/* ─────────────────────────────────────────────────────────────────────────── *
 *  SessionBridge Landing Page                                                  *
 *  Design language: Apple-inspired — SF Pro/Inter, Action Blue, parchment,    *
 *  edge-to-edge tiles, pill CTAs, no drop-shadows, no gradients.              *
 * ─────────────────────────────────────────────────────────────────────────── */

/* ── Reset & tokens ──────────────────────────────────────────────────────── */

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

:root {
  /* Color */
  --blue:          #0066cc;
  --blue-dark:     #2997ff;   /* links on dark tiles */
  --ink:           #1d1d1f;
  --ink-muted:     #6e6e73;
  --body-muted:    #a1a1a6;   /* copy on dark */
  --canvas:        #ffffff;
  --parchment:     #f5f5f7;
  --tile-dark:     #1c1c1e;
  --tile-darker:   #000000;
  --hairline:      #d2d2d7;

  /* Type */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;

  /* Radius */
  --r-pill: 9999px;
  --r-card: 18px;
  --r-mode: 14px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--canvas);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

/* ── Nav ─────────────────────────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 245, 247, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  height: 52px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.2px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 28px;
  flex: 1;
}

.nav-links a {
  font-size: 13px;
  color: var(--ink-muted);
  text-decoration: none;
  letter-spacing: -0.1px;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--ink); }

/* ── Buttons ─────────────────────────────────────────────────────────────── */

.btn-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 400;
  text-decoration: none;
  transition: opacity 0.15s;
  white-space: nowrap;
  cursor: pointer;
}

.btn-pill:hover { opacity: 0.85; }
.btn-pill:active { transform: scale(0.97); }

.nav-cta {
  background: var(--blue);
  color: #fff;
  font-size: 13px;
  padding: 8px 18px;
  margin-left: auto;
}

.btn-pill-light {
  background: #fff;
  color: var(--ink);
}

.btn-pill-lg {
  font-size: 17px;
  padding: 14px 32px;
}

.btn-pill-ghost {
  display: inline-flex;
  align-items: center;
  font-size: 15px;
  color: var(--blue-dark);
  text-decoration: none;
  letter-spacing: -0.1px;
  transition: opacity 0.15s;
}

.btn-pill-ghost:hover { opacity: 0.75; }

/* ── Tiles ───────────────────────────────────────────────────────────────── */

.tile-dark    { background: var(--tile-dark); }
.tile-darker  { background: var(--tile-darker); }
.tile-parchment { background: var(--parchment); }
.tile-white   { background: var(--canvas); }

/* ── Section layout ──────────────────────────────────────────────────────── */

.section-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 96px 32px;
}

/* ── Typography ──────────────────────────────────────────────────────────── */

.label-caps {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 16px;
}

.label-caps--light { color: var(--blue-dark); }

.display-lg {
  font-size: clamp(34px, 5vw, 48px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.5px;
  color: var(--ink);
}

.display-lg--light { color: #fff; }

.display-md {
  font-size: clamp(28px, 3.5vw, 38px);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.4px;
  color: var(--ink);
  margin-bottom: 20px;
}

.display-md--light { color: #fff; }

.center-h { text-align: center; }

.body-copy {
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: -0.2px;
  color: var(--ink-muted);
  max-width: 460px;
}

.body-copy--light { color: var(--body-muted); }
.center-copy { text-align: center; margin: 0 auto 48px; max-width: 520px; }

/* ── Hero ────────────────────────────────────────────────────────────────── */

.hero { padding: 0; }

.hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 100px 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 56px;
}

.hero-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue-dark);
  margin-bottom: 24px;
}

.hero-display {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.5px;
  color: #fff;
  margin-bottom: 24px;
}

.hero-lead {
  font-size: 19px;
  line-height: 1.5;
  letter-spacing: -0.2px;
  color: var(--body-muted);
  max-width: 560px;
  margin-bottom: 40px;
}

.hero-lead--light { color: var(--body-muted); }

.hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  justify-content: flex-start;
}

.hero-footnote {
  font-size: 13px;
  color: #6e6e73;
  letter-spacing: -0.1px;
}

/* ── Extension panel mockup ──────────────────────────────────────────────── */

.hero-mockup {
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1200px;
}

.sb-panel {
  width: 268px;
  background: #f9f9fb;
  border-radius: 16px;
  overflow: hidden;
  /* One permitted product-image drop-shadow */
  box-shadow: 0 40px 100px rgba(0,0,0,0.55), 0 0 0 0.5px rgba(255,255,255,0.1);
  animation: sbFloat 5s ease-in-out infinite;
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

