/* ============================================
   ISTMO ENERGY LLC - Monochromatic Dark Theme
   Inspired by modern financial services design
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */

:root {
  /* Monochromatic Colors */
  --black: #000000;
  --gray-900: #0a0a0a;
  --gray-800: #1a1a1a;
  --gray-700: #2a2a2a;
  --gray-600: #3a3a3a;
  --gray-500: #5a5a5a;
  --gray-400: #7a7a7a;
  --gray-300: #9a9a9a;
  --gray-200: #c0c0c0;
  --gray-100: #e0e0e0;
  --white: #ffffff;

  /* Typography */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Monaco', 'Courier New', monospace;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Layout */
  --max-width: 1280px;
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

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

body {
  font-family: var(--font-body);
  color: var(--gray-100);
  background-color: #1d191d;
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--white);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.75rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--gray-200);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--white);
}

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

/* ============================================
   CONTAINER
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  position: relative;
}

/* ============================================
   NAVIGATION BAR
   ============================================ */

.navbar {
  background: var(--black);
  padding: var(--spacing-sm) var(--spacing-lg);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.menu-icon {
  display: flex;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: 4px;
}

.menu-icon span {
  width: 20px;
  height: 2px;
  background-color: var(--white);
  border-radius: 1px;
  transition: all 0.3s ease;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--black);
  position: relative;
  overflow: hidden;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.hero-container {
  display: grid;
  grid-template-columns: repeat(6, min(13.5vw, 161px));
  gap: min(1.34vw, 16px);
  max-width: 1400px;
  align-items: center;
  padding: 0 min(1vw, 10px);
}

.hero-content {
  grid-column: 1 / 4;
  display: flex;
  align-items: center;
  gap: min(1.34vw, 16px);
  padding-right: 0;
  background: var(--black);
  border: 1.5px solid var(--gray-700);
  padding: min(1.34vw, 16px);
  height: min(13.5vw, 161px);
}

.hero-logo {
  height: min(9.14vw, 109px);
  width: auto;
  object-fit: contain;
  margin-top: 10px;
}

.hero-text {
  text-align: left;
}

.hero-content h1 {
  color: var(--white);
  font-size: min(5.36vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-xs);
  margin-left: 0;
  white-space: nowrap;
}

.hero-content .subtitle {
  color: var(--gray-200);
  font-size: min(1.26vw, 0.94rem);
  font-weight: 300;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-align: left;
  margin-left: 0.5px;
  padding-left: 0;
}

.image-item {
  width: min(13.5vw, 161px);
  height: min(13.5vw, 161px);
  background: var(--black);
  border: 1.5px solid var(--gray-700);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.image-item img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: min(0.17vw, 2px);
}

.image-item img[src*="Butan_Lewis"] {
  padding: min(2.43vw, 29px);
}

.image-item img[src*="003-methane"] {
  padding: min(2.6vw, 31px);
}

.image-item img[src*="025-ethane"] {
  padding: min(1vw, 12px);
}

.image-item img[src*="Toluene"] {
  padding: min(3.35vw, 40px);
}

.image-item img[src*="Heptane"] {
  padding: min(0.75vw, 9px);
}

.image-item img[src*="cyclohexane"] {
  padding: min(3.35vw, 40px);
}

.image-item img[src*="Benzene"] {
  padding: min(3.35vw, 40px);
}

.image-item img[src*="Nonane"] {
  padding: min(0.75vw, 9px);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   TYPEWRITER EFFECT STYLES
   ============================================ */

/* Typewriter.js wrapper styles */
.Typewriter__wrapper {
  color: var(--gray-200);
  margin-left: 0.5px;
  padding-left: 0;
}

/* Typewriter.js cursor */
.Typewriter__cursor {
  color: var(--white);
  margin-left: 2px;
  animation: Typewriter-cursor-mobile 1s steps(1, end) infinite !important;
  display: inline-block;
  transform: translateY(-4px) scaleX(0.6);
}

@media (max-width: 768px) {
  .Typewriter__cursor:not(.visible) {
    animation-play-state: paused !important;
    opacity: 0 !important;
  }

  .Typewriter__cursor.visible {
    animation-play-state: paused !important;
    opacity: 1;
  }

  .Typewriter__cursor.blinking {
    animation-play-state: running !important;
  }
}

@keyframes Typewriter-cursor-mobile {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

@media (min-width: 769px) {
  .Typewriter__cursor {
    animation: none !important;
    opacity: 0;
  }

  .Typewriter__cursor.visible {
    opacity: 1;
  }

  .Typewriter__cursor.blinking {
    animation: Typewriter-cursor 1s steps(1, end) infinite !important;
  }
}

@keyframes Typewriter-cursor {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* ============================================
   BUTTONS
   ============================================ */

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease 2.8s backwards;
  position: relative;
  z-index: 3;
  margin-top: auto;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  font-weight: 600;
  font-size: 1.125rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-normal);
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-700) 100%);
  color: var(--white);
  border: 2px solid var(--gray-600);
  box-shadow: var(--shadow-lg);
  font-size: 1.25rem;
  padding: 1.25rem 3rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(135deg, var(--gray-600) 0%, var(--gray-400) 100%);
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
  border-color: var(--gray-500);
}

