/* ═══════════════════════════════════════════════════════════
   C:Math Design System — Based on DESIGN_SPEC v1.0
   ═══════════════════════════════════════════════════════════ */

/* ─── CSS Variables ─── */
:root {
  --bg: #ffffff;
  --surface: #f7f8fa;
  --border: #e2e5ea;
  --primary: #4396F7;
  --primary-hover: #2b7de0;
  --green: #1a8c4e;
  --red: #d42b2b;
  --amber: #b8860b;
  --text: #111111;
  --text-secondary: #5a5f66;
}

[data-theme="dark"] {
  --bg: #111117;
  --surface: #1a1a24;
  --border: #2a2a38;
  --primary: #f0943a;
  --primary-hover: #e07e28;
  --green: #34d399;
  --red: #f87171;
  --amber: #fbbf24;
  --text: #e8e8ed;
  --text-secondary: #8b8b9a;
}

/* ─── Reset ─── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; }

/* ─── Base ─── */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  background: transparent;
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

html {
  background: var(--bg);
}

/* ─── Header ─── */
header {
  width: 100%;
  position: relative;
  z-index: 1;
}

.nav-bar {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 1rem 1.5rem;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text);
  margin: 0;
}
.nav-logo span { color: var(--primary); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: .4rem;
}

.nav-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  cursor: pointer;
  color: var(--text-secondary);
  transition: border-color .2s ease, color .2s ease;
  padding: 0;
}
.nav-btn:hover { border-color: var(--primary); color: var(--primary); }
.nav-btn svg { width: 16px; height: 16px; }

.nav-cta {
  height: 34px;
  line-height: 34px;
  padding: 0 1rem;
  background: var(--bg);
  color: var(--text);
  font-size: .75rem;
  font-weight: 600;
  text-decoration: none;
  font-family: inherit;
  letter-spacing: .02em;
  transition: border-color .25s ease, box-shadow .25s ease, color .25s ease;
  white-space: nowrap;
  border: 1px solid var(--border);
  cursor: pointer;
}
.nav-cta:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
  color: var(--primary);
}

.nav-lang-wrap { position: relative; }

.nav-lang-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: .3rem;
  background: var(--bg);
  border: 1px solid var(--border);
  z-index: 300;
  min-width: 120px;
  box-shadow: 0 4px 12px rgba(0,0,0,.08);
}
[data-theme="dark"] .nav-lang-menu { box-shadow: 0 4px 12px rgba(0,0,0,.3); }
.nav-lang-menu.open { display: block; }
.nav-lang-menu button {
  display: block;
  width: 100%;
  padding: .5rem .8rem;
  border: none;
  background: none;
  text-align: left;
  font-size: .75rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  transition: background .15s ease;
}
.nav-lang-menu button:hover { background: var(--surface); }
.nav-lang-menu button.active { color: var(--primary); font-weight: 600; }

/* ─── Container ─── */
.container {
  max-width: 960px;
  width: 100%;
  padding: 2rem 1.5rem;
  margin: 0 auto;
  flex: 1;
  position: relative;
  z-index: 1;
}

/* ─── Section ─── */
.section { margin-bottom: 1.5rem; margin-top: 1rem; }

.section-label {
  font-size: .65rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* ─── Hero ─── */
.hero {
  text-align: center;
  padding: 0.5rem 0 1.5rem;
  animation: slideUp .4s cubic-bezier(.4,0,.2,1);
}

.hero.hero-logged {
  text-align: left;
  padding: 0.5rem 0 1rem;
}
.hero.hero-logged .hero-title {
  font-size: 2.4rem;
}
.hero.hero-logged .hero-auth {
  justify-content: flex-start;
  align-items: center;
}

.hero-welcome {
  font-size: .85rem;
  font-weight: 600;
  color: var(--text);
}

.hero-logout-btn {
  height: 32px;
  padding: 0 1rem;
  font-size: .75rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: border-color .25s ease, color .25s ease;
}
.hero-logout-btn:hover {
  border-color: var(--red);
  color: var(--red);
}

