/* styles.css */

/* --- ROOT COLORS & THEMES --- */
:root {
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --secondary-color: #8b5cf6;
  --accent-color: #06b6d4;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;

  --bg-primary: #fff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --surface: #fff;
  --surface-variant: #e2e8f0;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --text-inverse: #fff;

  --border-color: #e2e8f0;
  --shadow-color: rgba(15, 23, 42, 0.1);
  --shadow-hover: rgba(15, 23, 42, 0.15);

  --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  --gradient-secondary: linear-gradient(135deg, var(--accent-color), var(--success-color));
  --gradient-accent: linear-gradient(135deg, var(--warning-color), var(--error-color));
}

[data-theme="dark"] {
  --primary-color: #818cf8;
  --primary-dark: #6366f1;
  --secondary-color: #a78bfa;
  --accent-color: #22d3ee;
  --success-color: #34d399;
  --warning-color: #fbbf24;
  --error-color: #f87171;

  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --surface: #1e293b;
  --surface-variant: #334155;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --text-inverse: #0f172a;

  --border-color: #334155;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.4);
}

/* --- BASE RESET & TYPOGRAPHY --- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; } /* Base font size */
body {
  font-family: "Inter", sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

/* --- CONTAINER --- */
.container, .nav-container, .hero-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* --- NAVIGATION --- */
.navbar {
  position: fixed; top: 0; width: 100%;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background 0.3s;
}
[data-theme="dark"] .navbar { background: rgba(15,23,42,0.95); }
.nav-container {
  display: flex; justify-content: space-between; align-items: center; height: 70px;
}
.logo-text {
  font-size: 1.5rem; font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-menu {
  display: flex; align-items: center; gap: 1.5rem;
}
.nav-link {
  text-decoration: none; color: var(--text-secondary); font-weight: 500;
  transition: color 0.3s;
  position: relative;
  padding: 0.5rem 0;
}
.nav-link:hover { color: var(--primary-color); }
.nav-link::after {
  content: ""; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
  background: var(--gradient-primary); transition: width 0.3s;
}
.nav-link:hover::after { width: 100%; }
.theme-toggle {
  background: none; border: 2px solid var(--border-color); border-radius: 50%;
  width: 45px; height: 45px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-primary); transition: border-color 0.3s, transform 0.3s;
}
.theme-toggle:hover { border-color: var(--primary-color); transform: scale(1.1); }
.hamburger { display: none; flex-direction: column; cursor: pointer; }
.hamburger span {
  width: 25px; height: 3px; background: var(--text-primary);
  margin: 3px 0; transition: 0.3s; border-radius: 2px;
}

/* --- HERO SECTION --- */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at 20% 80%, rgba(99,102,241,0.1) 0%, transparent, 50%),
              radial-gradient(circle at 80% 20%, rgba(139,92,246,0.1) 0%, transparent 50%);
  pointer-events: none;
}
.hero-container { position: relative; z-index: 1; }
.hero-content {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center;
}
.hero-title, .section-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem); font-weight: 700; line-height: 1.2; margin-bottom: 1rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  text-align: center;
}
.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, 1.5rem); color: var(--primary-color); font-weight: 600; margin-bottom: 1rem;
  text-align: center;
}
.hero-description, .section-description, .about-text p, .project-card p, .certificate-card p, .stat-card p {
  font-size: clamp(1rem, 2.5vw, 1.1rem); color: var(--text-secondary); margin-bottom: 2rem; line-height: 1.7;
  text-align: center;
}
.hero-buttons {
  display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center;
}
.btn {
  padding: 0.75rem 2rem;
  border-radius: 50px; text-decoration: none; font-weight: 600;
  transition: all 0.3s; display: inline-flex; align-items: center; gap: 0.5rem;
  border: none; cursor: pointer; font-size: 1rem;
}
.btn-primary {
  background: var(--gradient-primary); color: #fff;
  box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: 0 8px 25px rgba(99,102,241,0.4);
}
.btn-secondary {
  background: transparent; color: var(--primary-color); border: 2px solid var(--primary-color);
}
.btn-secondary:hover {
  background: var(--primary-color); color: #fff; transform: translateY(-2px);
}
.hero-visual { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 1rem;}
.floating-card {
  background: var(--surface); border-radius: 20px;
  padding: 1.5rem; box-shadow: 0 20px 40px var(--shadow-color);
  animation: float 6s ease-in-out infinite; border: 1px solid var(--border-color);
  flex-basis: 45%;
}
@keyframes float { 0%,100%{transform:translateY(0);} 50%{transform:translateY(-20px);} }
.card-content { text-align: center; }
.card-content .material-icons {
  font-size: 3rem; color: var(--primary-color); margin-bottom: 1rem;
}
.card-content h3 { font-size: 1.25rem; margin-bottom: 0.5rem; color: var(--text-primary);}
.card-content p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 0;}
.scroll-indicator {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  animation: bounce 2s infinite; color: var(--text-tertiary);
}
@keyframes bounce {
  0%,20%,50%,80%,100% { transform: translateX(-50%) translateY(0);}
  40% { transform: translateX(-50%) translateY(-10px);}
  60% { transform: translateX(-50%) translateY(-5px);}
}

