/* ============================================================
   RESET & VARIABLES
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --accent:      #6366f1;
  --accent-rgb:  99, 102, 241;
  --accent-soft: #818cf8;
  --accent-bg:   #eef2ff;
  --bg:          #ffffff;
  --bg-alt:      #f8fafc;
  --surface:     #ffffff;
  --border:      #e2e8f0;
  --text:        #0f172a;
  --text-2:      #475569;
  --text-3:      #94a3b8;
  --green:       #10b981;
  --orange:      #f59e0b;
  --purple:      #8b5cf6;
  --blue:        #3b82f6;
  --radius:      14px;
  --shadow-sm:   0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:   0 4px 16px rgba(0,0,0,.08);
  --shadow-lg:   0 16px 40px rgba(0,0,0,.10);
  --nav-h:       68px;
  --transition:  .3s cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
  --accent:      #818cf8;
  --accent-rgb:  129, 140, 248;
  --accent-soft: #a5b4fc;
  --accent-bg:   #1e1b4b;
  --bg:          #0f172a;
  --bg-alt:      #1e293b;
  --surface:     #1e293b;
  --border:      #334155;
  --text:        #f1f5f9;
  --text-2:      #94a3b8;
  --text-3:      #64748b;
  --shadow-sm:   0 1px 3px rgba(0,0,0,.3);
  --shadow-md:   0 4px 16px rgba(0,0,0,.4);
  --shadow-lg:   0 16px 40px rgba(0,0,0,.5);
}

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body { font-family: 'Inter', system-ui, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; transition: background var(--transition), color var(--transition); }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 1.5rem; }

/* ============================================================
   NAV
   ============================================================ */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
[data-theme="dark"] #navbar { background: rgba(15,23,42,.85); }
#navbar.scrolled { box-shadow: var(--shadow-md); }

.nav-inner {
  max-width: 1140px; margin: 0 auto; padding: 0 1.5rem;
  height: 100%; display: flex; align-items: center; gap: 2rem;
}

.nav-logo {
  font-weight: 800; font-size: 1.25rem; letter-spacing: -.02em;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  flex-shrink: 0;
}

.nav-links {
  display: flex; gap: .25rem; margin-left: auto;
}
.nav-links a {
  padding: .4rem .75rem; border-radius: 8px; font-size: .9rem; font-weight: 500;
  color: var(--text-2); transition: color var(--transition), background var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); background: var(--accent-bg); }

.theme-toggle {
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: 8px;
  width: 38px; height: 38px; cursor: pointer; display: flex; align-items: center; justify-content: center;
  color: var(--text-2); transition: all var(--transition); flex-shrink: 0;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: .25rem;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--text);
  border-radius: 2px; transition: all var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================================
   HERO
   ============================================================ */
#hero {
  min-height: 100vh; min-height: 100dvh; display: flex; align-items: center; justify-content: center;
  padding: calc(var(--nav-h) + 2rem) 1.5rem 4rem;
  position: relative; overflow: hidden; text-align: center;
}

.hero-bg {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0; z-index: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(var(--accent-rgb), .12), transparent 70%);
}
.hero-bg::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%236366f1' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content { position: relative; z-index: 1; max-width: 680px; }

.hero-avatar {
  width: 90px; height: 90px; border-radius: 50%; margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem; font-weight: 800; color: #fff;
  box-shadow: 0 0 0 4px var(--bg), 0 0 0 8px rgba(var(--accent-rgb), .20);
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero-tag {
  display: inline-block; padding: .35rem 1rem; border-radius: 999px;
  background: var(--accent-bg); color: var(--accent); font-size: .85rem; font-weight: 600;
  margin-bottom: 1rem; letter-spacing: .02em;
}

.hero-name {
  font-size: clamp(2.4rem, 7vw, 4rem); font-weight: 800; letter-spacing: -.03em;
  line-height: 1.1; margin-bottom: 1.25rem;
}
.hero-name span { color: var(--accent); }

.hero-desc { font-size: 1.1rem; color: var(--text-2); max-width: 520px; margin: 0 auto 2rem; }

.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2rem; }

.hero-socials {
  display: flex; gap: 1rem; justify-content: center;
}
.hero-socials a {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--bg-alt); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-2); transition: all var(--transition);
}
.hero-socials a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.hero-socials svg { width: 18px; height: 18px; }

