottom: var(--space-2);
  padding: 0.35rem 0.72rem;
  border: 1px solid #b9cde2;
  border-radius: var(--radius-pill);
  background-color: #edf4fb;
  color: #193d63;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.list-inline-item:not(:last-child) {
  margin-right: var(--space-2);
}

.btn {
  border-radius: var(--radius-pill);
  padding: 0.58rem 1.15rem;
  font-weight: 700;
  transition:
    transform 140ms ease,
    box-shadow 140ms ease,
    background-color 140ms ease,
    border-color 140ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary:hover,
.btn-primary:focus-visible,
.btn-primary:active {
  border-color: var(--color-accent-strong);
  background-color: var(--color-accent-strong);
}

.btn-outline-primary {
  border-color: #8daed0;
  color: var(--color-accent-strong);
}

.btn-outline-primary:hover,
.btn-outline-primary:focus-visible,
.btn-outline-primary:active {
  border-color: var(--color-accent-strong);
  background-color: #eaf2fc;
  color: var(--color-accent-strong);
}

.contact-form .form-label {
  color: var(--color-text);
  font-weight: 700;
}

.contact-form .form-control {
  border-color: var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.68rem 0.78rem;
  color: var(--color-text);
}

.contact-form textarea.form-control {
  min-height: 8rem;
  resize: vertical;
}

.contact-form .form-control:focus {
  border-color: #84acd8;
  box-shadow: 0 0 0 0.2rem rgba(11, 94, 215, 0.16);
}

.contact-form .form-control.is-invalid {
  border-color: #b42318;
  background-image: none;
}

.form-error {
  min-height: 1.25rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: #9c1f16;
}

.form-status {
  min-height: 1.5rem;
  font-weight: 700;
}

.form-status.is-error {
  color: #842029;
}

.form-status.is-success {
  color: #0f5132;
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -3rem;
  z-index: 1100;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: #111827;
  color: #ffffff;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-3);
}

a:focus-visible,
button:focus-visible,
.nav-link:focus-visible,
.btn:focus-visible,
.navbar-toggler:focus-visible,
.form-control:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  box-shadow: none;
}

.site-footer {
  border-top-color: var(--color-border) !important;
  background-color: var(--color-surface);
}

address a {
  color: var(--color-link);
}

@media (max-width: 991.98px) {
  .site-navbar .navbar-collapse {
    margin-top: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    padding: var(--space-2);
    box-shadow: var(--shadow-1);
  }

  .site-navbar .navbar-nav {
    gap: var(--space-1);
  }
}

@media (max-width: 767.98px) {
  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .about-photo {
    margin-inline: auto;
    display: block;
  }

  #projects .h4 {
    font-size: 1.25rem;
  }
}

@media (min-width: 768px) and (max-width: 1199.98px) {
  .hero-inner {
    padding-block: clamp(4.5rem, 8vw, 6rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn,
  .project-card {
    transition: none;
  }

  .btn:hover,
  .project-card:hover,
  .project-card:focus-within {
    transform: none;
  }
}