/* ============================================
   PRIYADHARSHAN S — PORTFOLIO
   style.css
   ============================================ */

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

:root {
  --green:       #3DDC84;
  --green-dim:   #2ab56a;
  --green-muted: rgba(61, 220, 132, 0.12);
  --mono:        'JetBrains Mono', 'Fira Code', monospace;
  --sans:        'Inter', system-ui, sans-serif;
  --serif:       'Fraunces', Georgia, serif;
  --radius:      10px;
  --radius-lg:   16px;
  --transition:  0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── THEMES ── */
[data-theme="dark"] {
  --bg:        #0D0F12;
  --bg-raised: #13161A;
  --bg-card:   #181C21;
  --bg-muted:  #1E2228;
  --line:      rgba(255, 255, 255, 0.07);
  --text:      #E8EAF0;
  --text-2:    #8B909E;
  --text-3:    #555A66;
  --nav-bg:    rgba(13, 15, 18, 0.82);
  --shadow:    0 8px 32px rgba(0, 0, 0, 0.45);
}

[data-theme="light"] {
  --bg:          #F0EBE1;
  --bg-raised:   #F0EBE1;
  --bg-card:     #F0EBE1;
  --bg-muted:    #E4DDD3;
  --line:        rgba(50, 35, 15, 0.13);
  --text:        #1A1710;
  --text-2:      #5A5040;
  --text-3:      #A89880;
  --nav-bg:      rgba(240, 235, 225, 0.88);
  --shadow:      none;

  --green:       #1A6E45;
  --green-dim:   #145535;
  --green-muted: rgba(26, 110, 69, 0.08);
}

/* ── LIGHT MODE OVERRIDES ── */
[data-theme="light"] .hero-glow {
  background: radial-gradient(circle, rgba(26, 110, 69, 0.06) 0%, transparent 70%);
}

/* warm sections: hero base, experience, certifications */
[data-theme="light"] #experience,
[data-theme="light"] #certifications { background: #F0EBE1; }

/* green sections: skills, projects, contact */
[data-theme="light"] #skills,
[data-theme="light"] #projects,
[data-theme="light"] #contact { background: #1A6E45; }

/* green section text overrides (skills, projects, contact) */
[data-theme="light"] #skills .section-label,
[data-theme="light"] #projects .section-label,
[data-theme="light"] #contact .section-label         { color: rgba(255,255,255,0.55); }

[data-theme="light"] #skills .section-label::before,
[data-theme="light"] #projects .section-label::before,
[data-theme="light"] #contact .section-label::before { color: rgba(255,255,255,0.25); }

[data-theme="light"] #skills h2,
[data-theme="light"] #projects h2,
[data-theme="light"] #contact h2                     { color: #FFFFFF; }

[data-theme="light"] #skills h2 em,
[data-theme="light"] #projects h2 em,
[data-theme="light"] #contact h2 em                  { color: #1A1710; }

/* skill cards on green bg */
[data-theme="light"] .skill-card                     { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.14); }
[data-theme="light"] .skill-card:hover               { background: rgba(255,255,255,0.16); border-color: rgba(255,255,255,0.32); }
[data-theme="light"] .skill-card::after              { display: none; }
[data-theme="light"] .skill-label                    { color: rgba(255,255,255,0.40); }
[data-theme="light"] .skill-card h3                  { color: #FFFFFF; }
[data-theme="light"] .skill-card p                   { color: rgba(255,255,255,0.68); }
[data-theme="light"] .tag                            { background: rgba(255,255,255,0.10); color: rgba(255,255,255,0.85); border-color: rgba(255,255,255,0.18); }

/* project cards on green bg */
[data-theme="light"] .project-card                   { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.14); }
[data-theme="light"] .project-card:hover             { background: rgba(255,255,255,0.16); border-color: rgba(255,255,255,0.32); }
[data-theme="light"] .project-num                    { color: rgba(255,255,255,0.30); }
[data-theme="light"] .project-card h3                { color: #FFFFFF; }
[data-theme="light"] .project-card p                 { color: rgba(255,255,255,0.68); }
[data-theme="light"] .project-tech span              { background: rgba(255,255,255,0.10); color: rgba(255,255,255,0.72); border-color: rgba(255,255,255,0.16); }

/* contact on green bg */
[data-theme="light"] .contact-desc                   { color: rgba(255,255,255,0.70); }
[data-theme="light"] .contact-sub                    { color: rgba(255,255,255,0.35); }
[data-theme="light"] .contact-link                   { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.14); color: rgba(255,255,255,0.85); }
[data-theme="light"] .contact-link:hover             { background: rgba(255,255,255,0.16); border-color: rgba(255,255,255,0.32); color: #FFFFFF; }
[data-theme="light"] .cl-icon                        { background: rgba(255,255,255,0.12); }