.hero-scroll {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: .25rem;
  color: var(--text-3); font-size: .75rem; animation: bounce 2s ease-in-out infinite;
}
.hero-scroll svg { width: 20px; height: 20px; }

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .65rem 1.5rem; border-radius: 10px; font-size: .9rem; font-weight: 600;
  cursor: pointer; border: 2px solid transparent; transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent); color: #fff;
}
.btn-primary:hover { background: var(--accent-soft); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(var(--accent-rgb), .35); }
.btn-outline {
  background: transparent; border-color: var(--border); color: var(--text);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-full { width: 100%; justify-content: center; }

/* ============================================================
   SECTIONS
   ============================================================ */
.section { padding: 6rem 0; }
.section-alt { background: var(--bg-alt); }

.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-tag {
  display: inline-block; padding: .3rem .9rem; border-radius: 999px;
  background: var(--accent-bg); color: var(--accent); font-size: .8rem; font-weight: 600;
  letter-spacing: .05em; text-transform: uppercase; margin-bottom: .75rem;
}
.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; letter-spacing: -.03em;
}

/* ============================================================
   REVEAL ANIMATION
   ============================================================ */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start;
}
.about-text p { color: var(--text-2); margin-bottom: 1rem; font-size: 1.02rem; }
.about-text p:last-child { margin-bottom: 0; }
.about-text strong { color: var(--text); font-weight: 600; }

.about-cards { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }

.info-card {
  display: flex; align-items: flex-start; gap: .75rem;
  padding: .9rem 1rem; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow-sm); transition: box-shadow var(--transition), border-color var(--transition);
}
.info-card:hover { box-shadow: var(--shadow-md); border-color: var(--accent); }
.info-card svg { width: 18px; height: 18px; color: var(--accent); flex-shrink: 0; margin-top: 2px; }
.info-label { display: block; font-size: .72rem; font-weight: 600; color: var(--text-3); text-transform: uppercase; letter-spacing: .05em; }
.info-value { display: block; font-size: .85rem; font-weight: 500; color: var(--text); margin-top: .1rem; }

/* ============================================================
   TIMELINE
   ============================================================ */
.timeline { position: relative; max-width: 780px; margin: 0 auto; }
.timeline::before {
  content: ''; position: absolute; left: 20px; top: 0; bottom: 0;
  width: 2px; background: var(--border);
}

.timeline-item { position: relative; padding-left: 60px; margin-bottom: 2rem; }
.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
  position: absolute; left: 11px; top: 22px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--bg);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), .25);
}
[data-theme="dark"] .timeline-dot { border-color: var(--bg-alt); }

.timeline-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  box-shadow: var(--shadow-sm); transition: box-shadow var(--transition);
}
.timeline-card:hover { box-shadow: var(--shadow-md); }

.timeline-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 1rem; margin-bottom: .5rem; flex-wrap: wrap;
}
.timeline-header h3 { font-size: 1.05rem; font-weight: 700; }
.timeline-org { font-size: .875rem; color: var(--accent); font-weight: 500; margin-top: .2rem; }
.timeline-date {
  font-size: .8rem; font-weight: 600; color: var(--text-3);
  background: var(--bg-alt); padding: .2rem .6rem; border-radius: 6px; white-space: nowrap;
}
.timeline-desc { font-size: .9rem; color: var(--text-2); margin: .75rem 0; }

/* ============================================================
   TAGS
   ============================================================ */
.tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .75rem; }
.tag {
  font-size: .75rem; font-weight: 500; padding: .25rem .6rem; border-radius: 6px;
  background: var(--bg-alt); color: var(--text-2); border: 1px solid var(--border);
}
.tag-accent { background: var(--accent-bg); color: var(--accent); border-color: rgba(var(--accent-rgb), .30); }

/* ============================================================
   EXPERIENCE GRID
   ============================================================ */
.experience-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

.exp-card {
  display: flex; gap: 1rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  box-shadow: var(--shadow-sm); transition: box-shadow var(--transition), transform var(--transition);
}
.exp-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }

