/* ===================== THEMES ===================== */
:root, [data-theme="default"] {
    --bg-primary: #5b759d;
    --bg-secondary: #5b759d;
    --bg-navbar: #5b759d;
    --border-color: #5b759d;
    --text-primary: #ecf0f1;
    --text-muted: #8b949e;
    --accent: #ff9f43;
    --node-stroke: #2980b9;
    --node-fill-collapsed: #3498db;
    --node-fill-leaf: #ffffff;
    --link-color: #444;
    --btn-bg: #0d1117;
    --btn-hover-bg: #30363d;
    --search-bg: #0d1117;
    --theme-btn-active-bg: #ff9f43;
    --theme-btn-active-color: #0d1117;
}

[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-navbar: #0a0a0a;
    --border-color: #222222;
    --text-primary: #e0e0e0;
    --text-muted: #666666;
    --accent: #ff9f43;
    --node-stroke: #1a6fa8;
    --node-fill-collapsed: #1a6fa8;
    --node-fill-leaf: #cccccc;
    --link-color: #333333;
    --btn-bg: #000000;
    --btn-hover-bg: #1a1a1a;
    --search-bg: #000000;
    --theme-btn-active-bg: #ff9f43;
    --theme-btn-active-color: #000000;
}

[data-theme="white"] {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-navbar: #ffffff;
    --border-color: #d0d0d0;
    --text-primary: #1a1a1a;
    --text-muted: #555555;
    --accent: #e67e22;
    --node-stroke: #2471a3;
    --node-fill-collapsed: #2e86c1;
    --node-fill-leaf: #1a1a1a;
    --link-color: #aaaaaa;
    --btn-bg: #f5f5f5;
    --btn-hover-bg: #eeeeee;
    --search-bg: #f5f5f5;
    --theme-btn-active-bg: #e67e22;
    --theme-btn-active-color: #ffffff;
}
/* =================================================== */

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg-primary);
    font-family: 'Segoe UI', sans-serif;
    overflow: hidden;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    height: 100vh;
    transition: background 0.3s, color 0.3s;
}

/* ---- NAVBAR ---- */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-navbar);
    border-bottom: 1px solid var(--border-color);
    padding: 0 16px;
    height: 56px;
    flex-shrink: 0;
    z-index: 200;
    transition: background 0.3s, border-color 0.3s;
}

.navbar-logo {
    height: 38px;
    display: block;
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-btn {
    background: var(--btn-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-family: 'Segoe UI', sans-serif;
    transition: all 0.2s;
    white-space: nowrap;
}

.nav-btn:hover {
    background: var(--btn-hover-bg);
    border-color: var(--accent);
    color: var(--accent);
}

.nav-btn svg { stroke: currentColor; }

/* ---- SEARCH ---- */
.search-wrap {
    display: flex;
    align-items: center;
    gap: 0;
}

.search-input {
    width: 0;
    opacity: 0;
    padding: 0;
    border: none;
    background: var(--search-bg);
    color: var(--text-primary);
    font-size: 13px;
    font-family: 'Segoe UI', sans-serif;
    border-radius: 6px 0 0 6px;
    transition: width 0.35s ease, opacity 0.35s ease, padding 0.35s ease, border 0.2s;
    outline: none;
    height: 34px;
}

.search-input.open {
    width: 180px;
    opacity: 1;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-right: none;
}

.search-input.open:focus {
    border-color: var(--accent);
}

.search-toggle {
    border-radius: 6px;
    transition: all 0.2s;
}

.search-input.open + .search-toggle {
    border-radius: 0 6px 6px 0;
}

/* ---- THEME BUTTONS ---- */
.theme-btns {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--btn-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 3px;
    transition: background 0.3s, border-color 0.3s;
}

.theme-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    width: 28px;
    height: 28px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    line-height: 1;
}

.theme-btn:hover {
    background: var(--btn-hover-bg);
    color: var(--accent);
}

.theme-btn.active {
    background: var(--theme-btn-active-bg);
    color: var(--theme-btn-active-color);
}

/* ---- MAIN LAYOUT ---- */
.main-container {
    display: flex;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
}

#tree-container {
    flex: 1;
    width: 100%;
    background: var(--bg-primary);
    overflow: hidden;
    position: relative;
    transition: background 0.3s;
}

svg {
    width: 100%;
    height: 100%;
    display: block;
}

#info-panel {
    height: 30vh;
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 15px;
    overflow-y: auto;
    border-top: 1px solid var(--border-color);
    transition: background 0.3s, color 0.3s, border-color 0.3s;
}

/* Desktop */
@media (min-width: 1024px) {
    .main-container {
        flex-direction: row;
    }
    #tree-container {
        flex: 0 0 75%;
        height: 100%;
        border-right: 1px solid var(--border-color);
    }
    #info-panel {
        flex: 0 0 25%;
        height: 100%;
        border-top: none;
    }
}

/* ---- D3 Elements ---- */
.node circle { stroke: var(--node-stroke); stroke-width: 3px; cursor: pointer; }
.node text   { font-size: 14px; fill: var(--text-primary); font-weight: 500; pointer-events: none; }
.link        { fill: none; stroke: var(--link-color); stroke-width: 2px; }
.spark       { fill: var(--accent); pointer-events: none; }

/* Highlighted node via search */
.node.highlighted circle { stroke: var(--accent); stroke-width: 3px; filter: drop-shadow(0 0 6px var(--accent)); }
.node.dimmed circle      { opacity: 0.2; }
.node.dimmed text        { opacity: 0.2; }
.link.dimmed             { opacity: 0.1; }

#info-title { color: var(--accent); margin-top: 0; font-size: 1.2rem; }
#ai-status  { color: var(--accent); }