/* ============================================
   SIDDHARTHA MAJUMDER - Personal Brand Website
   style.css - Main Styles & Variables
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg-primary: #0f1b2d;
  --bg-secondary: #162035;
  --bg-card: #1a2744;
  --bg-card-hover: #1e2d50;
  --accent: #c9a96e;
  --accent-hover: #dfc08a;
  --accent-glow: rgba(201, 169, 110, 0.15);
  --text-primary: #ffffff;
  --text-secondary: #b8c4d6;
  --text-muted: #6b7a8d;
  --border-subtle: rgba(201, 169, 110, 0.2);
  --border-accent: rgba(201, 169, 110, 0.4);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.4);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-arch: 50% 50% 0 0;
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition-fast: 0.25s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-base: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-slow: 0.8s cubic-bezier(0.22, 1, 0.36, 1);
  --max-width: 1200px;
  --section-padding: 120px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: clamp(1.1rem, 2vw, 1.35rem); }

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.section-label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
  display: block;
}

.section-number {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

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

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 20px 0;
  transition: background-color var(--transition-base), padding var(--transition-base), backdrop-filter var(--transition-base);
}

.navbar.scrolled {
  background-color: rgba(15, 27, 45, 0.95);
  backdrop-filter: blur(20px);
  padding: 12px 0;
  border-bottom: 1px solid var(--border-subtle);
}

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

.nav-logo {
  display: flex;
  align-items: center;
}

.nav-logo-img {
  height: 40px;
  width: auto;
  object-fit: contain;
}

.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-base), left var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
  left: 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-hamburger span {
  width: 28px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at center, transparent 0%, var(--bg-primary) 75%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  padding: 0 24px;
}

.hero-subtitle {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero h1 {
  margin-bottom: 24px;
  font-size: clamp(2.8rem, 6vw, 5rem);
  letter-spacing: 2px;
}

.hero-typewriter {
  display: inline;
  border-right: 3px solid var(--accent);
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 40px;
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition-base);
  border-radius: var(--radius-sm);
}

.hero-cta:hover {
  background: var(--accent);
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(201, 169, 110, 0.25);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.hero-scroll-indicator .scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* --- Section Base --- */
.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: var(--accent);
  margin: 24px auto 0;
  border-radius: 2px;
}

/* --- About Section --- */
.about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: center;
}

.about-image-wrapper {
  position: relative;
}

.about-image {
  width: 100%;
  max-width: 380px;
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-arch);
  overflow: hidden;
  border: 3px solid var(--border-accent);
  margin: 0 auto;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.about-image .placeholder-icon {
  font-size: 4rem;
  color: var(--text-muted);
}

.about-image-wrapper::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 40px);
  max-width: 360px;
  height: 100%;
  border-radius: var(--radius-arch);
  border: 1px solid var(--border-subtle);
  z-index: -1;
}

.about-text h2 {
  margin-bottom: 20px;
}

.about-text p {
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

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

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  color: var(--accent);
  font-weight: 700;
  line-height: 1;
}

.stat-number span {
  font-size: 1.5rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 8px;
}

/* --- Competencies --- */
.competencies-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.competency-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
  flex: 0 1 calc(33.333% - 14px);
  min-width: 250px;
}

.competency-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.competency-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: 1.2rem;
}

.competency-card h4 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* --- Projects --- */
.projects-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
}

.project-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 32px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  flex: 0 1 calc(33.333% - 19px);
  min-width: 320px;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.project-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.project-card:hover::before {
  opacity: 1;
}

.project-year {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.project-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.project-client {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 12px;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.project-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-glow);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  margin-top: 16px;
  letter-spacing: 0.5px;
}

/* --- Industries --- */
.industries-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}

.industry-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
  flex: 0 1 calc(33.333% - 16px);
  min-width: 160px;
}

.industry-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.industry-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}

.industry-card h4 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
}

/* --- Clients Marquee --- */
.clients-section {
  padding: 80px 0;
  background: var(--bg-secondary);
  overflow: hidden;
}

