/* COMPONENTS */

.scroll-progress {
  position: fixed; top: 0; left: 0; width: 100%; height: 3px; z-index: 9999;
}
.scroll-progress__bar {
  height: 100%; width: 0%; background: var(--gradient-primary); transition: width 0.1s linear;
}

.header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  height: var(--header-height);
  transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}
.header.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.nav { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.nav__logo { display: flex; align-items: center; gap: 10px; font-family: var(--font-heading); font-weight: 700; font-size: 1.25rem; }
.nav__logo-mark {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; background: var(--gradient-primary);
  border-radius: var(--radius-sm); color: #fff; font-size: 1.1rem;
}
.nav__links { display: flex; align-items: center; gap: 8px; }
.nav__link {
  padding: 8px 16px; font-size: 0.9rem; font-weight: 500; color: var(--text-muted);
  border-radius: var(--radius-full); transition: color var(--transition), background var(--transition);
}
.nav__link:hover, .nav__link.active { color: var(--text); background: var(--glass-bg); }
.nav__actions { display: flex; align-items: center; gap: 12px; }

.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: var(--radius-full);
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  color: var(--text); position: relative; transition: background var(--transition);
}
.theme-toggle:hover { background: rgba(var(--primary-rgb), 0.1); }
.theme-toggle__icon { width: 20px; height: 20px; position: absolute; transition: opacity var(--transition), transform var(--transition); }
.theme-toggle__icon--sun { opacity: 0; transform: rotate(-90deg); }
.theme-toggle__icon--moon { opacity: 1; transform: rotate(0); }
[data-theme="light"] .theme-toggle__icon--sun { opacity: 1; transform: rotate(0); }
[data-theme="light"] .theme-toggle__icon--moon { opacity: 0; transform: rotate(90deg); }

.nav__toggle {
  display: none; flex-direction: column; gap: 5px;
  width: 44px; height: 44px; align-items: center; justify-content: center; border-radius: var(--radius-sm);
}
.nav__toggle span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: transform var(--transition), opacity var(--transition); }
.nav__toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.active span:nth-child(2) { opacity: 0; }
.nav__toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px; font-family: var(--font-heading); font-size: 0.95rem; font-weight: 600;
  border-radius: var(--radius-full); transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.btn--primary { background: var(--gradient-primary); color: #fff; box-shadow: 0 4px 20px rgba(var(--primary-rgb), 0.3); }
.btn--primary:hover { box-shadow: 0 8px 30px rgba(var(--primary-rgb), 0.45); transform: translateY(-2px); }
.btn--secondary { background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text); backdrop-filter: blur(10px); }
.btn--secondary:hover { border-color: var(--primary); background: rgba(var(--primary-rgb), 0.1); }
.btn--ghost { background: transparent; border: 1px solid var(--glass-border); color: var(--text-muted); }
.btn--ghost:hover { color: var(--text); border-color: var(--primary); }
.btn--sm { padding: 10px 20px; font-size: 0.85rem; }
.btn--full { width: 100%; }

.hero {
  min-height: 100vh; display: flex; flex-direction: column; justify-content: center; padding-top: var(--header-height);
}
.hero__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(40px, 6vw, 80px); align-items: center; }
.hero__greeting { font-family: var(--font-heading); font-size: 1.125rem; color: var(--primary); font-weight: 500; margin-bottom: 8px; }
.hero__title { font-family: var(--font-heading); font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 700; line-height: 1.1; letter-spacing: -0.03em; margin-bottom: 16px; }
.hero__typing { font-family: var(--font-heading); font-size: clamp(1.25rem, 3vw, 1.75rem); font-weight: 500; color: var(--text-muted); margin-bottom: 24px; min-height: 2.5rem; }
.hero__typing-text { color: var(--accent); font-weight: 600; }
.hero__typing-cursor { color: var(--primary); animation: blink 1s step-end infinite; }
.hero__tagline { font-size: clamp(1rem, 2vw, 1.125rem); color: var(--text-muted); max-width: 540px; margin-bottom: 36px; line-height: 1.8; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 40px; }
.hero__social { display: flex; gap: 12px; }

.social-link {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: var(--radius-full);
  background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text-muted);
  transition: color var(--transition), background var(--transition), transform var(--transition), border-color var(--transition);
}
.social-link svg { width: 20px; height: 20px; }
.social-link:hover { color: var(--primary); border-color: var(--primary); background: rgba(var(--primary-rgb), 0.1); transform: translateY(-3px); }