.hero-badge {
  display: inline-block;
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--primary);
  border: 1px solid var(--primary);
  padding: .25rem .8rem;
  margin-bottom: 1.2rem;
}

.hero-title {
  font-size: 3.6rem;
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1.1;
  margin-bottom: .8rem;
  color: var(--text);
}
.hero-title span { color: var(--primary); }

.hero-desc {
  font-size: .95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 480px;
  margin: 0 auto;
  font-weight: 400;
}

.hero-auth {
  display: flex;
  justify-content: center;
  gap: .6rem;
  margin-top: 1rem;
}

.hero-auth-btn {
  height: 42px;
  padding: 0 2rem;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: .02em;
  transition: border-color .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease;
}

.hero-auth-btn.primary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}
.hero-auth-btn.primary:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
  color: var(--primary);
}

.hero-auth-btn.secondary {
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
}
.hero-auth-btn.secondary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  box-shadow: none;
  color: #fff;
}

/* ─── Services Grid ─── */
.services-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: .75rem;
}

/* ─── Dashboard Panel ─── */
.dashboard-panel {
  padding: 0;
  margin-bottom: .75rem;
  animation: slideUp .4s cubic-bezier(.4,0,.2,1);
  min-height: 200px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: .75rem;
}

.dash-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .8rem;
  padding: 1.5rem;
  border: none;
  background: none;
}

.dash-logo {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -.04em;
  color: var(--text);
}
.dash-logo span { color: var(--primary); }

.dash-logout-btn {
  height: 32px;
  padding: 0 1.2rem;
  font-size: .72rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  background: none;
  border: none;
  color: var(--text-secondary);
  transition: color .25s ease;
}
.dash-logout-btn:hover {
  color: var(--red);
}

.dash-right {
  grid-column: 2 / 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 1.2rem 1.5rem 1.5rem;
  border: 2px solid var(--border);
  background: rgba(255,255,255,.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
[data-theme="dark"] .dash-right {
  background: rgba(26,26,36,.5);
}

.dash-welcome {
  font-size: .85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 1.2rem;
  align-self: flex-start;
}

.dash-stats {
  display: flex;
  flex-direction: row;
  gap: 2rem;
  justify-content: center;
  flex: 1;
  align-items: center;
}

.dash-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
}

.dash-gauge {
  width: 72px;
  height: 72px;
  position: relative;
  margin-bottom: .4rem;
}

.dash-gauge svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.dash-gauge .gauge-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 3;
}

.dash-gauge .gauge-fill {
  fill: none;
  stroke: var(--primary);
  stroke-width: 3;
  stroke-linecap: round;
  transition: stroke-dashoffset .6s cubic-bezier(.4,0,.2,1);
}

.dash-gauge-val {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
  font-family: 'JetBrains Mono', monospace;
  font-variant-numeric: tabular-nums;
}

.dash-val {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.2;
}

.dash-label {
  font-size: .65rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-top: .2rem;
}

.dash-score {
  border-left: 1px solid var(--border);
  padding-left: 2rem;
  margin-left: .5rem;
  justify-content: center;
}

.dash-score-val {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  font-family: 'JetBrains Mono', monospace;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.service-card {
  position: relative;
  overflow: hidden;
  background: rgba(255,255,255,.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 2px solid var(--border);
  padding: 2rem 1.2rem;
  text-align: left;
  cursor: pointer;
  min-height: 140px;
  transition: border-color .25s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}
[data-theme="dark"] .service-card {
  background: rgba(26,26,36,.5);
}
.service-card:hover {
  border-color: var(--primary);
}

.service-card .sc-bg {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  display: block;
  width: 56px;
  height: 56px;
  opacity: .45;
  pointer-events: none;
  user-select: none;
  transition: opacity .25s ease;
}
.service-card .sc-bg svg {
  width: 100%;
  height: 100%;
  color: var(--text-secondary);
  transition: color .25s ease;
}
.service-card:hover .sc-bg { opacity: .6; }
.service-card:hover .sc-bg svg { color: var(--primary); }

