/* ════════════════════════════════════════════
   SECTIONS — About · Experience · Projects
               Architecture · Skills · Education
               Contact · Footer
   ════════════════════════════════════════════ */

/* ── ABOUT ── */
.about-grid {
  display: grid; grid-template-columns: 1fr 1.4fr;
  gap: 5rem; align-items: center;
}
.about-card-wrap { position: relative; margin-bottom: 1.5rem; }
.about-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2.5rem;
  text-align: center;
  background-image: linear-gradient(135deg, rgba(34,211,238,0.04) 0%, transparent 60%);
  position: relative; overflow: hidden;
}
.about-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad);
}
.about-avatar { font-size: 4rem; margin-bottom: 1rem; display: block; }
.about-card-name { font-family: var(--font-d); font-size: 1.2rem; font-weight: 700; margin-bottom: 0.25rem; }
.about-card-title { color: var(--cyan); font-family: var(--font-m); font-size: 0.75rem; letter-spacing: 0.08em; }

.about-float-badge {
  position: absolute; bottom: -1rem; right: -1rem;
  background: var(--grad); color: #fff;
  border-radius: 12px; padding: 0.75rem 1rem;
  display: flex; align-items: center; gap: 0.4rem;
  font-weight: 700; box-shadow: 0 4px 20px rgba(34,211,238,0.25);
}
.about-float-badge .badge-num { font-family: var(--font-d); font-size: 1.4rem; line-height: 1; }
.about-float-badge span:last-child { font-size: 0.75rem; line-height: 1.2; }

.about-stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.stat-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem;
  text-align: center; transition: border-color 0.3s;
}
.stat-card:hover { border-color: var(--border2); }
.stat-num {
  font-family: var(--font-d); font-size: 1.8rem;
  font-weight: 800; color: var(--cyan); line-height: 1;
  margin-bottom: 0.3rem;
}
.stat-label { color: var(--text3); font-size: 0.8rem; }

.about-text .s-title { margin-top: 0.5rem; }
.about-text p { color: var(--text2); line-height: 1.8; margin-bottom: 1.1rem; }

.chip-list { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.75rem; }


/* ── EXPERIENCE TIMELINE ── */
.timeline { position: relative; padding-left: 2.5rem; }
.timeline::before {
  content: ''; position: absolute; left: 0; top: 8px; bottom: 8px;
  width: 2px; background: linear-gradient(to bottom, var(--cyan), var(--purple), transparent);
  border-radius: 2px;
}
.tl-item { position: relative; margin-bottom: 2.5rem; }
.tl-dot {
  position: absolute; left: -2.5rem; top: 1.25rem;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg2); border: 2px solid var(--text3);
  transform: translateX(-6px);
  transition: border-color 0.3s;
}
.tl-dot.active {
  border-color: var(--cyan); background: var(--cyan);
  animation: archPulse 2s infinite;
}
.tl-item:hover .tl-dot { border-color: var(--cyan); }

.tl-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.75rem 2rem;
  transition: border-color 0.3s, transform 0.3s;
}
.tl-card:hover { border-color: var(--border2); transform: translateX(4px); }

.tl-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; margin-bottom: 1rem; flex-wrap: wrap; }
.tl-company { font-family: var(--font-d); font-size: 1.1rem; font-weight: 700; margin-bottom: 0.2rem; }
.tl-role    { color: var(--cyan); font-size: 0.875rem; font-weight: 500; }
.tl-period  {
  font-family: var(--font-m); font-size: 0.75rem;
  color: var(--text3); white-space: nowrap;
  padding: 0.3rem 0.75rem; border-radius: 100px;
  border: 1px solid var(--border); background: var(--card2);
}

