:root {
  color-scheme: dark;
  --night: #07121f;
  --panel: rgba(10, 24, 42, .88);
  --text: #edf7ff;
  --soft-text: #d5e8f6;
  --muted: #91b2cd;
  --cyan: #55c9f2;
  --cyan-light: #c9f0ff;
  --blue-soft: #8dbaff;
  --ice: #a8e5f0;
}

* { box-sizing: border-box; }

html {
  min-width: 280px;
  min-height: 100%;
  background: var(--night);
  scroll-behavior: smooth;
}

body {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  padding: max(28px, env(safe-area-inset-top)) 20px max(28px, env(safe-area-inset-bottom));
  overflow-x: hidden;
  color: var(--text);
  background:
    radial-gradient(ellipse at 85% 12%, rgba(15, 85, 150, .34), transparent 38%),
    radial-gradient(ellipse at 8% 86%, rgba(0, 140, 170, .19), transparent 34%),
    linear-gradient(142deg, #0c1c30 0%, #07121f 50%, #030811 100%);
  font-family: "Vazirmatn", "Segoe UI", Tahoma, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before,
body::after {
  position: fixed;
  z-index: -1;
  inset: 0;
  pointer-events: none;
  content: "";
}

body::before {
  opacity: .52;
  background-image:
    radial-gradient(1px 1px at 13% 19%, rgba(199, 237, 255, .9) 50%, transparent 100%),
    radial-gradient(2px 2px at 82% 12%, rgba(93, 196, 244, .7) 50%, transparent 100%),
    radial-gradient(1px 1px at 75% 78%, rgba(160, 209, 255, .8) 50%, transparent 100%),
    radial-gradient(1px 1px at 17% 68%, rgba(199, 237, 255, .7) 50%, transparent 100%),
    radial-gradient(1px 1px at 54% 6%, rgba(163, 239, 247, .8) 50%, transparent 100%),
    radial-gradient(1px 1px at 92% 51%, rgba(199, 237, 255, .65) 50%, transparent 100%);
}

body::after {
  background: linear-gradient(90deg, rgba(4, 3, 9, .19), transparent 18%, transparent 82%, rgba(4, 3, 9, .19));
}

.ambient {
  position: fixed;
  z-index: -1;
  width: min(50vw, 560px);
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .14;
  pointer-events: none;
}

.ambient--cyan {
  top: -24%;
  right: -17%;
  background: #267bbd;
}

.ambient--blue {
  bottom: -27%;
  left: -17%;
  background: #117f9e;
}

.page {
  width: min(100%, 790px);
  margin: auto;
}

.letter {
  position: relative;
  padding: clamp(30px, 5.3vw, 58px) clamp(24px, 7vw, 74px) clamp(30px, 5vw, 52px);
  overflow: hidden;
  border: 1px solid rgba(90, 190, 242, .22);
  border-radius: 9px 30px 9px 30px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, .025), transparent 36%),
    var(--panel);
  box-shadow:
    0 32px 90px rgba(0, 0, 0, .38),
    inset 0 1px 0 rgba(212, 242, 255, .06),
    0 0 70px rgba(19, 138, 184, .07);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  text-align: right;
  animation: letter-arrive .85s cubic-bezier(.2, .7, .25, 1) both;
}

.letter::before {
  position: absolute;
  top: 42px;
  right: 0;
  width: 3px;
  height: 92px;
  border-radius: 3px 0 0 3px;
  content: "";
  background: linear-gradient(to bottom, transparent, var(--cyan), var(--blue-soft), transparent);
  box-shadow: 0 0 20px rgba(90, 190, 242, .22);
}

.letter::after {
  position: absolute;
  left: -56px;
  bottom: -76px;
  width: 175px;
  height: 175px;
  border: 1px solid rgba(120, 170, 255, .12);
  border-radius: 50%;
  box-shadow: 0 0 0 16px rgba(120, 170, 255, .025), 0 0 0 34px rgba(120, 170, 255, .02);
  content: "";
  pointer-events: none;
}

