/* ============================================
   COLUMMA — Premium International Finance
   Design System & Styles
   ============================================ */

/* --- Custom Properties --- */
:root {
  /* Colors */
  --c-bg-primary: #0B0B0B;
  --c-bg-secondary: #101010;
  --c-bg-tertiary: #161614;
  --c-bg-light: #F0ECE5;
  --c-bg-light-alt: #E6E1D8;

  --c-text-primary: #F0ECE5;
  --c-text-secondary: #8E8E86;
  --c-text-muted: #5A5A55;
  --c-text-dark: #1A1A18;
  --c-text-dark-secondary: #6A6A62;

  --c-accent: #3A6B5A;
  --c-accent-light: #4A8B6E;
  --c-accent-gold: #C4A265;
  --c-accent-gold-dim: rgba(196, 162, 101, 0.15);

  --c-border: #1E1E1C;
  --c-border-light: #D0CBBF;
  --c-border-subtle: rgba(240, 236, 229, 0.08);

  /* Typography */
  --f-display: 'Instrument Serif', Georgia, serif;
  --f-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --s-section: clamp(80px, 10vw, 140px);
  --s-section-half: clamp(40px, 5vw, 70px);
  --s-container: clamp(20px, 4vw, 80px);

  /* Sizing */
  --max-width: 1240px;

  /* Transitions */
  --t-base: 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
  --t-smooth: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--f-body);
  background-color: var(--c-bg-primary);
  color: var(--c-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--s-container);
}

/* --- Typography Utilities --- */
.section-label {
  display: inline-block;
  font-family: var(--f-body);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-accent-gold);
  margin-bottom: 1.5rem;
}

.section-title {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.section-subtitle {
  font-family: var(--f-body);
  font-size: clamp(1rem, 1.15vw, 1.2rem);
  font-weight: 300;
  line-height: 1.7;
  color: var(--c-text-secondary);
  max-width: 600px;
}

.section-header {
  text-align: center;
  margin-bottom: clamp(3rem, 5vw, 5rem);
}

.section-header .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

.section-header--left {
  text-align: left;
}

.section-header--left .section-subtitle {
  margin-left: 0;
}

/* --- Section Base --- */
.section {
  padding: var(--s-section) 0;
  position: relative;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--f-body);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  border: none;
  cursor: pointer;
  transition: all var(--t-base);
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background-color: var(--c-text-primary);
  color: var(--c-bg-primary);
  padding: 1rem 2rem;
  border-radius: 0;
}

.btn--primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background-color: var(--c-accent-gold);
  transform: translateY(101%);
  transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn--primary:hover::before {
  transform: translateY(0);
}

.btn--primary span,
.btn--primary svg {
  position: relative;
  z-index: 1;
}

.btn--primary:hover {
  color: var(--c-bg-primary);
}

.btn--primary svg {
  transition: transform var(--t-base);
}

.btn--primary:hover svg {
  transform: translateX(4px);
}

.btn--ghost {
  background: transparent;
  color: var(--c-text-primary);
  padding: 1rem 0;
  border-bottom: 1px solid var(--c-border-subtle);
  border-radius: 0;
}

.btn--ghost:hover {
  border-bottom-color: var(--c-accent-gold);
  color: var(--c-accent-gold);
}

.btn--large {
  padding: 1.15rem 2.5rem;
  font-size: 0.95rem;
}

.btn--small {
  padding: 0.7rem 1.5rem;
  font-size: 0.8rem;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 var(--s-container);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav.scrolled {
  background-color: rgba(11, 11, 11, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border-subtle);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-family: var(--f-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.35em;
  color: var(--c-text-primary);
  transition: opacity var(--t-base);
}

.nav-logo:hover {
  opacity: 0.7;
}

.nav-cta {
  font-family: var(--f-body);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--c-text-secondary);
  transition: color var(--t-base);
  padding: 0.6rem 0;
  border-bottom: 1px solid transparent;
}

.nav-cta:hover {
  color: var(--c-text-primary);
  border-bottom-color: var(--c-accent-gold);
}

/* ============================================
   HERO
   ============================================ */
.section--hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  position: relative;
  overflow: hidden;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(11, 11, 11, 0.92) 0%,
    rgba(11, 11, 11, 0.6) 50%,
    rgba(11, 11, 11, 0.3) 100%
  );
  z-index: 1;
  pointer-events: none;
}

.hero-container {
  position: relative;
  z-index: 2;
  width: 100%;
}

.hero-content {
  max-width: 720px;
  padding: clamp(2rem, 5vw, 5rem) 0;
}

.hero-label {
  display: inline-block;
  font-family: var(--f-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--c-accent-gold);
  margin-bottom: 2rem;
  opacity: 0;
}

.hero-headline {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--c-text-primary);
  margin-bottom: 2rem;
  min-height: 2.4em;
  position: relative;
}

