.ai-mail-app {
  --mail-bg: #071c14;
  --mail-panel: #0d291e;
  --mail-panel-2: #113326;
  --mail-ink: #f7f1e4;
  --mail-muted: #a7b9ae;
  --mail-line: rgba(177, 210, 190, .18);
  --mail-gold: #f4bd55;
  --mail-mint: #79d7aa;
  min-width: 0;
  overflow: hidden;
  padding: clamp(24px, 4.2vw, 64px);
  color: var(--mail-ink);
  background: radial-gradient(760px 440px at 94% 1%, rgba(57, 151, 108, .18), transparent 65%), radial-gradient(rgba(244, 189, 85, .055) 1px, transparent 1.5px), var(--mail-bg);
  background-size: auto, 20px 20px, auto;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.ai-mail-app *, .ai-mail-app *::before, .ai-mail-app *::after { box-sizing: border-box; }
.ai-mail-app button, .ai-mail-app input, .ai-mail-app select, .ai-mail-app textarea { font: inherit; }
.ai-mail-app .hidden { display: none !important; }

.mail-intro { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(290px, .65fr); gap: clamp(28px, 6vw, 86px); align-items: end; max-width: 1420px; margin: 0 auto clamp(32px, 5vw, 62px); }
.mail-eyebrow { margin: 0 0 16px; color: var(--mail-gold); font-size: .74rem; font-weight: 850; letter-spacing: .19em; text-transform: uppercase; }
.mail-intro h1 { max-width: 960px; margin: 0; color: var(--mail-ink); font: 600 clamp(2.8rem, 5.8vw, 6.2rem)/.96 Georgia, "Times New Roman", serif; letter-spacing: -.055em; }
.mail-intro h1 em { color: var(--mail-gold); font-weight: 500; }
.mail-lede { max-width: 760px; margin: clamp(20px, 3vw, 32px) 0 0; color: #c1cec6; font-size: clamp(.98rem, 1.35vw, 1.16rem); line-height: 1.72; }
.mail-facts { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; list-style: none; border: 1px solid var(--mail-line); border-radius: 18px; }
.mail-facts li { display: grid; justify-items: center; gap: 6px; min-width: 0; padding: 22px 10px; border-right: 1px solid var(--mail-line); text-align: center; }
.mail-facts li:last-child { border-right: 0; }
.mail-facts strong { color: var(--mail-ink); font-size: clamp(1.2rem, 2.2vw, 1.8rem); }
.mail-facts span { color: var(--mail-muted); font-size: .65rem; }

.mail-composer { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(18px, 2.4vw, 30px); max-width: 1420px; margin: 0 auto; color: var(--mail-ink); }
.mail-card { min-width: 0; padding: clamp(20px, 3vw, 36px); background: linear-gradient(150deg, rgba(17, 51, 37, .97), rgba(8, 31, 22, .98)); border: 1px solid var(--mail-line); border-radius: clamp(18px, 2vw, 28px); box-shadow: 0 30px 60px -48px #000; }
.mail-section-heading { display: flex; gap: 13px; align-items: flex-start; margin-bottom: 28px; }
.mail-section-heading > span { display: grid; place-items: center; flex: 0 0 38px; width: 38px; height: 38px; color: #382904; background: linear-gradient(145deg, #ffd77e, var(--mail-gold)); border-radius: 50%; font-size: .69rem; font-weight: 900; }
.mail-section-heading h2 { margin: 0; color: var(--mail-ink); font: 600 clamp(1.35rem, 2vw, 1.8rem)/1.15 Georgia, serif; letter-spacing: -.02em; }
.mail-section-heading p { margin: 5px 0 0; color: var(--mail-muted); font-size: .76rem; line-height: 1.5; }