.hero__visual { position: relative; display: flex; justify-content: center; align-items: center; }
.hero__frame { position: relative; width: clamp(280px, 35vw, 400px); aspect-ratio: 1; }
.hero__frame-glow {
  position: absolute; inset: -20px; background: var(--gradient-primary);
  border-radius: var(--radius-xl); opacity: 0.2; filter: blur(40px); animation: pulseGlow 4s ease-in-out infinite;
}
.hero__frame-ring {
  position: absolute; inset: -4px; border-radius: var(--radius-xl); background: var(--gradient-primary); padding: 3px;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; animation: rotateRing 8s linear infinite;
}
.hero__image {
  width: 100%; height: 100%; object-fit: cover; object-position: center;
  border-radius: var(--radius-xl); position: relative; z-index: 1;
  background: var(--bg);
}
.hero__badge {
  position: absolute; display: flex; align-items: center; gap: 8px;
  padding: 10px 18px; font-size: 0.85rem; font-weight: 500; white-space: nowrap;
  animation: badgeFloat 6s ease-in-out infinite; z-index: 2;
}
.hero__badge--1 { top: 10%; right: -10%; }
.hero__badge--2 { bottom: 20%; left: -15%; animation-delay: -2s; }
.hero__badge--3 { bottom: 5%; right: 5%; animation-delay: -4s; }
.hero__scroll { display: flex; justify-content: center; margin-top: 60px; }
.hero__scroll-link { display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-muted); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; }
.hero__scroll-link:hover { color: var(--primary); }
.hero__scroll-line { width: 1px; height: 40px; background: linear-gradient(to bottom, var(--primary), transparent); animation: scrollLine 2s ease-in-out infinite; }

.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(40px, 6vw, 80px); align-items: start; }
.about__lead { font-size: 1.125rem; color: var(--text); margin-bottom: 20px; line-height: 1.8; }
.about__content p { color: var(--text-muted); margin-bottom: 16px; }
.about__content strong { color: var(--text); }
.about__highlights { display: flex; gap: 16px; margin: 32px 0; }
.about__highlight { flex: 1; padding: 20px; text-align: center; }
.about__highlight-num {
  display: block; font-family: var(--font-heading); font-size: 2rem; font-weight: 700;
  background: var(--gradient-text); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.about__highlight-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.about__tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  padding: 8px 16px; font-size: 0.85rem; font-weight: 500; color: var(--text-muted);
  background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: var(--radius-full);
  transition: border-color var(--transition), color var(--transition);
}
.tag:hover { border-color: var(--primary); color: var(--primary); }
.about__timeline-title { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 600; margin-bottom: 32px; }

.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: ''; position: absolute; left: 6px; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--secondary), var(--accent)); opacity: 0.3;
}
.timeline__item { position: relative; padding: 24px; margin-bottom: 24px; transition: transform var(--transition), box-shadow var(--transition); }
.timeline__item:hover { transform: translateX(8px); box-shadow: var(--shadow-glow); }
.timeline__marker {
  position: absolute; left: -32px; top: 28px; width: 14px; height: 14px;
  background: var(--gradient-primary); border-radius: 50%; border: 3px solid var(--bg);
  box-shadow: 0 0 12px rgba(var(--primary-rgb), 0.5);
}
.timeline__date { font-size: 0.8rem; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: 0.05em; }
.timeline__title { font-family: var(--font-heading); font-size: 1.125rem; font-weight: 600; margin: 8px 0; }
.timeline__desc { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; }

.skills__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.skill-card { padding: 32px; transition: transform var(--transition), box-shadow var(--transition); }
.skill-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-glow); }
.skill-card__header { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
.skill-card__icon { font-size: 1.5rem; }
.skill-card__title { font-family: var(--font-heading); font-size: 1.125rem; font-weight: 600; }
.skill-card__list { display: flex; flex-direction: column; gap: 16px; }
.skill-item { display: flex; flex-direction: column; gap: 6px; }
.skill-item span { font-size: 0.875rem; font-weight: 500; color: var(--text-muted); }
.skill-bar { height: 6px; background: rgba(var(--primary-rgb), 0.1); border-radius: var(--radius-full); overflow: hidden; }
.skill-bar__fill { height: 100%; width: 0; background: var(--gradient-primary); border-radius: var(--radius-full); transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1); }
.skill-bar__fill.animated { width: var(--progress); }

