/* ═══════════════════════════════════════════════
   PORTFOLIO CSS — style.css
   Import in index.html as <link rel="stylesheet" href="style.css">
═══════════════════════════════════════════════ */

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

:root {
  --navy:        #0a0f2e;
  --navy-mid:    #111936;
  --navy-soft:   #1a2250;
  --accent:      #00d4ff;
  --accent2:     #7c4dff;
  --accent3:     #00e5a0;
  --text:        #e8eaf2;
  --text-muted:  #8a90b0;
  --text-dim:    #555e80;
  --border:      rgba(255, 255, 255, 0.08);
  --card:        rgba(255, 255, 255, 0.04);
  --card-hover:  rgba(255, 255, 255, 0.08);
  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;
  --transition:  0.25s ease;
  --radius:      12px;
  --radius-sm:   8px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--navy);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  font-size: 16px;
}

img { max-width: 100%; display: block; }
a  { color: inherit; }


/* ─── NAVIGATION ─── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 5%;
  background: rgba(10, 15, 46, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  transition: padding var(--transition), background var(--transition);
}

nav.scrolled {
  padding: 0.75rem 5%;
  background: rgba(10, 15, 46, 0.97);
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  cursor: pointer;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  transition: color var(--transition);
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

.nav-links a.active::after,
.nav-links a:hover::after {
  width: 100%;
}

/* Hamburger toggle (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }


/* ─── HERO ─── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 7rem 5% 4rem;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 60% at 20% 40%, rgba(0,212,255,0.09) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(124,77,255,0.11) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 50% 10%, rgba(0,229,160,0.07) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 0%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.25);
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  padding: 0.4rem 1.1rem;
  border-radius: 100px;
  margin-bottom: 1.75rem;
  text-transform: uppercase;
  font-weight: 500;
}

.hero-badge::before {
  content: '';
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 55%, var(--accent3) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 300;
  max-width: 540px;
  margin: 0 auto 2.5rem;
  line-height: 1.65;
}

.hero-sub em {
  color: var(--accent3);
  font-style: normal;
  font-weight: 400;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 2.25rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: bounce 2.5s ease-in-out infinite;
}

.hero-scroll::after {
  content: '';
  width: 1px; height: 52px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}


/* ─── BUTTONS ─── */
.btn {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: var(--accent);
  color: var(--navy);
}

.btn-primary:hover {
  background: #33ddff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,212,255,0.3);
}

.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: rgba(255,255,255,0.28);
  background: var(--card-hover);
  transform: translateY(-2px);
}


/* ─── LAYOUT HELPERS ─── */
section { padding: 6rem 5%; }

.section-alt { background: rgba(255,255,255,0.016); }

.container {
  max-width: 1100px;
  margin: 0 auto;
}

.section-head { margin-bottom: 3.5rem; }

.section-label {
  font-size: 0.73rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-label::before {
  content: '';
  width: 22px; height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin-bottom: 0.9rem;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 500px;
  line-height: 1.65;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 0 5%;
}


/* ─── ABOUT ─── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.65fr;
  gap: 4.5rem;
  align-items: center;
}

.about-visual {
  aspect-ratio: 1;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(0,212,255,0.1), rgba(124,77,255,0.15));
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition);
}

.about-visual:hover { border-color: rgba(0,212,255,0.3); }

.about-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 70%, rgba(0,229,160,0.08), transparent 60%);
  pointer-events: none;
}

.about-initials {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 4rem;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.04em;
  line-height: 1;
  position: relative;
  z-index: 1;
}

.about-text h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-size: 0.97rem;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.tag {
  font-size: 0.8rem;
  padding: 0.3rem 0.9rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--card);
  transition: all var(--transition);
  cursor: default;
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,212,255,0.07);
}


/* ─── SKILLS ─── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all 0.35s ease;
}

.skill-card:hover {
  border-color: rgba(0,212,255,0.25);
  background: var(--card-hover);
  transform: translateY(-5px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
}

.skill-icon {
  font-size: 1.8rem;
  margin-bottom: 0.8rem;
  display: block;
}

.skill-card h4 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.82rem;
  margin-bottom: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.skill-list {
  list-style: none;
}

.skill-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.skill-list li:last-child { border-bottom: none; }

.skill-list li::before {
  content: '→';
  color: var(--accent3);
  font-size: 0.72rem;
  flex-shrink: 0;
}


/* ─── PROJECTS ─── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.35s ease;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: rgba(0,212,255,0.3);
  transform: translateY(-6px);
  box-shadow: 0 24px 50px rgba(0,0,0,0.35);
}

.project-thumb {
  height: 185px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.25rem;
  position: relative;
  overflow: hidden;
  transition: filter 0.3s;
}

.project-card:hover .project-thumb { filter: brightness(1.15); }

.project-thumb.t1 { background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,77,255,0.18)); }
.project-thumb.t2 { background: linear-gradient(135deg, rgba(124,77,255,0.18), rgba(0,229,160,0.12)); }
.project-thumb.t3 { background: linear-gradient(135deg, rgba(0,229,160,0.13), rgba(0,212,255,0.15)); }
.project-thumb.t4 { background: linear-gradient(135deg, rgba(255,100,100,0.12), rgba(124,77,255,0.18)); }

