/* ==========================================
   CSS Variables & Root Styles
   ========================================== */

:root {
  --color-primary:#0d6346;
  --color-primary-dark: #1a7253;
  --color-black: #0A0A0A;
  --color-white: #FFFFFF;
  --color-grey-50: #F9FAFB;
  --color-grey-100: #F3F4F6;
  --color-grey-200: #E5E7EB;
  --color-grey-300: #D1D5DB;
  --color-grey-600: #4B5563;
  --color-grey-700: #374151;
  --color-grey-800: #1F2937;
  
  --color-bg: var(--color-white);
  --color-bg-secondary: var(--color-grey-50);
  --color-text-primary: var(--color-black);
  --color-text-secondary: var(--color-grey-700);
  --color-text-muted: var(--color-grey-600);
  --color-border: var(--color-grey-200);
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  --spacing-4xl: 8rem;
  
  --max-width: 1200px;
  --nav-height: 80px;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  
  --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);
}

/* ==========================================
   Base Styles
   ========================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

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

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

ul {
  list-style: none;
}

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

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

/* ==========================================
   Navigation
   ========================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.nav__logo:hover {
  transform: scale(1.05);
}

.logo-infinity {
  display: block;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav__link {
  font-size: 0.9375rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

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

.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.theme-toggle:hover {
  background-color: var(--color-grey-100);
  color: var(--color-primary);
}

.theme-toggle__icon .moon {
  display: none;
}

/* ==========================================
   Hero Section (Home Page)
   ========================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-grey-50) 100%);
}

.hero__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
  width: 100%;
}

.hero__content-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero__text {
  max-width: 600px;
}

.hero__logo {
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.infinity-path {
  stroke-dasharray: 400;
  stroke-dashoffset: 400;
  animation: draw 2s ease-out forwards;
}

@keyframes draw {
  to { stroke-dashoffset: 0; }
}

.hero__title {
  font-size: 3.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.hero__subtitle {
  font-size: 1.25rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.hero__description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

.hero__actions {
  display: flex;
  gap: var(--spacing-md);
}

.hero__image-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__image-frame {
  position: relative;
  z-index: 2;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 4px solid var(--color-white);
  background-color: var(--color-grey-200);
  aspect-ratio: 3/4;
  width: 100%;
  max-width: 400px;
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__image-bg {
  position: absolute;
  top: 20px;
  right: -20px;
  width: 100%;
  max-width: 400px;
  aspect-ratio: 3/4;
  background: linear-gradient(135deg, var(--color-primary) 0%, #0d6346 100%);
  border-radius: var(--radius-xl);
  z-index: 1;
}

/* ==========================================
   Buttons
   ========================================== */

.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-white);
}

.btn--secondary {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background-color: transparent;
}

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

/* ==========================================
   Page Layout (Inner Pages)
   ========================================== */

.page {
  min-height: 100vh;
  padding-top: var(--nav-height);
  padding-bottom: var(--spacing-4xl);
}

.page__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.page__title {
  font-size: 3rem;
  margin-bottom: var(--spacing-xl);
  text-align: center;
  color: #0d6346;
}

/* ==========================================
   About Page
   ========================================== */

.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-3xl);
  margin-top: var(--spacing-xl);
}

.content-block {
  margin-bottom: var(--spacing-xl);
}

.content-block__title {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.content-block p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.mission-box {
  padding: var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
}

.mission-box__label {
  font-size: 0.875rem;
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.mission-box__text {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-text-primary);
  margin-bottom: 0;
}

.profile-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  position: sticky;
  top: calc(var(--nav-height) + var(--spacing-lg));
}

.profile-card__image-container {
  width: 100%;
  aspect-ratio: 1/1;
  background-color: var(--color-grey-100);
  overflow: hidden;
}

.profile-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-card__info {
  padding: var(--spacing-lg);
  text-align: center;
}

.profile-card__name {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.profile-card__role {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-xs);
}

.profile-card__focus {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* ==========================================
   Skills Page
   ========================================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.skill-card {
  padding: var(--spacing-xl);
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.skill-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.skill-card__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, #0d6346 100%);
  border-radius: var(--radius-md);
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.skill-card__title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.skill-card__description {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ==========================================
   Projects Page
   ========================================== */

.featured-project {
  background: linear-gradient(135deg, var(--color-grey-50) 0%, var(--color-white) 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-3xl);
  border: 2px solid var(--color-border);
}

.featured-project__badge {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  font-size: 0.875rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-md);
}

.featured-project__title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.featured-project__tagline {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.featured-project__section {
  margin-bottom: var(--spacing-lg);
}

.featured-project__section h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.featured-project__section p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.featured-project__section ul {
  list-style: disc;
  padding-left: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.featured-project__section li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.7;
}

.featured-project__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
}

.tech-badge {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
  background-color: #0d6346;
  border-radius: var(--radius-sm);
  border: 1px solid #0d6346;
}

.featured-project__link {
  display: inline-block;
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  transition: color var(--transition-base);
}

.featured-project__link:hover {
  color: var(--color-primary-dark);
}

.projects-list {
  display: grid;
  gap: var(--spacing-xl);
}

.project-item {
  padding: var(--spacing-xl);
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.project-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.project-item__title {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
}

.project-item__description {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.project-item__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.project-item__link {
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  transition: color var(--transition-base);
}

.project-item__link:hover {
  color: var(--color-primary-dark);
}


/* ==========================================
   Contact Page
   ========================================== */

.contact-content {
  max-width: 800px;
  margin: 0 auto;
}

.contact-intro {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.contact-intro__text {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 600px;
  margin: 0 auto;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.contact-card {
  padding: var(--spacing-xl);
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
}

.contact-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.contact-card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, #0d6346 100%);
  border-radius: var(--radius-md);
  color: var(--color-white);
}

.contact-card__title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

.contact-card__detail {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.contact-card__action {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
}

.contact-footer {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.contact-footer p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

/* ==========================================
   Footer
   ========================================== */

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

.footer__container {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer__logo {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.footer__text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 968px) {
  .hero__content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .hero__image-container {
    order: -1;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  html { font-size: 14px; }
  
  .nav__links { gap: var(--spacing-md); }
  .nav__link { font-size: 0.875rem; }
  
  .hero__title { font-size: 2.5rem; }
  .hero__actions { flex-direction: column; width: 100%; }
  .btn { width: 100%; text-align: center; }
  
  .page__title { font-size: 2.25rem; }
  
  .skills-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  
  .timeline::before { left: 6px; }
  .timeline-item { padding-left: var(--spacing-xl); }
  .timeline-item__marker { left: 0; }
}

@media (max-width: 480px) {
  .nav__container { padding: 0 var(--spacing-md); }
  .nav__links { gap: var(--spacing-sm); }
  .page__container { padding: var(--spacing-2xl) var(--spacing-md); }
}