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

html,
body {
  width: 100%;
  height: 100%;
  height: 100dvh; /* Dynamic viewport height cho mobile */
  overflow: hidden;
  font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
}

/* ===== CONTAINER ===== */
#container {
  width: 100vw;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  background: radial-gradient(circle at center, #000010 0%, #000000 100%);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
}

/* ===== CANVAS ===== */
canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100% !important;
  height: 100% !important;
  z-index: 11;
  touch-action: none;
}

/* ===== LANDSCAPE WARNING ===== */
#landscape-warning {
  display: none !important;
  position: fixed;
  z-index: 9999;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center, #1a237e 0%, #000 100%);
  color: #e61313;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.7s cubic-bezier(0.4, 2, 0.6, 1);
  padding: 1rem;
}

#landscape-warning .warning-content {
  position: relative;
  z-index: 2;
  padding: 1.5rem 2rem;
  border-radius: 24px;
  background: rgba(20, 30, 60, 0.85);
  box-shadow: 0 0 32px 8px #00eaff44, 0 0 0 2px #fff2 inset;
  border: 1.5px solid #00eaff88;
  max-width: 90vw;
}

#landscape-warning h1 {
  font-family: 'Orbitron', 'Montserrat', Arial, sans-serif;
  font-size: clamp(1.4rem, 5vw, 2.2rem);
  margin-bottom: 0.8rem;
  letter-spacing: 2px;
  color: #eb0f0f;
}

#landscape-warning p {
  font-size: clamp(1rem, 3.5vw, 1.3rem);
  color: #e6131a;
  text-shadow: 0 0 8px #00eaff99, 0 0 2px #e40606;
}

/* ===== ROTATE ICON ===== */
.rotate-icon {
  width: clamp(40px, 12vw, 56px);
  height: clamp(40px, 12vw, 56px);
  margin: 0 auto 1rem auto;
  background: url('data:image/svg+xml;utf8,<svg width="56" height="56" viewBox="0 0 56 56" fill="none" xmlns="http://www.w3.org/2000/svg"><rect x="12" y="16" width="32" height="24" rx="6" fill="%23fff" stroke="%2300eaff" stroke-width="2"/><path d="M28 8v4" stroke="%2300eaff" stroke-width="2" stroke-linecap="round"/><path d="M28 44v4" stroke="%2300eaff" stroke-width="2" stroke-linecap="round"/><path d="M8 28h4" stroke="%2300eaff" stroke-width="2" stroke-linecap="round"/><path d="M44 28h4" stroke="%2300eaff" stroke-width="2" stroke-linecap="round"/><path d="M18 38l-4 4" stroke="%23a259f7" stroke-width="2" stroke-linecap="round"/><path d="M38 38l4 4" stroke="%23a259f7" stroke-width="2" stroke-linecap="round"/><path d="M18 18l-4-4" stroke="%23a259f7" stroke-width="2" stroke-linecap="round"/><path d="M38 18l4-4" stroke="%23a259f7" stroke-width="2" stroke-linecap="round"/></svg>') center/contain no-repeat;
  animation: rotate-phone 1.6s infinite cubic-bezier(0.4, 2, 0.6, 1);
}

@keyframes rotate-phone {
  0% { transform: rotate(-18deg); }
  20% { transform: rotate(18deg); }
  40% { transform: rotate(-18deg); }
  100% { transform: rotate(-18deg); }
}

/* ===== STARFIELD BACKGROUND ===== */
#landscape-warning .stars-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.7;
  animation: stars-move 16s linear infinite;
  background:
    radial-gradient(circle, #ee0606 1.2px, transparent 1.2px) 20px 30px / 80px 80px repeat,
    radial-gradient(circle, #df0808 1.5px, transparent 1.5px) 60px 80px / 120px 120px repeat,
    radial-gradient(circle, #00eaff 1.2px, transparent 1.2px) 40px 60px / 100px 100px repeat,
    radial-gradient(circle, #df0d0d 0.8px, transparent 0.8px) 10px 10px / 40px 40px repeat;
}

