:root {
    --accent:#0b5ed7;
    --muted:#666;
    --card:#fff;
    --bg:#f7f9fc;
    --danger:#d9534f;
    --success:#198754;
    --text:#0b1726;
    --input-bg:#fbfeff;
    --border:#e6eef9;
}

:root.dark {
    --background:#080808;
    --accent:#653d3b9e;
    --text:#ced4da;
    --muted:#b5b5b5;
    --icons:#ced4da;
    --border:#1a1a1a;
    --card:#111;
    --input-bg:#0d0d0d;
    --bg:#000;
}

html,body {
    height:100%;
    margin:0;
    font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial;
}

body {
    background: var(--bg);
    padding: 24px;
    color: var(--text);
    transition: 0.4s ease;
}

:root.dark body {
    background-color: var(--background);
    background-image: url('../assets/images/topography.svg');
    background-size: cover;
}

.wrap {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.card {
    background: var(--card);
    box-shadow: 0 8px 22px rgba(12,40,70,0.06);
    border-radius: 12px;
    padding: 18px;
    margin-bottom: 16px;
    transition: 0.3s ease;
    flex: 1;
}

:root.dark .card {
    box-shadow: 0 0 0 transparent;
    border: 1px solid var(--border);
}

h1 {
    font-size: 22px;
    margin: 0 0 14px 0;
    font-weight: 700;
    color: var(--text);
}

.theme-toggle {
    background: var(--accent);
    color: white;
    border: 0;
    padding: 8px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    float: right;
    margin-bottom: 12px;
    box-shadow: 0 6px 16px rgba(0,0,0,0.18);
}

.section-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--accent);
}

label {
    display: block;
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 6px;
}

input[type="text"], input[type="number"], textarea {
    width:100%;
    padding:10px 12px;
    border-radius:8px;
    border:1px solid var(--border);
    font-size:14px;
    background:var(--input-bg);
    color:var(--text);
    box-sizing:border-box;
    margin-bottom:12px;
}

textarea {
    resize: vertical;
}

.controls {
    display:flex;
    gap:10px;
    flex-wrap:wrap;
    margin-top:8px;
}

.btn {
    background:var(--accent);
    color:white;
    border:0;
    padding:10px 14px;
    border-radius:8px;
    cursor:pointer;
    font-weight:600;
    white-space:nowrap;
}

.btn.secondary {
    background:transparent;
    color:var(--accent);
    border:1px solid var(--accent);
}

.output {
    margin-top:12px;
    font-size:14px;
    word-break:break-word;
    color:var(--text);
}

.remark-block {
    margin-top:10px;
    padding:12px;
    border-radius:10px;
    background:var(--input-bg);
    border:1px solid var(--border);
    display:flex;
    gap: 12px;
    justify-content:space-between;
    align-items:center;
    color:var(--text);
}

.remark-block span {
    flex:1;
}

.copy-btn {
    background:#0b5ed7;
    color:white;
    padding:6px 10px;
    font-size:12px;
    border-radius:6px;
    cursor:pointer;
    border:none;
    white-space:nowrap;
    flex-shrink:0;
}

:root.dark .copy-btn {
    background:#653d3b9e;
}

.alert {
    position:fixed;
    bottom:20px;
    right:20px;
    background:#0b5ed7;
    color:white;
    padding:10px 16px;
    border-radius:8px;
    font-weight:500;
    display:none;
}

:root.dark .alert {
    background:#653d3b9e;
}

.alert.fade-out {
    opacity:0;
    transition:opacity 1s ease-out;
}

@media(max-width:780px){
    .wrap {
        flex-direction: column;
    }
    .remark-block {
        flex-direction:column;
        gap:10px;
        align-items:flex-start;
    }
    .theme-toggle {
        float: none;
        width: 100%;
    }
}