/* ===== CSS RESET & VARIABLES ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --sidebar-width: 320px;
    --primary: #2C3E50;
    --accent: #E67E22;
    --accent-hover: #D35400;
    --bg: #F0F2F5;
    --panel-bg: #FFFFFF;
    --border: #DDE1E6;
    --text: #2C3E50;
    --text-sec: #7F8C8D;
    --danger: #E74C3C;
    --danger-hover: #C0392B;
    --success: #27AE60;
    --radius: 6px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ===== HEADER ===== */
.header {
    background: var(--primary);
    color: #fff;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    z-index: 10;
}
.header h1 { font-size: 18px; font-weight: 600; }
.header-actions { display: flex; gap: 8px; }

/* ===== LAYOUT ===== */
.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--panel-bg);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    flex-shrink: 0;
}

.panel {
    border-bottom: 1px solid var(--border);
}
.panel-header {
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-sec);
    background: #F8F9FA;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}
.panel-header:hover { background: #EEF0F2; }
.panel-header .arrow { transition: transform 0.2s; font-size: 10px; }
.panel-header .arrow.collapsed { transform: rotate(-90deg); }
.panel-body { padding: 12px 14px; }
.panel-body.collapsed { display: none; }

/* ===== FORM CONTROLS ===== */
.form-row {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    gap: 8px;
}
.form-row label {
    font-size: 12px;
    color: var(--text-sec);
    min-width: 90px;
    flex-shrink: 0;
}
.form-row input[type="number"],
.form-row input[type="text"],
.form-row select {
    flex: 1;
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    background: #fff;
    min-width: 0;
}
.form-row input[type="number"]:focus,
.form-row input[type="text"]:focus,
.form-row select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(230,126,34,0.15);
}
.form-row .unit {
    font-size: 11px;
    color: var(--text-sec);
    min-width: 25px;
}
.form-row-check {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}
.form-row-check input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
}
.form-row-check label {
    font-size: 13px;
    cursor: pointer;
}

/* ===== BUTTONS ===== */
.btn {
    padding: 6px 12px;
    border: none;
    border-radius: var(--radius);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}
.btn-outline:hover { background: #F0F0F0; }
.btn-sm { padding: 4px 8px; font-size: 11px; }
.btn-block { width: 100%; justify-content: center; }
.btn-pdf { background: var(--success); color: #fff; }
.btn-pdf:hover { background: #219A52; }
.btn:disabled,
.btn[disabled] {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

/* ===== PV PLATZIERUNG PANEL ===== */
.placement-row {
    display: flex;
    gap: 6px;
}
.placement-main {
    flex: 1;
    padding: 9px 12px;
    font-size: 13px;
    font-weight: 600;
    justify-content: center;
    box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}
.placement-main.active {
    background: #1976D2;
    color: #fff;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.25);
}
.placement-main.active:hover { background: #1565C0; }
.placement-icon {
    width: 38px;
    padding: 0;
    font-size: 18px;
    line-height: 1;
    justify-content: center;
    flex-shrink: 0;
}
.placement-tools {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-top: 8px;
}
.btn-tool {
    background: #ECEFF1;
    color: #37474F;
    padding: 8px 8px;
    font-size: 11px;
    font-weight: 600;
    border: 1px solid #CFD8DC;
    justify-content: center;
    text-align: center;
    line-height: 1.2;
}
.btn-tool:hover { background: #CFD8DC; }
.btn-tool.active {
    background: #1976D2;
    color: #fff;
    border-color: #1976D2;
}

/* ===== KABELBAUM PANEL ===== */
.kabelbaum-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-bottom: 10px;
}
.btn-kabelbaum {
    padding: 9px 10px;
    font-size: 12px;
    font-weight: 600;
    justify-content: center;
    border: 1px solid transparent;
    box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}
.btn-kabelbaum.kb-dacheintritt {
    background: #FFF176;
    color: #5D4037;
    border-color: #FBC02D;
}
.btn-kabelbaum.kb-dacheintritt:hover { background: #FFEE58; }
.btn-kabelbaum.kb-dacheintritt.active {
    background: #FBC02D;
    color: #3E2723;
    border-color: #F57F17;
}
.btn-kabelbaum.kb-kette {
    background: #7B1FA2;
    color: #fff;
    border-color: #6A1B9A;
}
.btn-kabelbaum.kb-kette:hover { background: #6A1B9A; }
.btn-kabelbaum.kb-kette.active {
    background: #4A148C;
    border-color: #4A148C;
}
#kettenList .kette-card {
    border: 1px solid #E0E0E0;
    border-left: 4px solid #7B1FA2;
    border-radius: 6px;
    padding: 8px 10px;
    margin-bottom: 6px;
    background: #fff;
    font-size: 12px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
#kettenList .kette-card.active {
    background: #F3E5F5;
    border-left-color: #4A148C;
}
#kettenList .kette-card .kette-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}
#kettenList .kette-card .kette-title {
    font-size: 13px;
    font-weight: 600;
    color: #4A148C;
}
#kettenList .kette-card .kette-meta {
    font-size: 11px;
    color: #555;
    line-height: 1.45;
}
#kettenList .kette-card .kette-warn {
    font-size: 11px;
    color: #C62828;
    font-weight: 600;
}
#kabelbaumList .leitungen-box {
    margin-top: 6px;
    border: 1px solid #E0E0E0;
    border-radius: 6px;
    overflow: hidden;
    background: #fff;
}
#kabelbaumList .leitungen-head {
    padding: 7px 10px;
    font-size: 12px;
    cursor: pointer;
    background: #F8F9FA;
    display: flex;
    align-items: center;
    gap: 6px;
    user-select: none;
    border-bottom: 1px solid #E0E0E0;
}
#kabelbaumList .leitungen-head:hover { background: #ECEFF1; }
#kabelbaumList .leitung-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 10px;
    font-size: 11px;
    border-bottom: 1px solid #F0F0F0;
}
#kabelbaumList .leitung-row:last-child { border-bottom: none; }