#landscape-warning .stars-bg::before,
#landscape-warning .stars-bg::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0.7;
  animation: stars-move 16s linear infinite;
  background-image:
    radial-gradient(circle, #e00303 1.2px, transparent 1.2px),
    radial-gradient(circle, #00eaff 1.2px, transparent 1.2px),
    radial-gradient(circle, #da1212 0.8px, transparent 0.8px);
}

#landscape-warning .stars-bg::before {
  background-size: 80px 80px, 120px 120px, 40px 40px;
  background-position: 0 0, 40px 40px, 20px 20px;
}

#landscape-warning .stars-bg::after {
  opacity: 0.5;
  background-size: 120px 120px, 60px 60px, 100px 100px;
  background-position: 60px 60px, 30px 30px, 10px 10px;
  animation-duration: 24s;
}

@keyframes stars-move {
  0% { background-position: 20px 30px, 60px 80px, 40px 60px, 10px 10px; }
  100% { background-position: 100px 100px, 0px 0px, 60px 60px, 40px 40px; }
}

/* ===== DARK OVERLAY ===== */
#dark-overlay {
  position: fixed;
  z-index: 5;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 30, 0.92);
  pointer-events: none;
  transition: opacity 0.6s;
  opacity: 1;
}

/* ===== START BUTTON ===== */
#start-btn {
  font-size: clamp(1.2rem, 4vw, 2rem);
  padding: clamp(0.8rem, 2vw, 1rem) clamp(2rem, 5vw, 2.5rem);
  border-radius: 2rem;
  border: none;
  background: linear-gradient(90deg, #ffb6e6, #a259c7, #00eaff);
  color: #fd0707;
  box-shadow: 0 0 24px #fff6, 0 0 8px #00eaff;
  cursor: pointer;
  transition: background 0.3s;
}

/* ===== RESPONSIVE: Portrait Mode ===== */
body.portrait #dark-overlay {
  display: none !important;
  opacity: 0 !important;
}

/* ===== RESPONSIVE: Canvas ===== */
body.landscape-warning-active #container canvas,
body.portrait #container canvas {
  filter: blur(12px) brightness(0.5) grayscale(0.3);
  opacity: 0.3;
  transition: filter 0.7s, opacity 0.7s cubic-bezier(0.4, 2, 0.6, 1);
}

body:not(.landscape-warning-active):not(.portrait) #container canvas {
  filter: blur(0) brightness(1) grayscale(0);
  opacity: 1;
  transition: filter 1.2s, opacity 1.2s cubic-bezier(0.4, 2, 0.6, 1);
}

/* ===== RESPONSIVE: Landscape Warning ===== */
body.landscape-warning-active #landscape-warning {
  opacity: 1;
  pointer-events: auto;
}

/* ===== HIDDEN WHEN NOT INTRO ===== */
body:not(.intro-started):not(.portrait) #info,
body:not(.intro-started):not(.portrait) #landscape-warning,
body:not(.intro-started):not(.portrait) .main-content,
body:not(.intro-started):not(.portrait) .text-ring,
body:not(.intro-started):not(.portrait) .galaxy-points,
body:not(.intro-started):not(.portrait) .starfield {
  opacity: 0 !important;
  pointer-events: none !important;
}

/* ===== DARK OVERLAY STATE ===== */
body.intro-started #dark-overlay {
  opacity: 0;
  transition: opacity 1.2s;
}

body:not(.intro-started):not(.portrait) #dark-overlay {
  display: block;
  opacity: 1;
}

/* ===== RESPONSIVE: Extra Small Screens ===== */
@media screen and (max-width: 360px) {
  #landscape-warning .warning-content {
    padding: 1rem 1.2rem;
    border-radius: 16px;
  }

  #landscape-warning h1 {
    font-size: 1.2rem;
    letter-spacing: 1px;
  }
}

/* ===== RESPONSIVE: Tablets ===== */
@media screen and (min-width: 768px) and (max-width: 1024px) {
  #landscape-warning .warning-content {
    padding: 2rem 3rem;
  }
}

/* ===== RESPONSIVE: Large Screens ===== */
@media screen and (min-width: 1920px) {
  #container {
    font-size: 1.2em;
  }
}