/* =====================================================
   STICKY NAVBAR PROJECT - style.css
   
   FILE STRUCTURE:
   1. CSS Variables (Colors & Fonts)
   2. Reset & Base Styles
   3. Navbar - Normal State
   4. Navbar - Sticky State (JS se add hogi)
   5. Nav Links
   6. Hamburger (Mobile Menu)
   7. Sections (Page Content)
   8. Cards (Skills Section)
   9. Buttons
   10. Responsive (Mobile View)
===================================================== */

/* 1. CSS VARIABLES  */
:root {
  --primary-color: #6c63ff;
  --dark-color: #1a1a2e;
  --light-bg: #f4f3ff;
  --white: #ffffff;
  --text-color: #444;
  --shadow: 0 4px 20px rgba(108, 99, 255, 0.2);
  --font: "Poppins", sans-serif;
  --navbar-height: 70px;
  --transition: all 0.3s ease;
}

/* 2. RESET & BASE STYLES  */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Smooth scrolling   */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--text-color);
  background: var(--white);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* 3. NAVBAR - NORMAL STATE  */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%; /* Full width */
  height: var(--navbar-height); /* 70px height */
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 60px;
  background: transparent;
  transition: var(--transition);
  z-index: 1000;
}

/* =====================================================
   4. NAVBAR - STICKY STATE
   Jab JS "sticky" class add kare, ye styles apply hongi
   
   HOW IT WORKS:
   - User jab scroll karta hai
   - JS detect karta hai scroll position
   - Agar scroll > 80px, tab "sticky" class add hoti hai
   - Yahan wali styles override ho jaati hain
===================================================== */
.navbar.sticky {
  background: var(--white);
  box-shadow: var(--shadow);
  height: 65px;
}

/* 5. LOGO  */
.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  letter-spacing: -0.5px;
  cursor: default;
}

/* 6. NAV LINKS  */
.nav-links {
  display: flex;
  gap: 35px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--dark-color);
  padding: 5px 0;
  position: relative; /* ::after pseudo-element ke liye */
  transition: var(--transition);
}

/* Underline animation on hover - 
   pehle width: 0, hover pe width: 100% */
.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0; /* Initially koi underline nahi */
  height: 2px;
  background: var(--primary-color);
  transition: width 0.3s ease; /* Smooth width change */
}

/* Hover karo toh underline dikhao */
.nav-links a:hover::after {
  width: 100%; /* Full underline */
}

.nav-links a:hover {
  color: var(--primary-color);
}

/* Transparent navbar mein links white dikhein */
.navbar:not(.sticky) .nav-links a {
  color: white;
}

.navbar:not(.sticky) .logo {
  color: white;
}

/* 7. HAMBURGER BUTTON (Mobile Menu)  */
.hamburger {
  display: none; /* Desktop pe hide */
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

/* Hamburger ki teen lines */
.hamburger span {
  display: block;
  width: 25px;
  height: 2.5px;
  background: var(--dark-color);
  border-radius: 3px;
  transition: var(--transition); /* Animation ke liye */
}

/* Transparent navbar mein hamburger white */
.navbar:not(.sticky) .hamburger span {
  background: white;
}

/* =====================================================
   HAMBURGER ANIMATION - Jab menu open ho
   "active" class JS add karega
   Teen lines X shape mein convert hoti hain
===================================================== */

/* Pehli line - upar rotate */
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

/* Beech wali line - gayab ho jaati hai */
.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

/* Teesri line - neeche rotate */
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 8. PAGE SECTIONS  */
.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.section-content {
  max-width: 800px; /* Zyada wide nahi hoga */
  padding: 40px 20px;
  text-align: center;
}

.section-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem); /* Responsive font size */
  font-weight: 700;
  color: var(--dark-color);
  margin-bottom: 20px;
  line-height: 1.2;
}

.section-content h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--dark-color);
  margin-bottom: 20px;
}

.section-content p {
  font-size: 1.1rem;
  margin-bottom: 15px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Highlighted text */
.highlight {
  color: var(--primary-color);
  position: relative;
}

/* =====================================================
   INDIVIDUAL SECTION BACKGROUNDS
===================================================== */

/* HOME - Beautiful gradient background */
.section-home {
  background: linear-gradient(135deg, #6c63ff 0%, #a855f7 100%);
  color: white;
}

/* Home section text white hona chahiye */
.section-home h1,
.section-home p {
  color: white;
}

.section-home .highlight {
  color: #ffd700; /* Gold color for contrast */
}

/* ABOUT - Light background */
.section-about {
  background: var(--light-bg);
}

/* SKILLS - White background */
.section-skills {
  background: var(--white);
}

/* CONTACT - Dark background */
.section-contact {
  background: var(--dark-color);
  color: white;
}

.section-contact h2,
.section-contact p {
  color: white;
}

/* 9. SKILL CARDS  */
.cards {
  display: flex;
  gap: 25px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 30px;
}

.card {
  background: white;
  border: 2px solid #eee;
  border-radius: 16px;
  padding: 35px 30px;
  width: 180px;
  /* Hover animation ke liye */
  transition: var(--transition);
  cursor: default;
}

.card:hover {
  transform: translateY(-8px); /* 8px upar */
  box-shadow: var(--shadow);
  border-color: var(--primary-color);
}

.card-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 1.1rem;
  color: var(--dark-color);
  margin-bottom: 8px;
}

.card p {
  font-size: 0.85rem;
  color: #777;
  margin: 0;
}

/* 10. BUTTONS  */
.btn {
  display: inline-block;
  padding: 14px 35px;
  background: white;
  color: var(--primary-color);
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  margin-top: 25px;
  /* Hover animation ke liye */
  transition: var(--transition);
  border: 2px solid white;
}

.btn:hover {
  background: transparent;
  color: white;
  transform: translateY(-3px); /* Hover pe thoda utha */
}

/* Dark button - Contact section ke liye */
.btn-dark {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.btn-dark:hover {
  background: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

/* 11. RESPONSIVE DESIGN (Mobile View)  */
@media (max-width: 768px) {
  /* Navbar padding kam karo mobile pe */
  .navbar {
    padding: 0 25px;
  }

  /* Nav links - mobile pe hide initially */
  .nav-links {
    /* Fixed position - poore screen pe overlay */
    position: fixed;
    top: 0;
    right: -100%; /* Screen se bahar (right side) */
    width: 70%;
    height: 100vh; /* Full height */
    background: white;
    flex-direction: column; /* Vertical mein */
    align-items: center;
    justify-content: center;
    gap: 40px;
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.1);

    /* Smooth slide animation */
    transition: right 0.4s ease;
    z-index: 999;
  }

  /* Nav links ke andar links bade dikhein mobile pe */
  .nav-links a {
    font-size: 1.2rem;
    color: var(--dark-color) !important; /* Always dark */
  }

  /* "open" class JS add karega jab menu open ho */
  .nav-links.open {
    right: 0; /* Screen pe aa jaao */
  }

  /* Hamburger button dikhao mobile pe */
  .hamburger {
    display: flex;
    z-index: 1001; /* Nav links ke upar */
  }

  /* Cards mobile pe stack ho jaayein */
  .cards {
    flex-direction: column;
    align-items: center;
  }

  .card {
    width: 100%;
    max-width: 280px;
  }
}