.form-group { min-width: 0; margin: 0 0 18px; }
.form-group > label, .choice-fieldset > legend, .field-label-row label { display: flex; align-items: center; gap: 8px; margin: 0 0 8px; color: var(--mail-ink); font-size: .73rem; font-weight: 800; letter-spacing: .02em; }
.form-group > label b { padding: 3px 6px; color: #3b2a06; background: var(--mail-gold); border-radius: 999px; font-size: .52rem; letter-spacing: .04em; text-transform: uppercase; }
.form-group > label small { color: var(--mail-muted); font-size: .63rem; font-weight: 500; }
.ai-mail-app textarea, .ai-mail-app input[type="text"], .ai-mail-app input[type="url"], .ai-mail-app input[type="number"], .ai-mail-app select { width: 100%; min-width: 0; padding: 12px 13px; color: #edf6f0; background: rgba(4, 21, 14, .68); border: 1px solid rgba(177, 210, 190, .21); border-radius: 11px; outline: 0; }
.ai-mail-app textarea { display: block; resize: vertical; line-height: 1.58; }
.ai-mail-app input::placeholder, .ai-mail-app textarea::placeholder { color: #70877a; opacity: 1; }
.ai-mail-app select { appearance: auto; color-scheme: dark; }
.ai-mail-app textarea:focus, .ai-mail-app input[type="text"]:focus, .ai-mail-app input[type="url"]:focus, .ai-mail-app input[type="number"]:focus, .ai-mail-app select:focus { border-color: var(--mail-mint); box-shadow: 0 0 0 3px rgba(121, 215, 170, .11); }
.field-note { display: block; margin-top: 7px; color: var(--mail-muted); font-size: .65rem; line-height: 1.45; }

.choice-fieldset { padding: 0; border: 0; }
.choice-fieldset > legend { padding: 0; }
.segmented-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.segmented-options label { position: relative; min-width: 0; cursor: pointer; }
.segmented-options input { position: absolute; opacity: 0; pointer-events: none; }
.segmented-options span { display: grid; gap: 3px; min-height: 66px; padding: 13px 14px; color: var(--mail-muted); background: rgba(4, 21, 14, .42); border: 1px solid var(--mail-line); border-radius: 12px; transition: border-color .2s, background .2s, transform .2s; }
.segmented-options b { color: var(--mail-ink); font-size: .77rem; }
.segmented-options small { font-size: .63rem; }
.segmented-options input:checked + span { color: #cce9da; background: rgba(58, 139, 101, .2); border-color: var(--mail-mint); box-shadow: inset 3px 0 var(--mail-mint); }
.segmented-options input:focus-visible + span { outline: 3px solid rgba(244, 189, 85, .35); outline-offset: 2px; }
.segmented-options label:hover span { transform: translateY(-1px); }

.compact-grid, .details-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; }
.field-label-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 8px; }
.field-label-row label { margin: 0; }
.field-label-row output { color: var(--mail-gold); font-size: .7rem; font-weight: 800; }
.range-container { display: grid; grid-template-columns: minmax(0, 1fr) 85px; gap: 13px; align-items: center; }
.range-container input[type="range"] { width: 100%; accent-color: var(--mail-gold); cursor: pointer; }
.range-container input[type="number"] { text-align: center; }

.person-card { min-width: 0; margin: 0 0 18px; padding: 15px; background: rgba(4, 21, 14, .35); border: 1px solid var(--mail-line); border-radius: 14px; }
.person-card legend { padding: 0 7px 0 0; color: var(--mail-ink); font-size: .75rem; font-weight: 800; }
.person-card legend span { display: inline-grid; place-items: center; min-width: 30px; height: 22px; margin-right: 6px; padding: 0 7px; color: #362706; background: var(--mail-gold); border-radius: 999px; font-size: .56rem; text-transform: uppercase; }
.details-grid label { display: grid; gap: 6px; min-width: 0; color: var(--mail-muted); font-size: .66rem; }
.details-grid .wide { grid-column: 1 / -1; }

.html-options { margin-top: 18px; padding: 17px; background: rgba(244, 189, 85, .06); border: 1px solid rgba(244, 189, 85, .26); border-radius: 14px; }
.html-options-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; margin-bottom: 15px; }
.html-options-heading strong { color: var(--mail-gold); font-size: .79rem; }
.html-options-heading span { color: var(--mail-muted); font-size: .62rem; }

.human-check { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr auto minmax(180px, .35fr); gap: 20px; align-items: center; padding: 20px 24px; background: #173529; border: 1px solid rgba(244, 189, 85, .42); border-radius: 17px; }
.human-check strong { color: var(--mail-ink); font-size: .84rem; }
.human-check p { margin: 3px 0 0; color: var(--mail-muted); font-size: .68rem; }
.human-check label { display: flex; align-items: center; gap: 8px; color: var(--mail-ink); font-size: .73rem; }
.human-check label:last-child { display: grid; grid-template-columns: auto 90px; }
.human-check input[type="checkbox"] { width: 19px; height: 19px; accent-color: var(--mail-mint); }