/* --- SECTIONS --- */
section { padding: 5rem 1rem; }
.section-description {
  color: var(--text-secondary); margin-bottom: 3rem; max-width: 600px; margin-left: auto; margin-right: auto;
}

/* --- ABOUT --- */
.about { background: var(--bg-secondary);}
.about-content {
  display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; align-items: start;
}
.about-stats { display: flex; flex-direction: column; gap: 1.5rem;}
.stat-card {
  background: var(--surface); padding: 2rem; border-radius: 20px;
  text-align: center; box-shadow: 0 4px 15px var(--shadow-color); border: 1px solid var(--border-color);
  transition: all 0.3s;
}
.stat-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px var(--shadow-hover);}
.stat-card h3 { font-size: 2rem; font-weight: 700; color: var(--primary-color); margin-bottom: 0.5rem;}
.stat-card p { color: var(--text-secondary); font-weight: 500; margin-bottom: 0;}

/* --- EXPERIENCE & FUN ZONE LINK SECTIONS --- */
.experience-link-section, .fun-zone-section {
  background-color: var(--bg-primary);
}
.fun-zone-section {
  background-color: var(--bg-tertiary);
}

/* --- SKILLS --- */
.skills { background: var(--bg-secondary); }
.skills-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}
.skill-category {
  background: var(--surface); padding: 2rem; border-radius: 20px;
  box-shadow: 0 4px 15px var(--shadow-color); border: 1px solid var(--border-color);
  transition: all 0.3s;
}
.skill-category:hover { transform: translateY(-5px); box-shadow: 0 8px 25px var(--shadow-hover);}
.skill-category h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 1.5rem; color: var(--text-primary);}
.skill-items { display: flex; flex-wrap: wrap; gap: 0.75rem;}
.skill-tag {
  background: var(--gradient-primary); color: #fff; padding: 0.5rem 1rem;
  border-radius: 25px; font-size: 0.9rem; font-weight: 500; transition: transform 0.3s;
}
.skill-tag:hover { transform: scale(1.05); }

/* --- PROJECTS --- */
.projects { background: var(--bg-primary);}
.projects-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem; margin-bottom: 3rem;
}
.project-card {
  background: var(--surface); padding: 2rem; border-radius: 20px;
  box-shadow: 0 4px 15px var(--shadow-color); border: 1px solid var(--border-color);
  transition: all 0.3s; position: relative; overflow: hidden;
}
.project-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--gradient-primary);
}
.project-card:hover { transform: translateY(-10px); box-shadow: 0 15px 35px var(--shadow-hover);}
.project-icon {
  width: 60px; height: 60px; background: var(--gradient-primary); border-radius: 15px;
  display: flex; align-items: center; justify-content: center; margin-bottom: 1.5rem;
}
.project-icon .material-icons { color: #fff; font-size: 2rem;}
.project-card h3 { font-size: 1.4rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-primary);}
.project-tags { display: flex; flex-wrap: wrap; gap: 0.5rem;}
.tag {
  background: var(--surface-variant); color: var(--text-secondary);
  padding: 0.25rem 0.75rem; border-radius: 15px; font-size: 0.8rem; font-weight: 500;
}

