/* InstruMentor — Layout: reset, body, sidebar, topbar, main */

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  background-image: radial-gradient(circle at 20% 80%, rgba(118,215,196,0.08) 0%, transparent 50%),
                     radial-gradient(circle at 80% 20%, rgba(93,173,226,0.06) 0%, transparent 50%);
  color: var(--text-iron);
  line-height: var(--lh-body);
  font-size: 16px;
  font-weight: 400;
}
.layout { display: flex; min-height: 100vh; }

/* SIDEBAR — Casa Batlló organic form */
.sidebar {
  width: 300px; min-width: 300px;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-mid) 100%);
  color: #fff;
  position: fixed; top: 0; left: 0; height: 100vh;
  overflow-y: auto; z-index: 100;
  transition: transform 0.3s ease; padding-bottom: 2rem;
  border-radius: 0 60px 120px 0 / 0 180px 250px 0;
  box-shadow: 10px 0 30px rgba(11, 61, 79, 0.25);
  border-right: 3px solid var(--accent);
}
.sidebar.collapsed { transform: translateX(-300px); }
.sidebar.collapsed + .main .hero,
.sidebar.collapsed + .main .hero-wave,
.sidebar.collapsed + .main .hero-texture { margin-left: 0; width: 100%; }
.sidebar.collapsed + .main .hero { padding-left: 2rem; }
.sidebar-header { padding: 1.5rem; border-bottom: 1px solid rgba(118,215,196,0.2); text-align: center; }
.sidebar-header h1 {
  font-family: var(--font-display);
  font-size: 1.6rem; font-weight: 700; letter-spacing: 0; text-transform: none;
  color: var(--accent); margin-bottom: 0.25rem;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.15);
}
.sidebar-header p { font-size: 0.8rem; opacity: 0.85; font-style: italic; }
.sidebar-header .instrument-badge {
  display: inline-block; margin-top: 0.5rem; padding: 0.25rem 0.8rem;
  background: rgba(41,128,185,0.2); border: 1px solid rgba(41,128,185,0.4);
  border-radius: 20px; font-size: 0.75rem; font-family: var(--font-mono);
  letter-spacing: 1px; text-transform: uppercase; color: #85c1e9;
}
.nav-section { padding: 0.25rem 0; }
.nav-section-title {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.65rem 1.25rem 0.35rem; font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 2px; color: rgba(118,215,196,0.85); cursor: pointer; user-select: none;
  font-family: var(--font-mono); font-weight: 500;
}
.nav-section-title:hover { background: rgba(255,255,255,0.05); }
.nav-section-title .arrow { transition: transform 0.2s; font-size: 0.6rem; }
.nav-section-title.open .arrow { transform: rotate(90deg); }
.nav-links { display: none; padding-bottom: 0.25rem; }
.nav-links.open { display: block; }
.nav-links a {
  display: block; padding: 0.25rem 1.25rem 0.25rem 2rem;
  color: rgba(255,255,255,0.85); text-decoration: none; font-size: 0.78rem;
  font-family: var(--font-sans);
  border-left: 3px solid transparent; transition: all 0.15s;
  letter-spacing: 0.2px; border-radius: 0 20px 20px 0; margin-right: 0.5rem;
}
.nav-links a:hover { background: rgba(255,255,255,0.06); color: #fff; border-left-color: var(--accent); }
.nav-links a.active { background: rgba(118,215,196,0.1); color: var(--accent); border-left-color: var(--accent); }
.nav-family-divider {
  height: 1px;
  margin: 0.4rem 1.25rem 0.4rem 2rem;
  background: rgba(118,215,196,0.15);
}
.back-link {
  display: block; padding: 0.6rem 1.25rem; font-size: 0.82rem;
  color: rgba(255,255,255,0.8); text-decoration: none;
  border-bottom: 1px solid rgba(118,215,196,0.15);
  transition: all 0.15s; font-family: var(--font-sans);
}
.back-link:hover { color: #fff; background: rgba(255,255,255,0.05); }

/* SIDEBAR FAMILY DOTS */
.nav-family-dot {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  margin-right: 0.45rem; flex-shrink: 0;
}
.nav-family-dot.ww { background: var(--family-woodwind); }
.nav-family-dot.br { background: var(--family-brass); }
.nav-family-dot.pc { background: var(--family-percussion); }
.nav-family-dot.st { background: var(--family-strings); }