.service-card .sc-title {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  position: relative;
  z-index: 1;
  color: var(--text);
  padding-right: 60px;
}

.service-card .sc-desc {
  display: block;
  font-size: .75rem;
  color: var(--text-secondary);
  font-weight: 400;
  position: relative;
  z-index: 1;
  margin-top: .3rem;
  line-height: 1.5;
  padding-right: 60px;
}

.service-card .sc-status {
  display: inline-block;
  font-size: .6rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: .15rem .5rem;
  margin-top: .6rem;
  position: relative;
  z-index: 1;
}
.sc-status.live { color: var(--green); border: 1px solid var(--green); }
.sc-status.down { color: var(--red); border: 1px solid var(--red); }
.sc-status.soon { color: var(--text-secondary); border: 1px solid var(--border); }

.service-card-disabled {
  cursor: default;
  background: rgba(247,248,250,.5);
}
[data-theme="dark"] .service-card-disabled {
  background: rgba(20,20,30,.5);
}
.service-card-disabled:hover {
  border-color: var(--border);
  box-shadow: none;
}
.service-card-disabled .sc-title { color: var(--text-secondary); }

/* ─── Features Grid ─── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .75rem;
}

.feature-card {
  border: 1px solid var(--border);
  padding: 1.4rem 1rem;
  text-align: center;
  transition: border-color .25s ease;
}
.feature-card:hover { border-color: var(--primary); }

.feature-icon {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: .5rem;
  font-family: 'JetBrains Mono', monospace;
  line-height: 1;
}

.feature-title {
  font-size: .82rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: .25rem;
}

.feature-desc {
  font-size: .72rem;
  color: var(--text-secondary);
  line-height: 1.5;
  font-weight: 400;
}

/* ─── How Steps ─── */
.how-steps {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.how-step {
  display: flex;
  gap: 1.2rem;
  align-items: flex-start;
  padding: 1.2rem;
  border: 1px solid var(--border);
  transition: border-color .25s ease;
}
.how-step:hover { border-color: var(--primary); }

.how-num {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  background: var(--primary);
  font-family: 'JetBrains Mono', monospace;
}

.how-text { flex: 1; }

.how-text h3 {
  font-size: .92rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: .25rem;
  letter-spacing: -.01em;
}

.how-text p {
  font-size: .8rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-weight: 400;
}

/* ─── CTA ─── */
.cta-section {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.cta-text {
  font-size: .92rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.7;
}

.cta-btn {
  display: inline-block;
  height: 44px;
  line-height: 44px;
  padding: 0 2.5rem;
  background: var(--bg);
  color: var(--text);
  font-size: .88rem;
  font-weight: 600;
  text-decoration: none;
  font-family: inherit;
  letter-spacing: .02em;
  border: 1px solid var(--border);
  transition: border-color .25s ease, box-shadow .25s ease, color .25s ease;
}
.cta-btn:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
  color: var(--primary);
}

/* ─── Footer ─── */
.site-footer {
  width: 100%;
  text-align: center;
  padding: .6rem 1rem .8rem;
  margin-top: auto;
  position: relative;
  z-index: 1;
}

.footer-text {
  font-size: .65rem;
  color: var(--text-secondary);
  letter-spacing: .04em;
}

/* ─── Settings Panel ─── */
.settings-panel {
  position: fixed;
  top: 0;
  right: -320px;
  z-index: 200;
  width: 300px;
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  padding: 2rem 1.5rem 3rem;
  overflow-y: auto;
  transition: right .3s cubic-bezier(.4,0,.2,1);
  box-shadow: -8px 0 32px rgba(0,0,0,.08);
}
.settings-panel.open { right: 0; }
[data-theme="dark"] .settings-panel {
  box-shadow: -8px 0 32px rgba(0,0,0,.4);
}

