sea/frontend/public/style.css

:root {
    /* Neon-night design tokens. */
    --ink: #06070f;            /* darkest base behind the image */
    --text: #f4f6fb;
    --muted: #9aa6c0;
    --accent: #ff4d4d;         /* Wails red */
    --accent-2: #ff2d72;       /* pink, used in gradients */
    --glass: rgba(255, 255, 255, 0.05);
    --glass-strong: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.12);
    --radius: 11px;
    --grad: linear-gradient(135deg, #ff5a4d 0%, #ff2d72 100%);

    /* Golden-ratio spacing scale (φ ≈ 1.618), used for the vertical rhythm. */
    --s-1: 0.618rem;   /* φ⁻¹ */
    --s-2: 1rem;
    --s-3: 1.618rem;   /* φ   */
    --s-4: 2.618rem;   /* φ²  */
    --s-5: 4.236rem;   /* φ³  */

    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
        sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    color-scheme: dark;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
}

* { box-sizing: border-box; }

html {
    background: var(--ink);
}
html, body {
    margin: 0;
    color: var(--text);
}
body {
    overflow-x: hidden;
    /* Nothing in the chrome is selectable (it's an app, not a document); the
       text input opts back in below. */
    -webkit-user-select: none;
    user-select: none;
    /* Drag the window by its background. Interactive controls opt out with
       --wails-draggable: no-drag (the property inherits). */
    --wails-draggable: drag;
}

/* Framework mount nodes (#app / #root) shouldn't affect layout, so the
   body flex centering applies directly to .container. */
#app, #root { display: contents; }

/* Interactive elements: clickable (not draggable) and, for the input, selectable. */
.brand-mark, .brand-badge, .input-box, .btn, .footer-docs, .toast {
    --wails-draggable: no-drag;
}
.input, input[type="text"] {
    -webkit-user-select: text;
    user-select: text;
}

/* ----- Background layer ----------------------------------------------------
   A fixed, full-viewport layer rather than `background-attachment: fixed`
   (which iOS WKWebView ignores / renders janky). A dark gradient is layered
   over the photo so foreground text stays legible. On desktop the gradient is
   weighted to the left, where the content sits. */
.bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        linear-gradient(90deg, rgba(6, 7, 15, 0.94) 0%, rgba(6, 7, 15, 0.78) 32%,
            rgba(6, 7, 15, 0.42) 64%, rgba(6, 7, 15, 0.30) 100%),
        linear-gradient(0deg, rgba(6, 7, 15, 0.70) 0%, rgba(6, 7, 15, 0.10) 45%),
        url("/bg-desktop.jpg") center / cover no-repeat;
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;             /* content area + footer pinned to the bottom */
    /* Respect mobile safe areas (notch / home indicator). No bottom padding:
       the footer sits flush at the bottom edge. */
    /* Wider outer margins on the golden scale (φ² top/right, φ³ left). */
    padding: max(var(--s-4), env(safe-area-inset-top)) max(var(--s-4), env(safe-area-inset-right))
             0 max(var(--s-5), env(safe-area-inset-left));
}

.container {
    flex: 1 0 auto;                     /* fill the space above the footer */
    width: 100%;
    max-width: 540px;
    display: flex;
    flex-direction: column;
    justify-content: center;            /* vertically centre the content */
    align-items: flex-start;
    text-align: left;
}

/* ----- Brand row ----------------------------------------------------------- */
.brand {
    display: flex;
    align-items: center;
    gap: var(--s-2);
    /* No top margin — the content block is vertically centred, so an extra top
       margin would push everything (incl. the input) down. φ² gap below. */
    margin-bottom: var(--s-4);
}
.brand-mark, .brand-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s ease, filter 0.2s ease;
}
.brand-mark:hover, .brand-badge:hover {
    transform: translateY(-2px);
    filter: drop-shadow(0 0 1em rgba(255, 77, 77, 0.45));
}
/* Logo heights sit on the golden scale (φ³ = 4.236rem). The Wails mark carries
   its wordmark, so the badge is one golden step smaller (φ³ ÷ √φ) to keep the
   pair visually balanced. */
.brand-logo { height: var(--s-5); width: auto; display: block; object-fit: contain; }
.brand-badge img { height: calc(var(--s-5) / 1.272); width: auto; display: block; object-fit: contain; }

/* ----- Version badge ------------------------------------------------------- */
.badge {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 1.1rem;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: #ff7a8f;
    background: rgba(255, 45, 114, 0.14);
    border: 1px solid rgba(255, 45, 114, 0.32);
    border-radius: 999px;
}

/* ----- Heading ------------------------------------------------------------- */
.title {
    margin: 0 0 var(--s-2);
    max-width: 100%;
    font-size: clamp(2.5rem, 7.5vw, 3.7rem);
    line-height: 1.05;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text);
    overflow-wrap: break-word;
}
.title-accent {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* The framework word ("JavaScript") crossfades to the entered name on Greet:
   the outgoing word is taken out of flow and fades out while the incoming word
   fades in over the same spot. */
.title-name { position: relative; display: inline-block; }
.title-name-text {
    display: inline-block;
    transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 0.68, 0.2, 1);
}
.title-name-text.is-outgoing { position: absolute; left: 0; top: 0; }
.title-name-text.is-entering { opacity: 0; transform: translateY(0.3em); }   /* rises in from below */
.title-name-text.is-leaving { opacity: 0; transform: translateY(-0.3em); }   /* lifts out upward */

