* { box-sizing: border-box; }

:root {
    --bg: #101317;
    --panel: #171b21;
    --panel-2: #1d242d;
    --text: #eef2f7;
    --muted: #aab3bf;
    --border: #2a333f;
    --accent: #4da3ff;
    --accent-2: #2f7fd6;
    --success: #173321;
    --error: #411a20;
    --warning: #3d2e00;
    --info-border: #2a4a6e;
}

body.theme-light {
    --bg: #f4f7fb;
    --panel: #ffffff;
    --panel-2: #f8fafc;
    --text: #18212c;
    --muted: #5f6b7a;
    --border: #d9e1ea;
    --accent: #1769cc;
    --accent-2: #0e56ae;
    --success: #eaf8ee;
    --error: #fdecef;
    --warning: #fffce0;
    --info-border: #b3d0f5;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 28px;
    border-bottom: 1px solid var(--border);
    background: var(--panel);
    position: sticky;
    top: 0;
    z-index: 10;
}

.brand {
    color: var(--text);
    text-decoration: none;
    font-size: 22px;
    font-weight: 700;
}

.theme-btn, .search-button, .primary-btn {
    border: none;
    background: var(--accent);
    color: white;
    padding: 12px 18px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
}

.theme-btn:hover, .search-button:hover, .primary-btn:hover { background: var(--accent-2); }

.page-wrap {
    max-width: 1220px;
    margin: 0 auto;
    padding: 28px 20px 48px;
}

.hero {
    text-align: center;
    padding: 34px 0 22px;
}

.hero h1 {
    margin: 0 0 10px;
    font-size: 46px;
}

.hero p {
    margin: 0 auto 24px;
    max-width: 700px;
    color: var(--muted);
    font-size: 18px;
}

.search-form {
    display: flex;
    gap: 12px;
    max-width: 900px;
    margin: 0 auto;
}

.search-input {
    flex: 1;
    padding: 18px 20px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--panel);
    color: var(--text);
    font-size: 18px;
}

.content-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 22px;
    margin-top: 24px;
}

.sidebar-card, .card, .tool-card, .empty-state {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 18px;
}

.sidebar-card {
    padding: 18px;
    position: sticky;
    top: 90px;
}

.sidebar-card h3 { margin-top: 0; margin-bottom: 14px; }

.category-link {
    display: block;
    text-decoration: none;
    color: var(--text);
    padding: 11px 12px;
    border-radius: 12px;
    margin-bottom: 8px;
    border: 1px solid transparent;
}

.category-link:hover { background: var(--panel-2); border-color: var(--border); }
.category-link.active { background: var(--panel-2); border-color: var(--accent); }

.results-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.results-head h2 { margin: 0; }
.results-head span { color: var(--muted); }

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}

.tool-card {
    display: block;
    text-decoration: none;
    color: var(--text);
    padding: 20px;
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.tool-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
}

.tool-card h3 {
    margin: 0 0 8px;
    font-size: 22px;
}

.tool-category {
    display: inline-block;
    margin-bottom: 8px;
    color: var(--accent);
    font-size: 14px;
    font-weight: 700;
}

.tool-card p {
    margin: 0 0 14px;
    color: var(--muted);
    min-height: 48px;
    line-height: 1.45;
}

.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tool-tags span {
    font-size: 13px;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px 10px;
    color: var(--muted);
}

.tool-page h1 { margin-top: 0; margin-bottom: 10px; font-size: 36px; }
.tool-page p { color: var(--muted); margin-bottom: 24px; }

.card { padding: 24px; max-width: 760px; }
.card form { display: grid; gap: 14px; }
.card label { font-weight: 600; }

.card input[type="file"],
.card input[type="text"],
.card select {
    padding: 13px 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel-2);
    color: var(--text);
}

.card small { color: var(--muted); }

.alerts { margin-bottom: 16px; }
.alert { padding: 14px 16px; border-radius: 12px; margin-bottom: 10px; }
.alert.error { background: var(--error); }
.alert.success { background: var(--success); }
.alert.warning { background: var(--warning); }

.info-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 20px 24px;
    max-width: 760px;
    margin-top: 24px;
}
.info-box h3 { margin-top: 0; margin-bottom: 12px; }
.info-box ul { margin: 0; padding-left: 20px; color: var(--muted); }
.info-box li { margin-bottom: 6px; line-height: 1.5; }

.help-text {
    background: var(--panel-2);
    border-left: 4px solid var(--accent);
    border-radius: 0 8px 8px 0;
    padding: 14px 16px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text);
}

.empty-state { padding: 28px; color: var(--muted); text-align: center; }

@media (max-width: 900px) {
    .content-layout { grid-template-columns: 1fr; }
    .sidebar-card { position: static; }
}

@media (max-width: 720px) {
    .topbar { padding: 14px 16px; }
    .hero h1 { font-size: 34px; }
    .search-form { flex-direction: column; }
    .search-button, .theme-btn, .primary-btn { width: 100%; }
}