.marquee-wrapper {
  overflow: hidden;
  position: relative;
}

.marquee-wrapper::before,
.marquee-wrapper::after {
  content: '';
  position: absolute;
  top: 0;
  width: 120px;
  height: 100%;
  z-index: 2;
}

.marquee-wrapper::before {
  left: 0;
  background: linear-gradient(to right, var(--bg-secondary), transparent);
}

.marquee-wrapper::after {
  right: 0;
  background: linear-gradient(to left, var(--bg-secondary), transparent);
}

.marquee-track {
  display: flex;
  gap: 80px;
  animation: marquee 30s linear infinite;
  width: max-content;
}

.marquee-item {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--text-muted);
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 2px;
  opacity: 0.5;
  transition: opacity var(--transition-base);
}

.marquee-item:hover {
  opacity: 1;
  color: var(--accent);
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* --- Services Page --- */
.services-hero {
  padding-top: 160px;
  padding-bottom: 80px;
  text-align: center;
}

.services-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
}

.service-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 40px 32px;
  transition: all var(--transition-base);
  position: relative;
  flex: 0 1 calc(33.333% - 19px);
  min-width: 300px;
}

.service-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.service-card-number {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 2px;
  margin-bottom: 20px;
  font-weight: 500;
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  color: var(--accent);
  font-size: 1.5rem;
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Scope Tabs */
.scope-section {
  background: var(--bg-secondary);
}

.scope-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 40px;
  flex-wrap: wrap;
  justify-content: center;
}

.scope-tab {
  padding: 12px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition-base);
  border-radius: var(--radius-sm);
}

.scope-tab:hover,
.scope-tab.active {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

.scope-content {
  display: none;
  max-width: 800px;
  margin: 0 auto;
}

.scope-content.active {
  display: block;
}

.scope-content h3 {
  margin-bottom: 16px;
  color: var(--accent);
}

.scope-content p {
  font-size: 1rem;
  line-height: 1.8;
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: 100px 0;
  position: relative;
}

.cta-section h2 {
  margin-bottom: 16px;
}

.cta-section p {
  max-width: 500px;
  margin: 0 auto 32px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 18px 48px;
  background: var(--accent);
  color: var(--bg-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(201, 169, 110, 0.3);
  color: var(--bg-primary);
}

/* --- Contact Page --- */
.contact-hero {
  padding-top: 160px;
  padding-bottom: 80px;
  text-align: center;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 64px;
}

.contact-info-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
}

.contact-info-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.contact-info-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 50%;
  margin: 0 auto 20px;
  color: var(--accent);
  font-size: 1.4rem;
}

.contact-info-card h4 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.contact-info-card p {
  font-size: 1rem;
  color: var(--text-primary);
}

.contact-info-card a {
  color: var(--text-primary);
}

.contact-info-card a:hover {
  color: var(--accent);
}

/* Contact Form */
.contact-form-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition-base);
  outline: none;
}

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

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

.form-submit {
  padding: 16px 40px;
  background: var(--accent);
  color: var(--bg-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  align-self: flex-start;
}

.form-submit:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201, 169, 110, 0.3);
}

.map-wrapper {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  height: 100%;
  min-height: 400px;
}

.map-wrapper iframe {
  width: 100%;
  height: 100%;
  min-height: 400px;
  border: none;
  filter: grayscale(0.8) brightness(0.7) contrast(1.1);
}

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  padding: 60px 0 30px;
  border-top: 1px solid var(--border-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-about h3 {
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.footer-about h3 span {
  color: var(--accent);
}

.footer-about p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-contact p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-image-wrapper {
    order: -1;
  }

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

@media (max-width: 768px) {
  :root {
    --section-padding: 64px;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    justify-content: center;
    gap: 32px;
    transition: right var(--transition-base);
    border-left: 1px solid var(--border-subtle);
  }

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

  .nav-hamburger {
    display: flex;
  }

  .project-card {
    flex: 0 1 100%;
  }

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

  .contact-form-wrapper {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .service-card {
    flex: 0 1 100%;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .industry-card {
    flex: 0 1 calc(50% - 12px);
  }

  .competency-card {
    flex: 0 1 100%;
  }
}