/* MAIN */
.main { margin-left: 300px; flex: 1; transition: margin-left 0.3s ease; position: relative; }
.sidebar.collapsed + .main { margin-left: 0; }

/* SIDEBAR SEARCH — replaces former topbar search */
.sidebar-search { margin-top: 0.75rem; position: relative; }
.sidebar-search input {
  width: 100%; padding: 0.5rem 1rem 0.5rem 2.2rem;
  border: 1px solid rgba(255,255,255,0.3); border-radius: 20px;
  font-size: 0.82rem; font-family: var(--font-sans);
  background: rgba(255,255,255,0.08); color: #fff;
  transition: border-color 0.3s, background 0.3s;
}
.sidebar-search input::placeholder { color: rgba(255,255,255,0.65); }
.sidebar-search input:focus {
  outline: none; border-color: var(--accent);
  background: rgba(255,255,255,0.12);
}
.sidebar-search input:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
.sidebar-search::before {
  content: '\1F50D'; position: absolute; left: 0.65rem; top: 50%;
  transform: translateY(-50%); font-size: 0.75rem; opacity: 0.6;
}
.search-results-count {
  display: block; font-size: 0.7rem; color: rgba(255,255,255,0.75);
  text-align: center; margin-top: 0.25rem; font-family: var(--font-sans);
}

/* MENU TOGGLE — mobile only, floats over content */
.menu-toggle {
  display: none; position: fixed; top: 0.75rem; left: 0.75rem; z-index: 90;
  background: var(--primary); color: #fff; border: none;
  width: 2.5rem; height: 2.5rem; border-radius: 50%;
  font-size: 1.2rem; cursor: pointer;
  box-shadow: 0 2px 8px rgba(11,61,79,0.3);
  transition: background 0.2s;
}
.menu-toggle:hover { background: var(--primary-mid); }

.content { max-width: 700px; margin: 0 auto; padding: 0 2.5rem 5rem; }

/* PROGRESS BAR — Casa Batlló vine */
.progress-bar {
  position: fixed; top: 0; left: 300px; right: 0; height: 6px;
  background: transparent; z-index: 999; transition: left 0.3s;
  overflow: hidden;
}
.progress-bar svg { width: 100%; height: 100%; }
.vine-path {
  fill: none; stroke: url(#vineGradient); stroke-width: 6;
  stroke-dasharray: 1000; stroke-dashoffset: 1000; stroke-linecap: round;
  transition: stroke-dashoffset 0.1s;
}

/* FOOTER */
.footer {
  text-align: center; padding: 2rem; border-top: 1px solid var(--border);
  font-size: 0.85rem; color: var(--text-light);
  font-family: var(--font-sans);
}

/* BREADCRUMB — auto-generated navigation trail */
.breadcrumb { margin-bottom: 1.25rem; }
.breadcrumb ol {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem;
  list-style: none; padding: 0.5rem 0.85rem;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 30px 50px 50px 30px; font-size: 0.78rem;
  font-family: var(--font-mono); letter-spacing: 0.3px;
  box-shadow: 0 1px 4px rgba(11,61,79,0.05);
}
.breadcrumb li { color: var(--text-light); }
.breadcrumb li + li::before { content: '\203A'; margin: 0 0.35rem; color: var(--border); font-size: 1rem; }
.breadcrumb a { color: var(--primary-mid); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); text-decoration: underline; }
.breadcrumb [aria-current] { color: var(--primary); font-weight: 600; }

/* EXPAND / COLLAPSE CONTROLS */
.expand-controls {
  display: flex; gap: 0.5rem; justify-content: flex-end; margin-bottom: 1rem;
}
.expand-controls button {
  padding: 0.35rem 0.85rem; border: 1px solid var(--border);
  border-radius: 20px; background: var(--card); color: var(--text-light);
  font-family: var(--font-sans); font-size: 0.78rem; cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.expand-controls button:hover {
  background: var(--primary); color: #fff; border-color: var(--primary);
}

/* SKIP LINK — hidden until focused */
.skip-link {
  position: absolute; top: -999px; left: 0.5rem; z-index: 9999;
  background: var(--accent); color: var(--primary); padding: 0.5rem 1rem;
  border-radius: 0 0 8px 8px; font-family: var(--font-sans);
  font-size: 0.85rem; font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 0; }

/* ACCESSIBILITY — visible focus indicators for keyboard users */
a:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px;
}
.nav-links a:focus-visible {
  outline-color: var(--accent); background: rgba(255,255,255,0.1);
}
.menu-toggle:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px;
}