:root {
  --bg: #f9fafb;
  --primary: #16a34a;
  --primary-dark: #15803d;
  --primary-light: #dcfce7;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --warning: #dc2626;
  --warning-light: #fee2e2;
  --text: #111827;
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  --border: #e5e7eb;
  --card: #ffffff;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius: 14px;
  --radius-sm: 8px;
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: "DM Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 15px;
}
h1,
h2,
h3,
h4 {
  font-family: "Syne", sans-serif;
}

/* ── HEADER ── */
header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 20px;
}
.header-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 62px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--card);
  border: #16a34a 2px solid;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.logo-text {
  font-family: "Syne", sans-serif;
  font-weight: 800;
  font-size: 18px;
  color: var(--text);
}
.logo-text span {
  color: var(--primary);
}
.search-wrap {
  flex: 1;
  position: relative;
  max-width: 520px;
}
.search-wrap input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  border: 2px solid var(--border);
  border-radius: 50px;
  font-family: inherit;
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.2s;
  outline: none;
}
.search-wrap input:focus {
  border-color: var(--primary);
  background: #fff;
}
.search-wrap .s-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 16px;
  pointer-events: none;
}
.search-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-height: 320px;
  overflow-y: auto;
  display: none;
  z-index: 200;
}
.search-dropdown.open {
  display: block;
}
.sd-item {
  padding: 11px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}
.sd-item:last-child {
  border-bottom: none;
}
.sd-item:hover {
  background: var(--primary-light);
}
.sd-item .cat-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 600;
  flex-shrink: 0;
}
.sd-item .diff-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
.saved-btn {
  padding: 8px 14px;
  border-radius: 50px;
  border: 1.5px solid var(--border);
  background: transparent;
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  transition: all 0.2s;
}
.saved-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── MAIN CONTAINER ── */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

/* ── VIEWS ── */
.view {
  display: none;
}
.view.active {
  display: block;
}

/* ── HOME VIEW ── */
.hero {
  padding: 36px 0 24px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 8px;
}
.hero h1 span {
  color: var(--primary);
}
.hero p {
  color: var(--text-muted);
  font-size: 15px;
  max-width: 420px;
  margin: 0 auto;
}

/* categories */
.section-title {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-title span {
  font-family: "DM Sans", sans-serif;
  font-weight: 400;
  font-size: 13px;
  color: var(--text-muted);
}
.categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}
.cat-card {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 14px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.cat-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(22, 163, 74, 0.12);
  transform: translateY(-2px);
}
.cat-card .cat-emoji {
  font-size: 28px;
  margin-bottom: 8px;
  display: block;
}
.cat-card .cat-name {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: 13px;
  color: var(--text);
}
.cat-card .cat-count {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 3px;
}

/* popular fixes */
.popular-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 32px;
}

.pop-card {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.pop-card:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}
.pop-icon {
  font-size: 22px;
  flex-shrink: 0;
}
.pop-info .pop-title {
  font-weight: 600;
  font-size: 13px;
  line-height: 1.3;
}
.pop-info .pop-meta {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
}
.diff-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 20px;
  flex-shrink: 0;
  margin-left: auto;
}
.diff-easy {
  background: #dcfce7;
  color: #15803d;
}
.diff-medium {
  background: #fef3c7;
  color: #b45309;
}
.diff-hard {
  background: #fee2e2;
  color: #dc2626;
}

/* recent */
.recent-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
}
.recent-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  transition: all 0.2s;
}
.recent-item:hover {
  border-color: var(--primary);
}
.recent-item .ri-icon {
  font-size: 18px;
}
.recent-item .ri-title {
  flex: 1;
  font-weight: 500;
}
.recent-item .ri-time {
  font-size: 12px;
  color: var(--text-muted);
}

/* ── CATEGORY VIEW ── */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  color: var(--text-muted);
  padding: 0;
  margin: 20px 0 16px;
  transition: color 0.2s;
}
.back-btn:hover {
  color: var(--primary);
}
.cat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.cat-header .big-emoji {
  font-size: 44px;
}
.cat-header h2 {
  font-size: 24px;
  font-weight: 800;
}
.cat-header p {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 4px;
}
.problem-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.problem-item {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: all 0.2s;
}
.problem-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateX(3px);
}
.problem-item .pi-icon {
  font-size: 24px;
  flex-shrink: 0;
}
.problem-item .pi-info {
  flex: 1;
}
.problem-item .pi-title {
  font-weight: 600;
  font-size: 15px;
}
.problem-item .pi-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.pi-arrow {
  color: var(--text-light);
  font-size: 18px;
}

