/* style.css – fully responsive, mobile-first, modern minimal palette */
:root {
  /* light theme (default) – clean, professional, soft */
  --bg-primary: #faf9f6;
  --bg-secondary: #ffffff;
  --text-primary: #1e1e2f;
  --text-secondary: #4a4a5a;
  --accent: #3b4b8f;        /* subtle indigo */
  --accent-light: #e2e8f0;
  --card-bg: #ffffff;
  --shadow: 0 10px 25px -5px rgba(0 0 0 / 0.05), 0 8px 10px -6px rgba(0 0 0 / 0.02);
  --border-light: #e9e9ed;
  --btn-text: #ffffff;
  --footer-text: #6f6f7e;
  --period: #3b4b8f;
  --icon-opacity: 0.8;
  --nav-hover: #2a3a6f;
}

/* dark theme – smooth, low contrast, readable */
body.dark {
  --bg-primary: #171c28;
  --bg-secondary: #1e2638;
  --text-primary: #e3e9f1;
  --text-secondary: #b0c0d0;
  --accent: #7f9fcf;
  --accent-light: #2a3349;
  --card-bg: #1f2a3f;
  --shadow: 0 15px 30px -10px rgba(0 0 0 / 0.6);
  --border-light: #2f3b4e;
  --btn-text: #171c28;
  --footer-text: #9aaec9;
  --period: #7f9fcf;
  --icon-opacity: 0.9;
  --nav-hover: #b6c9f0;
}

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

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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* container – mobile first */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 0.5rem;
}

/* header */
.site-header {
  background-color: var(--bg-secondary);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(4px);
  background-color: color-mix(in srgb, var(--bg-secondary) 85%, transparent);
  border-bottom: 1px solid var(--border-light);
}

.header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 70px;
  padding: 0.5rem 0;
}

.logo {
  font-weight: 600;
  font-size: 1.8rem;
  letter-spacing: -0.5px;
  text-decoration: none;
  color: var(--text-primary);
  border: 2px solid var(--accent);
  padding: 0.15rem 0.7rem;
  border-radius: 40px 40px 40px 4px;
  transition: 0.2s;
}

.logo:hover {
  background-color: var(--accent);
  color: var(--btn-text);
}

/* navigation */
.nav-list {
  display: flex;
  gap: 1.2rem;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-list a {
  text-decoration: none;
  color: var(--text-secondary);
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: 0.2s;
}

.nav-list a:hover,
.nav-list a:focus {
  color: var(--nav-hover);
  border-bottom-color: var(--accent);
}

/* theme toggle button */
.theme-toggle {
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 0.2rem;
  opacity: var(--icon-opacity);
  display: flex;
  gap: 0.2rem;
  border-radius: 40px;
  background-color: var(--accent-light);
  padding: 0.2rem 0.4rem;
  transition: 0.2s;
}

.theme-toggle span {
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

/* hide current theme icon (handled by js) */
body:not(.dark) .dark-icon,
body.dark .light-icon {
  display: none;
}

/* sections */
.section {
  padding: 4.5rem 0;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
  border-left: 6px solid var(--accent);
  padding-left: 1rem;
  color: var(--text-primary);
}

/* hero - now with flex layout for text + hacker image */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 90% 30%, var(--accent-light) 0%, transparent 50%);
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  flex-wrap: wrap;
}

.hero-text-block {
  flex: 1 1 350px;
}

.hero-text-block h1 {
  font-size: 4rem;
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  letter-spacing: -2px;
  color: var(--text-primary);
}

.period {
  color: var(--period);
}

.hero-subhead {
  font-size: 1.4rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  font-weight: 350;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2.2rem;
}

/* hacker image styling - INCREASED SIZE */
.hero-image {
  flex: 0 0 380px;
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 30% 70% 40% 60% / 40% 40% 60% 60%;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 3px solid var(--accent-light);
  background: var(--card-bg);
  transition: transform 0.3s ease;
}

