/* Shared theme for the registration and task forms */
@font-face { font-family: "New Kansas"; font-weight: 500; font-display: swap; src: url(fonts/new-kansas-500.woff2) format("woff2"); }
@font-face { font-family: "TT Neoris"; font-weight: 400; font-display: swap; src: url(fonts/tt-neoris-400.ttf) format("truetype"); }
@font-face { font-family: "TT Neoris"; font-weight: 500; font-display: swap; src: url(fonts/tt-neoris-500.ttf) format("truetype"); }

:root {
  --paper: #ffffff;
  --ink: #161616;
  --text: #6b6b6b;
  --muted: #9a9a9a;
  --rule: #ececeb;
  --box: #f5f5f4;
  --box-line: #d6d6d3;
  --accent: #0a6cff;
  --danger: #c4372b;
  --display: "New Kansas", "Iowan Old Style", Georgia, serif;
  --body: "TT Neoris", -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --ease: cubic-bezier(0.2, 0, 0, 1);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #121212; --ink: #f1f1ef; --text: #a3a3a0; --muted: #77776f;
    --rule: #262624; --box: #1b1b1a; --box-line: #3a3a37; --accent: #5ea0ff; --danger: #ff7a6e;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #121212; --ink: #f1f1ef; --text: #a3a3a0; --muted: #77776f;
  --rule: #262624; --box: #1b1b1a; --box-line: #3a3a37; --accent: #5ea0ff; --danger: #ff7a6e;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--body);
  font-size: 1.125rem;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
p { margin: 0; }
a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.mark {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--ink);
  letter-spacing: 0.01em;
  text-decoration: none;
}

/* ---------- Form pages: one centred column ---------- */
.form-page {
  min-height: 100svh;
  display: grid;
  grid-template-columns: min(30rem, 100%);
  justify-content: center;
  align-content: start;
  padding-block: 3rem 5rem;
  font-size: 1rem;
  line-height: 1.55;
}
.form-head { display: grid; justify-items: center; text-align: center; gap: 0.9rem; margin-bottom: 2.6rem; }
.form-head .mark { margin-bottom: 1.6rem; }
.form-head .logo { display: block; margin-bottom: 1.4rem; line-height: 0; border-radius: 6px; }
.form-head .logo img { display: block; height: 32px; width: auto; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .form-head .logo img { filter: brightness(0) invert(1); } }
:root[data-theme="dark"] .form-head .logo img { filter: brightness(0) invert(1); }
.eyebrow { font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
.form-head h1 {
  font-family: var(--display);
  font-weight: 500;
  color: var(--ink);
  font-size: clamp(2rem, 7vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  text-wrap: balance;
  margin: 0;
}
.form-head p { max-width: 26rem; text-wrap: pretty; }

form { display: grid; gap: 1.35rem; }
.field { display: grid; gap: 0.45rem; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: start; }
label, .label { color: var(--ink); font-weight: 500; font-size: 0.95rem; }
.opt { color: var(--muted); font-weight: 400; }
.req { color: var(--danger); font-weight: 400; margin-left: 0.1rem; }

/* Phone with fixed +91 prefix */
.phone {
  display: flex;
  align-items: center;
  background: var(--box);
  border: 1px solid transparent;
  border-radius: 10px;
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease), box-shadow 160ms var(--ease);
}
.phone:hover { border-color: var(--box-line); }
.phone:focus-within { background-color: var(--paper); border-color: var(--ink); box-shadow: 0 0 0 4px color-mix(in srgb, var(--ink) 8%, transparent); }
.field.invalid .phone { border-color: var(--danger); }
.phone .prefix {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0 0.85rem 0 0.95rem;
  color: var(--ink);
  font-weight: 500;
  border-right: 1px solid var(--box-line);
  align-self: stretch;
  font-variant-numeric: tabular-nums;
}
.phone .flag { font-size: 1.1rem; line-height: 1; }
.phone input[type="tel"], .phone input[type="tel"]:hover, .phone input[type="tel"]:focus {
  border: 0;
  background: transparent;
  box-shadow: none;
  letter-spacing: 0.02em;
}

