/* RESET*/

* {
  margin: 0;     /* removes default browser margin from ALL elements */
  padding: 0;    /* removes default browser padding */
  box-sizing: border-box;  /* makes width/height include padding and border */
}

/* THEME VARIABLES*/

:root {
  --bg: #f5f7fb; /* main background color */
  --text: #0f172a; /* main text color */
  --primary: #00e5ff; /* primary highlight color for light mode */
  --accent: #8b5cf6; /* secondary highlight color for some*/
  --card: rgba(255, 255, 255, 0.75); /* card background */
  --border: rgba(15, 23, 42, 0.08); /* subtle border color */
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08); /* default box shadow */

}

.dark {
  --bg: #050505; /* darker page background */
  --text: #f5f5f5; /* light text for dark mode */


  --primary: #ff2d2d; /* red primary highlight */
  --accent: #b91c1c;  /* darker red accent */

  --card: rgba(20, 20, 20, 0.82); /* darker cards */
  --border: rgba(255, 255, 255, 0.06); /* lighter border for dark mode */

  --shadow: 0 12px 30px rgba(0, 0, 0, 0.6); /* stronger shadow */
}

/*GLOBAL*/

html {
  scroll-behavior: smooth; /* extra backup to make anchor links scroll smoothly */
}

body {
  font-family: "Inter", sans-serif; /* sets site font */
  background:
    radial-gradient(circle at top left, rgba(0, 229, 255, 0.08), transparent 30%),
    radial-gradient(circle at top right, rgba(139, 92, 246, 0.08), transparent 35%),
    var(--bg);
  color: var(--text); /* text color from theme variables */
  line-height: 1.6;   /* spacing between lines of text */

  transition: /*transition smoothly*/
    background 0.4s ease,
    color 0.4s ease;
} 

/* dark mode background glow */

body.dark {
  background:
    radial-gradient(circle at top left, rgba(255, 45, 45, 0.18), transparent 35%),
    radial-gradient(circle at top right, rgba(185, 28, 28, 0.18), transparent 40%),
    var(--bg);
}

/* contact links */

.contact-links a {
  text-decoration: none;  /* removes underline */
  color: var(--accent);   /* accent color */
  font-weight: 600;       /* slightly bold */
  transition: 0.2s ease;  /* smooth hover animation */
}

.contact-links a:hover {
  color: var(--primary);    /* changes color on hover */
  text-shadow: 0 0 8px var(--primary);   /* glowing effect */
}

/*TYPOGRAPHY / BASIC ELEMENTS*/

h2 {
  font-size: 2.2rem;
  margin-bottom: 20px;
}

p {
  margin-bottom: 18px;
}

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

ul {
  padding-left: 0;
  margin-left: 0;
  list-style-position: inside;
}

/*LOGO*/

.logo {
  text-decoration: none; /* removes underline */
  color: inherit;   /* uses parent text color */
  font-weight: 800;  /* bold */
  font-size: 1.5rem;
  cursor: pointer;   /* cursor becomes pointer */
}

.logo:hover {
  color: var(--primary);  /* glow highlight on hover */
}

/* PROGRESS BAR*/

.progress-bar {
  position: fixed;  /* stays at top of screen */
  top: 0;
  left: 0;
  height: 4px;   /* thin bar */
  width: 0%;     /* JS increases this as user scrolls */
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 2000;  /* ensures it appears above everything */
}

/*NAVBAR*/

.navbar {
  position: sticky;  /* sticks to top when scrolling */
  top: 0;
  z-index: 1000;

  width: min(1100px, calc(100% - 32px));
  margin: 18px auto 0;
  padding: 16px 24px;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;

  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);

  transition: background 0.3s ease;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  transition: 0.2s ease;
}

.nav-links a:hover {
  color: var(--primary);
  text-shadow: 0 0 8px var(--primary);
}

/*THEME SWITCH*/

.theme-switch {
  position: relative; /* allows child elements to be positioned inside */
  width: 52px;
  height: 28px;
  flex: 0 0 auto;   /* prevents flexbox from stretching or shrinking it */
}

