/* ==========================================================================
   ROHIT DATIR — PERSONAL PORTFOLIO DESIGN SYSTEM
   Theme: Minimal, Creative, Premium, Education & Local Brand Focused
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;0,800;1,600&display=swap');

:root {
  /* Color Palette */
  --bg-primary: #F8FAF9;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-alt: #F1F5F4;
  --bg-dark: #0F172A;
  
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --text-light: #F8FAFC;

  /* Accent Colors */
  --brand-blue: #2563EB;
  --brand-blue-hover: #1D4ED8;
  --brand-emerald: #0D9488;
  --brand-accent: #F59E0B;
  --brand-coral: #EF4444;
  
  --whatsapp-green: #25D366;
  --whatsapp-hover: #20BA5A;

  /* Border & Glass */
  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-focus: rgba(37, 99, 235, 0.4);
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.5);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.09);
  --shadow-xl: 0 24px 48px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.2);

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout Container */
  --container-max: 1240px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

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

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.2;
  font-weight: 700;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--brand-blue);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  border: 1px solid rgba(37, 99, 235, 0.15);
  transition: all var(--transition-fast);
}

.section-tag:hover {
  transform: translateY(-2px);
  background: rgba(37, 99, 235, 0.12);
}

.section-title {
  font-size: clamp(2rem, 3.8vw, 3rem);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: clamp(1rem, 1.2vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 680px;
  line-height: 1.6;
}

.section-header {
  margin-bottom: 50px;
}

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

.section-header.center .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section-padding {
  padding: 100px 0;
}

/* Navigation Bar */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all var(--transition-normal);
  padding: 20px 0;
}

.site-header.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 12px 0;
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-subtle);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-primary);
  transition: transform var(--transition-fast);
}

.brand-logo:hover {
  transform: scale(1.02);
}

.brand-badge {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--brand-blue) 0%, var(--brand-emerald) 100%);
  color: #FFFFFF;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
  transition: transform var(--transition-bounce);
}

.brand-logo:hover .brand-badge {
  transform: rotate(-6deg) scale(1.08);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--brand-blue);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2.5px;
  background: var(--brand-blue);
  transition: width var(--transition-normal);
  border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  cursor: pointer;
  z-index: 1001;
}

.mobile-toggle span {
  display: block;
  height: 2.5px;
  width: 100%;
  background: var(--text-primary);
  border-radius: 4px;
  transition: all var(--transition-normal);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  transition: all var(--transition-normal);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--brand-blue);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  background: var(--brand-blue-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.45);
}

.btn-whatsapp {
  background: var(--whatsapp-green);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(37, 211, 102, 0.35);
}

.btn-whatsapp:hover {
  background: var(--whatsapp-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(37, 211, 102, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-subtle);
}

.btn-outline:hover {
  border-color: var(--brand-blue);
  color: var(--brand-blue);
  background: rgba(37, 99, 235, 0.04);
  transform: translateY(-3px);
}

.btn-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
  transform: translateX(3px);
}

/* Footer Styling */
.site-footer {
  background: var(--bg-dark);
  color: var(--text-light);
  padding: 60px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
}

.footer-nav {
  display: flex;
  gap: 28px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav a {
  color: #94A3B8;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #64748B;
  flex-wrap: wrap;
  gap: 16px;
}

/* Media Queries for Header Nav */
@media (max-width: 991px) {
  .mobile-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: 100px 30px 40px;
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-normal);
  }

  .nav-links.open {
    right: 0;
  }

  .header-actions {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   GLOBAL CREATIVE ANIMATIONS & UI ENGAGEMENT UTILITIES
   -------------------------------------------------------------------------- */

/* Scroll Progress Bar */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3.5px;
  width: 0%;
  background: linear-gradient(90deg, var(--brand-blue) 0%, var(--brand-emerald) 50%, var(--brand-accent) 100%);
  z-index: 1100;
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.5);
  transition: width 0.1s linear;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 210px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px) scale(0.9);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  background: var(--brand-blue);
  color: #FFFFFF;
  border-color: var(--brand-blue);
  transform: translateY(-3px) scale(1.08);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
}

@media (max-width: 768px) {
  .back-to-top {
    right: 80px;
    bottom: 20px;
    width: 42px;
    height: 42px;
  }
}