/* ══════════════════════════════════════════════════════════════
   CUSTOM PROPERTIES
   ══════════════════════════════════════════════════════════════ */
:root {
    --clr-bg: #fafbfc;
    --clr-surface: #ffffff;
    --clr-bg-alt: #f1f5f9;
    --clr-text: #0f172a;
    --clr-text-secondary: #475569;
    --clr-text-muted: #94a3b8;
    --clr-accent: #4f46e5;
    --clr-accent-light: #818cf8;
    --clr-accent-dark: #3730a3;
    --gradient-accent: linear-gradient(135deg, #4f46e5, #7c3aed, #06b6d4);
    --gradient-subtle: linear-gradient(135deg, #eef2ff 0%, #f5f3ff 50%, #ecfeff 100%);
    --border: #e2e8f0;
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.07), 0 4px 10px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.1), 0 8px 20px rgba(0,0,0,0.05);
    --header-height: 72px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

/* ══════════════════════════════════════════════════════════════
   RESET & BASE
   ══════════════════════════════════════════════════════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--clr-bg);
    color: var(--clr-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ══════════════════════════════════════════════════════════════
   REUSABLE CLASSES
   ══════════════════════════════════════════════════════════════ */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 6rem 1.5rem; }
.bg-alt { background: var(--clr-bg-alt); }

.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.85rem 1.75rem; border-radius: 50px;
    font-weight: 600; font-size: 0.95rem; letter-spacing: -0.2px;
    transition: var(--transition); border: none; cursor: pointer;
    font-family: 'Inter', sans-serif;
}
.btn--primary { background: var(--clr-accent); color: #fff; box-shadow: 0 8px 24px rgba(79,70,229,0.35); }
.btn--primary:hover { background: var(--clr-accent-dark); transform: translateY(-2px); box-shadow: 0 12px 30px rgba(79,70,229,0.45); }
.btn--outline { background: var(--clr-surface); color: var(--clr-text); border: 2px solid var(--border); }
.btn--outline:hover { border-color: var(--clr-accent); color: var(--clr-accent); background: rgba(79,70,229,0.03); transform: translateY(-2px); }

.section__title {
    font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 800;
    letter-spacing: -0.8px; text-align: center; margin-bottom: 3.5rem;
    display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
}
.section__label {
    font-size: 0.75rem; font-weight: 700; letter-spacing: 2px;
    text-transform: uppercase; color: var(--clr-accent);
}

.gradient-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Placeholder images */
.placeholder-img {
    width: 100%; height: 100%; display: flex;
    align-items: center; justify-content: center;
    font-size: 3rem; color: var(--clr-accent);
}
.placeholder--hero { background: linear-gradient(135deg, #e0e7ff, #c7d2fe); }
.placeholder--about { background: linear-gradient(160deg, #f0fdf4, #dcfce7); }
.placeholder--ecom { background: linear-gradient(135deg, #ede9fe, #e0e7ff); }
.placeholder--dash { background: linear-gradient(135deg, #fef3c7, #fde68a); color: #d97706; }
.placeholder--inv { background: linear-gradient(135deg, #dbeafe, #bfdbfe); color: #2563eb; }
.placeholder--calc { background: linear-gradient(135deg, #d1fae5, #a7f3d0); color: #059669; }
.placeholder--track { background: linear-gradient(135deg, #ffe4e6, #fecdd3); color: #e11d48; }
.placeholder--web { background: linear-gradient(135deg, #e0e7ff, #c7d2fe); color: #4f46e5; }

/* ══════════════════════════════════════════════════════════════
   HEADER & NAVIGATION
   ══════════════════════════════════════════════════════════════ */
.header {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    height: var(--header-height);
    background: rgba(255,255,255,0.82); backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(226,232,240,0.7);
    transition: var(--transition);
}
.header.scrolled { background: rgba(255,255,255,0.95); box-shadow: var(--shadow-lg); }