.experience__timeline { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.exp-card { padding: 32px; transition: transform var(--transition), box-shadow var(--transition); }
.exp-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-glow); }
.exp-card__period { font-size: 0.8rem; font-weight: 600; color: var(--accent); letter-spacing: 0.05em; margin-bottom: 12px; }
.exp-card__role { font-family: var(--font-heading); font-size: 1.375rem; font-weight: 600; margin-bottom: 4px; }
.exp-card__company { font-size: 0.95rem; color: var(--primary); font-weight: 500; margin-bottom: 16px; }
.exp-card__desc { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.exp-card__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.exp-card__tags li { padding: 4px 12px; font-size: 0.75rem; font-weight: 500; color: var(--text-muted); background: rgba(var(--primary-rgb), 0.08); border-radius: var(--radius-full); }

.projects__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.project-card { overflow: hidden; transition: transform var(--transition), box-shadow var(--transition); }
.project-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-lg), var(--shadow-glow); }
.project-card__visual { height: 180px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.project-card__visual--ai { background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.2), rgba(var(--secondary-rgb), 0.15)); }
.project-card__visual--research { background: linear-gradient(135deg, rgba(var(--secondary-rgb), 0.2), rgba(var(--accent-rgb), 0.15)); }
.project-card__visual--health { background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(var(--primary-rgb), 0.15)); }
.project-card__visual--commerce { background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.2), rgba(var(--primary-rgb), 0.15)); }
.project-card__visual--edu { background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(var(--secondary-rgb), 0.15)); }
.project-card__visual--task { background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.15), rgba(34, 197, 94, 0.15)); }
.project-card__visual--portfolio { background: linear-gradient(135deg, rgba(var(--secondary-rgb), 0.2), rgba(var(--primary-rgb), 0.2)); }
.project-card__visual--ml { background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.2), rgba(var(--secondary-rgb), 0.15)); }
.project-card__emoji { font-size: 4rem; transition: transform var(--transition); }
.project-card:hover .project-card__emoji { transform: scale(1.15) rotate(5deg); }
.project-card__body { padding: 28px; }
.project-card__title { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 600; margin-bottom: 12px; }
.project-card__overview { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; }
.project-card__meta { font-size: 0.85rem; color: var(--text-subtle); line-height: 1.8; margin-bottom: 16px; }
.project-card__meta strong { color: var(--text-muted); }
.project-card__tech { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.project-card__tech span { padding: 4px 12px; font-size: 0.75rem; font-weight: 500; color: var(--primary); background: rgba(var(--primary-rgb), 0.1); border-radius: var(--radius-full); }
.project-card__actions { display: flex; gap: 12px; }

.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cert-card { padding: 28px; text-align: center; transition: transform var(--transition), box-shadow var(--transition); }
.cert-card:hover { transform: translateY(-6px) scale(1.02); box-shadow: var(--shadow-glow); }
.cert-card__icon { font-size: 2.5rem; margin-bottom: 16px; }
.cert-card h3 { font-family: var(--font-heading); font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.cert-card p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }

.achievements__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.achievement-card { padding: 28px; text-align: center; transition: transform var(--transition); }
.achievement-card:hover { transform: translateY(-6px); }
.achievement-card__icon { font-size: 2rem; display: block; margin-bottom: 16px; }
.achievement-card h3 { font-family: var(--font-heading); font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.achievement-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

.research__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.research-card { padding: 28px; text-align: center; cursor: pointer; transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition); }
.research-card:hover, .research-card:focus { transform: translateY(-8px) scale(1.03); box-shadow: var(--shadow-glow); border-color: rgba(var(--primary-rgb), 0.3); outline: none; }
.research-card__icon { font-size: 2rem; margin-bottom: 12px; }
.research-card h3 { font-family: var(--font-heading); font-size: 0.95rem; font-weight: 600; margin-bottom: 8px; }
.research-card p { font-size: 0.8rem; color: var(--text-muted); }

.testimonials__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial { padding: 32px; margin: 0; transition: transform var(--transition); }
.testimonial:hover { transform: translateY(-6px); }
.testimonial__stars { color: #FBBF24; font-size: 1rem; letter-spacing: 2px; margin-bottom: 20px; }
.testimonial__text { font-size: 0.95rem; color: var(--text-muted); line-height: 1.8; font-style: italic; margin-bottom: 24px; }
.testimonial__author { display: flex; align-items: center; gap: 14px; }
.testimonial__avatar {
  width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  background: var(--gradient-primary); border-radius: var(--radius-full);
  font-family: var(--font-heading); font-weight: 700; font-size: 0.85rem; color: #fff;
}
.testimonial__name { font-family: var(--font-heading); font-style: normal; font-weight: 600; font-size: 0.95rem; display: block; }
.testimonial__role { font-size: 0.8rem; color: var(--text-subtle); }

