/* Basic CSS Resets ********************************/
*,
:after,
:before {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}

ol[class],
ul[class] {
  padding: 0;
  margin: 0;
}

blockquote,
body,
dd,
dl,
fieldset,
figcaption,
figure,
form,
h1,
h2,
h3,
h4,
li,
ol[class],
p,
ul[class] {
  margin: 0;
  padding: 0;
  border: 0;
}

body {
  min-height: 100vh;
  scroll-behavior: smooth;
  text-rendering: optimizeSpeed;
}

ol[class],
ul[class] {
  list-style: none;
}

a:not([class]) {
  text-decoration-skip-ink: auto;
}

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

figure {
  margin: 0;
}

article>*+* {
  margin-top: 1em;
}

button,
input,
select,
textarea {
  font: inherit;
}

input[type="email"],
input[type="search"],
input[type="submit"],
input[type="text"] {
  -webkit-appearance: none;
}

input::-webkit-contacts-auto-fill-button {
  visibility: hidden;
  display: none !important;
  pointer-events: none;
  position: absolute;
  right: 0;
}

::-webkit-input-placeholder {
  /* Edge */
  color: var(--border-color);
}

:-ms-input-placeholder {
  /* Internet Explorer 10-11 */
  color: var(--border-color);
}

::placeholder {
  color: var(--border-color);
}

/* CSS Variables & Theming ********************************/

:root {
  --color-mode: "dark";
  --theme-color: #ff6161;
  --page-bg-color: #12171c;
  --bg-off: #1f2327;
  --border-color: #373c3f;
  --border-color-lighter: #646a6e;
  --text-color: #fff;
  --img-filter: invert(75%) brightness(200%);
  --opacity-img: 0.9;
}

@media (prefers-color-scheme: light) {
  :root {
    --color-mode: "light";
  }

  :root:not([data-user-color-scheme]) {
    --color-mode: "light";
    --page-bg-color: #fff;
    --text-color: #12171c;
    --bg-off: #eee;
    --border-color: #95a0a7;
    --border-color-lighter: #12171c;
    --img-filter: invert(0%);
    --opacity-img: 1;
  }
}

[data-user-color-scheme="light"] {
  --color-mode: "light";
  --page-bg-color: #fff;
  --text-color: #12171c;
  --bg-off: #eee;
  --border-color: #95a0a7;
  --border-color-lighter: #12171c;
  --img-filter: invert(0%);
  --opacity-img: 1;
}


/* Page Core CSS ********************************/
html {
  background-color: var(--page-bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  font-size: 18px;
  text-align: left;
  scroll-behavior: smooth;
  line-height: 1.5;
}

ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: var(--text-color);
}

a.link {
  position: relative;
}

a.link:before {
  content: "";
  position: absolute;
  width: 0;
  height: 1px;
  bottom: 0;
  left: 0;
  background-color: var(--theme-color);
  visibility: hidden;
  transition: all 0.3s ease-in-out;
}

a.link:hover:before {
  visibility: visible;
  width: 100%;
}

.active a:before {
  visibility: visible;
  width: 100%;
}

body {
  transition: all 0.3s ease;
}

body div {
  transition: all 0.3s ease;
}

/* Page Warp & Layout ********************************/
.page-container {
  max-width: 1200px;
  margin: auto;
  padding: 20px;
}

/* Navigation Sidebar  ********************************/
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 15px;
}

.branding h1 {
  margin: 0;
  padding: 0;
}

nav ul {
  display: flex;
  gap: 25px;
  margin-top: 20px;
}

nav .main-nav {
  margin-top: 5px;
}

nav .social-icon {
  margin-top: 5px;
}

nav .social-icon li a img {
  width: 24px;
  filter: var(--img-filter);
}

/* Main Page Side  ********************************/
main {
  margin-top: 100px;
}

main a {
  border-bottom: 1px solid var(--border-color);
}

main a:hover {
  border-bottom: none;
}

.hero {
  text-align: center;
  margin: auto;
}

.hero h2 {
  max-width: 700px;
  font-size: 80px;
  margin: 15px auto;
  line-height: 1.3;
  font-weight: 900;
}

.hero h3 {
  max-width: 700px;
  font-size: 48px;
  margin: 15px auto;
  line-height: 1.3;
  font-weight: 700;
}

.hero p {
  max-width: 500px;
  margin: auto;
  font-size: 20px;
}

.hero .version {
  font-size: 14px;
}

.hero .version span {
  background-color: var(--bg-off);
  padding: 4px 20px;
  border-radius: 3px;
  margin-left: 20px;
}

form {
  display: flex;
  max-width: 480px;
  margin: 45px auto;
}

form input {
  border: 2px solid var(--border-color);
  background-color: var(--page-bg-color);
  color: var(--text-color);
  height: 48px;
  border-radius: 6px;
  padding: 0 13px;
  width: 100%;
  outline: none;
  margin: 10px 15px 10px auto;
  transition: all 0.3s;
}

form input:focus {
  border: 2px solid var(--border-color-lighter);
  transition: all 0.3s;
}

form input[type=submit] {
  background-color: var(--theme-color);
  border: none;
  color: #fff;
  width: 220px;
  cursor: pointer;
  transition: all 0.3s;
  font-weight: 600;
  margin-right: 0;
}

form input[type=submit]:hover {
  opacity: 0.8;
  transition: all 0.3s;
}

.hero .hero-banner {
  padding: 30px 0;
  margin-top: 30px;
}

.hero img {
  max-width: 900px;
  width: 100%;
  height: auto;
  margin: auto;
  border-radius: 16px;
  opacity: var(--opacity-img);
}