/* warm section card hovers */
[data-theme="light"] .cert-card:hover                { background: #E4DDD3; border-color: rgba(26,110,69,0.3); }

/* timeline dot: subtle ring instead of glow */
[data-theme="light"] .timeline-dot {
  box-shadow: 0 0 0 3px #F0EBE1, 0 0 0 4px rgba(26,110,69,0.25);
}

/* tag border */
[data-theme="light"] .tag { border-color: rgba(26,110,69,0.20); }

/* ── BASE ── */
html { scroll-behavior: smooth; }

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

/* ── LAYOUT ── */
section    { padding: 6rem 5vw; }
.container { max-width: 980px; margin: 0 auto; }

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5vw;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  transition: background var(--transition);
}

.nav-logo {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--green);
  letter-spacing: 0.02em;
  cursor: pointer;
  text-decoration: none;
}
.nav-logo .prompt { color: var(--text-3); }

.nav-right { display: flex; align-items: center; gap: 2rem; }

nav ul            { list-style: none; display: flex; gap: 1.75rem; }
nav ul li a       { text-decoration: none; font-size: 0.8rem; font-weight: 500; color: var(--text-2); letter-spacing: 0.04em; text-transform: uppercase; transition: color var(--transition); }
nav ul li a:hover { color: var(--green); }

/* ── THEME TOGGLE ── */
.theme-btn {
  background: var(--bg-muted);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-2);
  transition: all var(--transition);
}
.theme-btn:hover           { border-color: var(--green); color: var(--green); }
.theme-btn .icon           { font-size: 0.85rem; transition: transform 0.4s; }
.theme-btn:hover .icon     { transform: rotate(20deg); }

/* ── SECTION LABELS & HEADINGS ── */
.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.section-label::before { content: '#'; color: var(--text-3); }

h2 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
}
h2 em { font-style: italic; color: var(--green); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  letter-spacing: 0.01em;
}
.btn-primary             { background: var(--green); color: #0D0F12; border: none; }
.btn-primary:hover       { background: #5fe89a; transform: translateY(-2px); }
.btn-ghost               { background: transparent; color: var(--text-2); border: 1px solid var(--line); }
.btn-ghost:hover         { border-color: var(--green); color: var(--green); transform: translateY(-2px); }
.btn-mono                { font-family: var(--mono); font-size: 0.78rem; }

/* ── TAGS ── */
.tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  background: var(--green-muted);
  color: var(--green);
  font-weight: 500;
  border: 1px solid rgba(61, 220, 132, 0.2);
}

/* ── HERO ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 0%, transparent 80%);
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  right: 5vw; top: 40%;
  transform: translateY(-50%);
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 220, 132, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 980px;
  margin: 0 auto;
  width: 100%;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--green);
  margin-bottom: 1.25rem;
  opacity: 0;
  animation: fadeUp 0.6s 0.1s forwards;
}
.eyebrow::before { content: '//'; color: var(--text-3); }

h1 {
  font-family: var(--serif);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.7s 0.25s forwards;
}
h1 em { font-style: italic; color: var(--green); font-weight: 300; }

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 540px;
  line-height: 1.85;
  margin-bottom: 2.5rem;
  font-weight: 300;
  opacity: 0;
  animation: fadeUp 0.7s 0.4s forwards;
}

.hero-cta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.7s 0.55s forwards;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  opacity: 0;
  animation: fadeUp 0.7s 0.7s forwards;
}
.stat-num   { font-family: var(--mono); font-size: 1.6rem; color: var(--green); line-height: 1; font-weight: 500; }
.stat-label { font-size: 0.72rem; color: var(--text-3); letter-spacing: 0.06em; text-transform: uppercase; margin-top: 0.3rem; font-family: var(--mono); }

/* ── SKILLS ── */
#skills { background: var(--bg-raised); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.skill-card {
  padding: 1.75rem;
  background: var(--bg-card);
  transition: background var(--transition);
  position: relative;
}
.skill-card:hover        { background: var(--bg-muted); }
.skill-card::after       { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--green); transform: scaleX(0); transform-origin: left; transition: transform var(--transition); }
.skill-card:hover::after { transform: scaleX(1); }

.skill-label { font-family: var(--mono); font-size: 0.68rem; color: var(--text-3); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 0.75rem; }
.skill-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text); }
.skill-card p  { font-size: 0.83rem; color: var(--text-2); line-height: 1.6; }