.ornament {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 13px;
  margin: 0 auto 17px;
  color: var(--cyan);
}

.ornament svg {
  width: 25px;
  height: 25px;
  fill: rgba(85, 201, 242, .08);
  stroke: currentColor;
  stroke-width: 1.15;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 7px rgba(90, 190, 242, .22));
}

.ornament__line {
  display: block;
  width: clamp(48px, 10vw, 88px);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(85, 201, 242, .62));
}

.ornament__line:last-child {
  transform: rotate(180deg);
}

h1 {
  margin: 0;
  color: #ecf9ff;
  font-size: clamp(2rem, 4.8vw, 2.85rem);
  font-weight: 700;
  font-style: italic;
  line-height: 1.55;
  letter-spacing: -.035em;
  text-align: center;
  text-wrap: balance;
  text-shadow: 0 3px 28px rgba(85, 201, 242, .11);
}

.intro-line {
  margin: 17px 0 29px;
  padding: 12px 18px 13px;
  border-right: 2px solid var(--cyan);
  border-radius: 0 8px 8px 0;
  color: var(--cyan-light);
  background: linear-gradient(270deg, rgba(85, 201, 242, .105), rgba(85, 201, 242, .025) 70%, transparent);
  font-size: clamp(1.05rem, 2.7vw, 1.3rem);
  font-weight: 500;
  line-height: 1.95;
}

.intro-line em {
  font-style: italic;
}

.poem {
  position: relative;
  z-index: 1;
  margin: 21px 0 0;
  color: var(--soft-text);
  font-size: clamp(1.03rem, 2.25vw, 1.17rem);
  font-weight: 400;
  font-style: normal;
  line-height: 2.02;
  text-wrap: pretty;
}

.continue-button {
  position: relative;
  z-index: 1;
  display: inline-flex;
  min-height: 52px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 13px;
  margin-top: 33px;
  padding: 13px 21px;
  border: 1px solid rgba(210, 244, 255, .66);
  border-radius: 8px 20px 8px 20px;
  color: #061521;
  background: linear-gradient(118deg, #95e5f8, #8baeff);
  box-shadow: 0 8px 26px rgba(25, 135, 196, .16), inset 0 1px 0 rgba(255, 255, 255, .54);
  font: inherit;
  font-size: .94rem;
  font-weight: 700;
  line-height: 1.6;
  text-decoration: none;
  transition: transform .22s ease, box-shadow .22s ease, filter .22s ease;
  -webkit-tap-highlight-color: transparent;
}

.continue-button svg {
  width: 19px;
  height: 19px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
  transition: transform .22s ease;
}

.continue-button:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
  box-shadow: 0 13px 34px rgba(25, 135, 196, .24), inset 0 1px 0 rgba(255, 255, 255, .64);
}

.continue-button:hover svg { transform: translateX(-3px); }

.continue-button:focus-visible {
  outline: 3px solid var(--cyan-light);
  outline-offset: 5px;
}

@keyframes letter-arrive {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  body { padding-right: 13px; padding-left: 13px; }
  .letter {
    padding: 27px 20px 28px;
    border-radius: 7px 22px 7px 22px;
  }
  .letter::before { top: 31px; height: 70px; }
  .ornament { margin-bottom: 13px; }
  .ornament svg { width: 22px; height: 22px; }
  h1 { font-size: clamp(1.85rem, 7.3vw, 2.25rem); }
  .intro-line { margin: 14px 0 22px; padding: 10px 13px; font-size: 1.15rem; line-height: 1.9; }
  .poem { margin-top: 17px; font-size: 1rem; line-height: 2.0; }
  .continue-button { margin-top: 26px; gap: 10px; padding: 12px 15px; font-size: 1rem; }
}

@media (max-height: 760px) and (min-width: 601px) {
  body { align-items: flex-start; }
  .letter { padding-top: 29px; padding-bottom: 29px; }
  .ornament { margin-bottom: 11px; }
  h1 { font-size: 2rem; }
  .intro-line { margin: 10px 0 18px; }
  .poem { line-height: 1.92; }
  .continue-button { margin-top: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}