.hero .hero-banner .into-video {
  font-size: 15px;
  font-weight: 600;
  margin-top: 40px;
}

.hero .hero-banner .into-video::after {
  content: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' class='h-5 w-5' viewBox='0 0 20 20' fill='currentColor' %3E%3Cpath fill-rule='evenodd' d='M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-8.707l-3-3a1 1 0 00-1.414 1.414L10.586 9H7a1 1 0 100 2h3.586l-1.293 1.293a1 1 0 101.414 1.414l3-3a1 1 0 000-1.414z' clip-rule='evenodd' /%3E%3C/svg%3E");
  margin-left: 10px;
  margin-top: 3px;
  vertical-align: middle;
  display: inline-block;
  width: 18px;
  filter: var(--img-filter);
}

.sub-hero {
  margin-top: 160px;
}

/* Top Feature Section  ********************************/
.top-feature {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(29.85rem, 100%), 1fr));
  background-color: var(--bg-off);
  align-items: center;
  margin-top: 60px;
  border-radius: 16px;
}

.top-feature .f-info {
  max-width: 480px;
  padding: 0 50px;
}

.top-feature .f-info h4 {
  font-size: 26px;
  margin-bottom: 10px;
}

.top-feature .f-info p {
  margin-bottom: 20px;
}

.top-feature .f-banner img {
  border-radius: 0 16px 16px 0;
}

.top-feature .learn-more::after {
  content: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' class='h-6 w-6' fill='none' viewBox='0 0 24 24' stroke='currentColor'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M17 8l4 4m0 0l-4 4m4-4H3' /%3E%3C/svg%3E");
  margin-left: 10px;
  margin-top: 3px;
  vertical-align: middle;
  display: inline-block;
  width: 18px;
  filter: var(--img-filter);
}


/* Main Page Feature Section  ********************************/
.feature {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: 30px;
  max-width: 800px;
  margin: 60px auto;
}

.feature div {
  background-color: var(--bg-off);
  border-radius: 16px;
  padding: 20px;
}

.icon img {
  max-width: 44px;
  filter: var(--img-filter);
}

.f-content {
  display: flex;
  flex-direction: column;
  margin-top: -20px;
}

.f-content h3 {
  font-size: 26px;
  font-weight: 600;
}

.f-content p {
  font-size: 18px;
  margin-top: 10px;
  line-height: 1.6;
  opacity: 0.9;
}

/* Follow ********************************/
.follow {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: 30px;
  max-width: 800px;
  margin: 160px auto;
  text-align: center;
}

.follow div {
  padding: 20px;
}

.follow .f-content h3 {
  font-size: 24px;
  font-weight: 700;
}

.follow .icon img {
  max-width: 44px;
  filter: var(--img-filter);
  margin: auto;
}

.follow .twitter {
  border-left: 2px solid var(--bg-off);
}

#notify {
  margin-bottom: 100px;
}

/* Footer ********************************/
footer {
  padding-top: 60px;
  margin-bottom: 80px;
  border-top: 1px solid var(--bg-off);
}

.action-block {
  width: 100%;
  border-top: 1px solid var(--border-color-light);
  border-bottom: 1px solid var(--border-color-light);
  padding: 60px 20px;
}

.action-block h2 {
  text-align: center;
}

.action-block form {
  max-width: 560px;
  margin: 45px auto;
}

.footer-link {
  max-width: 1200px;
  margin: 30px auto;
  color: var(--text-color-muted);
  font-size: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
  padding: 0 20px;
}

.footer-link a {
  color: var(--text-color-muted);
}

.footer-link ul {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  padding: 0;
  margin: 0;
  justify-content: center;
}

.copyright-text {
  color: var(--border-color);
}

.theme-switcher p {
  font-size: 12px;
  color: var(--text-color-muted);
  border: 1px solid var(--border-color-light);
  padding: 2px 8px 4px 8px;
  text-transform: capitalize;
  transition: all 0.3s ease;
  text-align: center;
  display: inline-block;
}

.theme-switcher a img {
  width: 20px;
  filter: var(--img-filter);
}

.theme-switcher .toggle-button {
  cursor: pointer;
}

/* Responsive Design Breakpoints ********************************/

@media only screen and (max-width: 768px) {
  main .hero h2 {
    font-size: 48px;
    max-width: 100%;
    margin-top: -20px;
  }

  .hero h3 {
    font-size: 36px;
  }

  main .hero p {
    font-size: 18px;
    max-width: 100%;
  }

  .sub-hero {
    margin-top: 100px;
    margin-bottom: -20px;
  }

  nav .social-icon {
    margin-top: 7px;
  }

  .top-feature .f-info {
    max-width: 480px;
    padding: 30px 20px;
  }

  .top-feature .f-info h4 {
    font-size: 24px;
    margin-bottom: 10px;
  }

  .top-feature .f-banner img {
    border-radius: 0 0 16px 16px;
  }

  .feature {
    margin-top: 80px;
  }

  .feature div {
    flex-direction: column;
    gap: 0;
  }

  .follow .twitter {
    border-left: none;
  }

  .follow {
    margin: 80px auto;
  }

  footer {
    margin-bottom: 40px;
    padding-top: 40px;
  }

}

@media only screen and (max-width: 600px) {
  nav {
    flex-wrap: wrap;
    flex-grow: 1;
    gap: 10px 30px;
    margin-top: -10px;
  }

  nav .main-nav {
    order: 3;
  }

  form {
    margin: 40px 0;
    flex-direction: column;
    max-width: 100%;
  }

  form input[type=submit] {
    width: 100%;
  }
}