/* Asif Foysal - Portfolio | Modern, clean design */

:root {
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --text-primary: #1a1d29;
  --text-secondary: #4a4d5c;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --border: #e5e7eb;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
  --hero-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  --section-bg: #ffffff;
}

[data-theme="dark"] {
  --bg-primary: #0f1117;
  --bg-secondary: #161922;
  --bg-card: #1c1f2a;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --accent-light: #1e3a5f;
  --border: #2d3344;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.4);
  --hero-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #a855f7 100%);
  --section-bg: #161922;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}
.container { max-width: 1140px; margin: 0 auto; padding: 0 1.5rem; }

.theme-toggle {
  position: fixed; top: 1.5rem; right: 1.5rem; z-index: 1000;
  width: 48px; height: 48px; border-radius: 50%;
  border: 2px solid var(--border); background: var(--bg-card);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow); transition: transform 0.2s, box-shadow 0.2s;
}
.theme-toggle:hover { transform: scale(1.05); box-shadow: var(--shadow-hover); }
.theme-icon { position: absolute; font-size: 1.25rem; transition: opacity 0.3s; }
.theme-icon.moon { opacity: 0; }
[data-theme="dark"] .theme-icon.sun { opacity: 0; }
[data-theme="dark"] .theme-icon.moon { opacity: 1; }

.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 999; padding: 1rem 0;
  background: rgba(248, 249, 252, 0.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent; transition: background 0.3s, border-color 0.3s;
}
[data-theme="dark"] .header {
  background: rgba(15, 17, 23, 0.85); border-bottom-color: var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-size: 1.5rem; font-weight: 700; color: var(--accent); text-decoration: none; letter-spacing: -0.02em; }
.nav-menu { display: flex; list-style: none; gap: 2rem; }
.nav-menu a { color: var(--text-secondary); text-decoration: none; font-weight: 500; transition: color 0.2s; }
.nav-menu a:hover { color: var(--accent); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: transform 0.3s, opacity 0.3s; }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.hero {
  min-height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center;
  position: relative; padding: 6rem 1.5rem 4rem;
}
.hero-bg { position: absolute; inset: 0; background: var(--hero-gradient); opacity: 0.08; pointer-events: none; }
.hero-inner {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.hero-content { text-align: left; }
.hero-greeting { font-size: 1rem; font-weight: 500; color: var(--accent); text-transform: uppercase; letter-spacing: 0.2em; margin-bottom: 0.5rem; }
.hero-name {
  font-size: clamp(2.5rem, 8vw, 4.5rem); font-weight: 700; letter-spacing: -0.03em; line-height: 1.1; margin-bottom: 1rem;
  background: var(--hero-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-tagline { font-size: clamp(1rem, 2.5vw, 1.25rem); color: var(--text-secondary); max-width: 560px; margin: 0 0 2rem; }
.hero-buttons { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: flex-start; }
.hero-image-wrap { flex-shrink: 0; position: relative; }
.hero-image {
  width: 280px; height: 280px;
  object-fit: cover;
  border-radius: 20px;
  border: 4px solid var(--border);
  box-shadow: var(--shadow-hover);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.hero-image:hover {
  transform: scale(1.02);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}
[data-theme="dark"] .hero-image { border-color: var(--border); }
[data-theme="dark"] .hero-image:hover { box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5); }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1.5rem; border-radius: 10px;
  font-weight: 600; font-size: 0.95rem; text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, color 0.2s; cursor: pointer; border: none; font-family: inherit;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg-card); color: var(--text-primary); border: 2px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.hero-scroll { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 0.5rem; color: var(--text-muted); font-size: 0.85rem; }
.scroll-arrow { width: 24px; height: 24px; border-right: 2px solid var(--text-muted); border-bottom: 2px solid var(--text-muted); transform: rotate(45deg); animation: bounce 2s infinite; }
@keyframes bounce { 0%, 100% { transform: rotate(45deg) translateY(0); } 50% { transform: rotate(45deg) translateY(6px); } }

.animate-in { opacity: 0; transform: translateY(20px); }
.animate-in.visible { opacity: 1; transform: translateY(0); }
.animate-in:nth-child(1) { transition: opacity 0.5s 0.1s, transform 0.5s 0.1s; }
.animate-in:nth-child(2) { transition: opacity 0.5s 0.2s, transform 0.5s 0.2s; }
.animate-in:nth-child(3) { transition: opacity 0.5s 0.3s, transform 0.5s 0.3s; }
.animate-in:nth-child(4) { transition: opacity 0.5s 0.4s, transform 0.5s 0.4s; }
.animate-in:nth-child(5) { transition: opacity 0.5s 0.5s, transform 0.5s 0.5s; }
.animate-in:nth-child(6) { transition: opacity 0.5s 0.6s, transform 0.5s 0.6s; }
.animate-in:nth-child(7) { transition: opacity 0.5s 0.7s, transform 0.5s 0.7s; }
.hero-image-wrap.animate-in { transition: opacity 0.5s 0.5s, transform 0.5s 0.5s; }