/* --- CERTIFICATES --- */
.certificates { background: var(--bg-secondary); }
.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}
.certificate-card {
  background: var(--surface);
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 4px 15px var(--shadow-color);
  border: 1px solid var(--border-color);
  transition: all 0.3s;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.certificate-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px var(--shadow-hover);
}
.certificate-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-secondary);
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: #fff;
}
.certificate-icon .material-icons {
  font-size: 2.5rem;
}
.certificate-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.certificate-card p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}
.certificate-card .btn {
  margin-top: auto;
}

/* --- CONTACT --- */
.contact { background: var(--bg-primary);}
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2rem;
}
.contact-info { display: flex; flex-direction: column; gap: 2rem;}
.contact-item {
  display: flex; align-items: center; gap: 1rem; padding: 1.5rem;
  background: var(--surface); border-radius: 20px;
  box-shadow: 0 4px 15px var(--shadow-color); border: 1px solid var(--border-color);
  transition: all 0.3s;
}
.contact-item:hover { transform: translateY(-3px); box-shadow: 0 8px 25px var(--shadow-hover);}
.contact-item .material-icons { font-size: 2rem; color: var(--primary-color);}
.contact-item h4 { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.25rem; color: var(--text-primary);}
.contact-item a { color: var(--text-secondary); text-decoration: none; transition: color 0.3s;}
.contact-item a:hover { color: var(--primary-color);}
.contact-item .icon-github,
.contact-item .icon-linkedin,
.contact-item .icon-instagram {
  width: 2rem; height: 2rem; display: inline-block; vertical-align: middle;
  fill: var(--primary-color); transition: fill 0.3s;
}
.contact-item:hover .icon-github { fill: var(--secondary-color);}
.contact-item .icon-linkedin { fill: #0077b5;}
.contact-item:hover .icon-linkedin { fill: var(--secondary-color);}
.contact-item .icon-instagram { fill: #e1306c;}
.contact-item:hover .icon-instagram { fill: var(--secondary-color);}
.contact-form {
  background: var(--surface); padding: 2rem; border-radius: 20px;
  box-shadow: 0 4px 15px var(--shadow-color); border: 1px solid var(--border-color);
}
.form-group { margin-bottom: 1.5rem;}
.form-group input, .form-group textarea {
  width: 100%; padding: 1rem; border: 2px solid var(--border-color);
  border-radius: 10px; background: var(--bg-primary); color: var(--text-primary);
  font-family: inherit; font-size: 1rem; transition: border-color 0.3s, box-shadow 0.3s;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px;}
.form-response {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 10px;
    font-weight: 500;
    display: none;
}
.form-response.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}
.form-response.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

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

/* --- ANIMATIONS --- */
.fade-in { opacity: 0; transform: translateY(30px); transition: all 0.6s;}
.fade-in.visible { opacity: 1; transform: translateY(0);}

/* --- RESPONSIVE DESIGN --- */
@media (max-width: 992px) {
  .hero-content { 
    grid-template-columns: 1fr; 
    text-align: center;
  }
  .hero-text {
      order: 2;
  }
  .hero-image-placeholder {
      order: 1;
      margin-bottom: 2rem;
  }
  .hero-visual {
      order: 3;
      margin-top: 2rem;
  }
  .about-content, .contact-grid { 
      grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed; left: -100%; top: 70px; flex-direction: column;
    background: var(--surface); width: 100%; text-align: center;
    transition: left 0.3s; box-shadow: 0 10px 27px var(--shadow-color); padding: 2rem 0;
    height: calc(100vh - 70px);
    overflow-y: auto;
  }
  .nav-menu.active { left: 0; }
  .hamburger { display: flex; }
  .hamburger.active span:nth-child(2) { opacity: 0; }
  .hamburger.active span:nth-child(1) { transform: translateY(8px) rotate(45deg);}
  .hamburger.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg);}
  .hero-buttons { flex-direction: column; align-items: center; width: 100%; max-width: 300px; margin: 0 auto;}
  .btn { width: 100%; justify-content: center;}
}

@media (max-width: 480px) {
    section { padding: 3rem 1rem; }
    .hero-title, .section-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1.1rem; }
    .floating-card { flex-basis: 100%; }
}