.theme-switch input {
  opacity: 0;  /* makes the checkbox invisible */
  width: 0;   /* removes visual width */
  height: 0;   /* removes visual height */
}

.slider {
  position: absolute;  /* positions relative to .theme-switch */
  inset: 0;    /* shorthand for top:0 right:0 bottom:0 left:0 */
  cursor: pointer;   /* shows pointer cursor when hovering */
  border-radius: 999px;  /* creates pill-shaped switch */
  background: #c7d2fe;
  transition: 0.3s ease;  /* smooth animation when toggled */
}

.slider::before {
  content: "";   /* required for pseudo-element to render */
  position: absolute;
  width: 22px;
  height: 22px;
  left: 3px;
  top: 3px;
  border-radius: 50%;
  background: white;
  transition: 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}
/* when checkbox is checked, change switch background */
.theme-switch input:checked + .slider {
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
/* when checked, move the toggle knob to the right */
.theme-switch input:checked + .slider::before {
  transform: translateX(24px);
}

/* HERO SECTION*/

.hero {
  width: min(1100px, calc(100% - 32px)); /* responsive container width */
  margin: 28px auto 0;   /* center horizontally */
  padding: 72px 56px;   /* inner spacing */

  display: grid;  /* uses CSS grid layout */
  grid-template-columns: 1.15fr 0.85fr;  /* text column wider than image */
  align-items: center;  /* vertically centers content */
  gap: 48px;  /* space between columns */

  background: linear-gradient(
      135deg,
      rgba(0, 229, 255, 0.08),
      rgba(139, 92, 246, 0.08)
    ),
    var(--card);  /* gradient overlay + card background */

  border: 1px solid var(--border);  /* subtle border */
  border-radius: 28px;             /* rounded container */
  box-shadow: var(--shadow);       /* soft drop shadow */

  transition: background 0.4s ease;  /* smooth background change for dark mode */
}

body.dark .hero {
  background: linear-gradient(
      135deg,
      rgba(255, 45, 45, 0.08),
      rgba(185, 28, 28, 0.08)
    ),
    var(--card);
}

.hero-text h1 {
  font-size: clamp(3rem, 7vw, 5rem);  /* responsive heading size */
  line-height: 0.95;      /* tighter line spacing */
  margin-bottom: 24px;    /* space below heading */
  font-weight: 800;  /* very bold */
  letter-spacing: -0.04em;  /* tighter letters for modern look */
}

.hero-text p {
  font-size: 1.3rem;   /* larger intro text */
  max-width: 650px;    /* limits width for readability */
  margin-bottom: 32px;    /* space below paragraph */
}

.hero-image {
  display: flex;    /* flexbox for centering */
  justify-content: center; /* horizontal center */
  align-items: center; /* vertical center */
}

.hero-image img {
  width: 380px;
  height: auto;
  border-radius: 28px;  /* rounded image corners */
  border: 1px solid var(--border);  
  display: block;

  box-shadow:
    0 0 24px var(--primary),       /* glowing effect */
    0 16px 40px rgba(0,0,0,0.4);   /* deep shadow */
}

/* SECTIONS*/

.section {
  width: min(1100px, calc(100% - 32px));  /* responsive container width */
  margin: 28px auto 0;
  padding: 56px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);

  opacity: 0;                   /* initially hidden */
  transform: translateY(30px);   /* slightly lowered */
  transition:
    opacity 0.6s ease,
    transform 0.6s ease,
    background 0.4s ease;
}
/* triggered when JS adds "revealed" class */
.section.revealed {
  opacity: 1;
  transform: translateY(0);
}
/* performance optimization */
.section {
  will-change: transform, opacity;
}

/*PROJECTS*/

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr)); /* 2 equal columns */
  gap: 28px;                                        /* spacing between cards */

}

.project-card {
  background: rgba(255, 255, 255, 0.35);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;

  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease;
}

body.dark .project-card {
  background: rgba(255, 255, 255, 0.02);
}

.project-card:hover {
  transform: translateY(-6px);  /* lifts card upward */
  border-color: var(--primary);

  box-shadow:
    0 0 18px var(--primary),                /* glow */
    0 18px 35px rgba(15, 23, 42, 0.14);
}