.tl-list { list-style: none; margin-bottom: 1.25rem; display: flex; flex-direction: column; gap: 0.4rem; }
.tl-list li { color: var(--text2); font-size: 0.9rem; padding-left: 1.1rem; position: relative; }
.tl-list li::before { content: '▸'; position: absolute; left: 0; color: var(--cyan); font-size: 0.7rem; top: 0.2rem; }
.tl-list li strong.hl { color: var(--cyan); }

.tl-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tl-tag {
  font-family: var(--font-m); font-size: 0.7rem;
  padding: 0.2rem 0.6rem; border-radius: 6px;
  background: rgba(34,211,238,0.07); border: 1px solid rgba(34,211,238,0.15); color: var(--cyan);
}


/* ── PROJECTS ── */
.filter-bar { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 2.5rem; }
.filter-btn {
  padding: 0.45rem 1.1rem; border-radius: 100px;
  border: 1px solid var(--border); background: transparent;
  color: var(--text2); font-size: 0.85rem; font-weight: 500;
  cursor: pointer; transition: all 0.25s;
}
.filter-btn:hover, .filter-btn.active {
  background: rgba(34,211,238,0.1);
  border-color: rgba(34,211,238,0.4);
  color: var(--cyan);
}

.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); gap: 1.5rem; }

.project-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: border-color 0.3s, transform 0.35s var(--ease), box-shadow 0.35s;
  display: flex; flex-direction: column;
}
.project-card:hover { border-color: var(--border2); transform: translateY(-6px); box-shadow: 0 20px 50px rgba(0,0,0,0.35); }
.project-card.hidden { display: none; }

.project-thumb {
  height: 120px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--thumb-from, #0f172a), var(--thumb-to, #1e293b));
  display: flex; align-items: center; justify-content: center;
}
.project-thumb::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(15,23,42,0.8));
}
.project-icon { font-size: 2.5rem; position: relative; z-index: 1; transition: transform 0.4s var(--ease); }
.project-card:hover .project-icon { transform: scale(1.15) rotate(-4deg); }

.project-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; gap: 0.75rem; }
.project-cat  { font-family: var(--font-m); font-size: 0.68rem; letter-spacing: 0.1em; color: var(--cyan); text-transform: uppercase; }
.project-name { font-family: var(--font-d); font-size: 1.05rem; font-weight: 700; line-height: 1.3; }
.project-desc { color: var(--text2); font-size: 0.875rem; line-height: 1.7; flex: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.project-tags span {
  font-family: var(--font-m); font-size: 0.68rem;
  padding: 0.2rem 0.55rem; border-radius: 5px;
  background: rgba(34,211,238,0.06); border: 1px solid rgba(34,211,238,0.14); color: var(--text2);
}
.project-links { display: flex; gap: 0.75rem; margin-top: auto; }
.project-link {
  display: inline-flex; align-items: center; gap: 0.35rem;
  color: var(--text2); font-size: 0.82rem; font-weight: 500;
  text-decoration: none; padding: 0.4rem 0;
  transition: color 0.2s;
}
.project-link:hover { color: var(--cyan); }


/* ── ARCHITECTURE ── */
.arch-diagram {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 3rem 2.5rem;
  background-image: linear-gradient(rgba(34,211,238,0.02) 1px,transparent 1px),
                    linear-gradient(90deg,rgba(34,211,238,0.02) 1px,transparent 1px);
  background-size: 32px 32px;
}

.arch-flow {
  display: flex; align-items: center; justify-content: flex-start;
  gap: 0.75rem; flex-wrap: nowrap; margin-bottom: 2rem;
  overflow-x: auto; padding-bottom: 0.5rem;
  scroll-behavior: smooth;
}
.arch-node {
  background: var(--card2); border: 2px solid var(--border);
  border-radius: 12px; padding: 1.25rem 1rem;
  text-align: center; min-width: 110px;
  transition: border-color 0.4s, box-shadow 0.4s;
  cursor: default;
}
.arch-node.active {
  border-color: var(--cyan);
  box-shadow: 0 0 0 0 rgba(34,211,238,.35);
  animation: archPulse 1.5s ease-in-out infinite;
}
.arch-node-icon { font-size: 1.75rem; margin-bottom: 0.4rem; }
.arch-node-label { font-family: var(--font-d); font-size: 0.8rem; font-weight: 700; color: var(--text); margin-bottom: 0.2rem; }
.arch-node-sub   { font-size: 0.68rem; color: var(--text3); font-family: var(--font-m); }