.typing-wrapper {
  display: inline;
}

.typing-cursor {
  display: inline-block;
  font-weight: 200;
  color: var(--c-accent-gold);
  animation: cursorBlink 1s steps(1) infinite;
  margin-left: 2px;
  font-family: var(--f-body);
}

@keyframes cursorBlink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero-sub {
  font-size: clamp(1rem, 1.2vw, 1.15rem);
  font-weight: 300;
  line-height: 1.75;
  color: var(--c-text-secondary);
  max-width: 560px;
  margin-bottom: 2.5rem;
  opacity: 0;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  opacity: 0;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  opacity: 0;
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--c-accent-gold), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================
   PROOF / NUMBERS
   ============================================ */
.section--proof {
  padding: var(--s-section-half) 0;
  border-top: 1px solid var(--c-border-subtle);
  border-bottom: 1px solid var(--c-border-subtle);
  background-color: var(--c-bg-primary);
}

.proof-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.proof-item {
  flex: 1;
  text-align: center;
  padding: 1.5rem 1rem;
  opacity: 0;
}

.proof-divider {
  width: 1px;
  height: 50px;
  background-color: var(--c-border-subtle);
  flex-shrink: 0;
}

.proof-number {
  font-family: var(--f-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 400;
  line-height: 1;
  color: var(--c-text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.proof-label {
  font-family: var(--f-body);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}

/* ============================================
   PROBLEM
   ============================================ */
.section--problem {
  background-color: var(--c-bg-light);
  color: var(--c-text-dark);
}

.section--problem .section-label {
  color: var(--c-accent);
}

.section--problem .section-title {
  color: var(--c-text-dark);
}

.section--problem .section-subtitle {
  color: var(--c-text-dark-secondary);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--c-border-light);
}

.problem-item {
  padding: clamp(2rem, 3vw, 3rem);
  border-bottom: 1px solid var(--c-border-light);
  position: relative;
  opacity: 0;
}

.problem-item:nth-child(odd) {
  border-right: 1px solid var(--c-border-light);
}

.problem-index {
  display: block;
  font-family: var(--f-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--c-accent);
  margin-bottom: 1.25rem;
}

.problem-title {
  font-family: var(--f-display);
  font-size: clamp(1.2rem, 1.8vw, 1.5rem);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--c-text-dark);
}

.problem-desc {
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 1.65;
  color: var(--c-text-dark-secondary);
}

/* ============================================
   SOLUTION
   ============================================ */
.section--solution {
  background-color: var(--c-bg-primary);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--c-border-subtle);
  margin-bottom: 3rem;
}

.solution-item {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--c-border-subtle);
  border-right: 1px solid var(--c-border-subtle);
  position: relative;
  opacity: 0;
  transition: background-color 0.4s ease;
}

.solution-item:nth-child(3n) {
  border-right: none;
}

.solution-item:hover {
  background-color: var(--c-bg-secondary);
}

.solution-title {
  font-family: var(--f-display);
  font-size: clamp(1.15rem, 1.5vw, 1.35rem);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--c-text-primary);
  transition: color var(--t-base);
}

.solution-item:hover .solution-title {
  color: var(--c-accent-gold);
}

.solution-desc {
  font-size: 0.9rem;
  font-weight: 300;
  line-height: 1.65;
  color: var(--c-text-secondary);
}

.solution-cta {
  text-align: left;
  opacity: 0;
}

/* ============================================
   PROCESS
   ============================================ */
.section--process {
  background-color: var(--c-bg-secondary);
}

.process-timeline {
  position: relative;
  padding-left: clamp(3rem, 5vw, 6rem);
}

.process-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: clamp(1rem, 2vw, 2.2rem);
  width: 1px;
  background-color: var(--c-border-subtle);
}

.process-line-fill {
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--c-accent-gold), var(--c-accent));
  transition: height 0.1s linear;
}

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.process-step {
  display: flex;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding: clamp(2rem, 3vw, 3rem) 0;
  border-bottom: 1px solid var(--c-border-subtle);
  opacity: 0;
  position: relative;
}

.process-step:last-child {
  border-bottom: none;
}

.step-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.step-number {
  font-family: var(--f-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  color: var(--c-accent-gold);
  line-height: 1;
}

.step-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--c-accent-gold);
  position: absolute;
  left: calc(clamp(1rem, 2vw, 2.2rem) * -1 - clamp(3rem, 5vw, 6rem) + clamp(1rem, 2vw, 2.2rem));
  top: clamp(2.5rem, 3.5vw, 3.5rem);
  transform: translateX(-50%);
  left: calc(-1 * clamp(3rem, 5vw, 6rem) + clamp(1rem, 2vw, 2.2rem));
}

.step-content {
  flex: 1;
}

.step-title {
  font-family: var(--f-display);
  font-size: clamp(1.3rem, 2vw, 1.75rem);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  color: var(--c-text-primary);
}

.step-desc {
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--c-text-secondary);
  max-width: 500px;
}