.nav { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.nav__logo { font-family: 'Playfair Display', serif; font-size: 1.5rem; font-weight: 700; }
.nav__logo span { color: var(--clr-accent); }

.nav__menu { display: flex; align-items: center; gap: 2rem; }
.nav__list { display: flex; gap: 0.5rem; }
.nav__link {
    padding: 0.5rem 1rem; border-radius: 50px;
    font-weight: 500; font-size: 0.9rem; color: var(--clr-text-secondary);
    transition: var(--transition);
}
.nav__link:hover,
.nav__link.active { color: var(--clr-accent); background: rgba(79,70,229,0.06); }

.nav__cta { margin-left: 1rem; }

.nav__toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 8px;
}
.nav__toggle span {
    width: 26px; height: 2.5px; background: var(--clr-text);
    border-radius: 10px; transition: var(--transition);
}

/* ══════════════════════════════════════════════════════════════
   HERO
   ══════════════════════════════════════════════════════════════ */
.hero {
    min-height: 100vh; display: flex; align-items: center;
    padding: calc(var(--header-height) + 2rem) 1.5rem 3rem;
    position: relative; overflow: hidden;
    background: var(--gradient-subtle);
}
.hero__bg-shape {
    position: absolute; top: -15%; right: -10%;
    width: 550px; height: 550px; border-radius: 50%;
    background: radial-gradient(circle, rgba(79,70,229,0.06) 0%, transparent 70%);
    pointer-events: none;
}
.hero__container { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; position: relative; z-index: 1; }
.hero__content { display: flex; flex-direction: column; gap: 1.5rem; }
.badge {
    display: inline-flex; align-items: center; gap: 0.5rem;
    background: var(--clr-surface); border: 1px solid var(--border);
    padding: 0.5rem 1rem; border-radius: 50px; font-size: 0.85rem;
    font-weight: 500; color: var(--clr-text-secondary); width: fit-content;
    box-shadow: var(--shadow-sm);
}
.hero__title { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 900; letter-spacing: -1.5px; line-height: 1.1; }
.hero__description { font-size: 1.1rem; color: var(--clr-text-secondary); max-width: 480px; }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 0.5rem; }

.hero__image-wrapper { position: relative; display: flex; justify-content: center; }
.hero__image-frame {
    width: 300px; height: 300px; border-radius: var(--radius-xl);
    overflow: hidden; box-shadow: var(--shadow-xl);
    border: 4px solid var(--clr-surface); background: var(--clr-bg-alt);
    position: relative; z-index: 2;
}
.hero__image-frame img { width: 100%; height: 100%; object-fit: cover; }
.hero__decoration {
    position: absolute; width: 260px; height: 260px;
    border-radius: var(--radius-xl); border: 3px dashed var(--clr-accent-light);
    opacity: 0.4; z-index: 1; transform: rotate(-6deg) translate(20px, -20px);
    pointer-events: none;
}

/* ══════════════════════════════════════════════════════════════
   ABOUT
   ══════════════════════════════════════════════════════════════ */
.about__grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 3rem; align-items: center; }
.about__image {
    border-radius: var(--radius-lg); overflow: hidden;
    box-shadow: var(--shadow-lg); aspect-ratio: 4/5;
    background: var(--clr-bg-alt); max-height: 450px;
}
.about__image img { width: 100%; height: 100%; object-fit: cover; }
.about__info h3 { font-size: 1.7rem; font-weight: 700; margin-bottom: 1rem; }
.about__info p { color: var(--clr-text-secondary); margin-bottom: 1.5rem; line-height: 1.7; }

.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.info-card {
    display: flex; align-items: flex-start; gap: 0.75rem;
    padding: 1rem; background: var(--clr-surface); border: 1px solid var(--border);
    border-radius: var(--radius-sm); transition: var(--transition);
}
.info-card:hover { box-shadow: var(--shadow-md); border-color: transparent; transform: translateY(-2px); }
.info-card i { color: var(--clr-accent); font-size: 1.1rem; margin-top: 2px; }
.info-card span { display: block; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1px; color: var(--clr-text-muted); margin-bottom: 2px; }

