/* ===== Tailwind Sky Blue Palette ===== */
:root {
  --sky-50:  #f0f9ff;
  --sky-100: #e0f2fe;
  --sky-200: #bae6fd;
  --sky-300: #7dd3fc;
  --sky-400: #38bdf8;
  --sky-500: #0ea5e9;
  --sky-600: #0284c7;
  --sky-700: #0369a1;
  --sky-800: #075985;
  --sky-900: #0c4a6e;

  --white:    #ffffff;
  --slate-600:#475569;
  --slate-700:#334155;
  --slate-800:#1e293b;

  --bg:           var(--sky-50);
  --text:         var(--slate-700);
  --text-heading: var(--sky-900);
  --accent:       var(--sky-500);
  --accent-hover: var(--sky-600);
  --card-bg:      var(--white);
  --border:       var(--sky-200);
  --shadow:       0 4px 24px rgba(14, 165, 233, 0.10);
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--accent-hover);
}

img {
  display: block;
  max-width: 100%;
}

/* ===== Navbar ===== */
.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}
.navbar__inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}
.navbar__brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--sky-800);
  letter-spacing: -0.02em;
}
.navbar__links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}
.navbar__links a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--slate-600);
}
.navbar__links a:hover,
.navbar__links a.active {
  color: var(--accent);
}

.navbar__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
  width: 36px;
}
.navbar__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--slate-600);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.navbar--open .navbar__toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.navbar--open .navbar__toggle span:nth-child(2) {
  opacity: 0;
}
.navbar--open .navbar__toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Main Container ===== */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

/* ===== About Card ===== */
.about {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 3rem 2.5rem;
  text-align: center;
}

.about__photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  background: var(--sky-100);
  border: 4px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.about__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about__name {
  font-size: 2rem;
  font-weight: 800;
  color: var(--sky-900);
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
}

.about__title {
  font-size: 1.05rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1.25rem;
}

.about__bio {
  font-size: 1rem;
  color: var(--slate-600);
  max-width: 480px;
  margin: 0 auto 2rem;
  line-height: 1.75;
  text-align: justify;
}

.about__links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.about__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  color: var(--accent);
  transition: background 0.2s ease, color 0.2s ease;
}
.about__link:hover {
  background: var(--sky-50);
}
.about__link svg {
  width: 18px;
  height: 18px;
}

.about__link--copy {
  cursor: pointer;
  user-select: none;
}

/* ===== Copy toast ===== */
.copy-toast {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(14, 165, 233, 0.3);
  transform: translateY(-100%);
  opacity: 1;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.copy-toast--fade {
  opacity: 0;
  transform: translateY(-120%);
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--sky-400);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}
.footer__inner {
  max-width: 720px;
  margin: 0 auto;
}

/* ===== Responsive: Navbar ===== */
@media (max-width: 640px) {
  .navbar__inner {
    flex-wrap: wrap;
    height: auto;
    min-height: 60px;
    padding: 0.5rem 0;
  }
  .navbar__toggle {
    display: flex;
  }
  .navbar__links {
    display: none;
    flex: 1 0 100%;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.75rem 0 0.25rem;
  }
  .navbar--open .navbar__links {
    display: flex;
  }
}

/* ===== Responsive: About Page ===== */
@media (max-width: 600px) {
  .container {
    padding: 1.5rem 1rem 2.5rem;
  }
  .about {
    padding: 2rem 1rem;
    border-radius: 12px;
  }
  .about__photo {
    width: 100px;
    height: 100px;
    margin-bottom: 1rem;
  }
  .about__name {
    font-size: 1.5rem;
  }
  .about__title {
    font-size: 0.95rem;
    margin-bottom: 1rem;
  }
  .about__bio {
    font-size: 0.92rem;
    max-width: none;
    text-align: left;
    margin-bottom: 1.5rem;
  }
  .about__links {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding-top: 1.25rem;
  }
  .about__link {
    font-size: 0.9rem;
  }
}

/* ===== Utility ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
  clip: rect(0, 0, 0, 0);
}