.exp-icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.exp-icon svg { width: 20px; height: 20px; }
.exp-icon--blue   { background: #eff6ff; color: var(--blue); }
.exp-icon--green  { background: #ecfdf5; color: var(--green); }
.exp-icon--orange { background: #fffbeb; color: var(--orange); }
.exp-icon--purple { background: #f5f3ff; color: var(--purple); }
[data-theme="dark"] .exp-icon--blue   { background: #1e3a5f; }
[data-theme="dark"] .exp-icon--green  { background: #064e3b; }
[data-theme="dark"] .exp-icon--orange { background: #451a03; }
[data-theme="dark"] .exp-icon--purple { background: #2e1065; }

.exp-body { flex: 1; }
.exp-header { display: flex; justify-content: space-between; align-items: flex-start; gap: .5rem; flex-wrap: wrap; margin-bottom: .2rem; }
.exp-header h3 { font-size: .95rem; font-weight: 700; }
.exp-date { font-size: .75rem; font-weight: 600; color: var(--text-3); background: var(--bg-alt); padding: .15rem .5rem; border-radius: 5px; white-space: nowrap; }
.exp-org { font-size: .8rem; color: var(--accent); font-weight: 500; margin-bottom: .5rem; }
.exp-desc { font-size: .875rem; color: var(--text-2); }

/* ============================================================
   SKILLS
   ============================================================ */
.skills-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.skills-subtitle { font-size: 1rem; font-weight: 700; margin-bottom: 1.25rem; }

.skill-bar-list { display: flex; flex-direction: column; gap: 1.25rem; }
.skill-bar-item {}
.skill-bar-header { display: flex; justify-content: space-between; font-size: .875rem; font-weight: 500; margin-bottom: .4rem; }
.skill-bar-header span:last-child { color: var(--accent); font-weight: 600; }

.skill-bar-track {
  height: 8px; background: var(--border); border-radius: 999px; overflow: hidden;
}
.skill-bar-fill {
  height: 100%; width: 0; border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transition: width 1.2s cubic-bezier(.4,0,.2,1);
}

.tech-grid { display: flex; flex-wrap: wrap; gap: .5rem; }
.tech-pill {
  font-size: .8rem; font-weight: 500; padding: .3rem .75rem;
  border-radius: 999px; background: var(--accent-bg); color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), .25);
  transition: all var(--transition);
}
.tech-pill:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }

.lang-list { display: flex; flex-direction: column; gap: .75rem; }
.lang-item { display: flex; align-items: center; gap: .75rem; }
.lang-flag { font-size: 1.4rem; line-height: 1; }
.lang-info { flex: 1; }
.lang-name { display: block; font-size: .875rem; font-weight: 600; }
.lang-level { display: block; font-size: .75rem; color: var(--text-3); }
.lang-dots { display: flex; gap: 4px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.dot.filled { background: var(--accent); }

/* ============================================================
   BLOG
   ============================================================ */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }

.blog-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: box-shadow var(--transition), transform var(--transition);
}
.blog-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }

.blog-img {
  height: 180px; position: relative;
  background-size: cover; background-position: center;
}

.blog-img--finland {
  background: linear-gradient(135deg, #1e3a5f 0%, #0ea5e9 50%, #38bdf8 100%);
}
.blog-img--finland::after {
  content: '🇫🇮'; position: absolute; font-size: 3rem;
  top: 50%; left: 50%; transform: translate(-50%,-50%);
}
.blog-img--lab {
  background: linear-gradient(135deg, #1e1b4b 0%, #6366f1 60%, #a78bfa 100%);
}
.blog-img--lab::after {
  content: '🔬'; position: absolute; font-size: 3rem;
  top: 50%; left: 50%; transform: translate(-50%,-50%);
}
.blog-img--abroad {
  background: linear-gradient(135deg, #064e3b 0%, #059669 60%, #34d399 100%);
}
.blog-img--abroad::after {
  content: '✈️'; position: absolute; font-size: 3rem;
  top: 50%; left: 50%; transform: translate(-50%,-50%);
}

.blog-category {
  position: absolute; top: 1rem; left: 1rem;
  font-size: .72rem; font-weight: 600; padding: .25rem .65rem;
  border-radius: 999px; background: rgba(255,255,255,.15);
  backdrop-filter: blur(8px); color: #fff; letter-spacing: .04em;
  border: 1px solid rgba(255,255,255,.2);
}