.submit-row { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 20px 24px; background: linear-gradient(110deg, #143829, #102d21); border: 1px solid var(--mail-line); border-radius: 17px; }
.submit-row > div { display: grid; gap: 4px; }
.submit-row strong { color: var(--mail-ink); font: 600 1.08rem Georgia, serif; }
.submit-row span { color: var(--mail-muted); font-size: .68rem; }
.btn-submit, .btn-copy { display: inline-flex; align-items: center; justify-content: center; gap: 14px; border: 0; cursor: pointer; font-weight: 850; transition: transform .2s, filter .2s, opacity .2s; }
.btn-submit { flex: 0 0 auto; min-width: 200px; padding: 13px 17px; color: #342605; background: linear-gradient(145deg, #ffd77e, var(--mail-gold)); border-radius: 999px; }
.btn-submit span { color: #342605; font-size: .78rem; }
.btn-submit b { font-size: 1rem; }
.btn-submit:hover, .btn-copy:hover { transform: translateY(-2px); filter: brightness(1.05); }
.btn-submit:disabled { opacity: .5; cursor: wait; transform: none; }

.mail-result { max-width: 1420px; margin: clamp(22px, 3vw, 36px) auto 0; padding: clamp(20px, 3vw, 34px); color: var(--mail-ink); background: #f7f1e4; border: 1px solid #e5d6b8; border-radius: clamp(18px, 2vw, 26px); box-shadow: 0 28px 65px -46px #000; }
.mail-result header { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 18px; }
.mail-result header p { margin: 0 0 4px; color: #887044; font-size: .64rem; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
.mail-result h2 { margin: 0; color: #153226; font: 600 clamp(1.4rem, 2.4vw, 2rem)/1.15 Georgia, serif; }
.mail-result pre { max-width: 100%; max-height: 520px; margin: 0; overflow: auto; padding: clamp(16px, 2.5vw, 26px); color: #243c32; white-space: pre-wrap; overflow-wrap: anywhere; background: #fffdf8; border: 1px solid #e6ddcb; border-radius: 13px; }
.mail-result code { font: .83rem/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.btn-copy { padding: 11px 15px; color: #f7f1e4; background: #174c37; border-radius: 999px; font-size: .73rem; }
.btn-copy b { font-size: 1rem; }
.result-note { margin: 13px 0 0; color: #756d60; font-size: .66rem; line-height: 1.5; }
.loading-message { margin-bottom: 16px; padding: 11px 13px; color: #4b3708; background: #f4d68f; border: 1px solid #e9b74b; border-radius: 9px; font-size: .73rem; font-weight: 700; }

@media (max-width: 980px) {
  .mail-intro { grid-template-columns: 1fr; gap: 24px; }
  .mail-facts { max-width: 520px; }
  .mail-composer { grid-template-columns: 1fr; }
  .human-check, .submit-row { grid-column: 1; }
}

@media (max-width: 620px) {
  .ai-mail-app { padding: 23px 13px 30px; }
  .mail-intro { margin-bottom: 24px; }
  .mail-intro h1 { font-size: clamp(2.55rem, 13.5vw, 4.25rem); }
  .mail-lede { margin-top: 18px; }
  .mail-facts li { padding: 15px 6px; }
  .mail-facts span { font-size: .58rem; }
  .mail-card { padding: 18px 13px; border-radius: 18px; }
  .mail-section-heading { margin-bottom: 22px; }
  .compact-grid, .details-grid { grid-template-columns: 1fr; }
  .details-grid .wide { grid-column: auto; }
  .segmented-options { gap: 7px; }
  .segmented-options span { min-height: 62px; padding: 11px; }
  .range-container { grid-template-columns: minmax(0, 1fr) 76px; }
  .human-check { grid-template-columns: 1fr; gap: 13px; padding: 18px; }
  .human-check label:last-child { grid-template-columns: minmax(0, 1fr) 90px; }
  .submit-row, .mail-result header { align-items: stretch; flex-direction: column; }
  .btn-submit, .btn-copy { width: 100%; min-width: 0; }
  .mail-result { padding: 17px 13px; }
}

@media (max-width: 360px) {
  .mail-facts { grid-template-columns: 1fr; }
  .mail-facts li { border-right: 0; border-bottom: 1px solid var(--mail-line); }
  .mail-facts li:last-child { border-bottom: 0; }
  .segmented-options { grid-template-columns: 1fr; }
}