.subtitle {
    margin: 0 0 var(--s-5);
    max-width: 32rem;
    color: var(--muted);
    font-size: clamp(1.05rem, 2.9vw, 1.2rem);
    line-height: 1.55;
}

/* ----- Greet input + button ------------------------------------------------ */
/* Input row and the card below it are sized down so they sit more compact
   under the heading. */
.greet { width: 62%; }

/* Input font is pinned at 16px: iOS Safari/WKWebView zooms the page when an
   input under 16px gains focus, so the whole control is sized around that.
   Tight vertical padding keeps it ~36px tall, icon : control ≈ 1 : φ. */
.input-box {
    display: flex;
    align-items: center;
    gap: 7px;
    width: 100%;
    padding: 4px 5px 4px 11px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    transition: border-color 0.2s ease;
}
.input-box:focus-within { border-color: rgba(255, 77, 77, 0.55); }

.input-icon {
    width: 23px;
    height: 23px;
    flex: 0 0 auto;
    color: var(--muted);
}

.input,
input[type="text"] {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 16px;
    padding: 5px 2px;
    outline: none;
}
.input::placeholder { color: rgba(154, 166, 192, 0.7); }

.btn {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    border: none;
    background: var(--grad);
    color: #fff;
    padding: 6px 15px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 6px 18px rgba(255, 45, 114, 0.35);
    transition: transform 0.1s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}
.btn svg { width: 17px; height: 17px; }
.btn:hover { box-shadow: 0 8px 24px rgba(255, 45, 114, 0.5); }
.btn:active { transform: scale(0.97); }

/* ----- Toast (the reply from Go) ------------------------------------------- */
/* Fixed overlay near the bottom, so showing the greeting never reflows the page.
   The Go-blue badge makes it obvious the string was produced by the Go backend. */
.toast {
    position: fixed;
    /* Top-right with an equal golden-ratio inset (φ = 1.618rem) on both edges,
       clear of the macOS traffic lights (which are on the left). Falls back to
       the notch / safe area when larger. Drops in from just above. */
    top: max(var(--s-3), env(safe-area-inset-top));
    right: max(var(--s-3), env(safe-area-inset-right));
    z-index: 20;
    display: inline-flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    max-width: min(86vw, 420px);
    padding: 11px 16px;
    background: rgba(13, 17, 28, 0.72);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    box-shadow: 0 16px 44px rgba(0, 0, 0, 0.45);
    color: var(--text);
    font-size: 15px;
    line-height: 1.45;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-16px);
    transition: opacity 0.3s ease, transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.toast.is-visible {
    opacity: 1;
    transform: translateY(0);
}
/* Muted, on-palette label so it's clear the string came from the Go backend. */
.toast-label {
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--muted);
}
.toast-msg { min-width: 0; }

/* ----- Footer -------------------------------------------------------------- */
/* Thin bar pinned to the bottom: version far-left, live clock centered. */
.footer-divider {
    width: 100%;
    height: 0;
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin: 0;
}
.footer {
    display: grid;
    grid-template-columns: 1fr auto 1fr;   /* version | clock | spacer */
    align-items: center;
    width: 100%;
    /* keep the bar off the very edge and clear of the home indicator */
    padding: 11px max(0.5rem, env(safe-area-inset-right))
             max(11px, env(safe-area-inset-bottom)) 0;
    color: var(--muted);
    font-size: 12.5px;
}
.footer-version {
    justify-self: start;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    white-space: nowrap;
}
.footer-time {
    justify-self: center;
    display: inline-flex;
    align-items: center;
    gap: 7px;
}
.footer-time svg { width: 19px; height: 19px; opacity: 0.85; }
.footer-docs {
    justify-self: end;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--muted);
    text-decoration: none;
    cursor: pointer;
    white-space: nowrap;
    transition: color 0.2s ease;
}
.footer-docs:hover { color: var(--text); }
.footer-docs svg { width: 17px; height: 17px; }
.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent);
}

/* ----- Mobile -------------------------------------------------------------- */
@media (max-width: 640px) {
    .bg {
        background:
            linear-gradient(0deg, rgba(6, 7, 15, 0.92) 0%, rgba(6, 7, 15, 0.55) 40%,
                rgba(6, 7, 15, 0.45) 100%),
            url("/bg-mobile.jpg") center / cover no-repeat;
    }
    .container { align-items: center; text-align: center; margin: 0 auto; }
    /* Stack the title onto two lines ("Wails +" / "Javascript") like the target. */
    .title-accent { display: block; }
    .subtitle { margin-left: auto; margin-right: auto; }
    /* A touch more width back on small screens so the input stays usable. */
    .greet { width: 86%; }
    /* Trim the surround on a phone, but keep the input at 16px (iOS focus-zoom
       guard) — only the padding/button/icon shrink, not the field's text. */
    .input-box { padding: 3px 4px 3px 10px; gap: 6px; }
    .input-icon { width: 21px; height: 21px; }
    .input { font-size: 16px; padding: 4px 2px; }
    .btn { padding: 5px 13px; font-size: 14px; gap: 5px; }
    .btn svg { width: 16px; height: 16px; }
    /* Three items (version / clock / docs) share a narrow row — shrink to fit. */
    .footer { font-size: 11px; gap: 4px; }
    .footer-time { gap: 5px; }
    .footer-time svg { width: 13px; height: 13px; }
}