/* Field tooltip ("Write it raw"): shown while its field is focused and empty; form.js picks the side with room */
.tip {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 50;
  width: max-content;
  max-width: min(17rem, calc(100vw - 24px));
  margin: 0;
  padding: 0.8rem 0.95rem;
  border-radius: 12px;
  background: var(--ink);
  color: color-mix(in srgb, var(--paper) 78%, var(--ink));
  font-size: 0.875rem;
  line-height: 1.5;
  text-wrap: pretty;
  box-shadow: 0 14px 34px -14px rgba(0, 0, 0, 0.4);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transform: translate(var(--nx, 0px), var(--ny, 0px));
  transition: opacity 160ms var(--ease), transform 220ms var(--ease), visibility 0s linear 220ms;
}
.tip strong { display: block; margin-bottom: 0.15rem; color: var(--paper); font-weight: 500; }
.tip.show { opacity: 1; visibility: visible; transform: none; transition: opacity 160ms var(--ease), transform 220ms var(--ease), visibility 0s; }
.tip::before { content: ""; position: absolute; width: 10px; height: 10px; background: inherit; border-radius: 2px; transform: rotate(45deg); }
.tip[data-side="right"] { --nx: -6px; }
.tip[data-side="left"] { --nx: 6px; }
.tip[data-side="top"] { --ny: 6px; }
.tip[data-side="bottom"] { --ny: -6px; }
.tip[data-side="right"]::before { left: -4px; top: var(--arrow, 18px); margin-top: -5px; }
.tip[data-side="left"]::before { right: -4px; top: var(--arrow, 18px); margin-top: -5px; }
.tip[data-side="top"]::before { bottom: -4px; left: var(--arrow, 24px); margin-left: -5px; }
.tip[data-side="bottom"]::before { top: -4px; left: var(--arrow, 24px); margin-left: -5px; }
.hint { font-size: 0.85rem; color: var(--muted); }

input[type="text"], input[type="email"], input[type="tel"], input[type="url"], select, textarea {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  color: var(--ink);
  background: var(--box);
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 0.8rem 0.95rem;
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease), box-shadow 160ms var(--ease);
  -webkit-appearance: none;
  appearance: none;
}
textarea { min-height: 7.5rem; resize: vertical; line-height: 1.55; }
select {
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 1.15rem) 50%, calc(100% - 0.85rem) 50%;
  background-size: 0.3rem 0.3rem;
  background-repeat: no-repeat;
  padding-right: 2.2rem;
}
::placeholder { color: var(--muted); opacity: 1; }
select:invalid { color: var(--muted); }
select option { color: var(--ink); }
input:hover, select:hover, textarea:hover { border-color: var(--box-line); }
input:focus, select:focus, textarea:focus {
  outline: none;
  background-color: var(--paper);
  border-color: var(--ink);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--ink) 8%, transparent);
}
.field.invalid input, .field.invalid select, .field.invalid textarea, .field.invalid .drop { border-color: var(--danger); }
.error { font-size: 0.85rem; color: var(--danger); }
.error:empty { display: none; }

/* Segmented yes/no */
.segmented { display: grid; grid-template-columns: 1fr 1fr; gap: 0.35rem; padding: 0.3rem; background: var(--box); border-radius: 12px; border: 1px solid transparent; position: relative; }
.field.invalid .segmented { border-color: var(--danger); }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label {
  text-align: center;
  padding: 0.6rem;
  border-radius: 9px;
  cursor: pointer;
  color: var(--text);
  font-weight: 500;
  transition: background-color 160ms var(--ease), color 160ms var(--ease), box-shadow 160ms var(--ease);
}
.segmented input:checked + label { background: var(--paper); color: var(--ink); box-shadow: 0 1px 2px rgb(0 0 0 / 0.08), 0 0 0 1px var(--rule); }
.segmented input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: 2px; }

/* File drop */
.drop {
  position: relative;
  display: grid;
  place-items: center;
  gap: 0.25rem;
  text-align: center;
  padding: 1.6rem 1rem;
  border: 1px dashed var(--box-line);
  border-radius: 12px;
  background: var(--box);
  cursor: pointer;
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}
.drop:hover, .drop.over { border-color: var(--ink); }
.drop.over { background: var(--paper); }
.drop input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.drop:focus-within { outline: 2px solid var(--accent); outline-offset: 3px; }
.drop strong { color: var(--ink); font-weight: 500; }
.drop-label { display: grid; gap: 0.15rem; }
.drop .file-name { color: var(--ink); font-weight: 500; word-break: break-all; }

