/* ============================================
   LAGANCES — Mercury Design System
   Alpine banking at blue hour
   ============================================ */

:root {
  /* Colors */
  --color-onyx-canvas: #171721;
  --color-graphite-card: #1e1e2a;
  --color-obsidian-button: #272735;
  --color-slate-border: #70707d;
  --color-mist-border: #e2e3ed;
  --color-ash-text: #c3c3cc;
  --color-ivory-text: #ededf3;
  --color-cobalt: #5266eb;
  --color-pure-white: #ffffff;

  /* Typography — Font Families (Inter as arcadia substitute) */
  --font-arcadia: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-arcadiadisplay: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Typography — Scale */
  --text-caption: 12px;
  --leading-caption: 1;
  --tracking-caption: 0.12px;
  --text-body-sm: 14px;
  --leading-body-sm: 1;
  --tracking-body-sm: 0.07px;
  --text-body: 16px;
  --leading-body: 1.5;
  --text-body-lg: 18px;
  --leading-body-lg: 1.35;
  --text-subheading: 21px;
  --leading-subheading: 1.35;
  --text-heading-sm: 28px;
  --leading-heading-sm: 1.2;
  --tracking-heading-sm: 0.42px;
  --text-heading: 32px;
  --leading-heading: 1.15;
  --tracking-heading: 0.48px;
  --text-heading-lg: 42px;
  --leading-heading-lg: 1.15;
  --tracking-heading-lg: 0.42px;
  --text-display: 65px;
  --leading-display: 1.1;

  /* Weights */
  --font-weight-w360: 360;
  --font-weight-regular: 400;
  --font-weight-w420: 420;
  --font-weight-w480: 480;
  --font-weight-w530: 530;

  /* Spacing */
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --spacing-40: 40px;
  --spacing-56: 56px;
  --spacing-72: 72px;
  --spacing-112: 112px;
  --spacing-128: 128px;

  /* Layout */
  --page-max-width: 1200px;
  --section-gap: 72px;
  --card-padding: 32px;
  --element-gap: 12px;

  /* Border Radius */
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-3xl: 32px;
  --radius-3xl-2: 40px;
  --radius-nav: 40px;
  --radius-tags: 40px;
  --radius-cards: 12px;
  --radius-inputs: 32px;
  --radius-buttons: 32px;
  --radius-default: 4px;
}

/* ========== RESET & BASE ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-arcadia);
  font-weight: 400;
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-ivory-text);
  background-color: var(--color-onyx-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-24);
}

/* ========== TYPOGRAPHY ========== */
.section-label {
  font-family: var(--font-arcadia);
  font-size: var(--text-caption);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ash-text);
  margin-bottom: var(--spacing-16);
}

.section-label.light { color: var(--color-slate-border); }

.heading {
  font-family: var(--font-arcadiadisplay);
  font-size: var(--text-heading);
  font-weight: 500;
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ivory-text);
}

.heading-sm {
  font-family: var(--font-arcadiadisplay);
  font-size: var(--text-heading-sm);
  font-weight: 500;
  line-height: var(--leading-heading-sm);
  letter-spacing: var(--tracking-heading-sm);
  color: var(--color-ivory-text);
}

.heading-lg {
  font-family: var(--font-arcadiadisplay);
  font-size: clamp(28px, 4vw, var(--text-heading-lg));
  font-weight: 500;
  line-height: var(--leading-heading-lg);
  letter-spacing: var(--tracking-heading-lg);
  color: var(--color-ivory-text);
}

.display {
  font-family: var(--font-arcadiadisplay);
  font-size: clamp(36px, 6vw, var(--text-display));
  font-weight: 500;
  line-height: var(--leading-display);
  color: var(--color-ivory-text);
}

.body-muted {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-ash-text);
  max-width: 480px;
}

.body-lg {
  font-size: var(--text-body-lg);
  line-height: var(--leading-body-lg);
  color: var(--color-ash-text);
}

/* ========== BUTTONS ========== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--color-cobalt);
  color: var(--color-pure-white);
  font-family: var(--font-arcadia);
  font-size: var(--text-body);
  font-weight: 400;
  border: none;
  border-radius: var(--radius-buttons);
  padding: 14px 28px;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.15s ease;
  white-space: nowrap;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-primary.btn-lg {
  padding: 18px 32px;
  font-size: 15px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--color-ivory-text);
  font-family: var(--font-arcadia);
  font-size: var(--text-body);
  font-weight: 400;
  border: 1px solid var(--color-mist-border);
  border-radius: var(--radius-3xl-2);
  padding: 12px 24px;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.btn-ghost:hover {
  background: var(--color-obsidian-button);
  border-color: var(--color-ivory-text);
}

/* ========== NAV ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

.nav.scrolled {
  background: rgba(23, 23, 33, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--color-cobalt);
  color: var(--color-pure-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 18px;
}

