/* Transferium — enveloppe par avion */

:root {
    --paper: #E9EEF6;
    --card: #FFFFFF;
    --ink: #16213A;
    --ink-2: #5B6478;
    --rule: #D5DBE6;
    --rule-soft: #EDF0F5;
    --red: #D7382D;
    --blue: #2F5BB7;
    --blue-soft: #F1F5FC;
    --ok: #1F7A4D;
    --display: 'Archivo', 'Arial Narrow', Arial, sans-serif;
    --body: 'IBM Plex Sans', 'Segoe UI', Helvetica, Arial, sans-serif;
    --mono: 'IBM Plex Mono', Consolas, 'Courier New', monospace;
}

* { box-sizing: border-box; }

html { background: var(--paper); }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
    font-family: var(--body);
    font-size: 16px;
    line-height: 1.5;
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
}

/* ---------------------------------------------------------- enveloppe */

.envelope {
    position: relative;
    width: 100%;
    max-width: 560px;
    background: var(--card);
    border-radius: 6px;
    box-shadow:
        0 1px 2px rgba(22, 33, 58, 0.06),
        0 18px 48px -18px rgba(22, 33, 58, 0.28);
    overflow: hidden;
    padding: 0 40px 28px;
}

.airmail {
    position: relative;
    height: 14px;
    margin: 0 -40px 28px;
    background: repeating-linear-gradient(
        135deg,
        var(--rule) 0 22px,
        transparent 22px 30px,
        var(--rule) 30px 52px,
        transparent 52px 60px
    );
    overflow: hidden;
}

.airmail-fill {
    position: absolute;
    inset: 0;
    width: 0;
    background: repeating-linear-gradient(
        135deg,
        var(--red) 0 22px,
        #fff 22px 30px,
        var(--blue) 30px 52px,
        #fff 52px 60px
    );
    background-size: 84.85px 100%;
    transition: width 0.25s ease-out;
}

.airmail-bottom {
    height: 8px;
    margin: 28px -40px 0;
    background: repeating-linear-gradient(
        135deg,
        var(--red) 0 22px,
        #fff 22px 30px,
        var(--blue) 30px 52px,
        #fff 52px 60px
    );
}

/* État initial : le liseré du haut est plein, il devient jauge pendant l'envoi. */
.envelope:not(.is-sending) .airmail-fill { width: 100%; }

.is-sending .airmail-fill {
    animation: transit 1.4s linear infinite;
}

@keyframes transit {
    to { background-position: 84.85px 0; }
}

@media (prefers-reduced-motion: reduce) {
    .is-sending .airmail-fill { animation: none; }
    .airmail-fill { transition: none; }
}

/* ------------------------------------------------------------- en-tête */

.head { margin: 0 0 24px; }

.eyebrow {
    margin: 0 0 4px;
    font-family: var(--display);
    font-variation-settings: 'wdth' 80;
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-2);
}

.title {
    margin: 0 0 8px;
    font-family: var(--display);
    font-variation-settings: 'wdth' 92;
    font-weight: 800;
    font-size: 38px;
    line-height: 1.05;
    letter-spacing: -0.01em;
}

.title-email {
    font-size: 26px;
    font-variation-settings: 'wdth' 88;
    word-break: break-all;
}

.lead {
    margin: 0;
    color: var(--ink-2);
}

/* ----------------------------------------------------------- formulaire */

.row {
    display: grid;
    grid-template-columns: 64px 1fr;
    align-items: baseline;
    gap: 12px;
}

.label {
    font-family: var(--display);
    font-variation-settings: 'wdth' 78;
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-2);
}

.label-block {
    display: block;
    margin: 20px 0 6px;
}

.input {
    width: 100%;
    border: 0;
    border-bottom: 1px solid var(--rule);
    border-radius: 0;
    background: transparent;
    padding: 10px 0;
    font: inherit;
    color: var(--ink);
    resize: vertical;
    outline: none;
}

.input::placeholder { color: #A3AAB8; }

.input:focus {
    border-bottom-color: var(--blue);
    box-shadow: 0 1px 0 0 var(--blue);
}

