/* ==========================================================================
   Lott Ship Agency - Main CSS
   Professional Maritime Services Website
   ========================================================================== */

/* CSS Variables - Design System */
:root {
  /* Colors */
  --color-primary: #1a2332;
  --color-secondary: #2563eb;
  --color-accent: #f59e0b;
  --color-success: #10b981;
  --color-text: #374151;
  --color-text-light: #6b7280;
  --color-white: #ffffff;
  --color-bg-light: #f9fafb;
  --color-bg-dark: #111827;
  --color-border: #e5e7eb;
  
  /* Typography */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Open Sans', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 5rem;
  
  /* Section spacing */
  --section-padding-mobile: 2.5rem;
  --section-padding-tablet: 3.75rem;
  --section-padding-desktop: 5rem;
  
  /* Container */
  --container-max-width: 1200px;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  
  /* 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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-base: all 0.3s ease;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

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

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

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

.text-center {
  text-align: center;
}

.text-light {
  color: var(--color-text-light);
}

/* ==========================================================================
   Layout Components
   ========================================================================== */

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

.section {
  padding: var(--section-padding-mobile) 0;
}

.section-bg {
  background-color: var(--color-bg-light);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.header {
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.logo span {
  color: var(--color-secondary);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--color-primary);
  margin: 5px 0;
  transition: var(--transition-base);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: -100%;
  width: 80%;
  max-width: 300px;
  height: 100vh;
  background-color: var(--color-white);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2xl) var(--spacing-lg);
  transition: left 0.3s ease;
  z-index: 999;
}

.nav.active {
  left: 0;
}

.nav-list {
  list-style: none;
}

.nav-item {
  margin-bottom: var(--spacing-md);
}

.nav-link {
  display: block;
  padding: var(--spacing-sm);
  color: var(--color-primary);
  font-weight: 600;
  transition: var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-secondary);
  padding-left: var(--spacing-md);
}

.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 998;
}

.nav-overlay.active {
  display: block;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-family: var(--font-heading);
  font-weight: 600;
  text-align: center;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #1e40af;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-accent:hover {
  background-color: #d97706;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

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

.btn-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
  height: 100%;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card-icon {
  width: 60px;
  height: 60px;
  background-color: var(--color-secondary);
  color: var(--color-white);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 150px;
}

.form-required {
  color: #ef4444;
}

.form-error {
  color: #ef4444;
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  display: none;
}

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

.form-group.error .form-input,
.form-group.error .form-select,
.form-group.error .form-textarea {
  border-color: #ef4444;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-sm);
}

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

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.footer-contact-item i {
  margin-right: var(--spacing-sm);
  margin-top: 0.25rem;
  color: var(--color-accent);
}

.footer-legal-links {
  list-style: none;
}

.footer-legal-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-legal-links a {
  color: rgba(255, 255, 255, 0.8);
}

.footer-legal-links a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.hidden {
  display: none;
}

.visible-mobile {
  display: block;
}

.visible-desktop {
  display: none;
}

/* ==========================================================================
   Tablet & Up (768px+)
   ========================================================================== */

@media (min-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  h3 {
    font-size: 1.75rem;
  }
  
  .section {
    padding: var(--section-padding-tablet) 0;
  }
  
  .btn-group {
    flex-direction: row;
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   Desktop & Up (1024px+)
   ========================================================================== */

@media (min-width: 1024px) {
  h1 {
    font-size: 3rem;
  }
  
  h2 {
    font-size: 2.25rem;
  }
  
  .section {
    padding: var(--section-padding-desktop) 0;
  }
  
  .container {
    padding: 0 var(--spacing-lg);
  }
  
  /* Desktop Navigation */
  .menu-toggle {
    display: none;
  }
  
  .nav {
    position: static;
    width: auto;
    height: auto;
    max-width: none;
    background: none;
    box-shadow: none;
    padding: 0;
  }
  
  .nav-list {
    display: flex;
    gap: var(--spacing-lg);
  }
  
  .nav-item {
    margin-bottom: 0;
  }
  
  .nav-link {
    padding: var(--spacing-xs) 0;
  }
  
  .nav-link:hover,
  .nav-link.active {
    padding-left: 0;
  }
  
  .nav-overlay {
    display: none !important;
  }
  
  .footer-content {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .visible-mobile {
    display: none;
  }
  
  .visible-desktop {
    display: block;
  }
}