.project-body {
  padding: 1.4rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  margin-bottom: 0.5rem;
}

.project-body p {
  font-size: 0.89rem;
  color: var(--text-muted);
  flex: 1;
  margin-bottom: 1rem;
  line-height: 1.55;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.tech-pill {
  font-size: 0.72rem;
  padding: 0.2rem 0.7rem;
  border-radius: 100px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.22);
  color: var(--accent);
  font-weight: 500;
}

.project-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.project-links a {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.4rem 0.95rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
  font-weight: 500;
}

.project-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,212,255,0.07);
}


/* ─── TIMELINE / EXPERIENCE ─── */
.timeline {
  position: relative;
  padding-left: 2.25rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.625rem;
  top: 0.4rem;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.2), 0 0 12px rgba(0,212,255,0.4);
}

.timeline-meta {
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}

.timeline-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.timeline-org {
  color: var(--accent3);
  font-size: 0.88rem;
  margin-bottom: 0.85rem;
  font-weight: 500;
}

.timeline-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding-left: 1.1rem;
}

.timeline-desc li { margin-bottom: 0.35rem; }
.timeline-desc li::marker { color: var(--accent); }


/* ─── EDUCATION & CERTS ─── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.edu-card,
.cert-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition);
}

.edu-card:hover { border-color: rgba(0,212,255,0.3); }
.cert-card:hover { border-color: rgba(124,77,255,0.4); }

.certs-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.year {
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.edu-card h4,
.cert-card h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  margin-bottom: 0.35rem;
}

.edu-card p,
.cert-card p { font-size: 0.88rem; color: var(--text-muted); }

.cert-badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 0.2rem 0.8rem;
  border-radius: 100px;
  background: rgba(124,77,255,0.12);
  border: 1px solid rgba(124,77,255,0.3);
  color: #c0a8ff;
  margin-top: 0.8rem;
  font-weight: 500;
}


/* ─── CONTACT ─── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4.5rem;
  align-items: start;
}

.contact-info .section-title { margin-bottom: 0.75rem; }

.contact-info > p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.contact-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-links a {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color var(--transition);
}

.contact-links a:hover { color: var(--accent); }

.contact-icon {
  width: 38px; height: 38px;
  border-radius: var(--radius-sm);
  background: var(--card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  flex-shrink: 0;
  transition: border-color var(--transition);
}

.contact-links a:hover .contact-icon {
  border-color: rgba(0,212,255,0.35);
}

/* Contact form */
.contact-form-wrap { position: relative; }

.form-success {
  background: rgba(0,229,160,0.1);
  border: 1px solid rgba(0,229,160,0.3);
  color: var(--accent3);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  font-size: 0.92rem;
  margin-bottom: 1.25rem;
}

.form-success.hidden { display: none; }

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-form input,
.contact-form textarea {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.82rem 1rem;
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
  outline: none;
  width: 100%;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--text-dim);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(0,212,255,0.45);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.08);
}

.contact-form input.invalid,
.contact-form textarea.invalid {
  border-color: rgba(255,100,100,0.5);
}

.contact-form textarea { min-height: 130px; }

.field-error {
  font-size: 0.78rem;
  color: #ff7070;
  display: none;
  padding-left: 2px;
}

.field-error.visible { display: block; }

#submitBtn[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}


/* ─── FOOTER ─── */
footer {
  text-align: center;
  padding: 2.5rem 5%;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.82rem;
}

footer span { color: var(--accent3); }

.footer-sub {
  margin-top: 0.5rem;
  color: var(--text-dim);
}

.footer-sub a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-sub a:hover { color: var(--accent); }


/* ─── BACK TO TOP ─── */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--navy);
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.3s, transform 0.3s;
  z-index: 500;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0,212,255,0.3);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}

.back-to-top:hover { background: #33ddff; transform: translateY(-3px); }


/* ─── SCROLL REVEAL ─── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ─── ANIMATIONS ─── */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  animation: fadeUp 0.75s ease forwards;
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.35; transform: scale(0.8); }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(7px); }
}


/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .about-grid      { grid-template-columns: 1fr; gap: 2.5rem; }
  .two-col         { grid-template-columns: 1fr; }
  .contact-grid    { grid-template-columns: 1fr; gap: 3rem; }

  .about-visual {
    max-width: 200px;
    margin: 0 auto;
  }
}

@media (max-width: 700px) {
  section { padding: 4.5rem 5%; }

  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(10,15,46,0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    z-index: 999;
    transform: translateX(100%);
    transition: transform 0.35s ease;
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateX(0);
    pointer-events: all;
  }

  .nav-links a { font-size: 1.25rem; }

  .hero h1 { font-size: clamp(2rem, 10vw, 3rem); }
  .hero-scroll { display: none; }

  .projects-grid { grid-template-columns: 1fr; }
  .skills-grid   { grid-template-columns: 1fr 1fr; }

  .back-to-top { bottom: 1.25rem; right: 1.25rem; }
}

@media (max-width: 480px) {
  .skills-grid { grid-template-columns: 1fr; }
}