.btn-primary:active {
  transform: translateY(-2px);
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about {
  background: var(--black);
  padding: var(--spacing-3xl) 0;
  position: relative;
  overflow: hidden;
}

.about::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--gray-700) 50%, transparent 100%);
}

.about .container {
  max-width: 1400px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-lg);
  padding-right: 0;
  position: relative;
  overflow: hidden;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  align-items: center;
  position: relative;
  padding-left: 0;
}

.about-text {
  position: relative;
  z-index: 2;
  padding: var(--spacing-2xl);
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-3xl);
  background: linear-gradient(135deg, rgba(26, 26, 26, 0.4) 0%, rgba(10, 10, 10, 0.2) 100%);
  border-left: 2px solid transparent;
  border-image: linear-gradient(180deg, transparent 0%, var(--gray-600) 30%, var(--gray-600) 70%, transparent 100%) 1;
  backdrop-filter: blur(10px);
}

.about-text::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100px;
  width: 200px;
  height: 100%;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.03) 50%, transparent 100%);
  transform: skewX(-20deg);
  pointer-events: none;
}

.about-text::after {
  content: '';
  position: absolute;
  top: 40px;
  left: 0;
  width: 4px;
  height: 60px;
  background: linear-gradient(180deg, var(--gray-400) 0%, transparent 100%);
  opacity: 0.6;
}

.about h2 {
  color: var(--white);
  margin-bottom: var(--spacing-lg);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  position: relative;
  text-transform: uppercase;
  background: linear-gradient(135deg, var(--white) 0%, var(--gray-300) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  min-height: 3rem;
}

.about h2::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 0;
  width: 100px;
  height: 2px;
  background: linear-gradient(90deg, var(--gray-400) 0%, var(--gray-600) 50%, transparent 100%);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.about p {
  color: var(--gray-200);
  font-size: 1.15rem;
  line-height: 1.9;
  text-align: justify;
  margin-top: var(--spacing-lg);
  font-weight: 300;
  letter-spacing: 0.01em;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.about-image {
  position: relative;
  width: 100%;
  height: 450px;
  z-index: 1;
  clip-path: polygon(15% 0%, 100% 0%, 100% 100%, 0% 100%);
  overflow: hidden;
  box-shadow: -20px 0 40px rgba(0, 0, 0, 0.5);
}

.about-image::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.4) 0%, transparent 40%, rgba(255, 255, 255, 0.05) 100%);
  z-index: 2;
  mix-blend-mode: overlay;
}

.about-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  clip-path: polygon(15% 0%, 100% 0%, 100% 100%, 0% 100%);
  z-index: 3;
  pointer-events: none;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: grayscale(30%) contrast(1.15) brightness(0.95);
  transform: scale(1.05);
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact {
  background: #1d191d;
  position: relative;
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-lg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.contact-info-left h2,
.contact-info-right h2 {
  color: var(--white);
  margin-bottom: var(--spacing-lg);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.contact-info-left p {
  color: var(--gray-200);
  font-size: 1.1rem;
  line-height: 1.8;
  font-weight: 300;
}

.contact-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md) var(--spacing-lg);
}

.contact-item h3 {
  color: var(--white);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-item p {
  color: var(--gray-300);
  line-height: 1.5;
  margin-bottom: 0.2rem;
  font-size: 0.9rem;
}

.contact-item a {
  color: var(--gray-300);
  text-decoration: none;
  transition: color 0.2s ease;
}

.contact-item a:hover {
  color: var(--white);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--gray-800);
  color: var(--gray-400);
  font-size: 0.9rem;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
  h1 { font-size: 3rem; }
  h2 { font-size: 2.25rem; }
  h3 { font-size: 1.75rem; }

  .about h2 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-3xl: 3rem;
    --spacing-2xl: 2.5rem;
  }

  h2 { font-size: 1.65rem; }
  h3 { font-size: 1.5rem; }

  .about h2 {
    font-size: 1.3rem;
    color: var(--white);
  }

  .Typewriter__cursor {
    transform: translateY(-1px) scaleX(0.6);
  }

  .hero {
    padding: 6.5rem var(--spacing-sm) var(--spacing-sm) var(--spacing-sm);
    min-height: auto;
  }

  .hero-container {
    grid-template-columns: repeat(6, min(14.5vw, 90px));
    gap: min(1.2vw, 9px);
    padding: 0 min(0.5vw, 3px);
  }

  .hero-content {
    grid-column: 1 / 4;
    gap: min(1.2vw, 9px);
    padding: min(1.2vw, 9px);
    border-width: 2px;
    height: min(14.5vw, 90px);
  }

  .hero-logo {
    height: min(10.5vw, 68px);
    transform: translateY(-4px);
  }

  .hero-content h1 {
    font-size: min(5.16vw, 2rem);
    white-space: nowrap;
  }

  .hero-content .subtitle {
    font-size: min(1.2vw, 0.46rem);
    white-space: nowrap;
  }

