/* ===========================
   INSTRUCTIONS PAGE STYLES
=========================== */

/* Active nav link */
.active-nav {
  color: var(--orange) !important;
}
.active-nav::after {
  transform: scaleX(1) !important;
}

/* ===========================
   PAGE HERO
=========================== */
.instr-hero {
  padding: 120px 0 60px;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.instr-hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, var(--orange-glow) 0%, transparent 50%),
    radial-gradient(circle at 20% 80%, var(--olive-glow) 0%, transparent 50%);
  pointer-events: none;
}

.instr-hero-inner {
  position: relative;
  z-index: 1;
}

.instr-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 20px;
}

.instr-breadcrumb a {
  color: var(--orange);
  font-weight: 500;
  transition: opacity var(--transition);
}

.instr-breadcrumb a:hover { opacity: 0.75; }
.instr-breadcrumb span:last-child { color: var(--text-dark); font-weight: 600; }

.instr-hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 900;
  color: var(--text-dark);
  line-height: 1.1;
  margin-bottom: 16px;
}

.instr-hero-desc {
  font-size: 1.1rem;
  color: var(--text-light);
  line-height: 1.75;
  max-width: 560px;
  margin-bottom: 36px;
}

.instr-hero-meta {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

.instr-meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-mid);
  background: white;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  padding: 8px 18px;
  box-shadow: var(--shadow-sm);
}

.instr-meta-icon { font-size: 1.1rem; }

/* ===========================
   TABS
=========================== */
.instr-tabs-wrap {
  background: white;
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 72px;
  z-index: 900;
  box-shadow: var(--shadow-sm);
}

.instr-tabs {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.instr-tabs::-webkit-scrollbar { display: none; }

.instr-tab {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 32px;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  flex-shrink: 0;
  position: relative;
  top: 2px;
  text-align: left;
}

.instr-tab:hover {
  background: var(--off-white);
}

.instr-tab.active {
  border-bottom-color: var(--orange);
  background: var(--off-white);
}

.instr-tab-num {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--text-light);
  transition: color var(--transition);
  line-height: 1;
}

.instr-tab.active .instr-tab-num {
  color: var(--orange);
}

.instr-tab-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.instr-tab-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1;
}

.instr-tab-sub {
  font-size: 0.75rem;
  color: var(--text-light);
}

/* ===========================
   MAIN CONTENT
=========================== */
.instr-main {
  padding: 64px 0 100px;
  background: var(--off-white);
  min-height: 60vh;
}

/* ===========================
   PREREQ SECTION
=========================== */
.instr-prereq {
  margin-bottom: 56px;
}

.instr-prereq-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.prereq-card {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.safety-card {
  border-color: var(--orange-light);
  background: linear-gradient(135deg, white, #fffaf6);
}

.prereq-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1.5px solid var(--border);
}

.prereq-icon {
  font-size: 1.6rem;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--orange-glow);
  border: 1px solid var(--orange-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.safety-card .prereq-icon {
  background: #fff4e6;
  border-color: #ffcc80;
}

.prereq-card-header h2 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-dark);
}

.prereq-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.prereq-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.prereq-check {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--olive-glow);
  border: 1.5px solid var(--olive-light);
  color: var(--olive-dark);
  font-size: 0.75rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.prereq-check.optional {
  background: var(--light-gray);
  border-color: var(--border);
  color: var(--text-light);
}

.prereq-check.warn {
  background: #fff4e6;
  border-color: #ffcc80;
  color: #c47800;
  font-style: normal;
}

.prereq-list li > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.prereq-list li strong {
  font-size: 0.9rem;
  color: var(--text-dark);
  font-weight: 700;
}

.prereq-list li span {
  font-size: 0.82rem;
  color: var(--text-light);
  line-height: 1.5;
}

.optional-label {
  color: var(--text-light) !important;
  font-style: italic;
}

.safety-tip-box {
  margin-top: 20px;
  padding: 14px 18px;
  background: linear-gradient(135deg, #fff8f0, #fffdf5);
  border: 1.5px solid var(--orange-light);
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  color: var(--text-mid);
  line-height: 1.6;
}

/* ===========================
   PANEL HEADER
=========================== */
.instr-panel { display: none; }
.instr-panel.active { display: block; }

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  margin-bottom: 40px;
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  flex-wrap: wrap;
}

.panel-version-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1.5px solid;
  margin-bottom: 10px;
}

.panel-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 900;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.panel-desc {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.7;
  max-width: 480px;
}

.panel-header-right {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-end;
  flex-shrink: 0;
}

.panel-stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.panel-stat {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-mid);
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px 14px;
}

/* ===========================
   KIT CONTENTS
=========================== */
.instr-kit-contents {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 48px;
  box-shadow: var(--shadow-sm);
}

.instr-section-label {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
  margin-bottom: 20px;
}

.kit-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.kit-item {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.82rem;
  color: var(--text-mid);
  transition: border-color var(--transition), background var(--transition);
}

.kit-item:hover {
  border-color: var(--olive-light);
  background: var(--olive-glow);
}

.kit-qty {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--orange);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ===========================
   STEPS
=========================== */
.instr-steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
}