.stats__grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.stat-item { padding: 32px 20px; text-align: center; transition: transform var(--transition); }
.stat-item:hover { transform: translateY(-6px); }
.stat-item__number {
  font-family: var(--font-heading); font-size: clamp(2rem, 4vw, 3rem); font-weight: 700;
  background: var(--gradient-text); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-item__suffix { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.stat-item__label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-top: 8px; text-transform: uppercase; letter-spacing: 0.05em; }

.contact__grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: start; }
.contact__form { padding: 40px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--text-muted); margin-bottom: 8px; }
.form-group input, .form-group textarea {
  width: 100%; padding: 14px 18px; background: rgba(var(--primary-rgb), 0.05);
  border: 1px solid var(--glass-border); border-radius: var(--radius-md); color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition); resize: vertical;
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-subtle); }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15); }
.form-status { margin-top: 16px; font-size: 0.9rem; text-align: center; min-height: 1.5em; }
.form-status.success { color: #22C55E; }
.form-status.error { color: #EF4444; }

.contact__info { display: flex; flex-direction: column; gap: 20px; }
.contact__card { padding: 28px; }
.contact__card-icon { font-size: 1.5rem; margin-bottom: 12px; }
.contact__card h3 { font-family: var(--font-heading); font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.contact__card a { color: var(--primary); font-size: 0.9rem; word-break: break-all; }
.contact__card a:hover { text-decoration: underline; }
.contact__card p { color: var(--text-muted); font-size: 0.9rem; }
.contact__social { display: flex; gap: 12px; margin-top: 8px; }
.contact__social-link {
  display: flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: var(--radius-md);
  background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text-muted);
  transition: color var(--transition), background var(--transition), transform var(--transition);
}
.contact__social-link svg { width: 22px; height: 22px; }
.contact__social-link:hover { color: var(--primary); background: rgba(var(--primary-rgb), 0.1); transform: translateY(-3px); }

.footer { border-top: 1px solid var(--glass-border); padding-top: 60px; }
.footer__inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer__logo { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 700; }
.footer__tagline { color: var(--text-muted); font-size: 0.9rem; margin-top: 12px; }
.footer__nav { display: flex; flex-direction: column; gap: 12px; }
.footer__nav a { color: var(--text-muted); font-size: 0.9rem; transition: color var(--transition); }
.footer__nav a:hover { color: var(--primary); }
.footer__social { display: flex; gap: 12px; justify-content: flex-end; }
.footer__social a {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: var(--radius-full);
  background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}
.footer__social a svg { width: 18px; height: 18px; }
.footer__social a:hover { color: var(--primary); background: rgba(var(--primary-rgb), 0.1); }
.footer__bottom { border-top: 1px solid var(--glass-border); padding: 24px 0; text-align: center; }
.footer__bottom p { font-size: 0.85rem; color: var(--text-subtle); }

.back-to-top {
  position: fixed; bottom: 32px; right: 32px; width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: var(--gradient-primary); color: #fff; border-radius: var(--radius-full);
  box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transform: translateY(20px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition); z-index: 900;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top svg { width: 22px; height: 22px; }
.back-to-top:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.cursor { position: fixed; top: 0; left: 0; pointer-events: none; z-index: 10001; mix-blend-mode: difference; }
.cursor__dot {
  position: absolute; width: 6px; height: 6px; background: #fff; border-radius: 50%;
  transform: translate(-50%, -50%); transition: transform 0.1s ease;
}
.cursor__ring {
  position: absolute; width: 40px; height: 40px;
  border: 1.5px solid rgba(255, 255, 255, 0.5); border-radius: 50%;
  transform: translate(-50%, -50%); transition: width 0.3s ease, height 0.3s ease, border-color 0.3s ease;
}
.cursor.hover .cursor__ring { width: 60px; height: 60px; border-color: rgba(255, 255, 255, 0.8); }
.cursor.hover .cursor__dot { transform: translate(-50%, -50%) scale(0.5); }