/* ══════════════════════════════════════════════════════════════
   EDUCATION
   ══════════════════════════════════════════════════════════════ */
.education__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.edu-card {
    background: var(--clr-surface); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 2rem; position: relative;
    transition: var(--transition); overflow: hidden;
}
.edu-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 4px; height: 100%;
    background: var(--gradient-accent); border-radius: 0 4px 4px 0;
}
.edu-card:hover { box-shadow: var(--shadow-lg); border-color: transparent; transform: translateY(-4px); }
.edu-card__year { font-size: 0.75rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--clr-accent); margin-bottom: 0.5rem; }
.edu-card h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.25rem; }
.edu-card p { color: var(--clr-text-secondary); font-size: 0.9rem; margin-bottom: 0.75rem; }
.edu-card__score { display: inline-block; background: var(--gradient-subtle); padding: 0.3rem 0.8rem; border-radius: 50px; font-weight: 600; font-size: 0.85rem; color: var(--clr-accent); }

/* ══════════════════════════════════════════════════════════════
   SKILLS
   ══════════════════════════════════════════════════════════════ */
.skills__cloud { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; }
.skill-chip {
    display: flex; align-items: center; gap: 0.6rem;
    padding: 0.8rem 1.4rem; border-radius: 50px;
    background: var(--clr-surface); border: 1px solid var(--border);
    font-weight: 500; font-size: 0.9rem; transition: var(--transition);
    cursor: default;
}
.skill-chip:hover { border-color: var(--clr-accent-light); background: rgba(79,70,229,0.04); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.skill-chip i { color: var(--clr-accent); font-size: 1.1rem; }

/* ══════════════════════════════════════════════════════════════
   PROJECTS
   ══════════════════════════════════════════════════════════════ */
.projects__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; }
.project-card {
    background: var(--clr-surface); border-radius: var(--radius-lg);
    overflow: hidden; border: 1px solid var(--border);
    transition: var(--transition); display: flex; flex-direction: column;
}
.project-card:hover { box-shadow: var(--shadow-xl); border-color: transparent; transform: translateY(-5px); }
.project-card__image { height: 180px; background: var(--clr-bg-alt); overflow: hidden; }
.project-card__image img { width: 100%; height: 100%; object-fit: cover; }
.project-card__body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; gap: 0.6rem; }
.tag { font-size: 0.7rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--clr-accent); }
.project-card h4 { font-size: 1.1rem; font-weight: 700; }
.project-card p { font-size: 0.9rem; color: var(--clr-text-secondary); line-height: 1.5; }
.project-link {
    display: inline-flex; align-items: center; gap: 0.4rem;
    color: var(--clr-accent); font-weight: 600; font-size: 0.9rem;
    margin-top: auto; transition: gap 0.2s ease;
}
.project-link:hover { gap: 0.7rem; }
.projects__cta { text-align: center; margin-top: 3rem; }

/* ══════════════════════════════════════════════════════════════
   CERTIFICATIONS & HOBBIES
   ══════════════════════════════════════════════════════════════ */
.cert-card {
    display: flex; align-items: center; gap: 1.5rem;
    max-width: 500px; margin: 0 auto;
    background: var(--clr-surface); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 1.5rem 2rem;
    transition: var(--transition);
}
.cert-card:hover { box-shadow: var(--shadow-lg); border-color: transparent; }
.cert-icon {
    width: 56px; height: 56px; border-radius: var(--radius);
    background: var(--gradient-subtle); display: flex;
    align-items: center; justify-content: center;
    font-size: 1.6rem; color: var(--clr-accent);
}
.cert-card h4 { font-weight: 700; }
.cert-card span { font-size: 0.85rem; color: var(--clr-text-muted); }

