/* ==========================================================================
   Bishwas Paudel — Portfolio
   Design tokens
   ========================================================================== */
:root {
  /* Color */
  --color-primary: #0f6d5c;
  --color-primary-dark: #0a4f42;
  --color-primary-tint: #e6f1ee;
  --color-secondary: #2c5f8a;
  --color-secondary-tint: #e9f0f6;
  --color-accent: #c9762f;

  --color-bg: #ffffff;
  --color-bg-alt: #f6f8f7;
  --color-surface: #ffffff;

  --color-text: #171f1c;
  --color-text-muted: #5c6a65;
  --color-text-faint: #8a978f;

  --color-border: #e1e7e4;
  --color-border-strong: #cad4d0;

  --color-focus: #0f6d5c;

  /* Type */
  --font-display: "Fraunces", "Georgia", serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  /* Scale */
  --step-xs: clamp(0.78rem, 0.75rem + 0.12vw, 0.85rem);
  --step-sm: clamp(0.9rem, 0.87rem + 0.15vw, 1rem);
  --step-base: clamp(1rem, 0.97rem + 0.15vw, 1.08rem);
  --step-md: clamp(1.15rem, 1.1rem + 0.25vw, 1.3rem);
  --step-lg: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);
  --step-xl: clamp(2rem, 1.7rem + 1.5vw, 2.9rem);
  --step-xxl: clamp(2.6rem, 2.1rem + 2.5vw, 4.2rem);

  /* Space */
  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs: 0.75rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  /* Misc */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --border-w: 1px;
  --content-max: 1120px;
  --content-narrow: 720px;
  --transition-fast: 150ms ease;
  --transition-base: 220ms ease;
}

/* ==========================================================================
   Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, dl, p { margin: 0; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

/* Focus visibility */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

.icon { width: 1em; height: 1em; }

/* ==========================================================================
   Layout helpers
   ========================================================================== */
.section {
  padding: var(--space-2xl) var(--space-md);
}
.section--alt {
  background: var(--color-bg-alt);
  border-top: var(--border-w) solid var(--color-border);
  border-bottom: var(--border-w) solid var(--color-border);
}
.section__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}
.section__inner--narrow {
  max-width: var(--content-narrow);
}
.section__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin: 0 0 var(--space-xs);
}
.section__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-xl);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-md);
}
.section__intro {
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-lg);
  font-size: var(--step-md);
}

/* Reveal-on-scroll (subtle) */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ==========================================================================
   Buttons & tags
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: var(--step-sm);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  border: var(--border-w) solid transparent;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover { background: var(--color-primary-dark); }
.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  border: var(--border-w) solid var(--color-border-strong);
  color: var(--color-text-muted);
}
.tag--soon {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-border-strong));
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
}
.tag--footer {
  color: var(--color-text-faint);
  border-color: rgba(255,255,255,0.18);
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: var(--border-w) solid var(--color-border);
}
.nav {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
}
.nav__logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
}
.nav__logo-dot { color: var(--color-primary); }

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.nav__link {
  font-size: var(--step-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.35rem 0.1rem;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.nav__link:hover {
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.nav__link--cta {
  color: var(--color-primary);
  font-weight: 600;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 0.5rem;
}
.nav__toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding: var(--space-3xl) var(--space-md) 0;
  max-width: var(--content-max);
  margin: 0 auto;
}
.hero__inner {
  max-width: 46rem;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.08em;
  color: var(--color-secondary);
  margin: 0 0 var(--space-sm);
}
.hero__name {
  font-family: var(--font-display);
  font-weight: 680;
  font-size: var(--step-xxl);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-md);
  color: var(--color-text);
}
.hero__lede {
  font-size: var(--step-md);
  color: var(--color-text-muted);
  max-width: 42rem;
  margin-bottom: var(--space-sm);
}
.hero__location {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-lg);
}
.hero__actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

/* Signature pulse-to-circuit divider */
.pulse-divider {
  width: 100%;
  color: var(--color-primary);
  opacity: 0.85;
}
.pulse-divider__svg {
  width: 100%;
  height: auto;
  display: block;
}
.pulse-divider__path {
  stroke-dasharray: 2000;
  stroke-dashoffset: 2000;
  animation: draw-pulse 1800ms ease-out forwards;
}
.pulse-divider__node {
  opacity: 0;
  animation: node-appear 400ms ease-out 1700ms forwards;
}
@keyframes draw-pulse {
  to { stroke-dashoffset: 0; }
}
@keyframes node-appear {
  to { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .pulse-divider__path { stroke-dashoffset: 0; animation: none; }
  .pulse-divider__node { opacity: 1; animation: none; }
}