.logo-text {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-ivory-text);
}

.logo-text small {
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-ash-text);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--color-ivory-text);
  padding: 8px 14px;
  border-radius: var(--radius-nav);
  transition: background 0.2s ease;
}

.nav-links a:hover {
  background: var(--color-obsidian-button);
}

.nav-cta {
  flex-shrink: 0;
  font-size: 13px !important;
  padding: 10px 20px !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-ivory-text);
  transition: transform 0.25s ease;
}

/* ========== HERO ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background:
    linear-gradient(105deg, rgba(23,23,33,0.92) 0%, rgba(23,23,33,0.55) 45%, rgba(23,23,33,0.3) 100%),
    url('https://images.unsplash.com/photo-1517245386807-bb43f82c33c4?w=1600&q=80') center/cover no-repeat;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, transparent 0%, rgba(23,23,33,0.4) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
  padding: 0 24px;
  margin-left: max(24px, calc((100vw - var(--page-max-width)) / 2));
}

.hero-tag {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--color-ash-text);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-arcadiadisplay);
  font-size: clamp(36px, 5.5vw, 58px);
  font-weight: 500;
  line-height: 1.12;
  color: var(--color-ivory-text);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 17px;
  line-height: 1.5;
  color: var(--color-ash-text);
  max-width: 480px;
  margin-bottom: 36px;
}

.hero-side {
  position: absolute;
  right: 48px;
  bottom: 80px;
  z-index: 2;
  text-align: right;
  max-width: 180px;
}

.hero-side-label {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1.5;
  color: var(--color-ivory-text);
  margin-bottom: 16px;
}

.hero-side-link {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-ash-text);
  transition: color 0.2s;
}

.hero-side-link:hover { color: var(--color-ivory-text); }

/* ========== SECTIONS ========== */
.section {
  padding: var(--section-gap) 0;
}

/* ========== PROBLEM ========== */
.problem {
  background: var(--color-onyx-canvas);
}

.problem-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}

.problem-list {
  margin: 32px 0;
}

.problem-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 16px;
  color: var(--color-ash-text);
  margin-bottom: 12px;
  line-height: 1.4;
}

.problem-list .x {
  color: #e05a5a;
  font-weight: 500;
  flex-shrink: 0;
}

.problem-note {
  font-size: 15px;
  color: var(--color-ivory-text);
  line-height: 1.5;
  margin-top: 8px;
}

.problem-visual {
  display: flex;
  justify-content: center;
}

.chess-card {
  background: var(--color-graphite-card);
  border-radius: var(--radius-cards);
  overflow: hidden;
  width: 100%;
  max-width: 420px;
  aspect-ratio: 4/5;
}

.chess-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ========== METHOD ========== */
.method {
  background: var(--color-onyx-canvas);
}

.method-header {
  max-width: 520px;
  margin-bottom: 56px;
}

.method-header .body-muted {
  margin: 20px 0 28px;
}

.method-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.step-card {
  background: var(--color-graphite-card);
  border-radius: var(--radius-cards);
  padding: var(--card-padding);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background 0.2s ease;
}

.step-card:hover {
  background: var(--color-obsidian-button);
}

.step-icon {
  color: var(--color-ivory-text);
  margin-bottom: 8px;
}

.step-num {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-cobalt);
}

.step-card h3 {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-ivory-text);
}

.step-card p {
  font-size: 14px;
  line-height: 1.45;
  color: var(--color-ash-text);
}

/* ========== ECOSYSTEM ========== */
.ecosystem {
  background: var(--color-onyx-canvas);
}

.eco-header {
  max-width: 520px;
  margin-bottom: 56px;
}

.eco-header .body-muted {
  margin: 20px 0 28px;
}

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

.eco-card {
  background: var(--color-graphite-card);
  border-radius: var(--radius-cards);
  padding: var(--card-padding);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background 0.2s ease;
  min-height: 180px;
}

.eco-card:hover {
  background: var(--color-obsidian-button);
}

.eco-icon {
  color: var(--color-ivory-text);
  margin-bottom: 4px;
}

.eco-card h3 {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-ivory-text);
}

.eco-card p {
  font-size: 14px;
  line-height: 1.45;
  color: var(--color-ash-text);
}

/* ========== EFFECT / TESTIMONIAL ========== */
.effect {
  background: var(--color-onyx-canvas);
  padding-bottom: 96px;
}

.effect-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: end;
}

.effect-visual {
  position: relative;
  border-radius: var(--radius-cards);
  overflow: hidden;
  aspect-ratio: 16/10;
}

.effect-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.effect-label {
  position: absolute;
  left: 32px;
  bottom: 32px;
  max-width: 320px;
}