.blog-body { padding: 1.25rem; }
.blog-date { font-size: .78rem; color: var(--text-3); margin-bottom: .4rem; }
.blog-body h3 { font-size: 1rem; font-weight: 700; margin-bottom: .5rem; }
.blog-body p { font-size: .875rem; color: var(--text-2); margin-bottom: 1rem; }
.blog-link { font-size: .875rem; font-weight: 600; color: var(--accent); transition: gap var(--transition); }
.blog-link:hover { text-decoration: underline; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }

.contact-info h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: .75rem; }
.contact-info > p { color: var(--text-2); margin-bottom: 1.5rem; }

.contact-details { display: flex; flex-direction: column; gap: .75rem; margin-bottom: 1.5rem; }
.contact-link {
  display: flex; align-items: center; gap: .6rem;
  font-size: .9rem; color: var(--text-2); transition: color var(--transition);
}
.contact-link:hover { color: var(--accent); }
.contact-link svg { width: 18px; height: 18px; flex-shrink: 0; }
.location-link { cursor: default; }

.map-container {
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); height: 200px;
}
.map-container iframe { width: 100%; height: 100%; border: none; filter: grayscale(20%); }

.contact-form {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem; box-shadow: var(--shadow-sm);
}
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: .875rem; font-weight: 600; margin-bottom: .4rem; }
.form-group input, .form-group textarea {
  width: 100%; padding: .65rem 1rem; border-radius: 10px;
  border: 1.5px solid var(--border); background: var(--bg-alt);
  color: var(--text); font-family: inherit; font-size: .9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), .15);
}
.form-group input.error, .form-group textarea.error {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239,68,68,.12);
}
.form-group textarea { resize: vertical; min-height: 130px; }
.field-error { display: block; font-size: .78rem; color: #ef4444; margin-top: .3rem; min-height: 1.1em; }

.form-success {
  display: none; align-items: center; gap: .5rem; justify-content: center;
  padding: .75rem 1rem; border-radius: 10px; margin-top: 1rem;
  background: #ecfdf5; color: var(--green); font-size: .875rem; font-weight: 500;
  border: 1px solid #a7f3d0;
}
.form-success.show { display: flex; }
.form-success svg { width: 18px; height: 18px; }

/* ============================================================
   FOOTER
   ============================================================ */
#footer {
  background: var(--bg-alt); border-top: 1px solid var(--border);
  padding: 2rem 0;
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
}
.footer-copy { font-size: .85rem; color: var(--text-3); }
.footer-socials { display: flex; gap: .75rem; }
.footer-socials a {
  width: 34px; height: 34px; border-radius: 8px; display: flex; align-items: center; justify-content: center;
  color: var(--text-3); background: var(--surface); border: 1px solid var(--border);
  transition: all var(--transition);
}
.footer-socials a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }
.footer-socials svg { width: 16px; height: 16px; }

.back-top {
  width: 36px; height: 36px; border-radius: 8px; display: flex; align-items: center; justify-content: center;
  background: var(--accent); color: #fff; transition: all var(--transition);
}
.back-top:hover { background: var(--accent-soft); transform: translateY(-2px); }
.back-top svg { width: 18px; height: 18px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-cards { grid-template-columns: 1fr 1fr; }
  .experience-grid { grid-template-columns: 1fr; }
  .skills-layout { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    flex-direction: column; padding: 1rem 1.5rem; gap: .25rem;
    transform: translateY(-120%); opacity: 0; pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .nav-links a { padding: .6rem .75rem; }
  .nav-toggle { display: flex; }

  .blog-grid { grid-template-columns: 1fr; }
  .about-cards { grid-template-columns: 1fr; }
  .timeline::before { left: 14px; }
  .timeline-item { padding-left: 46px; }
  .timeline-dot { left: 5px; }
  .timeline-header { flex-direction: column; }
  .footer-inner { justify-content: center; text-align: center; }
}

@media (max-width: 480px) {
  .section { padding: 4rem 0; }
  .exp-card { flex-direction: column; }
  .hero-actions { flex-direction: column; align-items: center; }
}