/* Checkbox */
.check { display: grid; grid-template-columns: auto 1fr; gap: 0.75rem; align-items: start; cursor: pointer; font-weight: 400; color: var(--text); }
.check input {
  appearance: none; -webkit-appearance: none;
  width: 1.2rem; height: 1.2rem; margin: 0.15rem 0 0;
  border: 1px solid var(--box-line); border-radius: 5px; background: var(--box);
  display: grid; place-items: center; cursor: pointer;
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease);
}
.check input::after { content: ""; width: 0.55rem; height: 0.3rem; border: 2px solid var(--paper); border-top: 0; border-right: 0; transform: rotate(-45deg) translate(1px, -1px) scale(0); transition: transform 160ms var(--ease); }
.check input:checked { background: var(--ink); border-color: var(--ink); }
.check input:checked::after { transform: rotate(-45deg) translate(1px, -1px) scale(1); }
.field.invalid .check input { border-color: var(--danger); }

.count { justify-self: end; font-size: 0.8rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.count.over { color: var(--danger); }

button.primary {
  margin-top: 0.6rem;
  font: inherit;
  font-weight: 500;
  font-size: 1rem;
  color: var(--paper);
  background: var(--ink);
  border: 0;
  border-radius: 12px;
  padding: 0.95rem 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: transform 120ms var(--ease), opacity 160ms var(--ease);
}
button.primary:hover { opacity: 0.88; }
button.primary:active { transform: scale(0.985); }
button.primary .arrow { transition: transform 200ms var(--ease); }
button.primary:hover .arrow { transform: translateX(3px); }
button.primary[disabled] { opacity: 0.6; cursor: progress; }
.fine { text-align: center; font-size: 0.85rem; color: var(--muted); }

/* Thank-you state */
.done { display: none; text-align: center; justify-items: center; gap: 1rem; }
.form-page.sent form, .form-page.sent .form-head > p, .form-page.sent .form-head h1 { display: none; }
.form-page.sent .done { display: grid; animation: rise 420ms var(--ease) both; }
.done .tick { width: 3rem; height: 3rem; border-radius: 50%; background: var(--ink); color: var(--paper); display: grid; place-items: center; }
.done .signature { font-family: var(--display); font-weight: 500; color: var(--ink); font-size: 1.6rem; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

@media (max-width: 560px) {
  .form-page { padding-block: 2.25rem 4rem; }
  .row { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0ms !important; animation: none !important; }
}

/* ---------- Send-off: the page goes into an envelope (mail.js) ---------- */
:root { --desk: #ecebe7; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --desk: #080808; } }
:root[data-theme="dark"] { --desk: #080808; }

html.mailing, html.mailing body { overflow: hidden; }
.mail-stage { position: fixed; inset: 0; z-index: 1000; overflow: hidden; }
.mail-desk { position: absolute; inset: 0; background: var(--desk); }
.mail-sheet { position: absolute; left: 0; top: 0; z-index: 3; transform-origin: 0 0; overflow: hidden; background: var(--paper); }
.mail-sheet-inner { padding-inline: max(16px, env(safe-area-inset-left, 0px)); background: var(--paper); }
.mail-note {
  position: absolute;
  left: 50%;
  z-index: 4;
  width: min(34rem, calc(100vw - 32px));
  display: grid;
  justify-items: center;
  gap: 0.6rem;
  text-align: center;
  font-size: 1rem;
  line-height: 1.55;
  visibility: hidden;
  transform: translate(-50%, 0);
}
.mail-note .signature { margin: 0; font-family: var(--display); font-weight: 500; color: var(--ink); font-size: clamp(1.6rem, 4.6vw, 2.1rem); line-height: 1.15; letter-spacing: -0.01em; text-wrap: balance; }
.mail-greet {
  position: absolute;
  left: 50%;
  z-index: 4;
  width: min(36rem, calc(100vw - 32px));
  display: grid;
  justify-items: center;
  gap: 0.45rem;
  text-align: center;
  visibility: hidden;
  transform: translate(-50%, 0);
}
.mail-greet .festive { margin: 0; font-family: var(--display); font-weight: 500; color: var(--ink); font-size: clamp(1.35rem, 3.8vw, 1.6rem); line-height: 1.2; text-wrap: balance; }
.mail-greet .smile { margin: 0; color: var(--text); font-size: 1rem; line-height: 1.5; }
/* Even out short centred lines so no single word is left alone on the last line */
.mail-note p, .mail-greet p { text-wrap: balance; }
/* "Submit another response": small and grey, under the envelope (form.js, data-remember) */
.mail-again {
  margin-top: 0.35rem;
  padding: 0.35rem 0.6rem;
  font: inherit;
  font-size: 0.85rem;
  color: var(--muted);
  background: none;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--muted) 40%, transparent);
  text-underline-offset: 3px;
  transition: color 160ms var(--ease), text-decoration-color 160ms var(--ease);
}
.mail-again:hover { color: var(--text); text-decoration-color: currentColor; }
.mail-again:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.done .mail-again { margin-top: 0.5rem; }
.done .festive { margin: 0; font-family: var(--display); font-weight: 500; color: var(--ink); font-size: 2rem; line-height: 1.1; }