.arch-arrow { color: var(--text3); flex-shrink: 0; }
.arch-arrow svg { width: 36px; height: 14px; display: block; }

.arch-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; }
.arch-chip {
  font-family: var(--font-m); font-size: 0.72rem; letter-spacing: 0.05em;
  padding: 0.3rem 0.85rem; border-radius: 100px;
  border: 1px solid var(--border); color: var(--text3);
  transition: all 0.2s;
}
.arch-chip:hover { border-color: var(--border2); color: var(--text2); }


/* ── SKILLS ── */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px,1fr)); gap: 1.5rem; }
.skill-group {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.75rem;
  transition: border-color 0.3s;
}
.skill-group:hover { border-color: var(--border2); }

.skill-group-title {
  font-family: var(--font-d); font-size: 0.9rem; font-weight: 700;
  margin-bottom: 1.25rem; display: flex; align-items: center; gap: 0.5rem;
}

.skill-bars { display: flex; flex-direction: column; gap: 1rem; }
.skill-item { display: flex; flex-direction: column; }
.skill-meta { display: flex; justify-content: space-between; margin-bottom: 0.4rem; font-size: 0.85rem; }
.skill-meta span { color: var(--text2); }
.skill-pct { font-family: var(--font-m); color: var(--cyan) !important; font-size: 0.78rem; }
.skill-bar { height: 6px; background: var(--bg3); border-radius: 3px; overflow: hidden; }
.skill-fill {
  height: 100%; width: 0; border-radius: 3px;
  background: var(--grad2);
  transition: width 1.1s var(--ease);
}

.pill-group { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.skill-pill {
  font-family: var(--font-m); font-size: 0.72rem;
  padding: 0.3rem 0.75rem; border-radius: 8px;
  background: rgba(34,211,238,0.06); border: 1px solid rgba(34,211,238,0.15);
  color: var(--text2); transition: all 0.2s; cursor: default;
}
.skill-pill:hover { background: rgba(34,211,238,0.12); color: var(--cyan); border-color: rgba(34,211,238,0.3); }


/* ── EDUCATION ── */
.edu-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.75rem; }
.edu-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem;
  position: relative; overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
}
.edu-card::before { content:''; position:absolute; top:0; left:0; right:0; height:3px; background: var(--grad); }
.edu-card:hover { border-color: var(--border2); transform: translateY(-4px); }
.edu-icon { font-size: 2.5rem; margin-bottom: 1rem; display: block; }
.edu-school { font-family: var(--font-d); font-size: 1.05rem; font-weight: 700; margin-bottom: 0.3rem; }
.edu-degree { color: var(--cyan); font-size: 0.875rem; font-weight: 500; margin-bottom: 0.75rem; }
.edu-desc   { color: var(--text2); font-size: 0.875rem; line-height: 1.7; margin-bottom: 1.25rem; }
.edu-meta   { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.edu-chip   {
  font-family: var(--font-m); font-size: 0.7rem;
  padding: 0.2rem 0.65rem; border-radius: 100px;
  border: 1px solid var(--border); color: var(--text3);
}
.edu-chip.gpa { border-color: rgba(34,211,238,0.3); color: var(--cyan); background: rgba(34,211,238,0.07); }


/* ── CONTACT ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 4rem; align-items: start; }