/* Settings panel buttons */
.btn-next {
  display: block; margin: 0 auto 1rem; background: var(--bg);
  border: 1px solid var(--border); padding: .7rem 2rem;
  color: var(--text); font-size: .82rem; font-weight: 500;
  cursor: pointer; font-family: inherit; letter-spacing: 0.02em;
  transition: border-color .2s ease, color .2s ease;
}
.btn-next:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { color: var(--text); border-color: var(--red); }
.btn-danger:hover { background: var(--red); color: #fff; border-color: var(--red); }

.settings-overlay {
  position: fixed;
  inset: 0;
  z-index: 199;
  background: rgba(0,0,0,.15);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}
.settings-overlay.open { opacity: 1; pointer-events: auto; }

.settings-panel h3 {
  font-size: .85rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.settings-panel .sp-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: .2rem;
  transition: color .2s ease;
}
.settings-panel .sp-close:hover { color: var(--text); }
.settings-panel .sp-close svg { width: 18px; height: 18px; }

.settings-panel .sp-section { margin-bottom: 1.5rem; }
.settings-panel .sp-label {
  font-size: .65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: .6rem;
}

.sp-colors { display: flex; flex-wrap: wrap; gap: .4rem; }
.sp-colors button {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: border-color .2s ease, transform .15s ease;
  padding: 0;
  background: none;
}
.sp-colors button:hover { transform: scale(1.1); }
.sp-colors button.active { border-color: var(--text); border-width: 3px; }

.sp-slider { margin-bottom: .3rem; }
.sp-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--border);
  outline: none;
  margin: .6rem 0 .3rem;
}
.sp-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--primary);
  border: none;
  cursor: pointer;
}
.sp-slider input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--primary);
  border: none;
  cursor: pointer;
}
.sp-slider-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .7rem;
  color: var(--text-secondary);
}
.sp-slider-info .sp-slider-val {
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ─── Search Overlay ─── */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(255,255,255,.95);
  display: none;
  flex-direction: column;
  align-items: center;
  padding-top: 12vh;
}
.search-overlay.open { display: flex; }
[data-theme="dark"] .search-overlay { background: rgba(17,17,23,.7); }

.search-modal {
  width: 90%;
  max-width: 520px;
  background: var(--bg);
  border: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0,0,0,.08);
  animation: slideUp .25s cubic-bezier(.4,0,.2,1);
}
[data-theme="dark"] .search-modal { box-shadow: 0 4px 24px rgba(0,0,0,.3); }

.search-input {
  width: 100%;
  height: 52px;
  border: none;
  background: transparent;
  padding: 0 1.2rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  outline: none;
  font-family: inherit;
  border-bottom: 1px solid var(--border);
}
.search-input::placeholder { color: var(--text-secondary); }

.search-results { max-height: 50vh; overflow-y: auto; }

/* ─── Mobile Sidebar ─── */
.nav-hamburger {
  display: none;
  width: 34px;
  height: 34px;
  background: var(--bg);
  border: 1px solid var(--border);
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0;
  align-items: center;
  justify-content: center;
  transition: border-color .2s ease, color .2s ease;
}
.nav-hamburger:hover { border-color: var(--primary); color: var(--primary); }
.nav-hamburger svg { width: 18px; height: 18px; }

.mobile-sidebar-overlay {
  position: fixed;
  inset: 0;
  z-index: 599;
  background: rgba(0,0,0,.3);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}
.mobile-sidebar-overlay.open { opacity: 1; pointer-events: auto; }

.mobile-sidebar {
  position: fixed;
  top: 0;
  right: -280px;
  z-index: 600;
  width: 260px;
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  padding: 0;
  overflow-y: auto;
  transition: right .3s cubic-bezier(.4,0,.2,1);
  box-shadow: -4px 0 24px rgba(0,0,0,.08);
  display: none;
}
.mobile-sidebar.open { right: 0; }
[data-theme="dark"] .mobile-sidebar { box-shadow: -4px 0 24px rgba(0,0,0,.4); }

.msb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--border);
}
.msb-header h2 {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text);
}
.msb-header h2 span { color: var(--primary); }

.msb-close {
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.msb-close:hover { color: var(--text); }
.msb-close svg { width: 18px; height: 18px; }