.hobbies-cloud { display: flex; flex-wrap: wrap; gap: 0.8rem; justify-content: center; }
.hobbies-cloud span {
    padding: 0.7rem 1.4rem; border-radius: 50px;
    background: var(--clr-surface); border: 1px solid var(--border);
    font-weight: 500; transition: var(--transition);
}
.hobbies-cloud span:hover { background: var(--clr-accent); color: #fff; border-color: var(--clr-accent); box-shadow: var(--shadow-md); transform: translateY(-2px); }

/* ══════════════════════════════════════════════════════════════
   CONTACT
   ══════════════════════════════════════════════════════════════ */
.contact { background: var(--clr-text); color: #fff; text-align: center; }
.section__title--light { color: #fff; }
.section__title--light .section__label { color: var(--clr-accent-light); }
.contact__text { color: #cbd5e1; max-width: 500px; margin: 0 auto 2rem; }
.contact__cards { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; }
.contact-card {
    display: flex; align-items: center; gap: 0.75rem;
    background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12);
    padding: 1rem 2rem; border-radius: 50px; transition: var(--transition);
    color: #e2e8f0; font-weight: 500;
}
.contact-card:hover { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.3); color: #fff; transform: translateY(-2px); }
.contact-card i { color: var(--clr-accent-light); font-size: 1.1rem; }

/* ══════════════════════════════════════════════════════════════
   FOOTER & SCROLL TOP
   ══════════════════════════════════════════════════════════════ */
.footer { background: #0a0d14; color: var(--clr-text-muted); text-align: center; padding: 2rem 1.5rem; font-size: 0.9rem; }
.scroll-top {
    position: fixed; bottom: 2rem; right: 2rem;
    background: var(--clr-accent); color: #fff; width: 44px; height: 44px;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s; z-index: 999;
}
.scroll-top.show { opacity: 1; visibility: visible; }

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════════ */
@media (max-width: 968px) {
    .nav__menu {
        position: fixed; top: 0; right: -100%;
        width: 280px; height: 100vh; background: rgba(255,255,255,0.98);
        backdrop-filter: blur(30px); flex-direction: column;
        padding: 6rem 2rem 2rem; gap: 1.5rem;
        transition: right 0.4s ease; box-shadow: var(--shadow-xl);
    }
    .nav__menu.show { right: 0; }
    .nav__list { flex-direction: column; gap: 0.5rem; }
    .nav__toggle { display: flex; z-index: 1001; }
    .nav__cta { margin-left: 0; width: 100%; justify-content: center; }

    .hero__container { grid-template-columns: 1fr; text-align: center; gap: 2rem; }
    .hero__content { align-items: center; }
    .hero__description { max-width: 100%; }
    .hero__image-wrapper { order: -1; }
    .hero__image-frame { width: 220px; height: 220px; }
    .hero__decoration { width: 200px; height: 200px; }

    .about__grid { grid-template-columns: 1fr; text-align: center; }
    .about__image { max-width: 280px; margin: 0 auto; aspect-ratio: 1/1; }
    .info-grid { grid-template-columns: 1fr; }

    .projects__grid { grid-template-columns: 1fr; }
    .section { padding: 4rem 1rem; }
}

@media (max-width: 480px) {
    .hero__title { font-size: 2rem; }
    .hero__image-frame { width: 180px; height: 180px; }
    .hero__decoration { width: 160px; height: 160px; }
    .btn { padding: 0.7rem 1.5rem; font-size: 0.85rem; }
    .info-grid { grid-template-columns: 1fr; }
}

/* ══════════════════════════════════════════════════════════════
   REVEAL ANIMATION (for Intersection Observer)
   ══════════════════════════════════════════════════════════════ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.footer__disclaimer {
    font-size: 0.75rem;
    color: #64748b;
    font-style: italic;
    margin-top: 0.5rem;
    opacity: 0.7;
}