/* ========================================================
   SENTHIL KUMAR K — PORTFOLIO STYLES
   ======================================================== */

:root{
  --navy: #0b1f3f;
  --navy-deep: #081833;
  --blue: #1d5fd6;
  --blue-light: #2e7ff0;
  --gold: #e8a63b;
  --gold-dark: #d4941f;
  --bg: #f5f7fb;
  --card-bg: #ffffff;
  --text: #1c2530;
  --text-muted: #5c6b7a;
  --border: #e6eaf0;
  --shadow: 0 4px 18px rgba(11,31,63,0.08);
  --radius: 14px;
  --font-display: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  --transition: 0.25s ease;
}

[data-theme="dark"]{
  --navy: #0b1f3f;
  --navy-deep: #060f22;
  --bg: #0e1626;
  --card-bg: #16203a;
  --text: #eaf0fb;
  --text-muted: #9fb0c8;
  --border: #263252;
  --shadow: 0 4px 18px rgba(0,0,0,0.35);
}

*{ margin:0; padding:0; box-sizing:border-box; }

html{ scroll-behavior: smooth; }

body{
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  transition: background var(--transition), color var(--transition);
}

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

/* ===== NAVBAR ===== */
.navbar{
  position: sticky;
  top:0;
  z-index: 1000;
  background: var(--navy);
  box-shadow: var(--shadow);
}
.nav-inner{
  max-width: 1280px;
  margin: 0 auto;
  display:flex;
  align-items:center;
  justify-content: space-between;
  padding: 14px 32px;
  gap: 24px;
}
.brand{ display:flex; flex-direction:column; color:#fff; }
.brand-name{ font-family: var(--font-display); font-weight:700; font-size: 1.05rem; letter-spacing:0.5px; }
.brand-tag{ font-size: 0.72rem; color:#b9c6de; }

.nav-links{ display:flex; align-items:center; gap: 26px; flex-wrap:wrap; }
.nav-link{
  display:flex; align-items:center; gap:6px;
  color:#cfd9ea; font-size:0.9rem; font-weight:500;
  padding: 6px 2px; border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  white-space:nowrap;
}
.nav-link .nav-ico{ font-size:0.85rem; }
.nav-link:hover, .nav-link.active{ color: var(--gold); border-bottom-color: var(--gold); }

.nav-actions{ display:flex; align-items:center; gap:14px; }
.theme-toggle{
  width:36px; height:36px; border-radius:50%;
  border:1px solid #33456b; background:#132a52; color:#fff;
  display:flex; align-items:center; justify-content:center;
  cursor:pointer; transition: background var(--transition);
}
.theme-toggle:hover{ background:#1b3a6e; }

.hamburger{
  display:none; flex-direction:column; gap:5px;
  background:none; border:none; cursor:pointer; padding:6px;
}
.hamburger span{ width:24px; height:2px; background:#fff; border-radius:2px; }

/* ===== HERO ===== */
.hero{
  background: linear-gradient(120deg, var(--bg) 55%, #e9edf6 100%);
  overflow:hidden;
}
[data-theme="dark"] .hero{
  background: linear-gradient(120deg, var(--bg) 55%, #101b32 100%);
}
.hero-inner{
  max-width: 1280px; margin:0 auto;
  display:grid; grid-template-columns: 1.1fr 0.9fr;
  align-items:center; gap: 40px;
  padding: 70px 32px;
}
.eyebrow{ color: var(--blue-light); font-weight:600; margin-bottom:8px; }
.hero-text h1{
  font-family: var(--font-display);
  font-size: 3.4rem; font-weight:800;
  color: var(--text); line-height:1.1; margin-bottom: 14px;
}
.role-line{ font-family: var(--font-display); font-weight:600; font-size:1.35rem; color: var(--blue-light); }
.role-2{ margin-bottom: 16px; }
.rule{ width:70px; height:4px; background: var(--gold); border-radius: 4px; margin: 18px 0; }
.hero-sub{ color: var(--text-muted); font-size:0.98rem; margin-bottom:4px; }
.hero-actions{ display:flex; gap:16px; margin-top: 30px; flex-wrap:wrap; }

.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding: 13px 26px; border-radius: 8px;
  font-weight:600; font-size:0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  border:none; cursor:pointer;
}
.btn:hover{ transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.15); }
.btn-primary{ background: var(--navy); color:#fff; }
.btn-accent{ background: var(--gold); color: var(--navy-deep); }
.btn-dark{ background: var(--navy); color:#fff; }

.hero-photo{ display:flex; justify-content:center; }
.photo-frame{
  width: 340px; height: 400px; border-radius: 18px;
  overflow:hidden; box-shadow: var(--shadow);
  background: linear-gradient(160deg, var(--navy), var(--blue));
}
.photo-placeholder{
  width:100%; height:100%;
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-display); font-weight:800;
  font-size: 6rem; color: rgba(255,255,255,0.85);
  letter-spacing: 2px;
}
.profile-img{
  width:100%;
  height:100%;
  object-fit: cover;
}

/* ===== SECTIONS ===== */
.section{
  max-width: 1280px; margin: 0 auto;
  padding: 60px 32px;
}
.section-title{
  display:flex; align-items:center; gap:14px;
  font-family: var(--font-display); font-size:1.6rem; font-weight:700;
  margin-bottom: 28px; color: var(--text);
}
.title-icon{
  width:42px; height:42px; border-radius:50%;
  background: var(--navy); color:#fff;
  display:flex; align-items:center; justify-content:center;
  font-size:1.1rem; flex-shrink:0;
}
.about-text{ color: var(--text-muted); line-height:1.8; max-width: 900px; font-size:1.02rem; }