.skill-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 1rem; }

/* ── EXPERIENCE ── */
#experience { background: var(--bg); }

.timeline { position: relative; }
.timeline::before { content: ''; position: absolute; left: 0; top: 0.5rem; bottom: 0; width: 1px; background: var(--line); }

.timeline-item               { padding-left: 2.25rem; padding-bottom: 3rem; position: relative; }
.timeline-item:last-child    { padding-bottom: 0; }
.timeline-dot                { position: absolute; left: -4px; top: 0.5rem; width: 9px; height: 9px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px rgba(61, 220, 132, 0.5); }

.timeline-date    { font-family: var(--mono); font-size: 0.72rem; color: var(--text-3); letter-spacing: 0.05em; margin-bottom: 0.4rem; }
.timeline-title   { font-size: 1.05rem; font-weight: 600; margin-bottom: 0.2rem; color: var(--text); }
.timeline-company { font-family: var(--mono); font-size: 0.78rem; color: var(--green); margin-bottom: 1rem; opacity: 0.85; }

.timeline-items    { list-style: none; display: flex; flex-direction: column; gap: 0.45rem; }
.timeline-items li { font-size: 0.88rem; color: var(--text-2); padding-left: 1.25rem; position: relative; line-height: 1.65; }
.timeline-items li::before { content: '▸'; position: absolute; left: 0; color: var(--green); font-size: 0.65rem; top: 0.22rem; }

/* ── PROJECTS ── */
#projects { background: var(--bg-raised); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.project-card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card:hover { border-color: rgba(61, 220, 132, 0.35); transform: translateY(-4px); box-shadow: var(--shadow); }

.project-num  { font-family: var(--mono); font-size: 0.7rem; color: var(--text-3); letter-spacing: 0.08em; margin-bottom: 0.75rem; }
.project-card h3 { font-size: 0.98rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text); }
.project-card p  { font-size: 0.83rem; color: var(--text-2); line-height: 1.7; }

.project-tech      { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 1rem; }
.project-tech span { font-family: var(--mono); font-size: 0.67rem; padding: 0.18rem 0.5rem; border-radius: 4px; background: var(--bg-muted); color: var(--text-2); border: 1px solid var(--line); }

/* ── CERTIFICATIONS ── */
#certifications { background: var(--bg); }

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.cert-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  max-width: 560px;
  transition: border-color var(--transition), transform var(--transition);
}
.cert-card:hover { border-color: rgba(61, 220, 132, 0.4); transform: translateY(-3px); }

.cert-badge-icon {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
}

.cert-badge-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.cert-info h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.3rem; color: var(--text); }
.cert-info p  { font-size: 0.82rem; color: var(--text-2); line-height: 1.5; }
.cert-pill    { display: inline-block; margin-top: 0.5rem; font-family: var(--mono); font-size: 0.67rem; padding: 0.2rem 0.6rem; border-radius: 4px; background: var(--green-muted); color: var(--green); border: 1px solid rgba(61, 220, 132, 0.25); letter-spacing: 0.04em; }

/* ── CONTACT ── */
#contact { background: var(--bg-raised); }

.contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }

.contact-desc { font-size: 1rem; color: var(--text-2); line-height: 1.85; font-weight: 300; margin-bottom: 0.8rem; }
.contact-sub  { font-family: var(--mono); font-size: 0.75rem; color: var(--text-3); }

.contact-links { display: flex; flex-direction: column; gap: 0.75rem; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  text-decoration: none;
  color: var(--text);
  font-size: 0.85rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  transition: all var(--transition);
}
.contact-link:hover { border-color: var(--green); color: var(--green); transform: translateX(5px); }

.cl-icon { width: 30px; height: 30px; background: var(--bg-muted); border-radius: 6px; display: flex; align-items: center; justify-content: center; font-size: 0.85rem; flex-shrink: 0; }
.cl-text { font-family: var(--mono); font-size: 0.77rem; }

/* ── FOOTER ── */
footer {
  text-align: center;
  padding: 1.75rem 5vw;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-3);
}
footer span { color: var(--green); }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reveal         { opacity: 0; transform: translateY(20px); transition: opacity 0.55s, transform 0.55s; }
.reveal.visible { opacity: 1; transform: none; }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {

  nav {
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .nav-logo {
    font-size: 0.75rem;
  }

  .nav-right {
    width: 100%;
    justify-content: right;
    gap: 1.5rem;
  }

  nav ul {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  nav ul li a {
    font-size: 0.7rem;
  }

  .theme-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.65rem;
  }

  .contact-inner {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    gap: 1.5rem;
    flex-wrap: wrap;
  }

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