/*
 * TradeTransco Main Stylesheet
 * Modern, minimalist design for logistics and trading company
 */

/* ===================================
   CSS VARIABLES & DESIGN SYSTEM
   =================================== */

:root {
  /* Colors - From logo and brand */
  --primary-gold: #C9A55B;
  --primary-dark: #1A2C2E;
  --primary-teal: #2D4F4F;
  --accent-blue: #478AC9;

  /* Neutral Colors */
  --white: #FFFFFF;
  --off-white: #F8F9FA;
  --light-gray: #E9ECEF;
  --mid-gray: #6C757D;
  --dark-gray: #343A40;
  --black: #000000;

  /* Semantic Colors */
  --success: #28A745;
  --error: #DC3545;
  --warning: #FFC107;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, rgba(26, 44, 46, 0.95), rgba(45, 79, 79, 0.85));
  --gradient-overlay: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.3));
  --gradient-gold: linear-gradient(135deg, #C9A55B, #D4B66E);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;

  /* Font Sizes - Fluid Typography */
  --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 + 0.5vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.25rem + 1vw, 2rem);
  --text-2xl: clamp(2rem, 1.5rem + 2vw, 3rem);
  --text-3xl: clamp(2.5rem, 2rem + 2.5vw, 4rem);

  /* Line Heights */
  --leading-tight: 1.2;
  --leading-normal: 1.6;
  --leading-loose: 1.8;

  /* Font Weights */
  --weight-light: 300;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Spacing - 8px base unit */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 8rem;

  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-base: 1;
  --z-dropdown: 10;
  --z-sticky: 100;
  --z-fixed: 200;
  --z-modal: 1000;
  --z-tooltip: 2000;
}

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

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

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

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--dark-gray);
  background-color: var(--white);
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  color: var(--primary-dark);
  margin-bottom: var(--space-3);
}

h1 {
  font-size: var(--text-3xl);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

p {
  margin-bottom: var(--space-3);
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--primary-gold);
}

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

ul, ol {
  list-style: none;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

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

.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.nav-bar[data-state="top"] {
  background-color: transparent;
}

.nav-bar[data-state="scrolled"] {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  transition: height var(--transition-base);
}

.nav-bar[data-state="scrolled"] .nav-container {
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 50px;
  width: auto;
  transition: height var(--transition-base);
}

.nav-bar[data-state="scrolled"] .logo img {
  height: 40px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  font-weight: var(--weight-medium);
  font-size: var(--text-sm);
  color: var(--white);
  padding: var(--space-2);
  position: relative;
  transition: color var(--transition-base);
}

.nav-bar[data-state="scrolled"] .nav-link {
  color: var(--primary-dark);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--primary-gold);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
}

.nav-link.btn-primary-nav {
  background: var(--gradient-gold);
  color: var(--white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
}

.nav-link.btn-primary-nav::after {
  display: none;
}

.nav-link.btn-primary-nav:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}

.hamburger {
  width: 25px;
  height: 2px;
  background-color: var(--white);
  transition: all var(--transition-base);
}

.nav-bar[data-state="scrolled"] .hamburger {
  background-color: var(--primary-dark);
}

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

.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: var(--primary-dark);
}

.hero-background {
  position: absolute;
  inset: 0;
  background-image: url('../images/cargoship.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 1;
}

.hero-container {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: var(--space-8) 0;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: var(--text-3xl);
  color: var(--white);
  margin-bottom: var(--space-4);
  letter-spacing: 0.5px;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.9);
  line-height: var(--leading-loose);
  margin-bottom: var(--space-6);
}

.hero-cta {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-sm);
}

.hero-scroll-indicator svg {
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  text-decoration: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient-gold);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  color: var(--white);
}

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

.btn-outline:hover {
  background-color: var(--white);
  color: var(--primary-dark);
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-lg);
}

/* ===================================
   SECTION STYLES
   =================================== */

section {
  padding: var(--space-8) 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-7);
}

.section-header h2 {
  margin-bottom: var(--space-3);
}

.section-header p {
  font-size: var(--text-lg);
  color: var(--mid-gray);
  margin-bottom: 0;
}

/* ===================================
   SERVICES SECTION
   =================================== */

.services-section {
  background-color: var(--off-white);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
}

.service-card {
  background: var(--white);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  text-align: center;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl);
}

.service-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-gold), var(--accent-blue));
  border-radius: var(--radius-lg);
  color: var(--white);
}

.service-icon svg {
  width: 40px;
  height: 40px;
}

.service-card h3 {
  margin-bottom: var(--space-3);
  font-size: var(--text-xl);
}

.service-card p {
  color: var(--mid-gray);
  margin-bottom: var(--space-4);
}

.service-link {
  color: var(--primary-gold);
  font-weight: var(--weight-semibold);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  transition: gap var(--transition-base);
}

.service-link:hover {
  gap: var(--space-2);
}

/* ===================================
   PRODUCTS SECTION
   =================================== */

.products-section {
  background-color: var(--primary-dark);
  color: var(--white);
}

.products-section .section-header h2,
.products-section .section-header p {
  color: var(--white);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}

.product-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-base);
}

.product-card:hover {
  transform: scale(1.02);
}

.product-image-wrapper {
  position: relative;
  width: 100%;
  height: 350px;
  overflow: hidden;
}

.product-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.product-card:hover .product-image-wrapper img {
  transform: scale(1.1);
}

.product-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26, 44, 46, 0.95), rgba(26, 44, 46, 0.7));
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-5);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-base);
}

.product-card:hover .product-overlay {
  opacity: 1;
  transform: translateY(0);
}