/* ==========================================================================
   About
   ========================================================================== */
.about__body p {
  color: var(--color-text);
  font-size: var(--step-md);
  margin-bottom: var(--space-sm);
  max-width: 62ch;
}
.about__body p:last-child { margin-bottom: 0; }

/* ==========================================================================
   Education
   ========================================================================== */
.edu-card {
  display: flex;
  gap: var(--space-md);
  background: var(--color-surface);
  border: var(--border-w) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  max-width: 44rem;
}
.edu-card__mark {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-sm);
  background: var(--color-primary-tint);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}
.edu-card__mark svg { width: 1.5rem; height: 1.5rem; }
.edu-card__school {
  font-family: var(--font-display);
  font-size: var(--step-lg);
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.edu-card__status {
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  color: var(--color-secondary);
  margin-bottom: var(--space-md);
}
.edu-card__details {
  display: grid;
  gap: var(--space-xs);
}
.edu-card__row {
  display: flex;
  gap: var(--space-sm);
  padding-top: var(--space-xs);
  border-top: var(--border-w) solid var(--color-border);
}
.edu-card__row:first-child { border-top: none; padding-top: 0; }
.edu-card__row dt {
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  color: var(--color-text-faint);
  width: 6rem;
  flex-shrink: 0;
  padding-top: 0.15rem;
}
.edu-card__row dd {
  margin: 0;
  font-weight: 500;
}

/* ==========================================================================
   Skills
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
}
.skill-card {
  border: var(--border-w) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  background: var(--color-surface);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}
.skill-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}
.skill-card__title {
  font-family: var(--font-display);
  font-size: var(--step-md);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

/* ==========================================================================
   Empty states (projects / experience)
   ========================================================================== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  border: 1.5px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-2xl) var(--space-md);
  color: var(--color-text-faint);
  max-width: 32rem;
}
.empty-state__mark {
  width: 2.75rem;
  height: 2.75rem;
  color: var(--color-text-faint);
}
.empty-state__mark svg { width: 100%; height: 100%; }
.empty-state__text {
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.02em;
}

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-list {
  display: grid;
  gap: var(--space-sm);
}
.contact-list__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: var(--border-w) solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.contact-list__icon {
  width: 1.4rem;
  height: 1.4rem;
  color: var(--color-secondary);
  flex-shrink: 0;
}
.contact-list__icon svg { width: 100%; height: 100%; }
.contact-list__label {
  font-weight: 500;
  flex: 1;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: #12201c;
  color: #d9e3df;
}
.footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1.2fr 1fr 1fr;
}
.footer__name {
  font-family: var(--font-display);
  font-size: var(--step-lg);
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.35rem;
}
.footer__tagline {
  font-size: var(--step-xs);
  color: #9fb0aa;
  font-family: var(--font-mono);
}
.footer__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}
.footer__nav a {
  color: #c3d1cc;
  font-size: var(--step-sm);
  width: fit-content;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.footer__nav a:hover {
  color: #fff;
  border-color: rgba(255,255,255,0.35);
}
.footer__social {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2xs);
}
.footer__bottom {
  border-top: var(--border-w) solid rgba(255,255,255,0.1);
  padding: var(--space-md);
  text-align: center;
  font-size: var(--step-xs);
  color: #8ea099;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 860px) {
  .footer__inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav__toggle {
    display: inline-flex;
  }
  .nav__menu {
    position: fixed;
    inset: 64px 0 0 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--color-bg);
    padding: var(--space-md);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
  }
  .nav__menu.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .nav__menu li { width: 100%; }
  .nav__link {
    display: block;
    width: 100%;
    padding: var(--space-sm) 0.1rem;
    font-size: var(--step-md);
    border-bottom: var(--border-w) solid var(--color-border);
  }

  .hero { padding-top: var(--space-2xl); }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .hero__actions { flex-direction: column; }

  .edu-card { flex-direction: column; padding: var(--space-md); }

  .section { padding: var(--space-xl) var(--space-md); }
}

@media (max-width: 480px) {
  .contact-list__item { flex-wrap: wrap; }
}