.contact-info { display: flex; flex-direction: column; gap: 1.5rem; }
.contact-item { display: flex; align-items: flex-start; gap: 1rem; }
.contact-icon {
  width: 42px; height: 42px; border-radius: 10px;
  background: rgba(34,211,238,0.08); border: 1px solid rgba(34,211,238,0.18);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; color: var(--cyan);
}
.contact-item-label { font-family: var(--font-m); font-size: 0.72rem; color: var(--text3); letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 0.2rem; }
.contact-item-value { font-size: 0.95rem; color: var(--text); }
.contact-item-value.available { color: #4ade80; }

.contact-social-row { display: flex; gap: 0.75rem; margin-top: 0.5rem; }
.contact-social-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.6rem 1.2rem; border-radius: 9px;
  border: 1px solid var(--border); background: var(--card);
  color: var(--text2); font-size: 0.875rem; font-weight: 500;
  text-decoration: none; transition: all 0.25s;
}
.contact-social-btn:hover { border-color: var(--border2); color: var(--cyan); transform: translateY(-2px); }

/* form */
.contact-form { display: flex; flex-direction: column; gap: 1.2rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; position: relative; }
.form-label { font-size: 0.82rem; font-weight: 500; color: var(--text2); }
.form-input, .form-textarea {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 9px; padding: 0.8rem 1rem;
  color: var(--text); font-family: var(--font-b); font-size: 0.9rem;
  transition: border-color 0.25s, box-shadow 0.25s;
  resize: none; outline: none; width: 100%;
}
.form-input:focus, .form-textarea:focus {
  border-color: rgba(34,211,238,0.45);
  box-shadow: 0 0 0 3px rgba(34,211,238,0.08);
}
.form-input.invalid, .form-textarea.invalid { border-color: rgba(248,113,113,0.6); }
.form-error { font-size: 0.78rem; color: #f87171; display: none; }
.form-group.has-error .form-error { display: block; }
.form-group.has-error .form-input,
.form-group.has-error .form-textarea { border-color: rgba(248,113,113,0.5); }

.form-submit {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.6rem;
  padding: 0.9rem 2rem; border-radius: 10px;
  background: var(--grad); color: #fff;
  font-family: var(--font-b); font-size: 0.95rem; font-weight: 600;
  border: none; cursor: pointer;
  transition: opacity 0.25s, transform 0.25s;
}
.form-submit:hover { opacity: 0.87; transform: translateY(-2px); }
.form-submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.submit-spinner svg { animation: spin 0.8s linear infinite; }

.form-success {
  display: none; align-items: center; gap: 0.6rem;
  padding: 0.9rem 1.25rem; border-radius: 10px;
  background: rgba(74,222,128,0.1); border: 1px solid rgba(74,222,128,0.3);
  color: #4ade80; font-size: 0.9rem; font-weight: 500;
}
.form-success.show { display: flex; }


/* ── FOOTER ── */
#footer {
  background: var(--bg2); border-top: 1px solid var(--border);
  padding: 2.5rem 0 1.5rem;
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1.5rem; margin-bottom: 1.5rem;
}
.footer-logo { margin-bottom: 0.5rem; }
.footer-copy { color: var(--text3); font-size: 0.82rem; }
.footer-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.footer-links a { color: var(--text3); text-decoration: none; font-size: 0.85rem; transition: color 0.2s; }
.footer-links a:hover { color: var(--cyan); }
.footer-socials { display: flex; gap: 0.75rem; }
.footer-socials a {
  width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--card);
  display: flex; align-items: center; justify-content: center;
  color: var(--text3); transition: all 0.25s;
}
.footer-socials a:hover { color: var(--cyan); border-color: var(--border2); }
#back-top {
  display: block; margin: 0 auto;
  background: rgba(34,211,238,0.08); border: 1px solid var(--border);
  color: var(--text2); padding: 0.5rem 1.25rem;
  border-radius: 8px; cursor: pointer; font-size: 0.8rem;
  font-family: var(--font-m); transition: all 0.25s;
}
#back-top:hover { color: var(--cyan); border-color: var(--border2); transform: translateY(-2px); }