/* ============================================================
   SILK LOGISTICS — CORPORATE LOGISTICS STYLE SYSTEM
   Royal Navy Blue | Amber Gold | Clean Industrial Slates
============================================================ */

/* -------------------------------------
   ROOT TOKENS & SYSTEM VARIABLES
------------------------------------- */
:root {
  --color-primary: #0a192f;        /* Royal Navy */
  --color-secondary: #172a45;      /* Slate Blue */
  --color-accent: #f1c40f;         /* Amber Gold */
  --color-accent-hover: #f39c12;   /* Darker Gold */
  --color-bg-light: #f8fafc;       /* Light Slate */
  --color-card-light: #ffffff;
  --color-text-dark: #0f172a;      /* Charcoal */
  --color-text-light: #64748b;     /* Muted Slate */
  --color-border: #e2e8f0;
  
  --font-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-heading: 'Outfit', sans-serif;
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --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-neon: 0 0 25px rgba(241, 196, 15, 0.2);
  
  --container-width: 1200px;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-light);
  color: var(--color-text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

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

ul {
  list-style: none;
}

/* Common Section Titles */
.section-heading {
  margin-bottom: 3.5rem;
}

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

.tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-accent-hover);
  margin-bottom: 0.6rem;
}

.section-heading h2 {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.25;
}

.section-heading p {
  font-size: 1.05rem;
  color: var(--color-text-light);
  margin-top: 0.75rem;
  max-width: 600px;
}

.section-heading.text-center p {
  margin-left: auto;
  margin-right: auto;
}

/* Common Button layouts */
.btn-primary {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-heading);
  font-weight: 700;
  background-color: var(--color-accent);
  color: var(--color-primary);
  border: none;
  padding: 0.85rem 1.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-heading);
  font-weight: 700;
  background-color: transparent;
  color: #ffffff;
  border: 2px solid #ffffff;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.btn-secondary:hover {
  background-color: #ffffff;
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* -------------------------------------
   HEADER NAVIGATION BAR
------------------------------------- */
#header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  z-index: 100;
  background-color: rgba(10, 25, 47, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding: 1.2rem 0;
  transition: padding var(--transition-fast);
}

#header.scrolled {
  padding: 0.8rem 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-accent {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: 2.2rem;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: #a8b2d1;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-accent);
}

.phone-btn {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.55rem 1.15rem;
  background-color: rgba(255, 255, 255, 0.05);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
}

.phone-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 22px;
  height: 16px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 101;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #ffffff;
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* -------------------------------------
   MOBILE NAVIGATION OVERLAY
------------------------------------- */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--color-primary);
  z-index: 99;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.mobile-menu.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.mobile-link {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: #a8b2d1;
}

.mobile-link:hover {
  color: var(--color-accent);
}

.mobile-phone-btn {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  padding: 0.75rem 1.75rem;
  background-color: var(--color-accent);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
}

/* Hamburger active transformation */
.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* -------------------------------------
   HERO BANNER SECTION
------------------------------------- */
.hero-section {
  min-height: 90vh;
  background-color: var(--color-primary);
  background-image: radial-gradient(circle at 80% 30%, rgba(23, 42, 69, 0.6) 0%, transparent 60%);
  position: relative;
  display: flex;
  align-items: center;
  padding-top: 6rem;
  overflow: hidden;
  color: #ffffff;
}

.hero-glow {
  position: absolute;
  top: 10%;
  left: 5%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(241, 196, 15, 0.08) 0%, transparent 70%);
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 650px;
}

.hero-tagline {
  display: inline-block;
  font-family: var(--font-mono, monospace);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero-desc {
  font-size: 1.15rem;
  color: #8892b0;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
}

/* -------------------------------------
   CARGO TRACKING PORTAL STYLING
------------------------------------- */
.tracking-section {
  padding: 4rem 0;
  margin-top: -5rem;
  position: relative;
  z-index: 10;
}

.tracking-box {
  background-color: #ffffff;
  border-radius: var(--radius-md);
  padding: 3rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.tracking-box .section-heading {
  margin-bottom: 2rem;
}

.tracking-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  max-width: 700px;
  margin: 0 auto;
}

.tracking-form input {
  padding: 1rem 1.5rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  transition: border-color var(--transition-fast);
}

.tracking-form input:focus {
  border-color: var(--color-primary);
}

.tracking-form .btn-submit {
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  padding: 0 2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.tracking-form .btn-submit:hover {
  background-color: var(--color-secondary);
}

/* Tracking Result Panel */
.tracking-result {
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-border);
  animation: slideFadeIn 0.4s ease-out;
}

.tracking-result.hidden {
  display: none;
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.result-header h4 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-primary);
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
}

