main.css

/* ════════════════════════════════════════════════════════
   FRUTIGER AERO — Frutiger Aero Archive tutorials
   Tile  : #314DFF → #00D9FF  (aero_tile.css)
   Button: #343434 → #1F1F1F  (aero_button.css)
   ════════════════════════════════════════════════════════ */

:root {
    /* ── aero_tile.css ── */
    --tile-top:    #314DFF;
    --tile-bottom: #00D9FF;
    --tile-border: rgba(0, 0, 0, 0.2);
    --gloss-hi:    rgba(217, 217, 217, 0.50);   /* Ellipse 1 top  */
    --gloss-lo:    rgba(115, 115, 115, 0.04);   /* Ellipse 1 fade */

    /* ── aero_button.css ── */
    --btn-top: #343434;
    --btn-mid: #1F1F1F;
    --btn-bot: #3D3D3D;

    /* ── desktop background ── */
    --sky-top:    #b0dfff;
    --sky-bottom: #1a6eb5;

    /* ── content / text ── */
    --content-bg:   rgba(255, 255, 255, 0.93);
    --text:         #0a1628;
    --link:         #0044cc;
    --link-visited: #5500aa;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── BASE ── */
body {
    background: linear-gradient(170deg, var(--sky-top) 0%, var(--sky-bottom) 100%);
    font-family: "Segoe UI", Calibri, Tahoma, Arial, sans-serif;
    font-size: 13px;
    color: var(--text);
    min-height: 100vh;
    padding-bottom: 56px;   /* room for taskbar */
}

/* ══════════════════════════════════════════════
   DESKTOP CANVAS
   ══════════════════════════════════════════════ */
.desktop {
    position: relative;
    width: 880px;
    min-height: 700px;
    margin: 30px auto 50px;
}

/* ══════════════════════════════════════════════
   WINDOW  — aero_tile.css
   ══════════════════════════════════════════════ */
.window {
    position: absolute;
    border-radius: 15px;
    border: 1px solid var(--tile-border);
    /* Blue → cyan gradient from aero_tile.css Rectangle 1 */
    background: linear-gradient(180deg, var(--tile-top) 50.48%, var(--tile-bottom) 100%);
    /* Inner edge shadows from aero_tile.css Mask group */
    box-shadow:
        inset 0px -4px 0px rgba(0, 0, 0, 0.25),
        inset 0px  4px 0px rgba(255, 255, 255, 0.25),
        0px 8px 20px rgba(0, 0, 0, 0.35);
    overflow: hidden;   /* clips the gloss ellipse and content to border-radius */
}

/* Glossy ellipse overlay — aero_tile.css "Ellipse 1"
   Placed on the top half of each window; fades to near-transparent.
   z-index 1 keeps it under the titlebar text and content. */
.window::before {
    content: '';
    position: absolute;
    top: -20%;
    left: -20%;
    width: 140%;
    height: 65%;
    background: linear-gradient(180deg,
        var(--gloss-hi) 23.46%,
        var(--gloss-lo) 100%
    );
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
}

/* ══════════════════════════════════════════════
   TITLE BAR
   Transparent so the blue gradient + gloss show through.
   z-index 2 keeps text/buttons above the ellipse (z-index 1).
   ══════════════════════════════════════════════ */
.titlebar {
    position: relative;
    z-index: 2;
    height: 30px;
    background: transparent;
    color: #ffffff;
    font-size: 12px;
    font-weight: 700;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.65);
    padding: 0 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.titlebar > span {
    display: flex;
    align-items: center;
    gap: 5px;
    overflow: hidden;
    white-space: nowrap;
}

.titlebar-icon { font-size: 14px; line-height: 1; flex-shrink: 0; }

.window-sep {
    position: relative;
    z-index: 2;
    height: 1px;
    background: rgba(0, 0, 0, 0.2);
}

/* ══════════════════════════════════════════════
   TITLEBAR BUTTONS — aero_button.css (scaled down)
   ══════════════════════════════════════════════ */
.titlebar-buttons { display: flex; gap: 4px; flex-shrink: 0; margin-left: 6px; }

.titlebar-buttons button {
    width: 22px;
    height: 16px;
    font-size: 9px;
    font-family: inherit;
    font-weight: bold;
    color: #ffffff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.7);
    /* aero_button.css — normal state */
    background: linear-gradient(180deg, var(--btn-top) 0%, var(--btn-mid) 50%, var(--btn-bot) 100%);
    box-shadow:
        0px 4px 6px rgba(0, 0, 0, 0.30),
        inset 0px -2px 1px rgba(0,   0,   0,   0.4),
        inset 0px  2px 1px rgba(255, 255, 255, 0.3);
    transition: filter 0.1s;
}

.titlebar-buttons button:hover  { filter: brightness(1.25); }

/* aero_button_pressed_in.css — inset values drop from 2px to 1px */
.titlebar-buttons button:active {
    box-shadow:
        0px 4px 6px rgba(0, 0, 0, 0.30),
        inset 0px -1px 1px rgba(0,   0,   0,   0.4),
        inset 0px  1px 1px rgba(255, 255, 255, 0.3);
    filter: brightness(0.85);
}

/* ══════════════════════════════════════════════
   CONTENT
   Opaque white so it covers the blue gradient + gloss below.
   z-index 2 to sit above the ::before ellipse.
   ══════════════════════════════════════════════ */
.content {
    position: relative;
    z-index: 2;
    background: var(--content-bg);
    padding: 10px 12px;
    border-radius: 0 0 13px 13px;
}

.content p             { line-height: 1.65; margin-bottom: 6px; }
.content p:last-child  { margin-bottom: 0; }
.content ul            { padding-left: 18px; list-style-type: disc; }
.content li            { line-height: 1.7; }
.content a             { color: var(--link); }
.content a:visited     { color: var(--link-visited); }
.content del           { color: #888; }

/* ══════════════════════════════════════════════
   SPOILER
   White text on near-white background = invisible.
   Revealed in Aero cyan on selection.
   ══════════════════════════════════════════════ */
.spoiler-text { color: #ffffff; }
.spoiler-text::selection {
    color: var(--text);
    background-color: #00D9FF;
}

/* ══════════════════════════════════════════════
   MOBILE
   ══════════════════════════════════════════════ */
@media (max-width: 900px) {
    body { padding-bottom: 0; }

    .desktop {
        position: static;
        width: 100%;
        min-height: unset;
        margin: 0;
        padding: 10px;
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    .window {
        position: static;
        width: 100% !important;
    }

    .taskbar { display: none; }
}