.hero-image:hover {
  transform: scale(1.02) rotate(1deg);
}

.hacker-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
}

/* about card */
.about-card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 28px;
  box-shadow: var(--shadow);
  max-width: 780px;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  font-size: 1.15rem;
}

.about-secondary {
  margin-top: 1rem;
  font-style: italic;
  color: var(--text-secondary);
  opacity: 0.8;
}

/* skills grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 1rem;
  list-style: none;
}

.skill-item {
  background: var(--card-bg);
  padding: 0.9rem 0.5rem;
  text-align: center;
  border-radius: 40px;
  font-weight: 500;
  color: var(--text-primary);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: all 0.2s;
}

.skill-item:hover {
  transform: translateY(-4px);
  background-color: var(--accent);
  color: var(--btn-text);
  border-color: var(--accent);
}

/* projects grid */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 680px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 992px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-card {
  background: var(--card-bg);
  border-radius: 28px;
  padding: 1.8rem 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: transform 0.25s ease, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 35px -12px rgba(0, 20, 40, 0.25);
}

.project-title {
  font-size: 1.6rem;
  font-weight: 550;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.project-desc {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.project-tech {
  font-size: 0.9rem;
  color: var(--accent);
  background-color: var(--accent-light);
  padding: 0.4rem 1rem;
  border-radius: 40px;
  display: inline-block;
  margin: 1rem 0 1.5rem;
  border: 1px solid var(--border-light);
  font-weight: 500;
  align-self: flex-start;
}

.project-link {
  text-decoration: none;
  font-weight: 600;
  color: var(--accent);
  border-bottom: 1.5px solid transparent;
  transition: 0.2s;
  margin-top: auto;
  width: fit-content;
}

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

/* contact form */
.contact-wrapper {
  background: var(--card-bg);
  border-radius: 32px;
  padding: 2rem;
  box-shadow: var(--shadow);
  max-width: 620px;
  border: 1px solid var(--border-light);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.3px;
}

.form-group input,
.form-group textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.9rem 1.2rem;
  border-radius: 40px;
  border: 1.5px solid var(--border-light);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: 0.2s;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(123, 159, 207, 0.2);
}

.btn {
  display: inline-block;
  background-color: var(--accent);
  color: var(--btn-text);
  border: none;
  padding: 0.9rem 2rem;
  border-radius: 60px;
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  transition: 0.2s;
  box-shadow: var(--shadow);
  text-decoration: none;
  border: 1px solid transparent;
  align-self: flex-start;
}

.btn-primary:hover {
  background-color: var(--nav-hover);
  transform: scale(1.02);
  color: var(--bg-primary);
}

.form-feedback {
  margin-top: 0.3rem;
  font-size: 0.9rem;
  min-height: 1.5rem;
  color: var(--accent);
}

/* footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  padding: 2rem 0;
  text-align: center;
  color: var(--footer-text);
  font-size: 0.9rem;
}

/* fade-in on scroll animation (intersection observer) */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* mobile navigation adjustments */
@media (max-width: 600px) {
  .header-flex {
    flex-wrap: wrap;
    gap: 0.5rem 0;
  }
  .nav-list {
    gap: 0.8rem;
    font-size: 0.85rem;
    order: 3;
    width: 100%;
    justify-content: center;
    padding-top: 0.3rem;
  }
  .hero-text-block h1 {
    font-size: 3rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .theme-toggle {
    order: 2;
  }
  .logo {
    order: 1;
  }
  /* stack hero on mobile */
  .hero-content {
    flex-direction: column;
    text-align: center;
    gap: 2rem;
  }
  .hero-image {
    flex-basis: 280px;
    width: 280px;
    height: 280px;
    margin-top: 1rem;
  }
  .hero-text-block .btn {
    margin: 0 auto;
  }
}

/* tablet adjustments */
@media (min-width: 601px) and (max-width: 900px) {
  .hero-image {
    flex-basis: 320px;
    height: 320px;
  }
}