/* ===========================================
   DK Mobi Creation - Responsive Stylesheet
   =========================================== */

:root {
  /* Light Mode Colors */
  --color-primary: #00d4d4;
  --color-primary-dark: #00b0b0;
  --color-secondary: #ff6b5b;
  --color-bg: #fafbfc;
  --color-bg-secondary: #f0f1f3;
  --color-text: #1a1a1a;
  --color-text-secondary: #555555;
  --color-border: #e0e0e0;
  --color-accent: #ff6b5b;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-family-mono: "Courier New", monospace;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3.5rem;

  /* Transitions */
  --transition: all 0.3s ease;
  --transition-fast: all 0.15s ease;

  /* Shadows */
  --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);
}

/* Dark Mode */
[data-theme="dark"] {
  --color-bg: #0d1b2a;
  --color-bg-secondary: #1a2332;
  --color-text: #e8e8e8;
  --color-text-secondary: #b0b0b0;
  --color-border: #2a3a4a;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  transition: var(--transition);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-4xl);
}
h2 {
  font-size: var(--font-size-3xl);
}
h3 {
  font-size: var(--font-size-xl);
}
h4 {
  font-size: var(--font-size-lg);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

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

a:hover {
  color: var(--color-primary-dark);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ===========================================
   HEADER & NAVIGATION
   =========================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.navbar {
  padding: var(--spacing-md) 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  transition: var(--transition-fast);
}

.logo-link:hover {
  color: var(--color-primary);
}

.logo {
  width: 72px;
  height: 72px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.brand-name {
  display: inline-block;
  font-weight: 800;
  letter-spacing: 0.2px;
  font-size: 1rem;
  color: var(--color-text);
}

@media (max-width: 768px) {
  .logo {
    width: 52px;
    height: 52px;
  }
  .brand-name {
    display: none;
  }
}

/* Navigation Menu */
.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width 0.3s ease;
}

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

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(10px, 10px);
}

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

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

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: var(--transition-fast);
  color: var(--color-text);
}

.theme-toggle:hover {
  background-color: var(--color-bg-secondary);
}

.theme-toggle:active {
  animation: themeToggleSpin 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.sun-icon,
.moon-icon {
  width: 20px;
  height: 20px;
  transition: var(--transition);
}

.sun-icon {
  opacity: 1;
  transform: rotate(0deg);
}

.moon-icon {
  opacity: 0;
  transform: rotate(-180deg);
  position: absolute;
}

[data-theme="dark"] .sun-icon {
  opacity: 0;
  transform: rotate(180deg);
}

[data-theme="dark"] .moon-icon {
  opacity: 1;
  transform: rotate(0deg);
}

/* ===========================================
   HERO SECTION
   =========================================== */

.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
  min-height: 70vh;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.hero-headline {
  color: var(--color-text);
  line-height: 1.2;
}

.hero-subheadline {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.cta-button {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-primary);
  color: white;
  font-weight: 600;
  border-radius: 8px;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-md);
  text-align: center;
  width: fit-content;
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.cta-button:hover {
  background-color: var(--color-primary-dark);
  animation: buttonBounce 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 12px 24px rgba(0, 212, 212, 0.3);
}

.cta-button:active {
  animation: buttonPress 0.2s ease;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-icon {
  width: 100%;
  height: auto;
  max-width: 400px;
  color: var(--color-primary);
  opacity: 0.9;
}

/* ===========================================
   SECTIONS COMMON
   =========================================== */

section {
  padding: var(--spacing-2xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  text-align: center;
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
}

/* ===========================================
   SERVICES SECTION
   =========================================== */

.services {
  background-color: var(--color-bg-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.service-card {
  padding: var(--spacing-2xl);
  background-color: var(--color-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Variant: Emphasize long-lived, maintainable code foundations */
.service-card--foundation {
  background: linear-gradient(
    135deg,
    rgba(0, 212, 212, 0.04),
    rgba(255, 107, 91, 0.02)
  );
  border-left: 6px solid var(--color-primary);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.service-card--foundation .service-icon-wrapper {
  background: linear-gradient(
    180deg,
    rgba(0, 212, 212, 0.02),
    rgba(255, 107, 91, 0.01)
  );
}

.service-code-badge {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Roboto Mono",
    "Segoe UI Mono", monospace;
  background-color: rgba(13, 27, 42, 0.06);
  color: var(--color-text);
  padding: 4px 8px;
  border-radius: 8px;
  font-size: 0.875rem;
  margin-top: 6px;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.service-icon-wrapper {
  width: 100%;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  border-radius: 8px;
  padding: var(--spacing-md);
}

.service-icon {
  width: 100%;
  height: 100%;
  color: var(--color-primary);
  opacity: 0.9;
}

.service-card h3 {
  color: var(--color-text);
  font-size: var(--font-size-xl);
}

.service-card p {
  margin: 0;
  font-size: var(--font-size-sm);
  line-height: 1.8;
}

/* ===========================================
   PORTFOLIO SECTION
   =========================================== */

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.portfolio-card {
  background-color: var(--color-bg-secondary);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  cursor: pointer;
}