.instr-steps::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 48px;
  bottom: 48px;
  width: 2px;
  background: linear-gradient(to bottom, var(--orange-light), var(--olive-light));
  border-radius: 2px;
}

.instr-step {
  display: flex;
  gap: 28px;
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.instr-step:hover {
  border-color: var(--orange-light);
  box-shadow: var(--shadow-md);
}

.instr-step-done {
  border-color: var(--olive-light);
  background: linear-gradient(135deg, white, #f8faf0);
}

.instr-step-done:hover {
  border-color: var(--olive);
  box-shadow: var(--shadow-olive);
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-orange);
  color: white;
  font-family: 'Outfit', sans-serif;
  font-size: 1.2rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-orange);
  position: relative;
  z-index: 1;
}

.step-num-done {
  background: var(--gradient-olive) !important;
  box-shadow: var(--shadow-olive) !important;
  font-size: 1.1rem;
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-content h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.step-content p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.75;
  margin-bottom: 16px;
}

.step-content p:last-child {
  margin-bottom: 0;
}

/* Step Tip */
.step-tip {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: linear-gradient(135deg, #fffdf0, #fff8e0);
  border: 1.5px solid #ffe080;
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin: 16px 0;
  font-size: 0.86rem;
  color: #7a6010;
  line-height: 1.6;
}

.step-tip-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }

/* Step Warning */
.step-warning {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: #fff4f0;
  border: 1.5px solid #ffb080;
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin: 16px 0;
  font-size: 0.86rem;
  color: #8a3000;
  line-height: 1.6;
}

.step-warning > span:first-child { font-size: 1rem; flex-shrink: 0; }

/* Step Code Block */
.step-code-block {
  background: #1e1e2e;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 16px 0;
  border: 1px solid #2e2e3e;
}

.step-code-label {
  background: #2a2a3e;
  padding: 8px 16px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  border-bottom: 1px solid #3a3a4e;
}

.step-code-block pre {
  margin: 0;
  padding: 16px 20px;
  overflow-x: auto;
}

.step-code-block code {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.82rem;
  color: #a0d0a0;
  line-height: 1.8;
  white-space: pre;
}

/* Step Table */
.step-table {
  margin: 16px 0;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border);
}

.step-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.step-table thead tr {
  background: var(--gradient-dark);
  color: white;
}

.step-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.step-table td {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  color: var(--text-mid);
}

.step-table td:first-child {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--orange);
  font-weight: 600;
}

.step-table tbody tr:hover {
  background: var(--off-white);
}

/* Step Diagram */
.step-diagram {
  margin: 16px 0;
}

.diagram-box {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--off-white);
}

.diagram-label {
  padding: 8px 16px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  background: white;
  border-bottom: 1px solid var(--border);
}

.diagram-content {
  padding: 24px;
}

.diagram-pcb {
  background: #1a3a1a;
  border-radius: var(--radius-md);
  height: 180px;
  position: relative;
  border: 2px solid #2a5a2a;
}

.diagram-component {
  position: absolute;
  background: rgba(160,175,71,0.85);
  border: 1px solid var(--olive);
  border-radius: 4px;
  padding: 6px 10px;
  font-size: 0.65rem;
  font-weight: 700;
  color: white;
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.3;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

.diagram-component.dac { background: rgba(255,107,26,0.85); border-color: var(--orange); }
.diagram-component.oled { background: rgba(80,80,200,0.85); border-color: #8080e0; }
.diagram-component.esp { background: rgba(40,120,40,0.85); border-color: #60c060; }

/* Step Checklist */
.step-checklist {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
  padding: 16px;
  background: var(--off-white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
}

.step-check-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.86rem;
  color: var(--text-mid);
  cursor: pointer;
  transition: color var(--transition);
  user-select: none;
}

.step-check-item:hover { color: var(--text-dark); }

.step-check-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--olive);
  cursor: pointer;
  flex-shrink: 0;
}

.step-check-item:has(input:checked) {
  color: var(--text-light);
  text-decoration: line-through;
  text-decoration-color: var(--olive-light);
}

/* Step Done Box */
.step-done-box {
  background: linear-gradient(135deg, #f6faec, #fff8f0);
  border: 1.5px solid var(--olive-light);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.step-done-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.step-done-next {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.step-done-next > span {
  font-size: 0.86rem;
  color: var(--text-light);
}

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 1024px) {
  .kit-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .instr-prereq-inner { grid-template-columns: 1fr; }
  .kit-grid { grid-template-columns: repeat(2, 1fr); }
  .panel-header { flex-direction: column; }
  .panel-header-right { align-items: flex-start; }
  .panel-stats { justify-content: flex-start; }
  .instr-steps::before { display: none; }
  .instr-step { flex-direction: column; gap: 16px; }
  .step-done-box { flex-direction: column; }
  .instr-tab { padding: 14px 20px; }
  .instr-hero-meta { gap: 10px; }
}

@media (max-width: 480px) {
  .kit-grid { grid-template-columns: 1fr 1fr; }
  .instr-hero-title { font-size: 2rem; }
}