.msb-items { padding: .5rem 0; }
.msb-items button {
  display: flex;
  align-items: center;
  gap: .8rem;
  width: 100%;
  padding: .75rem 1.2rem;
  border: none;
  background: none;
  text-align: left;
  font-size: .82rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  transition: background .15s ease;
}
.msb-items button:hover { background: var(--surface); }
.msb-items button svg {
  width: 18px;
  height: 18px;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.msb-items button:hover svg { color: var(--primary); }

/* ─── Ad Rails (desktop 1100px+) ─── */
.ad-rail {
  position: fixed;
  top: 60px;
  width: 160px;
  height: calc(100vh - 60px);
  display: flex;
  align-items: flex-start;
  padding-top: 1rem;
  z-index: 10;
}
.ad-rail-left { left: 0; }
.ad-rail-right { right: 0; }
@media (max-width: 1100px) { .ad-rail { display: none; } }

/* ─── Auth Inline Page ─── */
.auth-page {
  animation: slideUp .4s cubic-bezier(.4,0,.2,1);
  text-align: center;
  padding-top: 0.5rem;
  max-width: 360px;
  margin: 0 auto;
}

.auth-page .auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
}
.auth-page .auth-tabs button {
  flex: 1;
  height: 38px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: .8rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: all .2s ease;
}
.auth-page .auth-tabs button.active {
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  border-color: var(--text);
}

.auth-page .auth-form {
  display: flex;
  flex-direction: column;
  gap: .6rem;
  text-align: left;
}

.auth-page .auth-form input,
.auth-page .auth-form select {
  width: 100%;
  height: 42px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0 1rem;
  font-size: .85rem;
  font-weight: 500;
  outline: none;
  font-family: 'Inter', sans-serif;
  transition: border-color .2s ease;
}
.auth-page .auth-form input:focus,
.auth-page .auth-form select:focus { border-color: var(--primary); }
.auth-page .auth-form input::placeholder { color: var(--text-secondary); font-weight: 400; }
.auth-page .auth-form select { color: var(--text-secondary); cursor: pointer; }

.auth-page .auth-btn {
  height: 42px;
  background: var(--primary);
  border: 1px solid var(--primary);
  color: #fff;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background .25s ease, border-color .25s ease;
  margin-top: .3rem;
}
.auth-page .auth-btn:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.auth-page .auth-btn-secondary {
  height: 42px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: .82rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: border-color .25s ease, box-shadow .25s ease, color .25s ease;
}
.auth-page .auth-btn-secondary:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
  color: var(--primary);
}

.auth-page .auth-error {
  font-size: .78rem;
  color: var(--red);
  font-weight: 500;
  text-align: left;
  display: none;
}

.auth-page .pw-rules { text-align: left; margin: -.2rem 0 .4rem; }
.auth-page .pw-rules .pw-rule {
  font-size: .72rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: .15rem 0;
  transition: color .2s ease;
}
.auth-page .pw-rules .pw-rule.pass { color: var(--green); }
.auth-page .pw-rules .pw-rule .pw-dot {
  width: 5px;
  height: 5px;
  border: 1px solid var(--text-secondary);
  flex-shrink: 0;
  transition: all .2s ease;
}
.auth-page .pw-rules .pw-rule.pass .pw-dot {
  background: var(--green);
  border-color: var(--green);
}

/* ─── Onboarding ─── */
.onboard-overlay {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,.45);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  opacity: 1;
  transition: opacity .4s ease;
}
[data-theme="dark"] .onboard-overlay {
  background: rgba(17,17,23,.45);
}
.onboard-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.onboard-content {
  max-width: 480px;
  width: 90%;
  text-align: center;
  animation: slideUp .5s cubic-bezier(.4,0,.2,1);
}

.onboard-brand {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -.04em;
  color: var(--text);
  margin-bottom: 2.5rem;
}
.onboard-brand span { color: var(--primary); }

.onboard-steps {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
  text-align: left;
}