/* ── GUIDE VIEW ── */
.guide-header {
  padding: 20px 0 0;
}
.guide-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 20px;
}
.meta-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px 14px;
  font-size: 13px;
}
.meta-chip .mc-label {
  color: var(--text-muted);
  font-size: 11px;
  margin-right: 2px;
}
.meta-chip .mc-val {
  font-weight: 600;
  padding-top: -0.2rem;
}

.warning-box {
  background: var(--warning-light);
  border: 1.5px solid #fecaca;
  border-left: 4px solid var(--warning);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 20px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.warning-box .wb-icon {
  font-size: 20px;
  flex-shrink: 0;
}
.warning-box .wb-text {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  color: #991b1b;
}

.tools-box {
  background: var(--accent-light);
  border: 1.5px solid #fde68a;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 24px;
}
.tools-box h4 {
  font-size: 13px;
  font-weight: 700;
  color: #92400e;
  margin-bottom: 8px;
  display: flex;
  gap: 6px;
}
.tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tool-tag {
  background: #fff;
  border: 1px solid #fde68a;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 13px;
  color: #78350f;
}

.steps-section h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 16px;
}
.step {
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  animation: fadeUp 0.3s ease both;
}
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.step-num {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}
.step-content {
  flex: 1;
}
.step-content p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}
.step-icon {
  font-size: 22px;
  flex-shrink: 0;
}
.step-warn {
  background: var(--warning-light);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin-top: 8px;
  font-size: 12px;
  color: #991b1b;
  display: flex;
  gap: 6px;
  align-items: center;
}

.stop-box {
  background: var(--warning-light);
  border: 2px solid var(--warning);
  border-radius: var(--radius);
  padding: 18px;
  margin: 24px 0;
  text-align: center;
}
.stop-box h4 {
  font-size: 16px;
  font-weight: 800;
  color: var(--warning);
  margin-bottom: 6px;
}
.stop-box p {
  font-size: 14px;
  color: #7f1d1d;
  margin-bottom: 14px;
}
.call-tech-btn {
  background: var(--warning);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 11px 24px;
  font-family: inherit;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.call-tech-btn:hover {
  background: #b91c1c;
  transform: scale(1.02);
}

.guide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.action-btn {
  border: 1.5px solid var(--border);
  background: var(--card);
  border-radius: 50px;
  padding: 10px 20px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 7px;
}
.action-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.action-btn.saved {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}
.action-btn.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.action-btn.primary:hover {
  background: var(--primary-dark);
}

/* ── DIAGNOSIS FLOW ── */
.diagnosis-box {
  background: var(--card);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 20px;
}
.diagnosis-box h3 {
  font-size: 16px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
}
.diagnosis-box p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.diag-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.diag-option {
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
}
.diag-option:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary-dark);
}
.diag-option .do-icon {
  font-size: 18px;
}

/* ── BOOKMARKS VIEW ── */
.empty-state {
  text-align: center;
  padding: 60px 0;
  color: var(--text-muted);
}
.empty-state .es-icon {
  font-size: 48px;
  margin-bottom: 12px;
}
.empty-state p {
  font-size: 14px;
}

/* ── TOAST ── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: #111827;
  color: #fff;
  padding: 11px 22px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  z-index: 9999;
  transition: transform 0.3s ease;
  pointer-events: none;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* ── FOOTER ── */
footer {
  background: var(--text);
  color: #fff;
  padding: 28px 20px;
  margin-top: 40px;
}
.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
  align-items: flex-start;
}
.footer-brand .logo-text {
  color: #fff;
  font-size: 16px;
}
.footer-brand .logo-text span {
  color: #4ade80;
}
.footer-brand p {
  font-size: 13px;
  color: #9ca3af;
  margin-top: 6px;
}
.footer-tips h2 {
  font-weight: 700;
  color: #d1fae5;
  margin-bottom: 8px;
}
.footer-tips ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-tips li {
  font-size: 12px;
  color: #9ca3af;
  display: flex;
  gap: 6px;
  align-items: flex-start;
}
.footer-note {
  font-size: 12px;
  color: #6b7280;
  border-top: 1px solid #374151;
  margin-top: 16px;
  padding-top: 14px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

/* responsive */
@media (max-width: 480px) {
  .header-inner {
    gap: 10px;
  }
  .saved-btn span {
    display: none;
  }
  .popular-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
  }
  .pop-card {
    width: 100vw;
  }
}