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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #ec4899;
  --accent: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;
  --dark: #1e293b;
  --light: #f8fafc;
  --gray: #64748b;
  --white: #ffffff;
  --hero-bg: url("https://images.unsplash.com/photo-1521737604893-d14cc237f11d?auto=format&fit=crop&w=1600&q=80");
  --how-bg: url("https://images.unsplash.com/photo-1522075469751-3a6694fb2f61?auto=format&fit=crop&w=1600&q=80");
  --cta-bg: url("https://images.unsplash.com/photo-1498050108023-c5249f4df085?auto=format&fit=crop&w=1600&q=80");
  --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --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);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background: var(--light);
  overflow-x: hidden;
}

/* ===================================
   HEADER & NAVIGATION
   =================================== */
header {
  background: var(--white);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

nav a {
  color: var(--dark);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
  position: relative;
}

nav a:hover {
  color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

nav a:hover::after {
  width: 80%;
}

/* ===================================
   LANDING PAGE - HERO SECTION
   =================================== */
.hero {
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
    var(--hero-bg);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: var(--white);
  padding: 6rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
      circle at 20% 50%,
      rgba(255, 255, 255, 0.12) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(255, 255, 255, 0.12) 0%,
      transparent 50%
    );
  pointer-events: none;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  animation: fadeInUp 0.8s ease;
}

.hero .subtitle {
  font-size: 1.5rem;
  margin-bottom: 2.5rem;
  opacity: 0.95;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero .cta-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.4s both;
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1.1rem;
  text-decoration: none;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-md);
}

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

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

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: var(--white);
  border: 2px solid var(--white);
}

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

.btn-gradient {
  background: var(--gradient-2);
  color: var(--white);
}

.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  filter: brightness(1.1);
}

/* ===================================
   FEATURES SECTION
   =================================== */
.features {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--dark);
}

.section-subtitle {
  text-align: center;
  font-size: 1.2rem;
  color: var(--gray);
  margin-bottom: 4rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
}

.feature-card {
  background: var(--white);
  padding: 2.5rem;
  border-radius: 1.5rem;
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: var(--gradient-1);
  transition: height 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
  height: 100%;
  opacity: 0.05;
}

.feature-icon {
  width: 70px;
  height: 70px;
  background: var(--gradient-1);
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--white);
}

.feature-card:nth-child(2) .feature-icon {
  background: var(--gradient-2);
}

.feature-card:nth-child(3) .feature-icon {
  background: var(--gradient-3);
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--dark);
}

.feature-card p {
  color: var(--gray);
  line-height: 1.7;
}

/* ===================================
   HOW IT WORKS SECTION
   =================================== */
.how-it-works {
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0.75)),
    var(--how-bg);
  background-size: cover;
  background-position: center;
  padding: 5rem 2rem;
  color: var(--white);
}

.how-it-works .section-title,
.how-it-works .section-subtitle {
  color: var(--white);
}

.steps {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  gap: 3rem;
}

.step {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.1);
  padding: 2rem;
  border-radius: 1.5rem;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.step:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateX(10px);
}

.step-number {
  width: 60px;
  height: 60px;
  background: var(--white);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.step-content p {
  opacity: 0.95;
  line-height: 1.7;
}

/* ===================================
   CTA SECTION
   =================================== */
.cta-section {
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
    var(--cta-bg);
  background-size: cover;
  background-position: center;
  padding: 5rem 2rem;
  text-align: center;
  color: var(--white);
}

.cta-section h2 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.cta-section p {
  font-size: 1.2rem;
  margin-bottom: 2.5rem;
  opacity: 0.95;
}

/* ===================================
   FOOTER
   =================================== */
footer {
  background: var(--dark);
  color: var(--white);
  padding: 3rem 2rem;
  text-align: center;
}

footer p {
  opacity: 0.8;
}

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

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* ===================================
   DASHBOARD & FORMS
   =================================== */
.dashboard-container,
.login-container,
.register-container,
.home-container {
  max-width: 500px;
  margin: 3rem auto;
  padding: 2.5rem;
  background: var(--white);
  border-radius: 1.5rem;
  box-shadow: var(--shadow-xl);
}

.dashboard-container {
  max-width: 1200px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

input,
select,
textarea {
  width: 100%;
  padding: 1rem;
  border: 2px solid #e2e8f0;
  border-radius: 0.75rem;
  font-size: 1rem;
  transition: all 0.3s ease;
  font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

button[type="submit"],
.btn-submit {
  background: var(--gradient-1);
  color: var(--white);
  padding: 1rem 2rem;
  border: none;
  border-radius: 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

button[type="submit"]:hover,
.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  filter: brightness(1.1);
}

/* ===================================
   ERROR & SUCCESS MESSAGES
   =================================== */
.error-messages,
.success-message {
  padding: 1rem 1.5rem;
  border-radius: 0.75rem;
  margin-bottom: 1.5rem;
}

.error-messages {
  background: #fee2e2;
  color: #991b1b;
  border-left: 4px solid #ef4444;
}

.success-message {
  background: #d1fae5;
  color: #065f46;
  border-left: 4px solid var(--success);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .hero .subtitle {
    font-size: 1.2rem;
  }

  .hero .cta-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

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

  .features-grid {
    grid-template-columns: 1fr;
  }

  .step {
    flex-direction: column;
    text-align: center;
  }

  nav {
    flex-direction: column;
    text-align: center;
  }

  .dashboard-container,
  .login-container,
  .register-container {
    margin: 1rem;
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 4rem 1rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .features,
  .how-it-works,
  .cta-section {
    padding: 3rem 1rem;
  }
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.text-center {
  text-align: center;
}
.mt-1 {
  margin-top: 0.5rem;
}
.mt-2 {
  margin-top: 1rem;
}
.mt-3 {
  margin-top: 1.5rem;
}
.mb-1 {
  margin-bottom: 0.5rem;
}
.mb-2 {
  margin-bottom: 1rem;
}
.mb-3 {
  margin-bottom: 1.5rem;
}