/* The envelope stays light yellow paper in both themes */
.env {
  --env-face: #f8ebad;
  --env-side: #f4e29c;
  --env-bottom: #f7e7a6;
  --env-flap: #f9eeb7;
  --env-flap-in: #ecd98f;
  --env-in: #e5cf80;
  --env-ink: #3a3326;
  --env-label: #8f8152;
  position: absolute;
  z-index: 2;
  visibility: hidden;
  color: var(--env-ink);
}
.env-backside, .env-front { position: absolute; inset: 0; }

.env-back {
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: 0.35em;
  background: linear-gradient(to bottom, rgba(90, 70, 0, 0.16), transparent 40%), var(--env-in);
  box-shadow: 0 1.2em 2.6em -1em rgba(60, 45, 0, 0.35);
}
.env-flap { position: absolute; left: 0; top: 0; width: 100%; height: 56%; z-index: 2; filter: drop-shadow(0 0.1em 0.16em rgba(90, 65, 0, 0.25)); }
.env-flap i {
  position: absolute;
  inset: 0;
  transform-origin: 50% 0;
  transform: perspective(1200px) rotateX(0deg);
  clip-path: polygon(0 0, 100% 0, 54% 95%, 50% 100%, 46% 95%);
  background: linear-gradient(to bottom, var(--env-flap), #f4e3a0);
}
.env-flap.open i { transform: perspective(1200px) rotateX(180deg); background: var(--env-flap-in); }

.env-pocket { position: absolute; inset: 0; z-index: 4; clip-path: inset(0 round 0.35em); }
.env-pocket .sides, .env-pocket .bottom { position: absolute; inset: 0; }
.env-pocket .sides { filter: drop-shadow(0 -0.05em 0.12em rgba(90, 65, 0, 0.2)); }
.env-pocket .bottom { filter: drop-shadow(0 -0.08em 0.16em rgba(90, 65, 0, 0.22)); }
.env-pocket i { position: absolute; inset: 0; }
.env-pocket .l { background: var(--env-side); clip-path: polygon(0 0, 52% 54%, 0 100%); }
.env-pocket .r { background: linear-gradient(to left, #f1dd94, var(--env-side)); clip-path: polygon(100% 0, 48% 54%, 100% 100%); }
.env-pocket .bottom i { background: linear-gradient(to top, var(--env-bottom), #f9edb5); clip-path: polygon(0 100%, 50% 44%, 100% 100%); }

