/* =========================================================================
 * site-nav.css
 *
 * The sidebar + mobile navigation for the two top-level pages
 * (index.html, about.html).
 *
 * This file used to exist twice: home.css and about.css each carried a
 * byte-for-byte copy of ~440 lines of sidebar rules, so any nav tweak had
 * to be made in two places and inevitably drifted. Both copies are gone;
 * this is now the only definition.
 *
 * Layout model
 *   > 768px  Fixed sidebar down the left, content column to its right.
 *            Unchanged from the original design.
 *   <= 768px The sidebar becomes a full-width panel that DROPS DOWN from a
 *            slim fixed top bar. Previously it slid in from the left and
 *            shoved the entire page sideways, which is awkward one-handed
 *            and caused a horizontal scroll on narrow screens.
 * ========================================================================= */

:root {
  --nav-accent: #F75940;
  --nav-bar-height: 58px;
  --nav-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* -------------------------------------------------------------------------
 * 1. Page shell
 * ---------------------------------------------------------------------- */
#colorlib-page {
  width: 100%;
  position: relative;
  overflow-x: hidden;
}

/* -------------------------------------------------------------------------
 * 2. Sidebar (desktop)
 * ---------------------------------------------------------------------- */
#colorlib-aside {
  padding: 3em 3em 40px;
  width: 20%;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  overflow-y: auto;
  z-index: 1001;
  background: #fff;
  transition: transform 0.4s var(--nav-ease);
}

@media screen and (max-width: 1200px) {
  #colorlib-aside { width: 30%; }
}

#colorlib-aside #colorlib-logo {
  text-align: right;
  font-weight: 400;
  font-size: 22px;
  text-transform: uppercase;
  margin-bottom: 3em;
  display: block;
  width: 100%;
}

/* A true square: fixed equal width and height with the two lines centred
   inside, rather than a padded inline-block whose proportions drift with
   the font. */
#colorlib-aside #colorlib-logo a {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 76px;
  height: 76px;
  background: #000;
  color: #fff;
  font-size: 20px;
  line-height: 1.3;
  /* Without this the browser's default link underline draws across both
     letter pairs. */
  text-decoration: none;
}

#colorlib-aside #colorlib-logo a:hover,
#colorlib-aside #colorlib-logo a:focus {
  text-decoration: none;
}

#colorlib-aside #colorlib-logo a span {
  display: block;
  letter-spacing: 6px;
  /* letter-spacing appends a trailing gap after the final glyph, which
     drags the pair visually left of centre; the matching indent puts it
     back. */
  text-indent: 6px;
  text-decoration: none;
}

/* --- menu ---------------------------------------------------------- */
#colorlib-aside #colorlib-main-menu {
  margin-bottom: 3em;
}

#colorlib-aside #colorlib-main-menu ul {
  text-align: right;
  margin: 0;
  padding: 0;
  list-style: none;
}

#colorlib-aside #colorlib-main-menu ul li {
  /* The rhythm between items now comes entirely from this margin. It
     used to come from 10px of vertical padding on the link itself, which
     enlarged each link's hit area into a band well below its text. */
  margin: 0 0 22px 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

#colorlib-aside #colorlib-main-menu ul li a {
  position: relative;
  display: inline-block;
  /* Grey by default, black on hover — the menu should sit quietly behind
     the work, not compete with it. */
  color: rgba(0, 0, 0, 0.4);
  text-decoration: none;
  padding: 0;
  font-family: "Quicksand", Arial, sans-serif;
  transition: color 0.3s var(--nav-ease);
}

/* Underline wipes in from the right, matching the sidebar's right-aligned
   text. The case-study nav uses the same affordance mirrored. */
#colorlib-aside #colorlib-main-menu ul li a::after {
  content: '';
  position: absolute;
  height: 1px;
  bottom: -4px;
  left: 0;
  right: 0;
  background-color: #000;
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#colorlib-aside #colorlib-main-menu ul li a:hover,
#colorlib-aside #colorlib-main-menu ul li a:focus {
  color: #000;
}

