/* ============================================
   REVNA — Design System
   Reporting Software for Electrical T&C
   ============================================ */

/* --- Custom Properties --- */
:root {
  /* Colors */
  --primary: #3a3e34;
  --primary-light: #4f5448;
  --warm-white: #f8f8f6;
  --off-white: #eae8e3;
  --accent: #c6923a;
  --accent-hover: #a87a2e;

  /* Typography */
  --font-body: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Layout */
  --max-width: 1120px;
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--primary);
  background-color: var(--warm-white);
  -webkit-font-smoothing: antialiased;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--primary);
}

h1 {
  font-size: 2.25rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.75rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.25rem;
}

p {
  max-width: 640px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.subhead {
  font-size: 1.125rem;
  font-weight: 300;
  color: var(--primary-light);
  line-height: 1.5;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--space-xl) 0;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.75rem 1.75rem;
  border-radius: 4px;
  transition: all 0.2s ease;
  text-align: center;
}

.btn-filled {
  background-color: var(--primary);
  color: var(--warm-white);
  border: 2px solid var(--primary);
}

.btn-filled:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-light);
}

.btn-outlined {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outlined:hover {
  background-color: var(--primary);
  color: var(--warm-white);
}

.btn-outlined-light {
  background: transparent;
  color: var(--warm-white);
  border: 2px solid var(--warm-white);
}

.btn-outlined-light:hover {
  background-color: var(--warm-white);
  color: var(--primary);
}

.hero-ctas {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.download-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
}

.btn-download-soon {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #9e9b93;
  border: 1px solid #9e9b93;
  background: transparent;
  cursor: not-allowed;
  font-family: inherit;
}

.btn-download-soon:hover {
  background: transparent;
  color: #9e9b93;
  border-color: #9e9b93;
}

.coming-soon-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9e9b93;
  margin: 0;
  line-height: 1;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: var(--warm-white);
  border-bottom: 1px solid var(--off-white);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  line-height: 1;
}

.nav-mark-text {
  font-family: var(--font-body);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.nav-mark-logo {
  width: auto;
  height: 20px;
  transition: transform 0.2s ease;
}

.nav-mark:hover .nav-mark-logo,
.nav-mark:focus-visible .nav-mark-logo {
  transform: translateY(-8px) rotate(-8deg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--primary-light);
  transition: color 0.2s ease;
}

.nav-links a:not(.btn):hover {
  color: var(--primary);
}

.nav-links .btn {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
  transition: all 0.2s ease;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Booking Confirmation --- */
.booking-confirmation {
  padding-top: calc(var(--nav-height) + var(--space-sm));
  padding-bottom: 0;
}

.booking-confirmation__message {
  max-width: 100%;
  border-radius: 4px;
  padding: 0.8rem 1rem;
  border: 1px solid #b7d3b1;
  background: #edf7ea;
  color: #2c4a29;
  font-size: 0.9375rem;
  font-weight: 500;
}

/* --- Hero --- */
.hero {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  position: relative;
  overflow: hidden;
}

/* Grid-dot background texture */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--off-white) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.hero .container {
  position: relative;
}

.hero-content {
  max-width: 60%;
  position: relative;
  z-index: 1;
}

.hero .eyebrow {
  margin-bottom: var(--space-sm);
}

.hero h1 {
  margin-bottom: var(--space-md);
}

.hero .subhead {
  margin-bottom: var(--space-lg);
}

/* Hero illustration */
.hero-illustration {
  position: absolute;
  right: 0;
  top: 0;
  bottom: calc(-1 * var(--space-2xl));
  width: 52%;
  opacity: 0.35;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to right, transparent, black 8%);
  mask-image: linear-gradient(to right, transparent, black 8%);
}

.hero-illustration img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
}

/* Hero fade-in */
.hero-content {
  animation: heroFadeIn 0.6s ease-out;
}

@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Problem Section --- */
.problem {
  background-color: var(--off-white);
}

.problem h2 {
  margin-bottom: var(--space-xs);
}

.problem h2 + .problem-grid {
  margin-top: var(--space-lg);
}

.problem .section-subhead {
  color: var(--primary-light);
  margin-bottom: var(--space-lg);
  font-weight: 300;
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.problem-card {
  background: var(--warm-white);
  border: 1px solid #ddd9d2;
  border-radius: 4px;
  padding: var(--space-md);
}

.problem-card .card-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: var(--space-xs);
}

.problem-card h3 {
  margin-bottom: var(--space-xs);
}

.problem-card p {
  font-size: 0.9375rem;
  color: var(--primary-light);
  line-height: 1.5;
}

