*,
*::before,
*::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f3f3f7;
    color: #222;
}

body {
    display: flex;
    flex-direction: row;
}

/* ===== TOOLBAR ===== */

.toolbar {
    width: 260px;
    background: #020617;
    color: #e5e7eb;
    padding: 16px 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-shadow: 2px 0 10px rgba(15, 23, 42, 0.5);
    position: relative;
    z-index: 10;
}

.brand {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 12px;
}

.brand-main {
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: lowercase;
    font-size: 18px;
}

.brand-separator {
    opacity: 0.5;
}

.brand-variant {
    font-weight: 500;
    font-size: 15px;
    color: #38bdf8;
}

.toolbar-section-label {
    margin-top: 8px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #9ca3af;
}

.tool {
    padding: 6px 8px;
    margin-bottom: 4px;
    background: #0f172a;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    border: 1px solid transparent;
    display: inline-block;
    width: 200px;
}

.tool:hover {
    background: #1f2937;
    border-color: #334155;
}

.tool.active {
    border-color: #38bdf8;
    background: #0b1120;
}

button {
    padding: 6px 10px;
    margin-top: 4px;
    border-radius: 6px;
    border: none;
    background: #0ea5e9;
    color: white;
    cursor: pointer;
    font-size: 13px;
}

button.secondary {
    background: #111827;
    border: 1px solid #1f2937;
    color: #e5e7eb;
}

button:hover {
    filter: brightness(1.08);
}

/* ===== STAGE WRAPPER ===== */

.stage-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: radial-gradient(circle at top left, #e0f2fe 0, #f9fafb 45%, #e5e7eb 100%);
}

.stage-header {
    padding: 10px 16px;
    border-bottom: 1px solid rgba(148, 163, 184, 0.5);
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: rgba(248, 250, 252, 0.85);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 5;
}

.stage-title {
    font-weight: 600;
    font-size: 15px;
    color: #0f172a;
}

.stage-subtitle {
    font-size: 12px;
    color: #6b7280;
}

/* ===== STAGE ===== */

.stage {
    flex: 1;
    position: relative;
    overflow: auto;
    background-image:
        radial-gradient(circle at 0 0, rgba(148, 163, 184, 0.35) 0, transparent 55%),
        radial-gradient(circle at 100% 0, rgba(96, 165, 250, 0.35) 0, transparent 60%),
        radial-gradient(circle at 100% 100%, rgba(148, 163, 184, 0.35) 0, transparent 55%);
    background-color: #e5e7eb;
}

.stage-inner {
    position: relative;
    transform-origin: 0 0;
    width: 3000px;
    height: 2000px;
    background-image:
        linear-gradient(to right, rgba(148,163,184,0.2) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(148,163,184,0.2) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* ===== FORMAS BÁSICAS ===== */

.shape {
    position: absolute;
    min-width: 120px;
    min-height: 40px;
    padding: 6px 10px;
    background: #ffffff;
    border-radius: 4px;
    border: 1px solid #9ca3af;
    box-shadow: 0 1px 2px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    cursor: move;
    user-select: none;
}

.shape.rectangle {
    border-radius: 4px;
}

.shape.pill {
    border-radius: 999px;
}

.shape.circle {
    border-radius: 999px;
    width: 80px;
    height: 80px;
    padding: 0;
    justify-content: center;
}

/* Texto libre: solo texto, sin caja */
.shape.text {
    min-width: 20px;
    min-height: 20px;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    cursor: move;
}

/* Resalte opcional durante la edición de texto libre */
.shape.text[contenteditable="true"] {
    outline: 1px dashed #9ca3af;
}

/* ===== BASE DE DATOS (CILINDRO) ===== */

.shape.db {
    min-width: 120px;
    min-height: 60px;
    padding-top: 20px;
    border-radius: 60px / 16px;
    background: linear-gradient(180deg, #e5e7eb 0%, #ffffff 40%, #e5e7eb 100%);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.shape.db::before {
    content: "";
    position: absolute;
    top: 0;
    left: 48px;
    width: 19px;
    right: 8px;
    transform: scaleX(6);
    height: 18px;
    border-radius: 999px;
    border: 1px solid #9ca3af;
    background: radial-gradient(circle at 50% 30%,
            #ffffff 0,
            #e5e7eb 45%,
            #cbd5e1 80%,
            #9ca3af 100%);
}

.shape.db::after {
    content: "";
    position: absolute;
    bottom: -9px;
    left: 48px;
    width: 19px;
    right: 8px;
    transform: scaleX(6);
    height: 18px;
    border-radius: 999px;
    border: 1px solid #9ca3af;
    background: radial-gradient(circle at 50% 70%,
            #e5e7eb 0,
            #cbd5e1 55%,
            #94a3b8 100%);
}

/* ===== ENTIDAD ER ===== */

.shape.entity {
    min-width: 160px;
    min-height: 60px;
    padding: 0;
    background: #ffffff;
    border-radius: 4px;
    border: 1px solid #9ca3af;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.entity-header {
    padding: 6px 8px;
    font-weight: 600;
    border-bottom: 1px solid #e5e7eb;
    background: #f9fafb;
    cursor: text;
    font-size: 13px;
}

.entity-properties {
    padding: 4px 4px 0 4px;
}
.entity-property {
    display: grid;
    grid-template-columns: 14px 1fr 14px;
    align-items: center;
    column-gap: 4px;
    padding: 2px 0;
}
.entity-property .property-name {
    padding: 2px 4px;
    border-radius: 3px;
}

/* puertos */

.port {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    border: 1px solid #6b7280;
    background: #f9fafb;
    cursor: crosshair;
    justify-self: center;
}

.port:hover {
    background: #e5e7eb;
}

.entity-add-prop {
    border: none;
    border-top: 1px solid #e5e7eb;
    background: #f9fafb;
    padding: 4px 0;
    font-size: 12px;
    cursor: pointer;
}

.entity-add-prop:hover {
    background: #e5e7eb;
}

/* Selección */

.shape.selected,
.arrow.selected,
.ortho-arrow.selected {
    box-shadow: 0 0 0 2px #22d3ee;
    border-color: #0891b2;
}

/* ===== FLECHAS (ESTILO RECTO) ===== */

.arrow {
    position: absolute;
    height: 2px;
    background: #111827;
    transform-origin: 0 50%;
}

.arrow::after {
    content: "";
    position: absolute;
    right: -1px;
    top: 50%;
    width: 0;
    height: 0;
    border-left: 8px solid #111827;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    transform: translateY(-50%);
}

.arrow-double::before {
    content: "";
    position: absolute;
    left: -7px;
    top: 50%;
    width: 0;
    height: 0;
    border-right: 8px solid #111827;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    transform: translateY(-50%);
}

/* ===== FLECHAS ORTOGONALES ===== */

.ortho-arrow {
    position: absolute;
    pointer-events: none;
}

.ortho-arrow .segment {
    position: absolute;
    background: #111827;
}

.ortho-arrow.horizontal .segment {
    height: 2px;
}

.ortho-arrow.vertical .segment {
    width: 2px;
}

.ortho-arrowhead {
    position: absolute;
    width: 0;
    height: 0;
}

.ortho-arrowhead.dir-right {
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid #111827;
}
.ortho-arrowhead.dir-left {
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-right: 8px solid #111827;
}
.ortho-arrowhead.dir-down {
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 8px solid #111827;
}
.ortho-arrowhead.dir-up {
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 8px solid #111827;
}