/* ========================================
   DEV RAD KO - "Craftsman Terminal" Design
   Modern, Unique, Professional
   ======================================== */

/* Google Fonts - JetBrains Mono for headings, Inter for body */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@500;700&display=swap');

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
  /* Colors - Emerald accent palette */
  --color-bg-primary: #0a0a0c;
  --color-bg-secondary: #111114;
  --color-bg-tertiary: #1a1a1f;
  --color-bg-elevated: rgba(26, 26, 31, 0.7);
  --color-bg-glass: rgba(16, 185, 129, 0.03);

  --color-text-primary: #f4f4f5;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #52525b;

  --color-accent: #10b981;
  --color-accent-dim: rgba(16, 185, 129, 0.15);
  --color-accent-glow: rgba(16, 185, 129, 0.4);

  --color-border: rgba(244, 244, 245, 0.06);
  --color-border-accent: rgba(16, 185, 129, 0.3);

  /* Typography */
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-sans: 'Inter', system-ui, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.5rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-max: 1100px;
  --container-padding: 1.5rem;

  /* Effects */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --shadow-glow: 0 0 40px var(--color-accent-glow);
  --transition: 200ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);

  /* Subtle noise texture */
  background-image:
    url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-blend-mode: overlay;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

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

.section {
  padding: var(--space-20) 0;
  position: relative;
}

.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.section-label::before {
  content: '//';
  opacity: 0.5;
}

.section-title {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  line-height: 1.2;
}

.section-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-12);
}

/* ========================================
   Header
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 12, 0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  height: 32px;
  width: auto;
  position: relative;
  z-index: 101;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 101;
}

.menu-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.menu-toggle.menu-open .menu-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.menu-open .menu-bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle.menu-open .menu-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 12, 0.98);
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 99;
}

.nav.nav-open {
  opacity: 1;
  visibility: visible;
}

.nav-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

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

.header-cta {
  display: none;
}

/* Desktop Navigation */
@media (min-width: 768px) {
  .header .container {
    height: 72px;
  }

  .logo {
    height: 36px;
  }

  .menu-toggle {
    display: none;
  }

  .nav {
    position: static;
    background: transparent;
    backdrop-filter: none;
    opacity: 1;
    visibility: visible;
    display: block;
  }

  .nav-list {
    flex-direction: row;
    gap: var(--space-8);
  }

  .nav-link {
    font-size: var(--text-sm);
  }

  .header-cta {
    display: block;
  }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

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

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-accent);
  background: var(--color-accent-dim);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  /* Dynamic viewport height for mobile */
  display: flex;
  align-items: center;
  padding-top: 64px;
  /* Match mobile header height */
  padding-bottom: var(--space-12);
  position: relative;
  overflow: hidden;
}

/* Gradient orb decoration */
.hero::before {
  content: '';
  position: absolute;
  top: 10%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  opacity: 0.3;
  pointer-events: none;
}

/* Grid lines decoration */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(16, 185, 129, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 185, 129, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 750px;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.hero-greeting::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.hero-name {
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.1;
  margin-bottom: var(--space-2);
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.hero-tagline .highlight {
  color: var(--color-accent);
}

.hero-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-8);
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .hero-name {
    font-size: var(--text-5xl);
  }

  .hero-tagline {
    font-size: var(--text-3xl);
  }
}

/* Hero Grid Layout with Logo */
.hero-grid {
  display: grid;
  gap: var(--space-12);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-visual {
  display: none;
  justify-content: center;
  align-items: center;
}

.hero-logo-img {
  width: 100%;
  max-width: 280px;
  height: auto;
  filter: drop-shadow(0 0 40px var(--color-accent-glow));
  opacity: 0.9;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.3fr 1fr;
    gap: var(--space-16);
  }

  .hero-visual {
    display: flex;
  }

  .hero-logo-img {
    max-width: 320px;
  }
}

/* ========================================
   About Section
   ======================================== */
.about {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.about-grid {
  display: grid;
  gap: var(--space-12);
}

.about-text p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-5);
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* Tech stack badges */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.tech-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  backdrop-filter: blur(8px);
}

.tech-badge .years {
  color: var(--color-accent);
  font-weight: 700;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1.2fr 1fr;
    align-items: start;
  }
}

/* ========================================
   Services Section
   ======================================== */
.services-grid {
  display: grid;
  gap: var(--space-6);
}

.service-card {
  position: relative;
  padding: var(--space-8);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  transition: all var(--transition);
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

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

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

.service-number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  opacity: 0.6;
  margin-bottom: var(--space-4);
}

.service-title {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.service-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========================================
   Clients Section
   ======================================== */
.clients {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.clients-grid {
  display: grid;
  gap: var(--space-4);
}

.client-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
}

.client-check {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-dim);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
}

.client-check svg {
  width: 12px;
  height: 12px;
}

.client-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.client-text strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

@media (min-width: 640px) {
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========================================
   Process Section
   ======================================== */
.process-timeline {
  display: grid;
  gap: var(--space-6);
  position: relative;
}

.process-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-5);
  align-items: start;
}

.step-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.step-number {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-bg-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  border-radius: var(--radius-md);
}

.step-line {
  width: 2px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
}

.process-step:last-child .step-line {
  display: none;
}

.step-content {
  padding-bottom: var(--space-6);
}

.step-title {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.step-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

@media (min-width: 768px) {
  .process-timeline {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }

  .step-line {
    display: none;
  }

  .step-content {
    padding-bottom: 0;
  }
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.contact-grid {
  display: grid;
  gap: var(--space-12);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
}

.contact-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-dim);
  border-radius: var(--radius-md);
  color: var(--color-accent);
}

.contact-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.contact-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

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

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input,
.form-textarea {
  padding: var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1.5fr;
    align-items: start;
  }
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

.footer-text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ========================================
   Utilities
   ======================================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}