.problem-close {
  margin-top: var(--space-lg);
  padding-left: var(--space-md);
  border-left: 3px solid var(--accent);
}

.problem-close-lead {
  font-size: 1rem;
  font-weight: 300;
  color: var(--primary-light);
  letter-spacing: 0.01em;
  margin-bottom: 0.25rem;
}

.problem-close-punch {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: -0.01em;
}

/* --- How It Works --- */
.how-it-works h2 {
  margin-bottom: var(--space-xs);
}

.how-it-works > .container > .subhead {
  margin-bottom: var(--space-lg);
}

/* Inputs → Platform Flow */
.inputs-flow {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}
.inputs-flow__sources {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}
.inputs-flow__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.inputs-flow__item svg {
  stroke: var(--accent);
  width: 40px;
  height: 40px;
}
.inputs-flow__item span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--primary-light);
}
.inputs-flow__sources::after,
.inputs-flow__step::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  margin: var(--space-sm) auto;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--accent);
  opacity: 0.5;
}
.inputs-flow__sources::after {
  grid-column: 1 / -1;
}
.inputs-flow__step--last {
  position: relative;
}
.inputs-flow__step--last::before {
  content: '✦';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -53%);
  font-size: 12rem;
  color: var(--accent);
  opacity: 0.07;
  z-index: 0;
  pointer-events: none;
}
.inputs-flow__step--last svg {
  position: relative;
  z-index: 1;
}
.inputs-flow__step--last::after {
  display: none;
}
.inputs-flow__step--last span {
  font-weight: 600;
}
.inputs-flow__step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}
.inputs-flow__step svg {
  stroke: var(--primary-light);
  width: 40px;
  height: 40px;
}
.inputs-flow__outputs .inputs-flow__step svg {
  width: 56px;
  height: 56px;
}
.inputs-flow__outputs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
  align-items: end;
}
.inputs-flow__outputs .inputs-flow__step::after {
  display: none;
}
.inputs-flow__arrow-right {
  width: 0;
  height: 0;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 10px solid var(--accent);
  opacity: 0.5;
  flex-shrink: 0;
  margin-bottom: 1.2rem;
}
.inputs-flow__step span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--primary-light);
}
.inputs-flow__logo {
  width: 56px;
  height: 56px;
}
.inputs-flow__logo + span {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}
/* Dark card overrides */
.compare-before .inputs-flow__item span {
  color: #b0b5a8;
}
.compare-before .inputs-flow__step span {
  color: #b0b5a8;
}
.compare-before .inputs-flow__logo + span {
  color: var(--accent);
}

@media (min-width: 768px) {
  .inputs-flow {
    max-width: 100%;
  }
  .inputs-flow__sources {
    grid-template-columns: repeat(2, 1fr);
  }
  .inputs-flow__logo {
    width: 64px;
    height: 64px;
  }
}

/* Before / After Compare */
.compare {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.compare-col {
  border-radius: 4px;
  padding: var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.compare-before {
  background-color: var(--primary);
  color: var(--warm-white);
}

.compare-before .compare-heading {
  color: var(--warm-white);
  opacity: 0.85;
}

.compare-before h4 {
  color: var(--warm-white);
}

.compare-before p {
  color: #b0b5a8;
}

.compare-before .compare-num {
  color: #6b7060;
}

.compare-after {
  background-color: var(--warm-white);
  border: 1px solid var(--off-white);
  border-top: 3px solid var(--accent);
}

.compare-after .compare-num {
  color: var(--accent);
}

.compare-heading {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.compare-step {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.compare-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.6;
  flex-shrink: 0;
  padding-top: 0.15em;
}

.compare-step h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.125rem;
}

.compare-step p {
  font-size: 0.9375rem;
  line-height: 1.5;
}

/* --- Final CTA --- */
.final-cta {
  background-color: var(--primary);
  text-align: center;
}

.final-cta h2 {
  color: var(--warm-white);
  margin-bottom: var(--space-sm);
}

.final-cta .subhead {
  color: #b0b5a8;
  margin-bottom: var(--space-lg);
  margin-left: auto;
  margin-right: auto;
}

/* --- Footer --- */
.footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--off-white);
}

.footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
}

.footer-left {
  font-size: 0.875rem;
  color: var(--primary-light);
}

.footer-links {
  display: flex;
  gap: var(--space-md);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--primary-light);
  transition: color 0.2s ease;
}

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

/* --- FAQ Page --- */
.faq-hero {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-lg);
  position: relative;
  overflow: hidden;
}

