:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;

  --text: #1f2937;
  --text-light: #6b7280;

  --white: #ffffff;

  --bg: #f8fafc;
  --bg-light: #f8fafc;

  --border: #e5e7eb;

  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);

  --header-height: 76px;

  --radius: 14px;

  --transition: 0.25s ease;

  --container: 1280px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", Arial, Helvetica, sans-serif;

  color: var(--text);

  background: var(--bg);

  line-height: 1.7;

  overflow-x: hidden;
}

img {
  display: block;

  max-width: 100%;
}

a {
  color: inherit;

  text-decoration: none;

  transition: var(--transition);
}

ul {
  list-style: none;
}

.container {
  width: min(calc(100% - 40px), var(--container));

  margin: auto;
}

main {
  min-height: 70vh;
}

/* =======================================
   HEADER
======================================= */

.site-header {
  position: sticky;

  top: 0;

  z-index: 1000;

  background: rgba(255, 255, 255, 0.92);

  backdrop-filter: blur(12px);

  border-bottom: 1px solid transparent;

  transition: var(--transition);
  padding-top: 15px;
  pdding-bottom: 15px;
  border-bottom: 2px solid var(--border);
}

.site-header.scrolled {
  border-bottom: 1px solid var(--border);

  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
}

.header-container {
  height: var(--header-height);

  display: flex;

  align-items: center;

  justify-content: space-between;
}

.logo {
  display: flex;

  align-items: center;

  gap: 10px;

  font-size:35px;

  font-weight: 800;
}

.logo img {
  width: 70px;

  height: 70px;

}

.main-nav ul {
  display: flex;

  align-items: center;

  gap: 24px;



}

.main-nav a {
  color: #000;
  font-size:18px;

  font-weight: 500;
  font-weight: 700;
}

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

.main-nav a.active {
  color: var(--primary);

  font-weight: 700;
}

.btn-download {
  display: inline-flex;

  align-items: center;

  justify-content: center;

  padding: 13px 26px;

  background: var(--primary);

  color: #fff !important;

  border-radius: 999px;

  font-weight: 900;
}

.btn-download:hover {
  background: var(--primary-dark);
}

.menu-toggle {
  display: none;

  background: none;

  border: none;

  cursor: pointer;
}

.menu-toggle span {
  display: block;

  width: 26px;

  height: 3px;

  background: #222;

  margin: 5px 0;

  transition: 0.3s;
}



/* =======================================
   FOOTER
======================================= */

.site-footer {
  margin-top: 100px;

  background: #0f172a;

  color: #cbd5e1;
}

.footer-grid {
  display: grid;

  grid-template-columns: 2fr 1fr 1fr 1fr;

  gap: 60px;

  padding: 30px 0;
}

.footer-logo {
  display: flex;

  align-items: center;

  gap: 12px;

  margin-bottom: 20px;

  color: #fff;

  font-size: 1.35rem;

  font-weight: 700;
}

.footer-logo img {
  width: 48px;

  height: 48px;
}

.footer-brand p {
  max-width: 420px;

  color: #94a3b8;
}

.footer-column h4 {
  color: #fff;

  margin-bottom: 20px;

  font-size: 1rem;
}

.footer-column ul {
  display: flex;

  flex-direction: column;

  gap: 12px;
}

.footer-column a {
  color: #94a3b8;
}

.footer-column a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-bottom-content {
  display: flex;

  justify-content: space-between;

  align-items: center;

  gap: 40px;

  padding: 30px 0;
}

.footer-copy p {
  margin-bottom: 8px;
}

.footer-note {
  color: #94a3b8;

  font-size: 0.9rem;

  max-width: 760px;
}

.footer-links {
  display: flex;

  gap: 25px;

  flex-wrap: wrap;
}

.footer-links a {
  color: #cbd5e1;

  font-weight: 500;
}

.footer-links a:hover {
  color: #fff;
}

/* =======================================
   BUTTONS
======================================= */

.btn {
  display: inline-flex;

  align-items: center;

  justify-content: center;

  gap: 10px;

  padding: 14px 28px;

  border-radius: 999px;

  font-weight: 600;

  transition: var(--transition);
}

.btn-primary {
  background: var(--primary);

  color: #fff;
}

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

.btn-outline {
  border: 2px solid var(--primary);

  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);

  color: #fff;
}

/* =======================================
   COMMON SECTIONS
======================================= */

section {
  padding: 40px 0;
}

.section-title {
  font-size: 2.5rem;

  font-weight: 700;

  text-align: center;

  margin-bottom: 18px;
}

.section-subtitle {
  max-width: 760px;

  margin: 0 auto 60px;

  text-align: center;

  color: var(--text-light);

  font-size: 1.1rem;
}

/* =======================================
   CARDS
======================================= */

.card {
  background: #fff;

  border: 1px solid var(--border);

  border-radius: var(--radius);

  box-shadow: var(--shadow);

  padding: 20px;

  transition: var(--transition);
  border-color: black;
}

.card:hover {
  transform: translateY(-6px);

  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.12);
}

/* =======================================
   UTILITIES
======================================= */

.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: 10px;
}
.mt-2 {
  margin-top: 20px;
}
.mt-3 {
  margin-top: 30px;
}
.mt-4 {
  margin-top: 40px;
}
.mt-5 {
  margin-top: 60px;
}

.mb-1 {
  margin-bottom: 10px;
}
.mb-2 {
  margin-bottom: 20px;
}
.mb-3 {
  margin-bottom: 30px;
}
.mb-4 {
  margin-bottom: 40px;
}
.mb-5 {
  margin-bottom: 60px;
}

.py-0 {
  padding-top: 0;
  padding-bottom: 0;
}

/* =======================================
   ANIMATIONS
======================================= */

.fade-in {
  animation: fadeIn 0.8s ease both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(25px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-8px);
  }

  100% {
    transform: translateY(0);
  }
}

.float {
  animation: float 4s ease-in-out infinite;
}

/* =======================================
   SELECTION
======================================= */

::selection {
  background: var(--primary);

  color: #fff;
}

/* =======================================
   SCROLLBAR
======================================= */

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: #f3f4f6;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;

  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

.buymecoffe {
  border: 3px sold red;
  padding: 10px 10px;
  border-radius: 10px;
  background-color: green;
  color: white;
  margin-top: 10px;
  width: 200px;
  weight:700;
  font-size: 20px;
}

.buymecoffe:hover {
  background-color: rgb(255, 238, 0);
  color: black;
  transform:translateY(-3px);
}