.mono { font-family: var(--mono); font-size: 14px; }

.drop {
    margin: 24px 0 0;
    padding: 30px 20px;
    text-align: center;
    border: 1.5px dashed var(--rule);
    border-radius: 4px;
    cursor: pointer;
    transition: border-color 0.15s, background-color 0.15s;
}

.drop:hover,
.drop:focus-visible,
.drop.is-over {
    border-color: var(--blue);
    background: var(--blue-soft);
}

.drop-main {
    display: block;
    font-family: var(--display);
    font-variation-settings: 'wdth' 92;
    font-weight: 700;
    font-size: 18px;
}

.drop-sub {
    display: block;
    margin-top: 2px;
    font-size: 13px;
    color: var(--ink-2);
}

.files {
    list-style: none;
    margin: 8px 0 0;
    padding: 0;
}

.file {
    display: grid;
    grid-template-columns: 1fr auto 28px;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--rule-soft);
}

.file-name {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--ink);
    text-decoration: none;
}

.file-name:hover { text-decoration: underline; }

.file-size {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--ink-2);
    white-space: nowrap;
}

.file-action {
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--ink-2);
    font: inherit;
    font-size: 16px;
    line-height: 1;
    text-decoration: none;
    cursor: pointer;
}

.file-action:hover,
.file-action:focus-visible {
    background: var(--rule-soft);
    color: var(--ink);
}

.file.is-done .file-action {
    color: var(--ok);
    cursor: default;
    background: transparent;
}

.file.is-done .file-size { color: var(--ok); }

.alert {
    margin: 16px 0 0;
    padding: 8px 12px;
    border-left: 3px solid var(--red);
    background: #FBEFEE;
    color: #8A2119;
    font-size: 14px;
}

.trap {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin: 24px 0 0;
}

.fine {
    font-family: var(--mono);
    font-size: 12.5px;
    color: var(--ink-2);
}

.btn {
    display: inline-block;
    padding: 12px 22px;
    border: 1.5px solid var(--ink);
    border-radius: 3px;
    background: var(--ink);
    color: #fff;
    font-family: var(--display);
    font-variation-settings: 'wdth' 90;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.15s, border-color 0.15s;
}

.btn:hover,
.btn:focus-visible {
    background: var(--blue);
    border-color: var(--blue);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: var(--ink);
    border-color: var(--ink);
}

.btn-ghost {
    background: transparent;
    color: var(--ink);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
    background: var(--blue-soft);
    color: var(--blue);
}

:focus-visible {
    outline: 2px solid var(--blue);
    outline-offset: 3px;
}

.input:focus-visible { outline: none; }

/* --------------------------------------------------------------- états */

.status { margin-top: 24px; }

.status-line {
    margin: 0 0 4px;
    font-family: var(--mono);
    font-size: 15px;
}

#status-pct {
    display: inline-block;
    min-width: 4ch;
    font-weight: 500;
    color: var(--blue);
}

.done .title { font-size: 30px; }

.linkbox {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.linkbox .input { flex: 1; }

.linkbox .btn { padding: 10px 16px; }

.message {
    margin: 0 0 20px;
    padding: 12px 16px;
    border-left: 3px solid var(--blue);
    background: var(--blue-soft);
    font-size: 15px;
}

.foot {
    margin: 20px 0 0;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--ink-2);
    text-align: center;
}

.foot a { color: inherit; }

/* --------------------------------------------------------------- mobile */

@media (max-width: 480px) {
    body { padding: 16px 10px; }
    .envelope { padding: 0 22px 20px; }
    .airmail { margin: 0 -22px 22px; }
    .airmail-bottom { margin: 22px -22px 0; }
    .title { font-size: 32px; }
    .row { grid-template-columns: 1fr; gap: 0; margin-top: 10px; }
    .actions { flex-direction: column; align-items: stretch; }
    .btn { text-align: center; }
    .linkbox { flex-direction: column; align-items: stretch; }
}