.faq-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--off-white) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.faq-hero .container {
  position: relative;
}

.faq-hero .hero-content {
  max-width: 640px;
}

/* FAQ Sections */
.faq-section {
  padding: var(--space-lg) 0;
}

.faq-section.alt-bg {
  background-color: var(--off-white);
}

.faq-section.alt-bg .faq-item {
  background-color: var(--warm-white);
}

/* FAQ Group */
.faq-group-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: var(--space-md);
  padding-left: 2px;
}

/* FAQ Items — Accordion */
.faq-item {
  border: 1px solid #ddd9d2;
  border-radius: 4px;
  margin-bottom: var(--space-xs);
  background-color: var(--warm-white);
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: var(--accent);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-md);
  cursor: pointer;
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--primary);
  line-height: 1.4;
  list-style: none;
  user-select: none;
}

/* Hide default marker in all browsers */
.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::marker {
  content: '';
}

.faq-question:hover {
  color: var(--primary);
}

.faq-question span {
  flex: 1;
}

/* Chevron rotation */
.faq-chevron {
  flex-shrink: 0;
  transition: transform 0.25s ease;
  color: var(--primary-light);
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent);
}

/* Answer area */
.faq-answer {
  padding: 0 var(--space-md) var(--space-md);
  animation: faqSlideDown 0.25s ease;
}

.faq-answer p {
  font-size: 0.9375rem;
  color: var(--primary-light);
  line-height: 1.65;
  max-width: 680px;
}

/* --- How It Works Page --- */
.how-hero {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.how-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--off-white) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.how-hero .container {
  position: relative;
}

.how-hero .hero-content {
  max-width: 640px;
}

.how-section {
  padding: var(--space-xl) 0;
}

.how-section.alt-bg {
  background-color: var(--off-white);
}

.how-section h2 {
  margin-bottom: var(--space-md);
}

.how-section p {
  margin-bottom: var(--space-sm);
  color: var(--primary-light);
  font-size: 1.0625rem;
  line-height: 1.6;
}

.how-section p:last-child {
  margin-bottom: 0;
}

.how-section .highlight {
  color: var(--primary);
  font-weight: 500;
}

@keyframes faqSlideDown {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive: Tablet (768px+) --- */
@media (min-width: 768px) {
  h1 {
    font-size: 2.75rem;
  }

  h2 {
    font-size: 2rem;
  }

  section {
    padding: var(--space-2xl) 0;
  }

  .problem-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .compare {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-illustration {
    width: 48%;
    opacity: 0.25;
  }
}

/* --- Responsive: Desktop (1024px+) --- */
@media (min-width: 1024px) {
  h1 {
    font-size: 3.25rem;
  }

  .hero {
    padding-top: calc(var(--nav-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
    min-height: 70vh;
    display: flex;
    align-items: center;
  }

  .hero .container {
    align-self: stretch;
    display: flex;
    align-items: center;
  }

  .hero-illustration {
    width: 52%;
  }

  .faq-hero {
    padding-top: calc(var(--nav-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
  }

  .how-hero {
    padding-top: calc(var(--nav-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
  }
}

/* --- Responsive: Mobile (<768px) --- */
@media (max-width: 767px) {
  .nav-mark-text {
    font-size: 1.25rem;
  }

  .nav-mark-logo {
    height: 18px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--warm-white);
    border-bottom: 1px solid var(--off-white);
    padding: var(--space-md);
    gap: var(--space-sm);
  }

  .nav-links.open {
    display: flex;
  }

  .hamburger {
    display: flex;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-illustration {
    width: 70%;
    top: auto;
    bottom: calc(-1 * var(--space-xl));
    height: 55%;
    opacity: 0.3;
    -webkit-mask-image: linear-gradient(to right, transparent, black 8%),
                        linear-gradient(to bottom, transparent, black 25%);
    mask-image: linear-gradient(to right, transparent, black 8%),
                linear-gradient(to bottom, transparent, black 25%);
    -webkit-mask-composite: source-in;
    mask-composite: intersect;
  }
}

/* --- Responsive: Large Mobile Edge (640px-767px) --- */
@media (min-width: 640px) and (max-width: 767px) {
  .hero-illustration {
    width: 64%;
    top: 0;
    bottom: calc(-1 * var(--space-xl));
    height: auto;
    opacity: 0.26;
    -webkit-mask-image: linear-gradient(to right, transparent, black 8%);
    mask-image: linear-gradient(to right, transparent, black 8%);
  }

  .hero-illustration img {
    object-position: center 46%;
  }
}