.project-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;   /* prevents image distortion */
  border-radius: 14px;
  margin-bottom: 16px;
}

.project-card h3 {
  font-size: 1.9rem;
  margin-bottom: 10px;
}

/*HOBBIES*/

.hobby-list {
  padding-left: 20px;  /* spacing for bullet list */
}

.hobby-list li {
  margin-bottom: 10px;   /* space between list items */
}

.hobbies-layout {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
}

.hobby-images {
  display: flex;
  flex-direction: row;
  gap: 20px;
}

.hobby-images img {
  width: 220px;
  max-width: 100%;
  height: auto;
  border-radius: 16px;
  box-shadow: var(--shadow);
}

/*ABOUT PAGE IMAGES*/

.about-images {
  display: flex;
  gap: 20px;
  margin-top: 20px;
  flex-wrap: wrap;   /* wraps images on smaller screens */
}

.about-images img {
  width: 300px;
  border-radius: 18px;
  box-shadow: var(--shadow);
}

/*FORM*/

form {
  max-width: 620px;
}

form label {
  display: block;  /* makes each label appear on its own line */
  margin: 16px 0 8px;  /* adds space above and below the label */
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.45);
  color: var(--text);
  font: inherit;
}

body.dark input,
body.dark textarea {
  background: rgba(255, 255, 255, 0.03);
}

input:focus,
textarea:focus {
  outline: none; /* removes default browser outline */
  border-color: var(--primary);    /* changes border color to highlight color */
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12);  /* glow ring around input */
}

/*BUTTONS*/

.primary-btn,
form button {
  display: inline-flex;    /* allows flexbox alignment inside the button */
  align-items: center;
  justify-content: center;

  padding: 14px 26px;
  border: none;
  border-radius: 14px;  /* rounded button corners */
  cursor: pointer;

  font: inherit;    /* Uses the page font */
  font-weight: 700;

  color: #03131b;   /* dark text color */

  background: linear-gradient(90deg, var(--primary), #53f4ff);

  box-shadow: 0 0 18px rgba(0, 229, 255, 0.28);

  transition:
    transform 0.2s ease,  /* smooth movement animation */
    box-shadow 0.2s ease,   /* smooth shadow animation */
    filter 0.2s ease;      /* smooth brightness change */
}

.primary-btn:hover,
form button:hover {
  transform: translateY(-2px);   /* slightly lifts button upward */
  filter: brightness(1.03);      /* makes button slightly brighter */

  box-shadow:
    0 0 14px var(--primary),
    0 0 28px var(--accent);
      /* stronger glow on hover */

}

.dark .primary-btn,
.dark form button {

  background: linear-gradient(90deg, #ff2d2d, #b91c1c);
    /* red gradient background for dark mode */

  color: white;
    /* white text for better contrast */


  box-shadow:
    0 0 10px rgba(255,45,45,0.5),
    0 0 20px rgba(185,28,28,0.4);
    /* red glow */
}

.dark .primary-btn:hover,
.dark form button:hover {

  transform: translateY(-2px);

  box-shadow:
    0 0 16px rgba(255,45,45,0.8),
    0 0 32px rgba(185,28,28,0.6);
}

form button {
  margin-top: 18px;
}

/*FOOTER*/

footer {
  width: min(1100px, calc(100% - 32px));
  margin: 28px auto 32px;
  padding: 28px;
  text-align: center;

  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

/*RESPONSIVE DESIGN*/

/* these styles apply when the screen is smaller than 900px */

@media (max-width: 900px) {
      /* navbar adjusts for smaller screens */

  .navbar {
    padding: 16px 18px;
    flex-wrap: wrap;
  }
      /* hero section becomes single column */

  .hero {
    grid-template-columns: 1fr;
    padding: 44px 24px;
    text-align: center;
  }
    /* centers hero paragraph text */

  .hero-text p {
    margin-left: auto;
    margin-right: auto;
  }
    /* projects switch from 2 columns to 1 column */

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

  /* reduces padding for sections and footer */

  .section,
  footer {
    padding: 32px 24px;
  }

}