#colorlib-aside #colorlib-main-menu ul li a:hover::after,
#colorlib-aside #colorlib-main-menu ul li a:focus::after {
  transform: scaleX(1);
}

#colorlib-aside #colorlib-main-menu ul li.colorlib-active a {
  color: #000;
}

#colorlib-aside #colorlib-main-menu ul li.colorlib-active a::after {
  transform: scaleX(1);
}

/* --- footer / social ----------------------------------------------- */
/* Pinned to the bottom of the sidebar with 40px of clearance, rather
   than floating directly under the menu. */
#colorlib-aside .colorlib-footer {
  position: absolute;
  bottom: 40px;
  right: 1.5em;
  left: 1.5em;
  padding: 0 20px;
  text-align: right;
  font-size: 15px;
  font-weight: 400;
  color: rgba(0, 0, 0, 0.6);
}

#colorlib-aside .colorlib-footer ul {
  padding: 0;
  margin: 0 0 20px 0;
  list-style: none;
}

#colorlib-aside .colorlib-footer ul li {
  display: inline-block;
  margin-left: 12px;
  list-style: none;
}

#colorlib-aside .colorlib-footer ul li a {
  display: inline-flex;
  color: #000;
  opacity: 0.75;
  transition: opacity 0.25s var(--nav-ease), color 0.25s var(--nav-ease);
}

#colorlib-aside .colorlib-footer ul li a:hover,
#colorlib-aside .colorlib-footer ul li a:focus {
  color: var(--nav-accent);
  opacity: 1;
}

/* -------------------------------------------------------------------------
 * 3. Content column (desktop)
 * ---------------------------------------------------------------------- */
#colorlib-main {
  width: 80%;
  float: right;
}

@media screen and (max-width: 1200px) {
  #colorlib-main { width: 70%; }
}

/* -------------------------------------------------------------------------
 * 4. Mobile top bar
 *
 * Only rendered below the breakpoint. It holds the logo and the hamburger
 * so that the panel underneath has nothing pinned to it and can animate
 * its own height freely.
 * ---------------------------------------------------------------------- */
.site-bar {
  display: none; /* desktop */
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1002;
  height: var(--nav-bar-height);
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  background: rgba(255, 255, 255, 0.95);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  box-shadow: 0 1px 10px rgba(0, 0, 0, 0.08);
}

.site-bar__logo {
  display: inline-block;
  padding: 5px 9px;
  font-size: 13px;
  line-height: 1.15;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: #fff;
  background: #000;
  text-decoration: none;
}

.site-bar__logo span {
  display: block;
}

/* -------------------------------------------------------------------------
 * 5. Hamburger
 * ---------------------------------------------------------------------- */
.colorlib-nav-toggle {
  display: none; /* desktop */
  position: relative;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.colorlib-nav-toggle i,
.colorlib-nav-toggle i::before,
.colorlib-nav-toggle i::after {
  position: absolute;
  left: 50%;
  width: 26px;
  height: 2px;
  margin-left: -13px;
  background: #000;
  transition: transform 0.35s var(--nav-ease),
              background 0.2s linear,
              top 0.35s var(--nav-ease);
}

.colorlib-nav-toggle i {
  top: 50%;
  margin-top: -1px;
  display: block;
}

.colorlib-nav-toggle i::before,
.colorlib-nav-toggle i::after {
  content: '';
  margin-left: -13px;
}

.colorlib-nav-toggle i::before { top: -8px; }
.colorlib-nav-toggle i::after  { top: 8px; }

.colorlib-nav-toggle.active i {
  background: transparent;
}

.colorlib-nav-toggle.active i::before {
  top: 0;
  transform: rotate(45deg);
}

.colorlib-nav-toggle.active i::after {
  top: 0;
  transform: rotate(-45deg);
}

/* -------------------------------------------------------------------------
 * 6. Mobile layout — the drop-down panel
 * ---------------------------------------------------------------------- */
@media screen and (max-width: 768px) {