/* Address side, shown after the envelope turns over */
.env-front {
  display: none;
  border-radius: 0.35em;
  background: linear-gradient(165deg, #faefbd, var(--env-face) 45%, #f3e19b);
  box-shadow: inset 0 0 0 1px rgba(120, 95, 20, 0.12), 0 1.2em 2.6em -1em rgba(60, 45, 0, 0.35);
}
.env.turned .env-backside { display: none; }
.env.turned .env-front { display: block; }
.env-from { position: absolute; top: 1.5em; left: 1.6em; max-width: 52%; display: grid; gap: 0.1em; font-size: 0.85em; line-height: 1.3; }
.env-from span, .env-to span { font-size: 0.7em; letter-spacing: 0.14em; text-transform: uppercase; color: var(--env-label); font-weight: 500; }
.env-from b { font-family: var(--display); font-weight: 500; font-size: 1.35em; line-height: 1.2; overflow-wrap: anywhere; }
.env-to { position: absolute; left: 40%; top: 50%; display: grid; gap: 0.15em; line-height: 1.45; }
.env-to b { font-family: var(--display); font-weight: 500; font-size: 1.8em; line-height: 1.15; }
.env.portrait .env-from { top: 1.2em; left: 1.2em; }
.env.portrait .env-to { left: 12%; top: 48%; }
.env-stamp {
  position: absolute;
  top: 1.3em;
  right: 1.4em;
  width: 6em;
  opacity: 0;
  visibility: hidden;
  transform-origin: 60% 40%;
  filter: drop-shadow(0 0.08em 0.14em rgba(60, 40, 0, 0.3));
}
.env-postmark { position: absolute; top: 2.5em; right: 0.2em; width: 12em; opacity: 0; visibility: hidden; mix-blend-mode: multiply; transform-origin: 23% 50%; }
.env-stamp svg, .env-postmark svg { display: block; width: 100%; height: auto; }
.env svg text { font-family: var(--body); }

/* Portrait (phone) envelope: a shorter flap and a shallower opening, like a catalogue envelope */
.env.portrait .env-flap { height: 30%; }
.env.portrait .env-pocket .l { clip-path: polygon(0 0, 52% 30%, 0 100%); }
.env.portrait .env-pocket .r { clip-path: polygon(100% 0, 48% 30%, 100% 100%); }
.env.portrait .env-pocket .bottom i { clip-path: polygon(0 100%, 50% 25%, 100% 100%); }

/* Fixed value, like the college on a college's own form: reads as filled in, can't be changed */
.locked { position: relative; }
.locked input[readonly], .locked input[readonly]:hover, .locked input[readonly]:focus {
  color: var(--text);
  background: var(--box);
  border: 1px dashed var(--box-line);
  box-shadow: none;
  cursor: default;
  padding-right: 2.4rem;
}
.locked input[readonly]:focus-visible { border-style: solid; border-color: var(--ink); }
.locked svg { position: absolute; right: 0.95rem; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; }

/* ---------- Task page: the PDF's first page in the drop box, and the airmail send-off (airmail.js) ---------- */
.drop.has-preview { grid-template-columns: auto minmax(0, 1fr); place-items: center start; gap: 1.1rem; padding: 1.1rem 1.25rem; text-align: left; }
.drop.has-preview .drop-label { justify-items: start; }
.drop-thumb {
  display: block;
  width: 3.4rem;
  aspect-ratio: 1 / 1.414;
  background: #fff;
  border-radius: 2px;
  overflow: hidden;
  pointer-events: none;
  transform: rotate(-3deg);
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.14), 0 8px 16px -8px rgb(0 0 0 / 0.35);
}
.drop-thumb img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: top; }
.drop.rendering .drop-thumb { background: linear-gradient(100deg, #efefec 30%, #fff 50%, #efefec 70%) 0 0 / 200% 100%; animation: thumb-shimmer 1.1s linear infinite; }
@keyframes thumb-shimmer { to { background-position: -200% 0; } }

.air-stage { position: fixed; inset: 0; z-index: 1000; overflow: hidden; }
.air-veil { position: absolute; inset: 0; background: color-mix(in srgb, var(--paper) 72%, transparent); -webkit-backdrop-filter: blur(7px); backdrop-filter: blur(7px); opacity: 0; }
.air-desk { position: absolute; inset: 0; z-index: 1; background: var(--desk); opacity: 0; }
.air-caption {
  position: absolute;
  left: 50%;
  z-index: 4;
  width: min(24rem, calc(100vw - 32px));
  display: grid;
  justify-items: center;
  gap: 0.15rem;
  text-align: center;
  color: var(--ink);
  font-weight: 500;
  opacity: 0;
  transform: translate(-50%, 0);
}
.air-caption small { color: var(--muted); font-weight: 400; font-size: 0.85rem; text-wrap: balance; }
.air-caption .dots i { font-style: normal; animation: air-dot 1.2s infinite both; }
.air-caption .dots i:nth-child(2) { animation-delay: 0.2s; }
.air-caption .dots i:nth-child(3) { animation-delay: 0.4s; }
@keyframes air-dot { 0%, 80%, 100% { opacity: 0.2; } 40% { opacity: 1; } }