/* ===== LIST ITEMS ===== */
.list-item {
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.1s;
}
.list-item:hover { background: #F8F9FA; }
.list-item.active {
    border-color: var(--accent);
    background: #FDF2E9;
}
.list-item .item-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1;
}
.list-item .item-name { font-weight: 500; }
.list-item .item-detail { font-size: 11px; color: var(--text-sec); }
.list-item .item-actions { display: flex; gap: 4px; flex-shrink: 0; }
.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px 4px;
    font-size: 14px;
    color: var(--text-sec);
    border-radius: 3px;
}
.btn-icon:hover { background: #EEE; color: var(--text); }
.btn-icon.delete:hover { color: var(--danger); }
.btn-icon.lock { display: inline-flex; align-items: center; justify-content: center; }
.btn-icon.lock.active { color: var(--primary); }
.list-item.locked { background: #F0F4F8; border-color: var(--primary); opacity: 0.75; }
.list-item.locked .item-name { color: var(--text-sec); }

.empty-msg {
    font-size: 12px;
    color: var(--text-sec);
    text-align: center;
    padding: 10px 0;
    font-style: italic;
}

/* ===== MAIN AREA ===== */
.main-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: #E8E8E8;
}
.canvas-container canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* ===== TOOLBAR ===== */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 14px;
    background: var(--panel-bg);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}
.zoom-controls {
    display: flex;
    align-items: center;
    gap: 6px;
}
.zoom-controls .zoom-level {
    font-size: 12px;
    min-width: 50px;
    text-align: center;
    color: var(--text-sec);
}
.toolbar-info {
    font-size: 12px;
    color: var(--text-sec);
}

/* ===== RESULTS BAR ===== */
.results-bar {
    background: var(--primary);
    color: #fff;
    padding: 8px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    flex-wrap: wrap;
    gap: 6px 20px;
}
.result-item {
    font-size: 13px;
}
.result-item .count {
    font-weight: 700;
    color: var(--accent);
    font-size: 15px;
}
.result-total {
    font-size: 15px;
    font-weight: 700;
}
.result-total .count {
    color: #F1C40F;
    font-size: 18px;
}

/* ===== MODAL ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 100;
    justify-content: center;
    align-items: center;
}
.modal-overlay.show { display: flex; }
.modal {
    background: var(--panel-bg);
    border-radius: 10px;
    padding: 20px;
    min-width: 380px;
    max-width: 480px;
    width: 90%;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.modal.modal-large {
    max-width: 760px;
    max-height: 90vh;
    overflow-y: auto;
}
.modal h3 {
    font-size: 16px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}
.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

/* ===== SHAPE-SPECIFIC INPUTS ===== */
.shape-fields { display: none; }
.shape-fields.active { display: block; }

/* ===== CANVAS EMPTY STATE ===== */
.empty-state {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-sec);
    pointer-events: none;
}
.empty-state .icon { font-size: 48px; margin-bottom: 10px; }
.empty-state p { font-size: 14px; }

/* ===== PV MODE ===== */
.pv-mode-indicator {
    background: #27AE60;
    color: #fff;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 500;
}
.pv-warning {
    color: var(--danger);
    font-weight: bold;
    font-size: 12px;
}

/* ===== HISTORY SIDEBAR ===== */
.history-toggle {
    position: absolute;
    right: 240px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    width: 24px;
    height: 48px;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-right: none;
    border-radius: 6px 0 0 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--text-sec);
    padding: 0;
    transition: right 0.25s ease;
}
.history-toggle:hover {
    background: #eee;
}
.history-toggle.collapsed {
    right: 0;
}
.history-sidebar {
    width: 240px;
    min-width: 240px;
    background: var(--panel-bg);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width 0.25s ease, min-width 0.25s ease, opacity 0.25s ease;
    overflow: hidden;
}
.history-sidebar.collapsed {
    width: 0;
    min-width: 0;
    border-left: none;
    opacity: 0;
}
.history-header {
    padding: 10px 12px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-sec);
    background: #F8F9FA;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}
.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 6px;
}
.history-entry {
    padding: 6px 8px;
    border-radius: var(--radius);
    margin-bottom: 3px;
    font-size: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
    background: #F8F9FA;
    border: 1px solid transparent;
}
.history-entry.latest {
    border-color: var(--accent);
    background: #FDF2E9;
}
.history-desc {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.history-time {
    font-size: 10px;
    color: var(--text-sec);
    flex-shrink: 0;
}

/* ===== IMAGE TRACE OVERLAY ===== */
#imageTraceOverlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: #1e1e1e;
    z-index: 10001;
    flex-direction: column;
}
#itToolbar {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    background: #2a2a2a;
    border-bottom: 1px solid #444;
    gap: 12px;
    flex-shrink: 0;
}
#itPhaseLabel {
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
}
#itControls {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
}
#itInfo {
    padding: 6px 16px;
    font-size: 12px;
    color: #aaa;
    background: #252525;
    border-bottom: 1px solid #333;
    flex-shrink: 0;
}
#imageTraceCanvas {
    flex: 1;
    cursor: crosshair;
}
.it-label {
    color: #aaa;
    font-size: 12px;
}
.it-label strong {
    color: #fff;
}
.it-input {
    width: 80px;
    padding: 4px 6px;
    font-size: 13px;
    border: 1px solid #555;
    border-radius: 4px;
    background: #333;
    color: #fff;
}
.it-btn-sec {
    color: #ccc;
    border: 1px solid #666;
    background: transparent;
}