/* Experience */
.exp-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.exp-card{
  background: var(--card-bg); border:1px solid var(--border);
  border-radius: var(--radius); padding: 26px 28px; box-shadow: var(--shadow);
  transition: transform var(--transition);
}
.exp-card:hover{ transform: translateY(-4px); }
.exp-role{ color: var(--blue-light); font-family: var(--font-display); font-size:1.15rem; margin-bottom:4px; }
.exp-company{ font-weight:600; margin-bottom:6px; }
.exp-date{ color: var(--text-muted); font-size:0.85rem; margin-bottom:14px; }
.exp-card ul{ display:flex; flex-direction:column; gap:8px; }
.exp-card li{
  position:relative; padding-left:18px; color: var(--text-muted); font-size:0.92rem; line-height:1.5;
}
.exp-card li::before{
  content:""; position:absolute; left:0; top:8px;
  width:6px; height:6px; border-radius:50%; background: var(--gold);
}

/* Skills */
.skills-grid{ display:grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.skill-col h4{ color: var(--blue-light); font-family: var(--font-display); font-size:1rem; margin-bottom:14px; }
.skill-col ul{ display:flex; flex-direction:column; gap:9px; border-left:2px solid var(--border); padding-left:16px; }
.skill-col li{ font-size:0.9rem; color: var(--text-muted); }

/* SAP FICO */
.fico-grid{ display:grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 18px; }
.fico-card{
  background: var(--card-bg); border:1px solid var(--border);
  border-radius: var(--radius); padding: 24px 16px; text-align:center;
  box-shadow: var(--shadow); transition: transform var(--transition), border-color var(--transition);
}
.fico-card:hover{ transform: translateY(-4px); border-color: var(--gold); }
.fico-ico{ font-size:1.8rem; display:block; margin-bottom:10px; }
.fico-card p{ font-size:0.85rem; font-weight:600; }

/* Education */
.edu-grid{ display:grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); gap: 20px; }
.edu-card{
  display:flex; align-items:center; gap:14px;
  background: var(--card-bg); border:1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
}
.edu-ico{ font-size:1.6rem; }
.edu-card h4{ font-family: var(--font-display); font-size:0.98rem; margin-bottom:2px; }
.edu-card p{ color: var(--text-muted); font-size:0.85rem; }

/* Resume */
.resume-box{
  background: var(--navy); color:#fff;
  border-radius: var(--radius); padding: 30px 34px;
  display:flex; align-items:center; justify-content:space-between; gap: 20px; flex-wrap:wrap;
}
.resume-box p{ max-width: 520px; color:#cfd9ea; }
.resume-box .btn-dark{ background: var(--gold); color: var(--navy-deep); }

/* Contact */
.contact-grid{ display:grid; grid-template-columns: repeat(auto-fit, minmax(290px,1fr)); gap: 20px; }
.contact-item{
  display:flex; align-items:center; gap:14px;
  background: var(--card-bg); border:1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow);
  transition: transform var(--transition), border-color var(--transition);
}
.contact-item:hover{ transform: translateY(-4px); border-color: var(--blue-light); }
.contact-ico{
  width:38px; height:38px; border-radius:50%;
  background: var(--navy); color:#fff;
  display:flex; align-items:center; justify-content:center; font-size:0.95rem; flex-shrink:0;
}
.contact-value{ font-weight:600; font-size:0.88rem; white-space: nowrap; }
.contact-label{ color: var(--text-muted); font-size:0.78rem; }

/* Footer */
.footer{
  background: var(--navy-deep); color:#b9c6de;
  text-align:center; padding: 22px; font-size:0.85rem;
  position:relative;
}
.scroll-top{
  position:fixed; bottom:26px; right:26px;
  width:44px; height:44px; border-radius:50%;
  background: var(--gold); color: var(--navy-deep);
  border:none; font-size:1.1rem; cursor:pointer;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25);
  opacity:0; visibility:hidden; transform: translateY(10px);
  transition: all var(--transition);
}
.scroll-top.visible{ opacity:1; visibility:visible; transform:translateY(0); }

/* ===== SCROLL REVEAL ===== */
.reveal{ opacity:0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in-view{ opacity:1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 980px){
  .hero-inner{ grid-template-columns:1fr; text-align:center; }
  .hero-actions{ justify-content:center; }
  .hero-photo{ order:-1; }
  .exp-grid{ grid-template-columns:1fr; }
  .skills-grid{ grid-template-columns: repeat(2,1fr); }
  .nav-links{
    position:absolute; top:100%; left:0; right:0;
    background: var(--navy); flex-direction:column; align-items:flex-start;
    padding: 16px 32px; gap: 14px;
    max-height:0; overflow:hidden; transition: max-height var(--transition);
  }
  .nav-links.open{ max-height: 500px; padding-bottom: 24px; }
  .hamburger{ display:flex; }
}
@media (max-width: 600px){
  .hero-text h1{ font-size:2.4rem; }
  .skills-grid{ grid-template-columns:1fr; }
  .resume-box{ flex-direction:column; text-align:center; }
  .photo-frame{ width:260px; height:300px; }
  .contact-value{ white-space: normal; word-break: break-word; }
}