/* The page itself: panels that fold, each with the PDF on the front and plain paper on the back */
.air-letter { position: absolute; left: 0; top: 0; z-index: 3; transform-origin: 0 0; }
.air-letter.floating { animation: air-float 2.8s ease-in-out infinite; }
@keyframes air-float { 50% { translate: 0 -8px; } }
.air-letter .fold { position: absolute; left: 0; width: 100%; transform-style: preserve-3d; }
.air-letter .face { position: absolute; inset: 0; -webkit-backface-visibility: hidden; backface-visibility: hidden; }
.air-letter .front { background-color: #fff; background-repeat: no-repeat; }
.air-letter .back { transform: rotateX(180deg); background: linear-gradient(to bottom, #f7f5f0, #ebe7dd); }
.air-letter .shade { position: absolute; inset: 0; background: #1d1a14; opacity: 0; }

/* Airmail envelope: cream paper with red and blue striped edges, the same in both themes */
.air-env {
  --air-red: #b5402c;
  --air-blue: #24447d;
  --air-paper: #f3ead6;
  --air-shade: #e8dbbf;
  --air-in: #d8c8a5;
  --air-ink: #2e2920;
  --air-label: #8b7b5b;
  --air-sheet: radial-gradient(120% 90% at 18% 12%, rgb(255 255 255 / 0.55), transparent 55%), radial-gradient(90% 80% at 85% 90%, rgb(150 110 50 / 0.12), transparent 60%), var(--air-paper);
  --stripes: repeating-linear-gradient(-45deg, var(--air-red) 0 1.1em, var(--air-paper) 1.1em 1.45em, var(--air-blue) 1.45em 2.55em, var(--air-paper) 2.55em 2.9em);
  --stripes-mirror: repeating-linear-gradient(45deg, var(--air-red) 0 1.1em, var(--air-paper) 1.1em 1.45em, var(--air-blue) 1.45em 2.55em, var(--air-paper) 2.55em 2.9em);
  --band: 0.75em;
  --flap-x: 6.5%;
  --flap-y: 5.9%;
  --flap-tip: 92.9%;
  position: absolute;
  z-index: 2;
  visibility: hidden;
  color: var(--air-ink);
}
.air-env.portrait { --flap-x: 8.3%; --flap-y: 7.2%; --flap-tip: 90.5%; }
.air-backside, .air-front { position: absolute; inset: 0; }
.air-back {
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: 0.3em;
  background: linear-gradient(to bottom, rgb(70 50 10 / 0.2), transparent 45%), var(--air-in);
  box-shadow: 0 1.2em 2.6em -1em rgb(40 28 8 / 0.4);
}
.air-backside > .air-letter { z-index: 3; }
.air-flap { position: absolute; left: 0; top: 0; width: 100%; height: 54%; z-index: 2; filter: drop-shadow(0 0.1em 0.16em rgb(70 50 10 / 0.28)); }
.air-flap i {
  position: absolute;
  inset: 0;
  transform-origin: 50% 0;
  transform: perspective(1200px) rotateX(0deg);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  /* Mirrored stripes on the right half, so both slanted edges of the flap look the same */
  background: var(--stripes) left top / 50.5% 100% no-repeat, var(--stripes-mirror) right top / 50.5% 100% no-repeat;
}
.air-flap i b { position: absolute; inset: 0; clip-path: polygon(var(--flap-x) var(--flap-y), calc(100% - var(--flap-x)) var(--flap-y), 50% var(--flap-tip)); background: var(--air-sheet); }
.air-flap.open i { transform: perspective(1200px) rotateX(180deg); background: var(--air-shade); }
.air-flap.open i b { display: none; }

