/* ═══════════════════════════════════════
   LivePOB — Design Tokens
   Oil & Gas Enterprise Dark Theme
   ═══════════════════════════════════════ */

:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing (4px base) */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Font families */
  --font-display: 'General Sans', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
}

/* ═══════════════════════════════════════
   Dark Theme (Default) — Industrial
   Charcoal base, amber accent, cool blue secondary
   ═══════════════════════════════════════ */
:root, [data-theme="dark"] {
  --color-bg:             #0C0F14;
  --color-surface:        #131720;
  --color-surface-2:      #1A1F2B;
  --color-surface-offset: #161B26;
  --color-border:         #2A3040;
  --color-divider:        #222838;

  --color-text:           #E2E4E9;
  --color-text-muted:     #8B90A0;
  --color-text-faint:     #5C6178;
  --color-text-inverse:   #0C0F14;

  --color-primary:        #D4A23A;
  --color-primary-hover:  #E5B64E;
  --color-primary-active: #C4922A;

  --color-secondary:      #3B82C4;
  --color-secondary-hover:#5196D4;

  --color-success:        #3DAA6D;
  --color-error:          #DC4E4E;
  --color-warning:        #E5963A;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

/* ═══════════════════════════════════════
   Light Theme
   ═══════════════════════════════════════ */
[data-theme="light"] {
  --color-bg:             #F4F5F7;
  --color-surface:        #FFFFFF;
  --color-surface-2:      #F9FAFB;
  --color-surface-offset: #EDEEF1;
  --color-border:         #D1D5DB;
  --color-divider:        #E5E7EB;

  --color-text:           #111827;
  --color-text-muted:     #6B7280;
  --color-text-faint:     #9CA3AF;
  --color-text-inverse:   #FFFFFF;

  --color-primary:        #B8891E;
  --color-primary-hover:  #A07816;
  --color-primary-active: #8D6A12;

  --color-secondary:      #2563EB;
  --color-secondary-hover:#1D4ED8;

  --color-success:        #16A34A;
  --color-error:          #DC2626;
  --color-warning:        #D97706;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg:             #F4F5F7;
    --color-surface:        #FFFFFF;
    --color-surface-2:      #F9FAFB;
    --color-surface-offset: #EDEEF1;
    --color-border:         #D1D5DB;
    --color-divider:        #E5E7EB;
    --color-text:           #111827;
    --color-text-muted:     #6B7280;
    --color-text-faint:     #9CA3AF;
    --color-text-inverse:   #FFFFFF;
    --color-primary:        #B8891E;
    --color-primary-hover:  #A07816;
    --color-primary-active: #8D6A12;
    --color-secondary:      #2563EB;
    --color-secondary-hover:#1D4ED8;
    --color-success:        #16A34A;
    --color-error:          #DC2626;
    --color-warning:        #D97706;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
  }
}

/* ═══════════════════════════════════════
   Components
   ═══════════════════════════════════════ */

/* — Nav — */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-6);
}
.nav__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}
.nav__logo-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}
.nav__logo-text span {
  color: var(--color-primary);
}
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}
.nav__links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
}
.nav__links a:hover {
  color: var(--color-text);
}
.nav__cta {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
  white-space: nowrap;
}
.nav__cta:hover {
  background: var(--color-primary-hover);
}
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* Mobile nav */
.nav__hamburger {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-6);
    gap: var(--space-4);
  }
}

/* — Hero — */
.hero {
  padding: clamp(var(--space-16), 12vw, var(--space-32)) var(--space-6);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 120%;
  height: 100%;
  background: radial-gradient(ellipse at center, oklch(from var(--color-primary) l c h / 0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero__inner {
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-1) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-8);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: 1.05;
}
.hero__title em {
  font-style: normal;
  color: var(--color-primary);
}
.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-10);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}
.hero__pillars {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
  flex-wrap: wrap;
}
.hero__pillar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}
.hero__pillar-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}
.hero__pillar-label {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.hero__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* — Buttons — */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  text-decoration: none;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
}
.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--outline:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface-2);
}
.btn--large {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-lg);
}

/* — Section — */
.section {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
}
.section--alt {
  background: var(--color-surface);
}
.section__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}
.section__header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}
.section__eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}
.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.6;
}

/* — Comparison Table — */
.comparison-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.comparison {
  min-width: 1100px;
  font-size: var(--text-sm);
}
.comparison thead {
  position: sticky;
  top: 0;
  z-index: 2;
}
.comparison th,
.comparison td {
  padding: var(--space-3) var(--space-4);
  text-align: center;
  vertical-align: middle;
  border-bottom: 1px solid var(--color-border);
}
.comparison th {
  background: var(--color-surface-2);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  white-space: nowrap;
}
.comparison th:first-child,
.comparison td:first-child {
  text-align: left;
  font-weight: 600;
  position: sticky;
  left: 0;
  background: var(--color-surface);
  z-index: 1;
  min-width: 180px;
  border-right: 1px solid var(--color-border);
}
.comparison thead th:first-child {
  background: var(--color-surface-2);
}
.comparison th.col-highlight {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  letter-spacing: 0;
  text-transform: none;
}
.comparison td.col-highlight {
  background: oklch(from var(--color-primary) l c h / 0.06);
}
.comparison tbody tr:last-child td {
  border-bottom: none;
}
.comparison tbody tr:hover td {
  background: var(--color-surface-2);
}
.comparison tbody tr:hover td.col-highlight {
  background: oklch(from var(--color-primary) l c h / 0.1);
}
.comparison .check {
  color: var(--color-success);
  font-weight: 700;
  font-size: 1.1em;
}
.comparison .cross {
  color: var(--color-error);
  font-weight: 700;
}
.comparison .partial {
  color: var(--color-warning);
  font-size: var(--text-xs);
}
.comparison .cell-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  display: block;
  margin-top: 2px;
}

/* — Pain Points — */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}
.pain-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}
.pain-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: oklch(from var(--color-error) l c h / 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-error);
  margin-bottom: var(--space-5);
}
.pain-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.pain-card__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* — Differentiators — */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}
.diff-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
}
.diff-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
}
.diff-card__number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  font-variant-numeric: tabular-nums;
}
.diff-card__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.diff-card__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* — Social Proof Bar — */
.proof-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: clamp(var(--space-8), 4vw, var(--space-16));
  flex-wrap: wrap;
  padding: var(--space-4) 0;
}
.proof-stat {
  text-align: center;
}
.proof-stat__number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}
.proof-stat__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* — CTA Section — */
.cta-section {
  padding: clamp(var(--space-16), 10vw, var(--space-32)) var(--space-6);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  bottom: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 140%;
  height: 100%;
  background: radial-gradient(ellipse at center, oklch(from var(--color-primary) l c h / 0.06) 0%, transparent 60%);
  pointer-events: none;
}
.cta-section__inner {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.cta-section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.cta-section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

/* — Footer — */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-6);
}
.footer__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer__links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}
.footer__links a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}
.footer__links a:hover {
  color: var(--color-text-muted);
}

/* — Scroll Animations — */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* — Responsive — */
@media (max-width: 768px) {
  .hero__pillars { gap: var(--space-6); }
  .pain-grid { grid-template-columns: 1fr; }
  .diff-grid { grid-template-columns: 1fr; }
  .footer__inner { flex-direction: column; text-align: center; }
  .footer__links { justify-content: center; }
  .proof-bar { gap: var(--space-6); }
}

/* — Scroll hint for mobile table — */
.table-hint {
  display: none;
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
@media (max-width: 1100px) {
  .table-hint { display: block; }
}