.section { padding: 5rem 0; background: var(--section-bg); transition: background 0.3s ease; }
.section:nth-child(even) { background: var(--bg-secondary); }
.section-title { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; text-align: center; margin-bottom: 3rem; letter-spacing: -0.02em; }
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

.about-content { max-width: 720px; margin: 0 auto; }
.about-text p { font-size: 1.125rem; color: var(--text-secondary); line-height: 1.8; }

.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.5rem; }
.skill-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 1.5rem;
  box-shadow: var(--shadow); transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}
.skill-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
.skill-card h3 { font-size: 1.1rem; font-weight: 600; color: var(--accent); margin-bottom: 1rem; font-family: 'JetBrains Mono', monospace; }
.skill-card ul { list-style: none; }
.skill-card li { padding: 0.35rem 0; color: var(--text-secondary); font-size: 0.95rem; border-bottom: 1px solid var(--border); }
.skill-card li:last-child { border-bottom: none; }
.skill-card-wide { grid-column: 1 / -1; }
.soft-skills { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; }
.skill-card-wide li { border: none; display: inline-block; padding: 0.5rem 1rem; background: var(--accent-light); color: var(--accent); border-radius: 8px; font-weight: 500; }
[data-theme="dark"] .skill-card-wide li { background: var(--accent-light); color: var(--accent); }

.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.project-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 2rem;
  box-shadow: var(--shadow); transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}
.project-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
.project-card h3 { font-size: 1.35rem; font-weight: 600; margin-bottom: 0.75rem; color: var(--text-primary); }
.project-desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 1rem; line-height: 1.6; }
.project-tech { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.25rem; }
.project-tech span { font-size: 0.8rem; padding: 0.35rem 0.75rem; background: var(--accent-light); color: var(--accent); border-radius: 6px; font-family: 'JetBrains Mono', monospace; }
[data-theme="dark"] .project-tech span { background: var(--accent-light); color: var(--accent); }
.project-links { display: flex; gap: 1rem; }
.project-links a { font-size: 0.9rem; font-weight: 600; color: var(--accent); text-decoration: none; transition: color 0.2s, transform 0.2s; }
.project-links a:hover { color: var(--accent-hover); transform: translateX(4px); }

.contact-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; max-width: 900px; margin: 0 auto; }
.contact-info { display: flex; flex-direction: column; gap: 1rem; }
.contact-item {
  display: flex; flex-direction: column; padding: 1rem 1.25rem; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; text-decoration: none; color: var(--text-primary); transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.contact-item:hover { border-color: var(--accent); transform: translateX(4px); box-shadow: var(--shadow); }
.contact-label { font-size: 0.8rem; font-weight: 600; color: var(--accent); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.25rem; }
.contact-form { display: flex; flex-direction: column; gap: 1.25rem; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 500; color: var(--text-secondary); margin-bottom: 0.4rem; }
.form-group input, .form-group textarea {
  width: 100%; padding: 0.85rem 1rem; border: 2px solid var(--border); border-radius: 10px;
  font-family: inherit; font-size: 1rem; background: var(--bg-card); color: var(--text-primary); transition: border-color 0.2s;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent); }
.form-group textarea { resize: vertical; min-height: 120px; }
.btn-submit { align-self: flex-start; padding: 0.85rem 2rem; }

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

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed; top: 0; right: -100%; width: 280px; height: 100vh; background: var(--bg-card);
    flex-direction: column; padding: 5rem 2rem 2rem; gap: 0; box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    transition: right 0.3s ease; border-left: 1px solid var(--border);
  }
  .nav-menu.active { right: 0; }
  .nav-menu li { padding: 1rem 0; border-bottom: 1px solid var(--border); }
  .theme-toggle { top: 1rem; right: 1rem; width: 44px; height: 44px; }
  .hero { padding: 5rem 1rem 3rem; }
  .hero-inner { grid-template-columns: 1fr; gap: 2rem; text-align: center; }
  .hero-content { text-align: center; order: 1; }
  .hero-image-wrap { order: 0; justify-self: center; }
  .hero-tagline { margin: 0 auto 2rem; }
  .hero-buttons { justify-content: center; flex-direction: row; }
  .hero-buttons .btn { justify-content: center; }
  .hero-image { width: 220px; height: 220px; }
  .section { padding: 3.5rem 0; }
  .section-title { margin-bottom: 2rem; }
  .contact-wrapper { grid-template-columns: 1fr; gap: 2rem; }
  .skills-grid { grid-template-columns: 1fr; }
  .skill-card-wide { grid-column: 1; }
  .projects-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .container { padding: 0 1rem; }
  .project-links { flex-direction: column; }
}