.status-indicator.in-transit {
  background-color: rgba(241, 196, 15, 0.1);
  color: #d68910;
}

.status-indicator.delivered {
  background-color: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.result-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.detail-item {
  display: flex;
  flex-direction: column;
}

.detail-item .lbl {
  font-size: 0.8rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  font-weight: 700;
}

.detail-item .val {
  font-weight: 600;
  color: var(--color-text-dark);
  margin-top: 0.25rem;
}

/* -------------------------------------
   SERVICES SECTION STYLING
------------------------------------- */
.services-section {
  padding: 6rem 0;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.service-card {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.service-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
}

.icon-box {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.service-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

.service-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* -------------------------------------
   OPERATIONS NETWORK DIRECTORY (100 HUBS)
------------------------------------- */
.directory-section {
  padding: 6rem 0;
  background-color: var(--color-primary);
  color: #ffffff;
}

.directory-section .section-heading h2 {
  color: #ffffff;
}

.directory-section .section-heading p {
  color: #a8b2d1;
}

.directory-controls {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.directory-controls input {
  flex-grow: 1;
  padding: 0.9rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.15);
  background-color: rgba(255, 255, 255, 0.05);
  color: #ffffff;
  outline: none;
  font-family: var(--font-sans);
  font-size: 1rem;
}

.directory-controls input::placeholder {
  color: #8892b0;
}

.directory-controls input:focus {
  border-color: var(--color-accent);
  background-color: rgba(255, 255, 255, 0.08);
}

.directory-controls select {
  padding: 0 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.15);
  background-color: rgba(255, 255, 255, 0.05);
  color: #ffffff;
  outline: none;
  font-family: var(--font-heading);
  font-weight: 600;
  cursor: pointer;
}

.directory-controls select option {
  background-color: var(--color-primary);
  color: #ffffff;
}

.hubs-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
}

.hub-list-item {
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: transform var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.hub-list-item:hover {
  transform: scale(1.03);
  border-color: var(--color-accent);
  background-color: rgba(255, 255, 255, 0.08);
}

.hub-link {
  display: block;
  padding: 1.25rem;
  text-decoration: none;
}

.hub-id {
  font-family: var(--font-mono, monospace);
  font-size: 0.75rem;
  color: var(--color-accent);
  font-weight: 700;
}

.hub-city {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0.35rem 0 0.5rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hub-status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #10b981;
}

/* -------------------------------------
   CONTACT & FREIGHT QUOTE SECTION
------------------------------------- */
.contact-section {
  padding: 6rem 0;
  background-color: #ffffff;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.contact-info {
  display: flex;
  flex-direction: column;
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  margin-top: 2rem;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.info-icon {
  width: 48px;
  height: 48px;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  border: 1px solid var(--color-border);
}

.info-details {
  display: flex;
  flex-direction: column;
}

.info-details .label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-light);
  letter-spacing: 0.5px;
}

.info-details .val {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 0.15rem;
}

.info-details .val-link:hover {
  color: var(--color-accent-hover);
}

.contact-form-box {
  background-color: var(--color-bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 3rem;
  box-shadow: var(--shadow-md);
}

.contact-form-box h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 1.75rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 0.85rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  background-color: #ffffff;
  transition: border-color var(--transition-fast);
}

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

.contact-form-box .btn-submit {
  width: 100%;
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  padding: 0.9rem 0;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.contact-form-box .btn-submit:hover {
  background-color: var(--color-secondary);
}

.quote-result {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  animation: slideFadeIn 0.3s ease-out;
}

.quote-result.success {
  background-color: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.quote-result.hidden {
  display: none;
}

/* -------------------------------------
   FOOTER STYLING
------------------------------------- */
footer {
  background-color: #050d18;
  color: #8892b0;
  padding: 2.5rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.footer-links span {
  font-weight: 600;
}

/* -------------------------------------
   KEYFRAMES ANIMATIONS
------------------------------------- */
@keyframes slideFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* -------------------------------------
   RESPONSIVE MEDIA QUERIES
------------------------------------- */
@media (max-width: 1024px) {
  html {
    font-size: 15px;
  }
  .hubs-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  #header {
    padding: 1rem 0;
  }
  .nav-menu {
    display: none;
  }
  .header-contact {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .hero-title {
    font-size: 2.6rem;
  }
  .hubs-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .tracking-form {
    grid-template-columns: 1fr;
  }
  .tracking-form .btn-submit {
    padding: 1rem 0;
  }
}

@media (max-width: 580px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .hubs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .result-details {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .footer-grid {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

@media (max-width: 400px) {
  .hubs-grid {
    grid-template-columns: 1fr;
  }
}