  .site-bar,
  .colorlib-nav-toggle {
    display: flex;
  }

  #colorlib-main {
    width: 100%;
    float: none;
    padding-top: var(--nav-bar-height);
  }

  #colorlib-aside {
    /* Anchored under the bar and revealed by growing its height, so the
       menu unfolds downward. The old rule translated it in from
       `translateX(-270px)`; that is what made the panel arrive from the
       side and drag the page with it. */
    top: var(--nav-bar-height);
    bottom: auto;
    left: 0;
    right: 0;
    width: 100%;
    transform: none;
    z-index: 1001;

    max-height: 0;
    padding: 0 24px;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.09);
    transition: max-height 0.42s var(--nav-ease),
                padding 0.42s var(--nav-ease),
                opacity 0.28s var(--nav-ease),
                visibility 0s linear 0.42s;
  }

  /* `body.offcanvas` is the open state, kept from the original markup so
     the class name in site.js stays meaningful. */
  body.offcanvas #colorlib-aside {
    max-height: calc(100vh - var(--nav-bar-height));
    padding: 24px 24px 32px;
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
    transition: max-height 0.45s var(--nav-ease),
                padding 0.45s var(--nav-ease),
                opacity 0.28s var(--nav-ease) 0.05s,
                visibility 0s linear 0s;
  }

  /* The panel has its own bar, so the sidebar's desktop logo is redundant. */
  #colorlib-aside #colorlib-logo {
    display: none;
  }

  /* Left-align the menu on mobile: right-aligned text next to a
     left-aligned hamburger reads as two unrelated elements. */
  #colorlib-aside #colorlib-main-menu ul,
  #colorlib-aside .colorlib-footer {
    text-align: left;
  }

  /* The panel's height is animated, so the footer has to sit in normal
     flow here — absolutely positioning it against a collapsing box would
     leave it floating over the menu items mid-transition. */
  #colorlib-aside .colorlib-footer {
    position: relative;
    bottom: auto;
    left: auto;
    right: auto;
    padding: 0;
  }

  #colorlib-aside #colorlib-main-menu {
    margin-bottom: 1.5em;
  }

  #colorlib-aside #colorlib-main-menu ul li {
    margin-bottom: 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.07);

    /* Staggered lift-in, same timing as the case-study nav. */
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.3s var(--nav-ease),
                transform 0.3s var(--nav-ease);
  }

  #colorlib-aside #colorlib-main-menu ul li:last-child {
    border-bottom: 0;
  }

  body.offcanvas #colorlib-aside #colorlib-main-menu ul li {
    opacity: 1;
    transform: translateY(0);
  }

  body.offcanvas #colorlib-aside #colorlib-main-menu ul li:nth-child(1) { transition-delay: 0.10s; }
  body.offcanvas #colorlib-aside #colorlib-main-menu ul li:nth-child(2) { transition-delay: 0.16s; }
  body.offcanvas #colorlib-aside #colorlib-main-menu ul li:nth-child(3) { transition-delay: 0.22s; }
  body.offcanvas #colorlib-aside #colorlib-main-menu ul li:nth-child(4) { transition-delay: 0.28s; }

  #colorlib-aside #colorlib-main-menu ul li a {
    display: block;
    padding: 15px 0;
    font-size: 15px;
  }

  #colorlib-aside #colorlib-main-menu ul li a::after {
    display: none;
  }

  #colorlib-aside .colorlib-footer ul li {
    margin: 0 18px 0 0;
  }

  #colorlib-aside .colorlib-footer ul li a {
    /* Pad the social icons out to a proper touch target. */
    padding: 8px 0;
  }
}

/* -------------------------------------------------------------------------
 * 7. Accessibility
 * ---------------------------------------------------------------------- */
#colorlib-aside a:focus-visible,
.site-bar a:focus-visible,
.colorlib-nav-toggle:focus-visible {
  outline: 2px solid var(--nav-accent);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  #colorlib-aside,
  #colorlib-aside #colorlib-main-menu ul li,
  .colorlib-nav-toggle i,
  .colorlib-nav-toggle i::before,
  .colorlib-nav-toggle i::after {
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
}