.air-pocket { position: absolute; inset: 0; z-index: 4; clip-path: inset(0 round 0.3em); }
.air-pocket .sides, .air-pocket .bottom, .air-pocket .ring { position: absolute; inset: 0; }
.air-pocket .sides { filter: drop-shadow(0 -0.05em 0.12em rgb(70 50 10 / 0.22)); }
.air-pocket .bottom { filter: drop-shadow(0 -0.08em 0.16em rgb(70 50 10 / 0.24)); }
.air-pocket i { position: absolute; inset: 0; }
.air-pocket .l { background: var(--air-paper); clip-path: polygon(0 0, 52% 54%, 0 100%); }
.air-pocket .r { background: linear-gradient(to left, var(--air-shade), var(--air-paper)); clip-path: polygon(100% 0, 48% 54%, 100% 100%); }
.air-pocket .bottom i { background: linear-gradient(to top, var(--air-shade), var(--air-paper)); clip-path: polygon(0 100%, 50% 44%, 100% 100%); }
.air-pocket .ring {
  padding: 0 var(--band) var(--band);
  background: var(--stripes);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
}
.air-env.portrait .air-flap { height: 30%; }
.air-env.portrait .air-pocket .l { clip-path: polygon(0 0, 52% 30%, 0 100%); }
.air-env.portrait .air-pocket .r { clip-path: polygon(100% 0, 48% 30%, 100% 100%); }
.air-env.portrait .air-pocket .bottom i { clip-path: polygon(0 100%, 50% 25%, 100% 100%); }

/* Address side */
.air-front {
  display: none;
  border-radius: 0.3em;
  background: var(--stripes);
  box-shadow: inset 0 0 0 1px rgb(80 60 20 / 0.18), 0 1.2em 2.6em -1em rgb(40 28 8 / 0.4);
}
.air-front::before { content: ""; position: absolute; inset: var(--band); border-radius: 0.12em; background: var(--air-sheet); }
.air-env.turned .air-backside { display: none; }
.air-env.turned .air-front { display: block; }
.air-label {
  position: absolute;
  top: 1.7em;
  left: 1.8em;
  display: grid;
  justify-items: center;
  padding: 0.3em 0.65em 0.28em;
  border: 0.11em solid var(--air-blue);
  border-radius: 0.18em;
  color: var(--air-blue);
  line-height: 1.25;
}
.air-label span:first-child { font-size: 0.6em; font-weight: 500; letter-spacing: 0.2em; text-transform: uppercase; }
.air-label span:last-child { font-size: 0.72em; }
.air-from { position: absolute; top: 5em; left: 2.1em; max-width: 44%; display: grid; gap: 0.05em; font-size: 0.85em; line-height: 1.3; }
.air-from span, .air-to span { font-size: 0.7em; letter-spacing: 0.14em; text-transform: uppercase; color: var(--air-label); font-weight: 500; }
.air-from b { font-family: var(--display); font-weight: 500; font-size: 1.35em; line-height: 1.2; overflow-wrap: anywhere; }
.air-from em { font-style: normal; color: var(--air-label); }
.air-to { position: absolute; left: 46%; top: 46%; width: 46%; display: grid; line-height: 1.4; }
.air-to b, .air-to em { padding: 0.28em 0 0.12em; border-bottom: 1px solid rgb(46 41 32 / 0.3); font-style: normal; }
.air-to b { font-family: var(--display); font-weight: 500; font-size: 1.5em; line-height: 1.15; }
.air-stamp {
  position: absolute;
  top: 1.5em;
  right: 1.6em;
  width: 5.6em;
  opacity: 0;
  visibility: hidden;
  transform-origin: 60% 40%;
  filter: drop-shadow(0 0.08em 0.14em rgb(60 40 0 / 0.3));
}
.air-postmark { position: absolute; top: 2.6em; right: 0.4em; width: 11.5em; opacity: 0; visibility: hidden; mix-blend-mode: multiply; transform-origin: 23% 50%; }
.air-stamp svg, .air-postmark svg { display: block; width: 100%; height: auto; }
.air-env svg text { font-family: var(--body); }
.air-env.portrait .air-label { top: 1.4em; left: 1.4em; }
.air-env.portrait .air-from { top: 4.9em; left: 1.65em; max-width: 62%; }
.air-env.portrait .air-to { left: 12%; top: 50%; width: 76%; }