.portfolio-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.portfolio-image {
  width: 100%;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg);
  padding: var(--spacing-md);
  color: var(--color-primary);
}

.portfolio-image svg {
  width: 100%;
  height: 100%;
}

.portfolio-content {
  padding: var(--spacing-lg);
}

.portfolio-content h3 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

.portfolio-content p {
  font-size: var(--font-size-sm);
  margin: 0;
}

/* ===========================================
   PROCESS SECTION
   =========================================== */

.process {
  background-color: var(--color-bg);
}

.process-timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.process-step {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border-radius: 12px;
  border-left: 4px solid var(--color-primary);
  transition: var(--transition);
}

.process-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.process-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: white;
  border-radius: 50%;
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.process-step h3 {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin: 0;
}

.process-step p {
  font-size: var(--font-size-sm);
  margin: 0;
  color: var(--color-text-secondary);
}

/* ===========================================
   ABOUT SECTION
   =========================================== */

.about {
  background-color: var(--color-bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
  margin-top: var(--spacing-2xl);
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.about-text h3 {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.about-text p {
  margin-bottom: 0;
  line-height: 1.8;
}

.about-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.about-list li {
  padding-left: var(--spacing-lg);
  position: relative;
  color: var(--color-text-secondary);
}

.about-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-icon {
  width: 100%;
  height: auto;
  max-width: 300px;
  color: var(--color-primary);
  opacity: 0.9;
}

/* ===========================================
   CONTACT SECTION
   =========================================== */

.contact {
  background-color: var(--color-bg);
  padding: var(--spacing-2xl) 0;
}

.contact-form {
  max-width: 600px;
  margin: var(--spacing-2xl) auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Contact grid layout: details + form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: var(--spacing-2xl);
  align-items: start;
  margin-top: var(--spacing-lg);
}

.contact-details {
  padding: var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.contact-details h4 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-lg);
  color: var(--color-text);
}

.contact-details p {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .contact-form {
    margin: var(--spacing-md) 0 0 0;
  }
}

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

.form-group label {
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--font-size-sm);
}

.form-group input,
.form-group textarea {
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
  font-family: var(--font-family-base);
}

.submit-button {
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-primary);
  color: white;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.submit-button:hover {
  background-color: var(--color-primary-dark);
  animation: buttonBounce 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 12px 24px rgba(0, 212, 212, 0.3);
}

.submit-button:active {
  animation: buttonPress 0.2s ease;
}

/* ===========================================
   FOOTER
   =========================================== */

.footer {
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  text-align: center;
}

.footer-content > p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-contact-info {
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-sm);
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  justify-content: center;
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

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

.separator {
  color: var(--color-border);
}

.social-icons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: var(--transition-fast);
}

.social-link:hover {
  background-color: var(--color-primary);
  color: white;
}

.social-link svg {
  width: 16px;
  height: 16px;
}

/* ===========================================
   RESPONSIVE DESIGN
   =========================================== */

@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    min-height: 0;
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .social-icons {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2.5rem;
    --font-size-3xl: 2rem;
    --font-size-xl: 1.25rem;
    --spacing-2xl: 2.5rem;
    --spacing-xl: 1.5rem;
  }

  .brand-name {
    display: inline;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-link::after {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    padding: var(--spacing-xl) var(--spacing-md);
  }

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

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

  .process-timeline {
    grid-template-columns: 1fr;
  }

  .portfolio-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }

  .footer-content {
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
    --font-size-lg: 1rem;
    --spacing-2xl: 1.5rem;
    --spacing-xl: 1rem;
    --spacing-lg: 1rem;
  }

  .nav-container {
    padding: 0 var(--spacing-md);
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  section {
    padding: var(--spacing-xl) 0;
  }

  .hero {
    padding: var(--spacing-xl) var(--spacing-md);
    min-height: 0;
  }

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

  .hero-subheadline {
    font-size: var(--font-size-base);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .service-card,
  .portfolio-card {
    padding: var(--spacing-lg);
  }

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

  .form-group input,
  .form-group textarea {
    font-size: 16px; /* Prevents iOS zoom on input focus */
  }

  .footer-content {
    gap: var(--spacing-lg);
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* Print Styles */
@media print {
  .header,
  .footer {
    display: none;
  }

  body {
    background-color: white;
    color: black;
  }
}

/* ===========================================
   ANIMATIONS & KEYFRAMES
   =========================================== */

@keyframes buttonBounce {
  0% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-6px) scale(1.02);
  }
  100% {
    transform: translateY(0) scale(1);
  }
}

@keyframes buttonPress {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(0.95);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes themeToggleSpin {
  0% {
    transform: rotate(0deg) scale(1);
  }
  50% {
    transform: rotate(180deg) scale(1.1);
  }
  100% {
    transform: rotate(360deg) scale(1);
  }
}

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

@keyframes svgFlicker {
  0%,
  18%,
  22%,
  25%,
  54%,
  56%,
  100% {
    opacity: 1;
  }
  20%,
  24%,
  55% {
    opacity: 0.7;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}