.effect-label .section-label {
  color: rgba(237, 237, 243, 0.7);
}

.effect-label .heading-sm {
  color: var(--color-pure-white);
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.testimonial-card {
  background: var(--color-graphite-card);
  border-radius: var(--radius-cards);
  padding: 40px 36px;
}

.testimonial-card blockquote {
  font-size: 18px;
  line-height: 1.5;
  color: var(--color-ivory-text);
  margin-bottom: 24px;
  font-weight: 400;
}

.testimonial-card cite {
  font-size: 14px;
  color: var(--color-ash-text);
  font-style: normal;
}

/* ========== DIAGNOSTIC ========== */
.diagnostic {
  background: var(--color-onyx-canvas);
}

.diag-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: center;
  background: var(--color-graphite-card);
  border-radius: var(--radius-cards);
  padding: 48px;
  overflow: hidden;
}

.diag-visual {
  display: flex;
  justify-content: center;
}

.diag-card-visual {
  width: 280px;
  height: 180px;
  background: linear-gradient(145deg, #1a1a28 0%, #0e0e16 100%);
  border-radius: 16px;
  border: 1px solid rgba(226, 227, 237, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 20px 40px rgba(0,0,0,0.35);
  position: relative;
}

.diag-card-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(82,102,235,0.15), transparent 60%);
}

.diag-logo {
  text-align: center;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-ivory-text);
  z-index: 1;
}

.diag-logo small {
  display: block;
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--color-ash-text);
  margin-top: 4px;
}

.diag-content .body-muted {
  margin: 16px 0 20px;
}

.diag-list {
  margin-bottom: 32px;
}

.diag-list li {
  font-size: 15px;
  color: var(--color-ash-text);
  margin-bottom: 10px;
  line-height: 1.4;
}

.diag-price {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 28px;
}

.price-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--color-ash-text);
}

.price-value {
  font-family: var(--font-arcadiadisplay);
  font-size: 36px;
  font-weight: 500;
  color: var(--color-ivory-text);
}

/* ========== NEXT STEPS ========== */
.next-steps {
  background: #f5f4f0;
  color: #1a1a1a;
  padding: 80px 0;
}

.next-steps .section-label {
  color: #6b6b6b;
}

.next-steps .heading {
  color: #1a1a1a;
  margin-bottom: 48px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.next-card {
  background: #fff;
  border-radius: 12px;
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid #e8e7e3;
  transition: box-shadow 0.2s ease;
}

.next-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.next-icon {
  color: #1a1a1a;
  margin-bottom: 4px;
}

.next-card h3 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #1a1a1a;
}

.next-card p {
  font-size: 13px;
  line-height: 1.45;
  color: #6b6b6b;
}

/* ========== FINAL CTA ========== */
.final-cta {
  background:
    linear-gradient(180deg, rgba(23,23,33,0.7) 0%, rgba(23,23,33,0.95) 100%),
    url('https://images.unsplash.com/photo-1507679799987-c73779587ccf?w=1600&q=80') center/cover no-repeat;
  padding: 120px 0;
  text-align: center;
}

.final-content {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.logo-large {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
}

.logo-large .logo-mark {
  width: 44px;
  height: 44px;
  font-size: 20px;
}

.logo-large span {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.25;
  text-align: left;
}

.logo-large small {
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-ash-text);
}

.final-content .display {
  margin-top: 8px;
}

.final-content .body-lg {
  margin-bottom: 12px;
}

/* ========== FOOTER ========== */
.footer {
  background: var(--color-onyx-canvas);
  border-top: 1px solid rgba(112, 112, 125, 0.25);
  padding: 48px 0 32px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-ash-text);
  padding: 6px 12px;
  border-radius: 20px;
  transition: color 0.2s;
}

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

.social {
  display: flex;
  gap: 12px;
}

.social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-slate-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--color-ash-text);
  transition: border-color 0.2s, color 0.2s;
}

.social a:hover {
  border-color: var(--color-ivory-text);
  color: var(--color-ivory-text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid rgba(112, 112, 125, 0.2);
}

.footer-bottom p {
  font-size: 12px;
  color: var(--color-slate-border);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .method-steps { grid-template-columns: repeat(2, 1fr); }
  .eco-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(3, 1fr); }
  .problem-grid,
  .effect-grid,
  .diag-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-side { display: none; }
  .diag-grid { padding: 32px; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(23, 23, 33, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 4px;
  }

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

  .nav-toggle { display: flex; }

  .nav-cta { display: none; }

  .method-steps,
  .eco-grid,
  .steps-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 90vh;
    padding: 100px 0 60px;
  }

  .hero-title {
    font-size: clamp(32px, 8vw, 42px);
  }

  .section { padding: 56px 0; }

  .diag-grid { padding: 28px 20px; }

  .final-cta { padding: 80px 0; }

  .footer-top { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .btn-primary.btn-lg {
    width: 100%;
    text-align: center;
    white-space: normal;
    padding: 16px 20px;
  }
}