.onboard-step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.onboard-num {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 800;
  color: #fff;
  background: var(--primary);
  font-family: 'JetBrains Mono', monospace;
}

.onboard-text h3 {
  font-size: .9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: .2rem;
  letter-spacing: -.01em;
}

.onboard-text p {
  font-size: .78rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-weight: 400;
}

.onboard-start {
  display: block;
  width: 100%;
  height: 46px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: .9rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: .02em;
  transition: border-color .25s ease, box-shadow .25s ease, color .25s ease;
}
.onboard-start:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
  color: var(--primary);
}

@media (max-width: 480px) {
  .onboard-brand { font-size: 2rem; margin-bottom: 2rem; }
  .onboard-steps { gap: 1.2rem; margin-bottom: 2rem; }
  .onboard-num { width: 30px; height: 30px; font-size: .85rem; }
  .onboard-text h3 { font-size: .82rem; }
  .onboard-text p { font-size: .72rem; }
  .onboard-start { height: 42px; font-size: .82rem; }
}

/* ─── Animations ─── */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}

/* ─── Responsive: Tablet ─── */
@media (max-width: 768px) {
  .nav-hamburger { display: none; }

  .nav-bar { padding: .8rem 1rem; }
  .nav-logo { font-size: 1.2rem; }
  .container { padding: 1.5rem 1rem; }

  .hero { padding: 2rem 0 2rem; }
  .hero-title { font-size: 2.8rem; }
  .hero-desc { font-size: .88rem; }

  .services-grid { grid-template-columns: 1fr 1fr 1fr; gap: .6rem; }
  .service-card { padding: 1.5rem 1rem; min-height: 120px; }
  .service-card .sc-bg { width: 44px; height: 44px; }

  .features-grid { grid-template-columns: repeat(3, 1fr); gap: .6rem; }
  .feature-card { padding: 1.2rem .8rem; }
  .feature-icon { font-size: 1.3rem; }
  .feature-title { font-size: .78rem; }
  .feature-desc { font-size: .68rem; }

  .how-step { padding: 1rem; }
  .how-num { width: 36px; height: 36px; font-size: 1rem; }
  .how-text h3 { font-size: .85rem; }
  .how-text p { font-size: .75rem; }

  .settings-panel { width: 280px; }
}

/* ─── Responsive: Mobile ─── */
@media (max-width: 480px) {
  .container { padding: 1rem .75rem; }

  .hero { padding: 1.5rem 0 1.5rem; }
  .hero-title { font-size: 2.2rem; }
  .hero.hero-logged .hero-title { font-size: 1.8rem; }
  .hero-desc { font-size: .82rem; }
  .hero-badge { font-size: .62rem; padding: .2rem .6rem; }

  .services-grid { grid-template-columns: 1fr 1fr; gap: .5rem; }
  .service-card { padding: 1.2rem 1rem; min-height: 100px; }
  .service-card .sc-bg { width: 38px; height: 38px; }
  .service-card .sc-title { font-size: .92rem; }

  .features-grid { grid-template-columns: 1fr 1fr 1fr; gap: .5rem; }
  .feature-card { padding: 1rem .6rem; }
  .feature-icon { font-size: 1.2rem; margin-bottom: .3rem; }
  .feature-title { font-size: .72rem; }
  .feature-desc { font-size: .65rem; }

  .how-step { padding: .8rem; gap: 1rem; }
  .how-num { width: 32px; height: 32px; font-size: .9rem; }
  .how-text h3 { font-size: .8rem; }
  .how-text p { font-size: .72rem; }

  .cta-text { font-size: .82rem; }
  .cta-btn { height: 40px; line-height: 40px; padding: 0 2rem; font-size: .82rem; }

  .nav-bar { padding: .6rem .75rem; }
  .nav-logo { font-size: 1.05rem; }
  .nav-hamburger { width: 30px; height: 30px; }
  .nav-hamburger svg { width: 16px; height: 16px; }
  .mobile-sidebar { width: 240px; right: -260px; }
  .settings-panel { width: 260px; padding: 1.5rem 1rem; }
}