.product-overlay h3 {
  color: var(--primary-gold);
  margin-bottom: var(--space-3);
  font-size: var(--text-xl);
}

.product-overlay ul {
  list-style: none;
}

.product-overlay li {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-2);
  padding-left: var(--space-3);
  position: relative;
}

.product-overlay li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--primary-gold);
}

/* ===================================
   SERVICE DETAIL SECTIONS
   =================================== */

.service-detail {
  padding: var(--space-8) 0;
}

.service-detail.alt-bg {
  background-color: var(--off-white);
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-7);
  align-items: center;
  margin-bottom: var(--space-8);
}

.detail-grid.reverse {
  margin-top: var(--space-8);
}

.detail-label {
  display: inline-block;
  background: var(--gradient-gold);
  color: var(--white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-3);
}

.detail-content h2 {
  margin-bottom: var(--space-4);
}

.detail-content h3 {
  margin-bottom: var(--space-3);
}

.detail-content p {
  color: var(--mid-gray);
  margin-bottom: var(--space-4);
}

.feature-list {
  margin: var(--space-5) 0;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  padding: var(--space-3);
  background: var(--off-white);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.feature-list li:hover {
  background: var(--light-gray);
  transform: translateX(5px);
}

.feature-list svg {
  width: 24px;
  height: 24px;
  color: var(--primary-gold);
  flex-shrink: 0;
}

.feature-list span {
  font-weight: var(--weight-medium);
  color: var(--primary-dark);
}

.detail-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.detail-image img {
  width: 100%;
  height: auto;
  display: block;
}

.detail-highlight {
  background: var(--gradient-gold);
  color: var(--white);
  padding: var(--space-7);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.detail-highlight.dark {
  background: var(--primary-dark);
}

.highlight-content {
  max-width: 900px;
  margin: 0 auto;
}

.detail-highlight h3 {
  color: var(--white);
  margin-bottom: var(--space-4);
}

.detail-highlight p {
  color: rgba(255, 255, 255, 0.95);
  font-size: var(--text-lg);
}

/* ===================================
   WHY CHOOSE US SECTION
   =================================== */

.why-us-section {
  background-color: var(--off-white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.stat-card {
  background: var(--white);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.stat-number {
  display: block;
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--primary-gold);
  line-height: 1;
}

.stat-plus {
  display: inline-block;
  font-size: var(--text-2xl);
  color: var(--primary-gold);
  margin-left: var(--space-1);
}

.stat-label {
  display: block;
  margin-top: var(--space-3);
  color: var(--mid-gray);
  font-weight: var(--weight-medium);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}

.benefit-card {
  background: var(--white);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.benefit-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-gold);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.benefit-icon svg {
  width: 30px;
  height: 30px;
  color: var(--white);
}

.benefit-card h3 {
  margin-bottom: var(--space-3);
}

.benefit-card p {
  color: var(--mid-gray);
  margin-bottom: 0;
}

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

.contact-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-teal));
  color: var(--white);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-7);
  align-items: start;
}

.contact-info h2 {
  color: var(--white);
  margin-bottom: var(--space-4);
}

.contact-info p {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--text-lg);
  margin-bottom: var(--space-6);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
}

.contact-item svg {
  width: 24px;
  height: 24px;
  color: var(--primary-gold);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-item h4 {
  color: var(--primary-gold);
  font-size: var(--text-sm);
  margin-bottom: var(--space-1);
}

.contact-item p,
.contact-item a {
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
}

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

/* Contact Form */
.contact-form {
  background: var(--white);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: var(--weight-semibold);
  color: var(--primary-dark);
}

.required {
  color: var(--error);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-3);
  border: 2px solid var(--light-gray);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-gold);
  box-shadow: 0 0 0 3px rgba(201, 165, 91, 0.1);
}

.form-group.error input,
.form-group.error textarea {
  border-color: var(--error);
}

.form-group.valid input,
.form-group.valid textarea {
  border-color: var(--success);
}

.form-group .error-message {
  display: none;
  color: var(--error);
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

.form-group.error .error-message {
  display: block;
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.btn-submit {
  width: 100%;
  position: relative;
}

.btn-loading {
  display: none;
  align-items: center;
  gap: var(--space-2);
}

.btn-submit.loading .btn-text {
  display: none;
}

.btn-submit.loading .btn-loading {
  display: flex;
}

.spinner {
  width: 20px;
  height: 20px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.form-messages {
  margin-top: var(--space-4);
}

.success-message,
.error-message-box {
  display: none;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  margin-top: var(--space-3);
}

.success-message {
  background-color: rgba(40, 167, 69, 0.1);
  border: 2px solid var(--success);
  color: var(--success);
}

.error-message-box {
  background-color: rgba(220, 53, 69, 0.1);
  border: 2px solid var(--error);
  color: var(--error);
}

.success-message.show,
.error-message-box.show {
  display: flex;
}

.success-message svg,
.error-message-box svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

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

.footer {
  background-color: var(--primary-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--space-8) 0 var(--space-4);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.footer-logo {
  width: 100px;
  height: auto;
  margin-bottom: var(--space-3);
}

.footer-column h4 {
  color: var(--white);
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}

.footer-column p {
  font-size: var(--text-sm);
  line-height: var(--leading-loose);
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-column a {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.footer-column a:hover {
  color: var(--primary-gold);
  padding-left: var(--space-1);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-4);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--text-sm);
  margin: 0;
  color: rgba(255, 255, 255, 0.6);
}

/* ===================================
   ACCESSIBILITY
   =================================== */

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus Indicators */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--primary-gold);
  outline-offset: 2px;
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}