/* ============================================
   FULL RESPONSIVE DESIGN - ALL SCREEN SIZES
   ============================================ */

/* ===== BASE RESPONSIVE SETUP ===== */
* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-size: 14px;
  line-height: 1.6;
}

/* ===== VIEWPORT & CONTAINER ===== */
.l-viewport {
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.l-wrapper {
  width: 1440px;
  max-width: 95%;
  height: 100%;
  margin: 0 auto;
  padding: 0 10px;
}

/* ===== HEADER ===== */
.header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 10;
  padding: 0 15px;
}

.header--logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: #fff;
}

.header--logo p {
  margin: 0 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
}

.header--nav-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  width: 40px;
  height: 40px;
}

.header--nav-toggle span,
.header--nav-toggle::before,
.header--nav-toggle::after {
  content: "";
  position: relative;
  width: 16px;
  height: 2px;
  background-color: #fff;
}

.header--nav-toggle::before {
  bottom: 5px;
  width: 20px;
}

.header--nav-toggle::after {
  top: 5px;
  width: 20px;
}

/* ===== SIDE NAVIGATION ===== */
.l-side-nav {
  position: absolute;
  left: 0;
  display: flex;
  height: 100%;
  align-items: center;
}

.side-nav {
  position: relative;
  display: flex;
  width: 100px;
  height: 70%;
  max-height: 750px;
  flex-direction: column;
  justify-content: space-around;
  margin: 0;
  padding: 0;
  list-style-position: inside;
  z-index: 10;
}

.side-nav li {
  position: relative;
  top: -5px;
  color: var(--theme-text);
  font-size: 6px;
  cursor: pointer;
}

.side-nav li span {
  position: relative;
  top: 3px;
  left: 10px;
  color: var(--theme-text);
  font-size: 14px;
  font-weight: 300;
  opacity: 0;
  visibility: hidden;
}

.side-nav li::before {
  position: absolute;
  top: 3px;
  left: 10px;
  color: var(--theme-muted);
  font-size: 14px;
  font-weight: 300;
}

.side-nav li:nth-child(1)::before { content: "01"; }
.side-nav li:nth-child(2)::before { content: "02"; }
.side-nav li:nth-child(3)::before { content: "03"; }
.side-nav li:nth-child(4)::before { content: "04"; }
.side-nav li:nth-child(5)::before { content: "05"; }

.side-nav li.is-active {
  color: var(--theme-accent);
  transition: color .4s ease-in-out;
}

.side-nav li.is-active span {
  opacity: 1;
  visibility: visible;
  transition: opacity .4s ease-in-out;
}

.side-nav li.is-active::before {
  left: -33px;
  color: var(--theme-accent);
}

/* ===== MAIN SECTIONS ===== */
.l-main-content {
  position: relative;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

.l-section {
  position: absolute;
  width: 100%;
  height: 100%;
}

.section {
  opacity: 0;
  visibility: hidden;
  transition: opacity .4s ease-in-out, visibility 0s .4s;
}

.section--is-active {
  opacity: 1;
  visibility: visible;
  z-index: 1;
  transition: opacity .4s ease-in-out .4s;
}

/* ===== INTRO SECTION ===== */
.intro {
  position: relative;
  display: flex;
  width: 100%;
  max-width: 900px;
  height: 100%;
  flex-direction: column;
  justify-content: center;
  margin: 0 auto;
  padding: 20px;
}

.intro--banner {
  position: relative;
  height: auto;
  min-height: 300px;
  text-align: center;
}

.intro--banner h1 {
  position: relative;
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 900;
  line-height: 1.2;
  z-index: 1;
  background: linear-gradient(90deg, #5a7cff, #fff, #5a7cff);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 4s ease-in-out infinite;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.intro--banner button {
  position: relative;
  padding: 12px 25px 12px 20px;
  font-weight: 700;
  text-transform: uppercase;
  background-color: transparent;
  border: 2px solid #5a7cff;
  border-radius: 4px;
  cursor: pointer;
  overflow: hidden;
  transition: all .3s ease-in-out;
  color: #fff;
  font-size: 16px;
  margin: 20px auto;
  display: block;
}

.intro--banner button .btn-background {
  position: absolute;
  top: 0;
  left: 100%;
  right: 0;
  height: 100%;
  background-color: #5a7cff;
  z-index: -1;
  transition: left .3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.intro--banner button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(15,51,255,0.4);
  color: #0c0c0c;
}

.intro--banner button:hover .btn-background {
  left: 0;
}

.intro--banner button svg {
  position: relative;
  left: 5px;
  width: 15px;
  fill: #fff;
  transition: transform .3s ease-in-out, fill .3s ease-in-out;
}

.intro--banner button:hover svg {
  transform: translateX(4px);
  fill: #0c0c0c;
}

.intro--options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  width: 100%;
}