/* ====== VARIABLES ====== */
:root {
  --primary-blue: #0a192f;
  --accent: #3b82f6;
  --accent-dark: #2563eb;
  --white: #ffffff;
  --light-gray: #f3f4f6;
  --medium-gray: #e5e7eb;
  --dark-gray: #1f2937;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --success: #10b981;
  --warning: #f59e0b;
  --ai-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* ====== GLOBAL STYLES ====== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Poppins', sans-serif;
  background-color: var(--white);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 60px;
}

.section-header h2 {
  font-size: 36px;
  margin-bottom: 15px;
  color: var(--primary-blue);
}

.section-header p {
  font-size: 18px;
  color: var(--text-light);
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.cta-button {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: var(--white);
  padding: 15px 40px;
  font-size: 18px;
  border-radius: 30px;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.secondary-button {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  padding: 12px 30px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.secondary-button:hover {
  background: var(--accent);
  color: var(--white);
  transform: translateY(-2px);
}

/* ====== HEADER & LOGO ====== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  z-index: 1000;
  padding: 15px 0;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 15px;
}

/* E-shaped logo */
.logo-e {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 45px;
}

.bar {
  height: 4px;
  background-color: var(--primary-blue);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.bar-top {
  width: 45px;
}

.bar-middle {
  width: 30px;
  margin-left: 15px;
}

.bar-bottom {
  width: 45px;
}

.logo-text {
  font-family: 'Montserrat', sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-blue);
}

.desktop-nav {
  display: flex;
  gap: 30px;
}

.desktop-nav a {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  position: relative;
  transition: color 0.3s;
}

.desktop-nav a:after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}

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

.desktop-nav a:hover:after {
  width: 100%;
}

#sidebarToggle {
  background: none;
  border: none;
  color: var(--primary-blue);
  font-size: 24px;
  cursor: pointer;
  display: none;
}

/* ====== SIDEBAR ====== */
.sidebar {
  position: fixed;
  top: 0;
  right: -300px;
  width: 300px;
  height: 100vh;
  background-color: var(--white);
  box-shadow: -5px 0 15px rgba(0,0,0,0.1);
  transition: all 0.4s ease;
  z-index: 2000;
  display: flex;
  flex-direction: column;
}

.sidebar.open {
  right: 0;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid var(--medium-gray);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

#closeSidebar {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--primary-blue);
  cursor: pointer;
}

.nav-menu {
  list-style: none;
  padding: 20px;
  flex-grow: 1;
}

.nav-menu li {
  margin-bottom: 15px;
}

.nav-menu a {
  display: flex;
  align-items: center;
  padding: 12px 15px;
  color: var(--text-dark);
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.3s;
}

.nav-menu a:hover {
  background-color: #e0f2fe;
  color: var(--accent);
}

.nav-menu i {
  margin-right: 12px;
  font-size: 20px;
  width: 24px;
  text-align: center;
}

.sidebar-cta {
  padding: 20px;
  text-align: center;
  border-top: 1px solid var(--medium-gray);
}

/* ====== HERO SECTION ====== */
.hero {
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: linear-gradient(135deg, #f0f7ff 0%, #e6f0ff 100%);
}

.hero-content {
  flex: 1;
  padding-right: 50px;
}

.hero-content h1 {
  font-size: 48px;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--primary-blue);
}

.hero-content h1 span {
  color: var(--accent);
}

.hero-content p {
  font-size: 20px;
  color: var(--text-light);
  margin-bottom: 30px;
  max-width: 600px;
}

.hero-image {
  flex: 1;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0,0,0,0.1);
  transform: rotate(3deg);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ====== AI BUILDER SECTION ====== */
.ai-builder-section {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  padding: 80px 0;
}

.ai-builder-container {
  max-width: 1000px;
  margin: 0 auto;
}

.upload-section {
  text-align: center;
  margin-bottom: 40px;
}

.upload-area {
  border: 3px dashed var(--accent);
  border-radius: 20px;
  padding: 60px 40px;
  background: var(--white);
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
  cursor: pointer;
  margin: 40px 0;
}

.upload-area:hover {
  border-color: var(--accent-dark);
  transform: translateY(-5px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.upload-area.drag-over {
  border-color: var(--success);
  background: #f0fdf4;
}

.upload-icon {
  font-size: 4rem;
  color: var(--accent);
  margin-bottom: 20px;
}

.upload-area h3