.sb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 14px 10px;
  background: #fff;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.sb-tl-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ff5f57;
  display: block;
  box-shadow: inset 0 0 0 0.5px rgba(0,0,0,0.15);
}

.sb-plan-chip {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: #f0f0f2;
  color: #6e6e73;
  padding: 3px 9px;
  border-radius: 9999px;
}

.sb-body {
  padding: 14px 14px 16px;
  background: #f9f9fb;
}

.sb-zone-lbl {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #a1a1a6;
  margin-bottom: 6px;
}

.sb-zone-lbl--mt { margin-top: 12px; }

.sb-provider-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 13px;
  border-radius: 9999px;
  background: #fff;
  border: 1px solid #e0e0e4;
  font-size: 12px;
  font-weight: 600;
  color: #1d1d1f;
  letter-spacing: -0.1px;
}

.sb-modes {
  display: flex;
  background: rgba(0,0,0,0.07);
  border-radius: 8px;
  padding: 2px;
  gap: 2px;
  margin-bottom: 11px;
  margin-top: 8px;
}

.sb-mode {
  flex: 1;
  text-align: center;
  font-size: 9px;
  font-weight: 500;
  padding: 4px 4px;
  border-radius: 6px;
  color: #8e8e93;
}

.sb-mode--active {
  background: #fff;
  color: #1d1d1f;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.sb-transfer-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sb-transfer-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 13px;
  border-radius: 10px;
  background: rgba(0,0,0,0.04);
  border: none;
  cursor: default;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  color: #1d1d1f;
  letter-spacing: -0.1px;
}

.sb-btn-arrow {
  color: #0066cc;
  font-size: 13px;
}

.sb-history-section {
  padding: 11px 14px 16px;
  background: #fff;
  border-top: 1px solid rgba(0,0,0,0.07);
}

.sb-h-title {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: #b0b0b5;
  margin-bottom: 10px;
}

.sb-h-card {
  background: #f9f9fb;
  border-radius: 10px;
  padding: 9px 11px;
  border: 1px solid #e8e8ec;
}

.sb-h-route {
  font-size: 11px;
  font-weight: 600;
  color: #1d1d1f;
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 3px;
  letter-spacing: -0.1px;
}

.sb-h-arrow { color: #0066cc; }

.sb-h-time {
  margin-left: auto;
  font-size: 10px;
  color: #a1a1a6;
  font-weight: 400;
}

.sb-h-goal {
  font-size: 11px;
  color: #6e6e73;
  line-height: 1.4;
  letter-spacing: -0.05px;
}

.sb-h-empty {
  font-size: 12px;
  color: #a1a1a6;
  text-align: center;
  padding: 4px 0 2px;
}

/* ── Problem / compare section ───────────────────────────────────────────── */

.problem-section .section-inner {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.problem-section .body-copy {
  max-width: 560px;
  margin-bottom: 52px;
}

.compare-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.compare-card {
  border-radius: var(--r-card);
  padding: 28px 28px 24px;
}

.compare-card--bad {
  background: #fff;
  border: 1px solid var(--hairline);
}

.compare-card--good {
  background: #fff;
  border: 2px solid var(--blue);
}

.compare-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 16px;
}

.compare-card--good .compare-label { color: var(--blue); }

.compare-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.compare-list li {
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: -0.1px;
  padding-left: 22px;
  position: relative;
}

.compare-list--bad li { color: var(--ink-muted); }
.compare-list--bad li::before {
  content: '·';
  position: absolute;
  left: 6px;
  color: #c0c0c5;
  font-weight: 700;
}

.compare-list--good li { color: var(--ink); font-weight: 500; }
.compare-list--good li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--blue);
  font-weight: 700;
}

.compare-time {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.1px;
  padding-top: 12px;
  border-top: 1px solid var(--hairline);
}

.compare-card--bad .compare-time { color: var(--ink-muted); }
.compare-card--good .compare-time { color: var(--blue); }

.compare-divider {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .compare-row {
    grid-template-columns: 1fr;
  }
  .compare-divider { text-align: center; }
}

/* ── Providers bar ───────────────────────────────────────────────────────── */

.providers-bar .section-inner {
  padding: 64px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.providers-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 20px 0 16px;
}

.provider-chip {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  border-radius: var(--r-pill);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.1px;
}

.providers-arrow {
  font-size: 20px;
  color: var(--ink-muted);
}

.providers-note {
  font-size: 14px;
  color: var(--ink-muted);
  letter-spacing: -0.1px;
}