/* ============================================
   WHY COLUMMA
   ============================================ */
.section--why {
  background-color: var(--c-bg-light);
  color: var(--c-text-dark);
}

.section--why .section-label {
  color: var(--c-accent);
}

.section--why .section-title {
  color: var(--c-text-dark);
}

.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--c-border-light);
}

.why-item {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: clamp(1rem, 3vw, 3rem);
  padding: clamp(1.5rem, 2.5vw, 2.5rem) 0;
  border-bottom: 1px solid var(--c-border-light);
  align-items: start;
  opacity: 0;
}

.why-title {
  font-family: var(--f-display);
  font-size: clamp(1.15rem, 1.5vw, 1.4rem);
  font-weight: 400;
  line-height: 1.3;
  color: var(--c-text-dark);
}

.why-desc {
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--c-text-dark-secondary);
}

/* ============================================
   AUDIENCE
   ============================================ */
.section--audience {
  background-color: var(--c-bg-primary);
}

.audience-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 6vw, 8rem);
  align-items: start;
}

.audience-left .section-title {
  margin-bottom: 1.5rem;
}

.audience-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 3rem;
}

.audience-item {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--c-border-subtle);
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--c-text-secondary);
  opacity: 0;
}

.audience-item:first-child {
  border-top: 1px solid var(--c-border-subtle);
}

.audience-marker {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--c-accent-gold);
  margin-top: 0.55rem;
  flex-shrink: 0;
}

.audience-quote {
  padding-left: 1.5rem;
  border-left: 2px solid var(--c-accent-gold);
  opacity: 0;
}

.audience-quote p {
  font-family: var(--f-display);
  font-style: italic;
  font-size: clamp(1.1rem, 1.5vw, 1.35rem);
  line-height: 1.5;
  color: var(--c-text-primary);
}

/* ============================================
   CTA FINAL
   ============================================ */
.section--cta {
  background-color: var(--c-bg-tertiary);
  text-align: center;
  padding: clamp(100px, 12vw, 180px) 0;
  position: relative;
  overflow: hidden;
}

.section--cta::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--c-accent-gold-dim) 0%, transparent 70%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-headline {
  font-family: var(--f-display);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  opacity: 0;
}

.cta-sub {
  font-size: clamp(1rem, 1.2vw, 1.15rem);
  font-weight: 300;
  line-height: 1.7;
  color: var(--c-text-secondary);
  max-width: 520px;
  margin: 0 auto 2.5rem;
  opacity: 0;
}

.cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  opacity: 0;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background-color: var(--c-bg-primary);
  border-top: 1px solid var(--c-border-subtle);
  padding: 3rem 0 2rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 3rem;
}

.footer-logo {
  font-family: var(--f-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.35em;
  color: var(--c-text-primary);
}

.footer-tagline {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--c-text-muted);
  margin-top: 0.5rem;
}

.footer-bottom {
  border-top: 1px solid var(--c-border-subtle);
  padding-top: 1.5rem;
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--c-text-muted);
  letter-spacing: 0.03em;
}

/* ============================================
   REVEAL ANIMATION BASE (set by GSAP)
   ============================================ */
.reveal-element {
  opacity: 0;
  transform: translateY(30px);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .solution-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .solution-item:nth-child(3n) {
    border-right: 1px solid var(--c-border-subtle);
  }

  .solution-item:nth-child(2n) {
    border-right: none;
  }

  .audience-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .proof-grid {
    flex-wrap: wrap;
    gap: 0;
  }

  .proof-item {
    flex: 1 1 calc(50% - 1px);
    min-width: 140px;
  }

  .proof-divider {
    display: none;
  }

  .proof-item:nth-child(odd)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 20%;
    height: 60%;
    width: 1px;
    background-color: var(--c-border-subtle);
  }

  .proof-item {
    position: relative;
    border-bottom: 1px solid var(--c-border-subtle);
  }

  .proof-item:nth-last-child(-n+2) {
    border-bottom: none;
  }

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

  .problem-item:nth-child(odd) {
    border-right: none;
  }

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

  .solution-item {
    border-right: none !important;
  }

  .why-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .hero-headline {
    min-height: 3.2em;
  }

  .process-timeline {
    padding-left: 0;
  }

  .process-line {
    display: none;
  }

  .step-dot {
    display: none;
  }

  .process-step {
    flex-direction: column;
    gap: 0.75rem;
  }

  .step-marker {
    flex-direction: row;
    gap: 0.75rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .cta-actions {
    flex-direction: column;
    gap: 1rem;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .proof-item {
    flex: 1 1 100%;
  }

  .proof-item:nth-child(odd)::after {
    display: none;
  }

  .nav-inner {
    height: 60px;
  }

  .section--hero {
    padding-top: 60px;
  }
}

/* ============================================
   SELECTION & SCROLLBAR
   ============================================ */
::selection {
  background-color: var(--c-accent-gold);
  color: var(--c-bg-primary);
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--c-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--c-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--c-text-muted);
}