:root {
    font-family: Tahoma, Verdana, Arial, sans-serif;
    color: #172d45;
    background: #dce9f5;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 24px 12px;
    background:
        linear-gradient(180deg, #8bb8e3 0, #dce9f5 240px, #edf3fa 100%);
    min-height: 100vh;
    font-size: 13px;
}

.site-shell {
    max-width: 920px;
    margin: 0 auto;
    border: 1px solid #6688ad;
    background: #f4f7fb;
    box-shadow: 0 4px 18px #42648655;
}

.masthead {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px;
    color: white;
    background: linear-gradient(180deg, #4198df, #07539d);
    border-bottom: 3px solid #003d79;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 52px;
    height: 52px;
    flex: 0 0 52px;
    font-size: 32px;
    font-weight: bold;
    font-style: italic;
    background: linear-gradient(135deg, #ffffff, #b8dfff);
    color: #07539d;
    border: 2px outset #d9ecff;
    text-shadow: 1px 1px #fff;
}

.brand-copy h1 {
    margin: 0;
    font-size: 19px;
    letter-spacing: 1.4px;
}

.brand-copy p {
    margin: 5px 0 0;
    font-size: 10px;
    letter-spacing: 2px;
}

.version-stamp {
    margin-left: auto;
    padding: 7px 9px;
    border: 1px solid #9bc9f1;
    background: #064680;
    font-weight: bold;
    white-space: nowrap;
}

.navigation {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    padding: 0 12px;
    background: linear-gradient(#fdfefe, #d2deeb);
    border-bottom: 1px solid #a3b6ca;
}

.navigation a {
    display: block;
    padding: 13px 15px;
    color: #064f91;
    font-size: 11px;
    font-weight: bold;
    text-decoration: none;
}

.navigation a:hover,
.navigation a:focus {
    background: #e2efff;
    text-decoration: underline;
}

main {
    padding: 18px;
}

.welcome-panel {
    padding: 22px;
    margin-bottom: 18px;
    color: white;
    background: linear-gradient(135deg, #176db5, #073a75);
    border: 1px solid #0a3769;
    box-shadow: inset 1px 1px #75b9ef;
}

.eyebrow {
    font-size: 10px;
    letter-spacing: 2px;
    color: #c5e5ff;
}

.welcome-panel h2 {
    margin: 10px 0;
    font-size: 28px;
}

.welcome-panel > p:not(.eyebrow) {
    line-height: 1.7;
    max-width: 620px;
}

.system-note {
    display: inline-block;
    padding: 8px 10px;
    margin-top: 8px;
    background: #052e5d;
    border: 1px solid #5899d4;
    font-size: 11px;
}

.status-light {
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 7px;
    border-radius: 50%;
    background: #7de69a;
    box-shadow: 0 0 5px #7de69a;
}

.window {
    margin-bottom: 18px;
    background: #ece9d8;
    border: 1px solid #7c8da2;
    box-shadow: 2px 3px 0 #8296ab55;
}

.window-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 9px 12px;
    color: white;
    font-weight: bold;
    background: linear-gradient(180deg, #368fe0, #0753a5);
    border-bottom: 1px solid #174c84;
}

.window-controls {
    font-size: 15px;
    font-weight: bold;
}

.window-content {
    padding: 20px;
}

.window-content h3,
.info-panel h3 {
    margin-top: 0;
    color: #064e8e;
}

.muted {
    color: #596b7d;
    line-height: 1.6;
}

.field-label {
    display: block;
    margin: 20px 0 7px;
    font-size: 10px;
    font-weight: bold;
    letter-spacing: 1px;
}

input[type="file"] {
    width: 100%;
    padding: 10px;
    color: #243d57;
    background: white;
    border: 1px solid #8c9daf;
    box-shadow: inset 1px 1px 2px #b5c0cc;
}

.file-info {
    margin-top: 8px;
    color: #52677c;
    overflow-wrap: anywhere;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0;
}

.classic-button,
.download-button {
    display: inline-block;
    padding: 10px 16px;
    border: 1px solid #7c8da0;
    border-radius: 3px;
    color: #173653;
    background: linear-gradient(#ffffff, #d8e1eb);
    box-shadow: inset 1px 1px #fff, 1px 2px 0 #a6b4c2;
    font-family: inherit;
    font-size: 12px;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
}

.classic-button:hover:not(:disabled),
.download-button:hover {
    background: linear-gradient(#ffffff, #c3def8);
    border-color: #357bb6;
}

.classic-button:active:not(:disabled) {
    box-shadow: inset 1px 1px 3px #8798aa;
    transform: translateY(1px);
}

.classic-button.primary {
    color: white;
    background: linear-gradient(#4198e5, #07549d);
    border-color: #06457f;
    box-shadow: inset 1px 1px #83c3f5;
}

.classic-button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.output-panel {
    margin-top: 22px;
    border: 1px solid #8495a8;
    background: #fff;
    box-shadow: inset 1px 1px 3px #c7d0d9;
}

.output-heading {
    padding: 8px 10px;
    color: #fff;
    background: linear-gradient(#6c8198, #43596f);
    font-size: 10px;
    font-weight: bold;
    letter-spacing: 1px;
}

#compiler-output {
    min-height: 125px;
    max-height: 300px;
    overflow: auto;
    padding: 14px;
    margin: 0;
    color: #193b26;
    background: #fbfdfb;
    font-family: "Courier New", monospace;
    font-size: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.download-button {
    margin-top: 16px;
    color: #fff;
    background: linear-gradient(#42a85c, #197735);
    border-color: #17642e;
    box-shadow: inset 1px 1px #9de4ac;
}

[hidden] {
    display: none !important;
}

.window-status {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 12px;
    color: #455b70;
    background: linear-gradient(#e9eef4, #d4dee9);
    border-top: 1px solid #b5c3d1;
    font-size: 10px;
}

.info-panel {
    margin-top: 18px;
    padding: 18px;
    background: linear-gradient(#fff, #edf3f9);
    border: 1px solid #c0cedc;
    box-shadow: inset 1px 1px #fff;
}

.info-panel p {
    line-height: 1.7;
}

.info-panel a {
    color: #075ca6;
}

footer {
    padding: 15px 18px;
    text-align: center;
    color: #52677c;
    background: #e0e8f1;
    border-top: 1px solid #bac9d8;
    font-size: 10px;
    line-height: 1.6;
}

@media (max-width: 560px) {
    body {
        padding: 0;
    }

    .brand-copy h1 {
        font-size: 15px;
    }

    .brand-copy p {
        letter-spacing: 1px;
    }

    .version-stamp {
        font-size: 10px;
        padding: 5px;
    }

    main {
        padding: 10px;
    }

    .welcome-panel,
    .window-content {
        padding: 15px;
    }

    .welcome-panel h2 {
        font-size: 23px;
    }
}