  .image-item {
    width: min(14.5vw, 90px);
    height: min(14.5vw, 90px);
    border-width: 2px;
  }

  .image-item img[src*="Butan_Lewis"] {
    padding: min(2.5vw, 16px);
  }

  .image-item img[src*="003-methane"] {
    padding: min(2.7vw, 17px);
  }

  .image-item img[src*="025-ethane"] {
    padding: min(1.1vw, 7px);
  }

  .image-item img[src*="Toluene"] {
    padding: min(3.5vw, 22px);
  }

  .image-item img[src*="Heptane"] {
    padding: min(0.8vw, 5px);
  }

  .image-item img[src*="cyclohexane"] {
    padding: min(3.5vw, 22px);
  }

  .image-item img[src*="Benzene"] {
    padding: min(3.5vw, 22px);
  }

  .image-item img[src*="Nonane"] {
    padding: min(0.8vw, 5px);
  }

  .about {
    padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
  }

  .about h2 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    min-height: 1.6rem;
  }

  .about p {
    font-size: 0.8rem;
    text-align: left;
    line-height: 1.7;
  }

  .about-text {
    padding: var(--spacing-lg);
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-lg);
  }

  .about-text::before {
    left: -50px;
    width: 100px;
  }

  .about-text::after {
    width: 3px;
    height: 40px;
  }

  .about-image {
    height: 300px;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .about .container {
    padding-left: 0;
  }

  .contact {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .contact-info-left h2,
  .contact-info-right h2 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
  }

  .contact-info-left p {
    font-size: 0.9rem;
    line-height: 1.6;
  }

  .contact-details {
    gap: var(--spacing-sm);
  }

  .contact-item h3 {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
  }

  .contact-item p {
    font-size: 0.8rem;
    line-height: 1.5;
    margin-bottom: 0.25rem;
  }
}

@media (max-width: 480px) {
  h2 { font-size: 1.4rem; }

  .about h2 {
    font-size: 1.2rem;
    color: var(--white);
  }

  .Typewriter__cursor {
    transform: translateY(-1px) scaleX(0.6);
  }

  .hero {
    padding-top: 5.5rem;
    padding-bottom: var(--spacing-sm);
    min-height: auto;
  }

  .hero-container {
    grid-template-columns: repeat(6, min(14.5vw, 70px));
    gap: min(1.45vw, 7px);
    padding: 0 min(0.4vw, 2px);
  }

  .hero-content {
    grid-column: 1 / 4;
    gap: min(1.45vw, 7px);
    padding: min(1.45vw, 7px);
    border-width: 2px;
    height: min(14.5vw, 70px);
  }

  .hero-logo {
    height: min(11vw, 53px);
    transform: translateY(-4px);
  }

  .hero-content h1 {
    font-size: min(5.16vw, 2rem);
    white-space: nowrap;
  }

  .hero-content .subtitle {
    font-size: min(1.15vw, 0.44rem);
    white-space: nowrap;
  }

  .image-item {
    width: min(14.5vw, 70px);
    height: min(14.5vw, 70px);
    border-width: 2px;
  }

  .image-item img[src*="Butan_Lewis"] {
    padding: min(2.7vw, 13px);
  }

  .image-item img[src*="003-methane"] {
    padding: min(2.7vw, 13px);
  }

  .image-item img[src*="025-ethane"] {
    padding: min(1vw, 5px);
  }

  .image-item img[src*="Toluene"] {
    padding: min(3.5vw, 17px);
  }

  .image-item img[src*="Heptane"] {
    padding: min(0.8vw, 4px);
  }

  .image-item img[src*="cyclohexane"] {
    padding: min(3.5vw, 17px);
  }

  .image-item img[src*="Benzene"] {
    padding: min(3.5vw, 17px);
  }

  .image-item img[src*="Nonane"] {
    padding: min(0.8vw, 4px);
  }

  .about {
    padding: var(--spacing-lg) 0 var(--spacing-md) 0;
  }

  .about h2 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    min-height: 1.5rem;
  }

  .about p {
    font-size: 0.75rem;
    text-align: left;
    line-height: 1.6;
  }

  .about-text {
    padding: var(--spacing-md);
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-md);
  }

  .about-text::before {
    display: none;
  }

  .about-text::after {
    width: 2px;
    height: 30px;
    top: 20px;
  }

  .about-image {
    height: 250px;
  }

  .about .container {
    padding-left: 0;
  }

  .contact {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .contact-grid {
    gap: var(--spacing-md);
  }

  .contact-info-left h2,
  .contact-info-right h2 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
  }

  .contact-info-left p {
    font-size: 0.85rem;
    line-height: 1.5;
  }

  .contact-details {
    gap: var(--spacing-xs);
  }

  .contact-item h3 {
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
  }

  .contact-item p {
    font-size: 0.75rem;
    line-height: 1.4;
    margin-bottom: 0.2rem;
  }

  .section-title {
    font-size: 2rem;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes slideInUp {
  0% {
    opacity: 0;
    transform: translateY(30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}