/* ── Feature tiles ───────────────────────────────────────────────────────── */

.feature-tile { padding: 0; }

.feature-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 96px 48px;
}

.feature-inner--left {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 64px;
}

.feature-inner--center {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.feature-inner--dark .feature-text { order: 1; }
.feature-inner--dark .feature-visual { order: 2; }

.feature-list {
  margin-top: 24px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-list li {
  font-size: 15px;
  color: var(--ink-muted);
  letter-spacing: -0.1px;
  padding-left: 20px;
  position: relative;
}

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--blue);
  font-weight: 600;
}

.feature-list--light li { color: var(--body-muted); }
.feature-list--light li::before { color: var(--blue-dark); }

/* Mock card */

.mock-card {
  background: var(--canvas);
  border-radius: var(--r-card);
  padding: 24px;
  border: 1px solid var(--hairline);
}

.mock-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 16px;
}

.mock-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--parchment);
}

.mock-row:last-child { border-bottom: none; }

.mock-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--blue);
  flex-shrink: 0;
  width: 64px;
}

.mock-val {
  font-size: 14px;
  color: var(--ink);
  letter-spacing: -0.1px;
  line-height: 1.45;
}

/* Privacy badge */

.feature-visual--dark {
  display: flex;
  align-items: center;
  justify-content: center;
}

.privacy-badge {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--r-card);
  padding: 40px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
}

.privacy-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(0, 102, 204, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
}

.privacy-label {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.2px;
}

.privacy-sub {
  font-size: 13px;
  color: var(--body-muted);
}

/* ── Modes grid ──────────────────────────────────────────────────────────── */

.modes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  width: 100%;
}

.mode-card {
  background: var(--canvas);
  border-radius: var(--r-mode);
  padding: 28px 24px;
  border: 1px solid var(--hairline);
  text-align: left;
}

.mode-icon {
  font-size: 22px;
  margin-bottom: 14px;
  color: var(--blue);
}

.mode-card h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.25px;
  color: var(--ink);
  margin-bottom: 8px;
}

.mode-card p {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-muted);
  letter-spacing: -0.1px;
}

/* ── How it works ────────────────────────────────────────────────────────── */

.how .section-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.steps-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-top: 56px;
  width: 100%;
}

.step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--parchment);
  border: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--blue);
  margin-bottom: 20px;
  flex-shrink: 0;
}

.step h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.25px;
  margin-bottom: 10px;
}

.step p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-muted);
  letter-spacing: -0.1px;
  max-width: 220px;
}

.step-connector {
  font-size: 22px;
  color: var(--hairline);
  margin-top: 8px;
  flex-shrink: 0;
}

/* ── CTA section ─────────────────────────────────────────────────────────── */

.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 20px;
}

.cta-inner .hero-lead { margin-bottom: 12px; }

.cta-footnote {
  font-size: 13px;
  color: #6e6e73;
  letter-spacing: -0.1px;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */

.footer { padding: 0; }

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 48px 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--ink-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
  padding: 12px 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.footer-links a {
  font-size: 13px;
  color: var(--ink-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover { color: var(--ink); }

.footer-copy {
  font-size: 12px;
  color: #a1a1a6;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 834px) {
  .nav-links { display: none; }
  .nav-cta { margin-left: auto; }

  /* Hero stacks: text on top, mockup below */
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
    padding: 72px 32px 80px;
    gap: 56px;
  }
  .hero-text { align-items: center; }
  .hero-actions { justify-content: center; }

  .feature-inner--left {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 72px 32px;
  }

  .feature-inner--dark .feature-text { order: 1; }
  .feature-inner--dark .feature-visual { order: 2; }

  .modes-grid {
    grid-template-columns: 1fr;
  }

  .steps-row {
    flex-direction: column;
    align-items: center;
  }

  .step-connector {
    transform: rotate(90deg);
    margin: 0;
  }

  .hero-display { font-size: 38px; }
  .hero-lead { font-size: 17px; }
}

@media (max-width: 640px) {
  .section-inner { padding: 72px 24px; }
  .feature-inner { padding: 72px 24px; }
  .hero-inner { padding: 64px 24px 56px; }

  .hero-display { font-size: 32px; }
  .display-md { font-size: 26px; }

  .hero-actions { flex-direction: column; gap: 16px; }
  .hero-mockup { display: none; } /* too small on phones */

  .footer-inner { padding: 40px 24px 32px; }
}